CN107291270B - Remote handwriting data transmission method and device - Google Patents
Remote handwriting data transmission method and device Download PDFInfo
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- CN107291270B CN107291270B CN201710320426.9A CN201710320426A CN107291270B CN 107291270 B CN107291270 B CN 107291270B CN 201710320426 A CN201710320426 A CN 201710320426A CN 107291270 B CN107291270 B CN 107291270B
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
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Abstract
The invention discloses a method and a device for transmitting remote handwriting data, wherein the method comprises the following steps: detecting handwriting input operation on a touch screen of first equipment, and acquiring a category identifier and a coordinate of a touch point at the current moment; when the touch point at the current moment is judged to be the moving touch point according to the category identification and the undetermined touch point in the undetermined state exists at the current moment, updating the state of the undetermined touch point according to the coordinates of the touch point at the current moment, the coordinates of the touch point in the previous effective state and the coordinates of the undetermined touch point; the state of the touch point is one of valid, pending or invalid; determining the state of the touch point at the current moment according to the coordinate of the touch point at the current moment and the coordinate of the touch point in the last effective state; and sequentially sending the touch points with the states changed into the effective states to a receiving end of the second equipment. The invention can reduce the data transmission amount during the remote handwriting transmission, save the network flow and improve the transmission accuracy.
Description
Technical Field
The invention relates to the technical field of data processing, in particular to a method and a device for transmitting remote handwriting data.
Background
The remote transmission of the handwriting data refers to that an acquisition end acquires handwriting data input by a user and transmits the handwriting data to a receiving end through a network. With the development of information technology, the application of handwriting data remote transmission is more and more extensive, for example, in the interactive display technology, a user performs handwriting input operation (such as writing characters or drawing graphics) on a touch screen of a local terminal, the local terminal acquires handwriting data input by the user, then transmits the handwriting data to a remote display terminal through a network, and then the remote display terminal displays corresponding handwriting content.
In the prior art, after the acquisition end acquires handwriting data input by a user, all the acquired handwriting data are often directly transmitted to the receiving end. However, the inventor of the present invention finds that the prior art has at least the following disadvantages in the process of implementing the present invention, that when the data volume of the handwriting data is large, a large amount of network traffic is consumed, which causes resource waste, and in addition, under the condition of a poor network state, a large transmission delay or even data loss may occur, which affects the normal work of the user, and the user experience is poor.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a method and a device for transmitting remote handwriting data, which can reduce the transmission amount during handwriting data transmission.
In order to solve the above technical problem, an embodiment of the present invention provides a method for transmitting remote handwriting data, including:
detecting handwriting input operation on a touch screen of first equipment, and acquiring a category identifier and a coordinate of a touch point at the current moment;
when the touch point at the current moment is judged to be a mobile touch point according to the category identification and an undetermined touch point in an undetermined state exists at the current moment, updating the state of the undetermined touch point according to the coordinates of the touch point at the current moment, the coordinates of the touch point in the last effective state and the coordinates of the undetermined touch point; the state of the touch point is one of an effective state, an undetermined state or an invalid state;
determining the state of the touch point at the current moment according to the coordinate of the touch point at the current moment and the coordinate of the touch point in the last effective state;
sequentially sending the touch points with the states changed into the effective states to a second equipment receiving end;
the updating the state of the to-be-determined touch point according to the coordinate of the touch point at the current moment, the coordinate of the touch point in the last effective state and the coordinate of the to-be-determined touch point specifically includes:
calculating a first distance from the touch point to be determined to the connecting line of the touch point at the current moment and the touch point at the last effective state according to the coordinate of the touch point at the current moment, the coordinate of the touch point at the last effective state and the coordinate of the touch point to be determined at the current moment and the coordinate of the touch point to be determined at the pending state;
updating the state of the to-be-determined touch point according to the first distance;
the determining the state of the touch point at the current time according to the coordinate of the touch point at the current time and the coordinate of the touch point at the last effective state specifically includes:
calculating a second distance from the touch point at the current moment to the touch point at the last effective state according to the coordinate of the touch point at the current moment and the coordinate of the touch point at the last effective state;
and determining the state of the touch point at the current moment according to the second distance.
Preferably, the transmission method further includes:
and when the touch point at the current moment is judged to be the mobile touch point according to the category identification and no undetermined touch point in an undetermined state exists at the current moment, determining the state of the touch point at the current moment according to the coordinates of the touch point at the current moment and the coordinates of the touch point in the previous effective state.
Preferably, the updating the state of the to-be-determined touch point according to the first distance specifically includes:
judging whether the first distance exceeds a preset first maximum discardable distance;
if so, updating the state of the to-be-determined touch point to be an effective state;
and if not, updating the state of the to-be-determined touch point to be an invalid state.
Preferably, the determining the state of the touch point at the current moment according to the second distance specifically includes:
judging whether the second distance exceeds a preset second maximum discardable distance;
if so, determining the state of the touch point at the current moment as an effective state;
and if not, determining the state of the touch point at the current moment as an undetermined state.
Preferably, the transmission method further includes:
when the touch point at the current moment is judged to be the initial touch point according to the category identification, determining the state of the touch point at the current moment to be an effective state;
when the touch point at the current moment is judged to be the termination touch point according to the category identification and an undetermined touch point in an undetermined state exists at the current moment, updating the state of the undetermined touch point according to the coordinate of the touch point at the current moment, the coordinate of the touch point in the last effective state and the coordinate of the undetermined touch point, and directly determining the state of the touch point at the current moment to be the effective state;
and when the touch point at the current moment is judged to be the termination touch point according to the category identification and no undetermined touch point in an undetermined state exists at the current moment, directly determining the state of the touch point at the current moment to be an effective state.
Correspondingly, the embodiment of the invention also provides a device for transmitting the remote handwriting data, which comprises the following components:
the touch point parameter acquisition module is used for detecting handwriting input operation on a touch screen of the first equipment and acquiring the category identification and the coordinate of the touch point at the current moment;
the first state processing module is used for updating the state of the touch point to be determined according to the coordinate of the touch point at the current moment, the coordinate of the touch point in the last effective state and the coordinate of the touch point to be determined when the touch point at the current moment is judged to be the mobile touch point according to the category identification and the touch point to be determined in the pending state exists at the current moment; the state of the touch point is one of an effective state, an undetermined state or an invalid state;
the second state processing module is used for determining the state of the touch point at the current moment according to the coordinate of the touch point at the current moment and the coordinate of the touch point in the last effective state; and the number of the first and second groups,
the touch point sending module is used for sequentially sending the touch points of which the states are changed into the effective states to the second equipment receiving end;
the first state processing module specifically includes:
the first distance calculation unit is used for calculating a first distance from the touch point to be determined to the connecting line of the touch point at the current moment and the touch point at the last effective state according to the coordinate of the touch point at the current moment, the coordinate of the touch point at the last effective state and the coordinate of the touch point to be determined at the current moment and the coordinate of the touch point to be determined at the pending state; and the number of the first and second groups,
the first distance judgment unit is used for updating the state of the to-be-determined touch point according to the first distance;
the second state processing module specifically includes:
the second distance calculation unit is used for calculating a second distance from the touch point at the current moment to the touch point at the last effective state according to the coordinate of the touch point at the current moment and the coordinate of the touch point at the last effective state; and the number of the first and second groups,
and the second distance judging unit is used for determining the state of the touch point at the current moment according to the second distance.
Preferably, the transmission device further includes:
and the third state processing module is used for determining the state of the touch point at the current moment according to the coordinates of the touch point at the current moment and the coordinates of the touch point in the previous effective state when the touch point at the current moment is judged to be the mobile touch point according to the category identification and no undetermined touch point in an undetermined state exists at the current moment.
Preferably, the first distance determination unit is specifically configured to:
judging whether the first distance exceeds a preset first maximum discardable distance; and the number of the first and second electrodes,
when the first distance exceeds a preset first maximum discardable distance, updating the state of the touch point to be determined into an effective state;
and when the first distance does not exceed a preset first maximum discardable distance, updating the state of the touch point to be determined into an invalid state.
Preferably, the second distance determination unit is specifically configured to:
judging whether the second distance exceeds a preset second maximum discardable distance; and the number of the first and second electrodes,
when the second distance exceeds a preset second maximum discardable distance, determining the state of the touch point at the current moment as an effective state;
and when the second distance does not exceed a preset second maximum discardable distance, determining the state of the touch point at the current moment as a pending state.
Preferably, the transmission device further includes:
the fourth state processing module is used for determining the state of the touch point at the current moment as an effective state when the touch point at the current moment is judged to be the initial touch point according to the category identification;
a fifth state processing module, configured to, when it is determined that the touch point at the current time is the termination touch point according to the category identifier and there is an undetermined touch point in an undetermined state at the current time, update the state of the undetermined touch point according to the coordinate of the touch point at the current time, the coordinate of the touch point in the last valid state, and the coordinate of the undetermined touch point, and directly determine the state of the touch point at the current time as the valid state; and the number of the first and second groups,
and the sixth state processing module is used for directly determining the state of the touch point at the current moment as an effective state when the touch point at the current moment is judged to be the termination touch point according to the category identification and no undetermined touch point in an undetermined state exists at the current moment.
The embodiment of the invention has the following beneficial effects:
according to the method and the device for transmitting the remote handwriting data, provided by the embodiment of the invention, the state of the touch point to be determined is updated to be valid or invalid according to the coordinate of the touch point at the current moment, the coordinate of the touch point in the last valid state and the coordinate of the touch point to be determined at the current moment, the state of the touch point at the current moment is determined to be valid or pending according to the coordinate of the touch point at the current moment and the coordinate of the touch point in the last valid state, and only the touch point with the state changed into the valid state is sent to the receiving end of the second equipment without sending the touch point with the invalid state. Therefore, the embodiment of the invention can reduce the data transmission amount during the remote handwriting transmission, thereby saving the network flow and improving the transmission accuracy.
Drawings
FIG. 1 is a flow chart illustrating a method for transmitting remote handwriting data according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a position relationship between a last touch point in an active state, a pending touch point in a pending state at a current time, and a touch point at the current time;
FIG. 3 is a schematic structural diagram of an embodiment of a device for transmitting remote handwriting data according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Please refer to fig. 1, which is a flowchart illustrating an embodiment of a method for transmitting remote handwriting data according to the present invention.
The method for transmitting remote handwriting data provided by the embodiment can be executed by a processor of a first device, and at least comprises the following steps:
s11, detecting handwriting input operation on the touch screen of the first device, and acquiring the category identification and the coordinates of the touch point at the current moment;
it should be noted that, in practical application, the first device (i.e., the acquisition end) acquires handwriting data input by a user, and transmits the corresponding handwriting data to the receiving end (i.e., the receiving end) of the second device through the network, so as to complete remote transmission of the handwriting data. In specific implementation, when the first device is in the handwriting input mode, a user can perform handwriting input operation by touching and moving a touch screen of the first device with a writing tool (such as a finger or a specific writing pen).
In the embodiment of the invention, when the first device is in a handwriting input mode, the first device detects the handwriting input condition on the touch screen of the first device in real time, and acquires the category identification and the coordinate of the corresponding touch point in real time when detecting that the handwriting input operation exists. The category identification of the touch point is used for distinguishing the category of the touch point, that is, the category identification of one touch point can be used for knowing whether the touch point is a starting touch point, a moving touch point or an ending touch point of one handwriting input operation. In one handwriting input operation, a corresponding touch point when a user firstly contacts the touch screen is a starting touch point, namely a pen-down point, a corresponding touch point when the user lifts off the touch screen is an ending touch point, namely a pen-up point, and other touch points except the starting touch point and the ending touch point are moving touch points in the handwriting input process. In a specific implementation, a byte array may be used to represent the related information of a touch point, where the data of the first byte of the array is the category identifier of the touch point, for example, when the touch point is the initial touch point, the first node of the array is set to '0', when the touch point is the moving touch point, the first node of the array is set to '1', and when the touch point is the ending touch point, the first node of the array is set to '2'. In addition, the coordinates of the touch point are position information of the touch point on the touch screen of the first device, and are represented by (X, Y).
S12, when the touch point at the current moment is judged to be the mobile touch point according to the category identification and an undetermined touch point in an undetermined state exists at the current moment, updating the state of the undetermined touch point according to the coordinate of the touch point at the current moment, the coordinate of the touch point in the last effective state and the coordinate of the undetermined touch point; the state of the touch point is one of an effective state, an undetermined state or an invalid state;
in the embodiment of the invention, if the state of one touch point is an effective state, the touch point is a key point in the handwriting input process, and if the input handwriting received by the second equipment receiving end is required to be only different from the input handwriting collected by the first equipment within an error allowable range, the touch point needs to be sent to the second equipment receiving end; if the state of one touch point is in an undetermined state, the touch point is determined to be a key point in the handwriting input process according to the current existing touch point condition, so that the touch point cannot be sent to a second equipment receiving end or discarded temporarily, and the touch point in the undetermined state needs to be waited to determine whether to be updated to be in an effective state or an invalid state; if the state of one touch point is an invalid state, it means that even if the touch point can be discarded, that is, even if the touch point is not sent to the second device receiving end, the input handwriting received by the second device receiving end only has a difference within an error allowable range from the input handwriting collected by the first device.
In the embodiment of the present invention, at each time, there is only one or none pending touch point in a pending state, however, there may be a plurality of touch points in an active state, where the last touch point in the active state refers to the touch point whose time determined as the active state is closest to the current time.
S13, determining the state of the touch point at the current moment according to the coordinate of the touch point at the current moment and the coordinate of the touch point in the last effective state;
it should be noted that, when a user performs a handwriting input operation, the input handwriting is composed of a plurality of touch points, and the relative position between the touch points determines the shape of the handwriting. Therefore, the state of the touch point to be determined is updated according to the coordinate of the touch point at the current moment, the coordinate of the touch point in the last valid state and the coordinate of the touch point to be determined, and the state of the touch point at the current moment is determined according to the coordinate of the touch point at the current moment and the coordinate of the touch point in the last valid state. In addition, since the handwriting input operation is sequential, the step S12 is performed before the step S13.
And S14, sequentially sending the touch points with the valid states to the receiving end of the second device.
It should be noted that the handwriting input operations are in sequence, and therefore, in the embodiment of the present invention, the touch point that is first changed into the valid state is first sent to the second device receiving end, and then the touch point that is changed into the valid state is sent to the second device receiving end. For example, at the current time, the acquisition time of the undetermined touch point in the undetermined state is earlier than the newly acquired touch point at the current time, so that the state of the undetermined touch point is updated first, then the state of the touch point at the current time is determined, and if the state of the undetermined touch point and the state of the touch point at the current time are both changed into effective states, the undetermined touch point is firstly sent to the receiving end of the second device, and then the touch point at the current time is sent to the receiving end of the second device. In addition, the embodiment of the present invention transmits only the touch point whose state is changed to the valid state to the second device receiving end, performs a discarding operation for the touch point whose state is the invalid state, and transmits only the touch points whose states are valid states, which have not been transmitted before, that is, each touch point whose state is the valid state is transmitted only once.
It should be noted that, the step S14 may be executed in synchronization with the steps S12 and S13, that is, once the state of the touch point to be determined is updated to the valid state, the touch point updated to the valid state is immediately sent to the second device receiving end, and once the state of the touch point at the current time is determined to be the valid state, the touch point determined to be the valid state is immediately sent to the second device receiving end, so as to ensure the efficiency of data transmission, and synchronize the handwriting data of the first device and the second device receiving end.
It should be noted that the second device receiving end may be a display terminal, and after receiving the touch point, the second device receiving end may display corresponding handwriting content according to the touch point. In addition, the second device receiving end can also be a server, and can perform electronic signature recognition and the like according to the received touch point.
The method for transmitting the remote handwriting data updates the state of the touch point to be determined to be valid or invalid according to the coordinate of the touch point at the current moment, the coordinate of the touch point in the valid state at the last moment and the coordinate of the touch point to be determined in the pending state at the current moment, determines the state of the touch point at the current moment to be valid or pending according to the coordinate of the touch point at the current moment and the coordinate of the touch point in the valid state at the last moment, and only transmits the touch point with the state changed into the valid state to the receiving end of the second equipment without transmitting the touch point with the invalid state. Therefore, the invention can reduce the data transmission amount during the remote handwriting transmission, thereby saving the network flow and improving the transmission accuracy.
In a preferred embodiment, the transmission method further includes:
and when the touch point at the current moment is judged to be the mobile touch point according to the category identification and no undetermined touch point in an undetermined state exists at the current moment, determining the state of the touch point at the current moment according to the coordinates of the touch point at the current moment and the coordinates of the touch point in the previous effective state.
It should be noted that at a certain time in the process of handwriting input, there may not be a pending touch point in a pending state. Therefore, in the present embodiment, after determining that the touch point at the current time is the moving touch point based on the category identifier, it is determined whether there is a pending touch point in a pending state at the current time, and if there is a pending touch point in the current time, the above steps S12 and S13 are executed, and if not, the state of the touch point at the current time only needs to be determined based on the coordinates of the touch point at the current time and the coordinates of the touch point in the previous valid state.
In a preferred embodiment, the updating the state of the touch point to be determined according to the coordinate of the touch point at the current time, the coordinate of the touch point in the last valid state, and the coordinate of the touch point to be determined specifically includes:
calculating a first distance from the touch point to be determined to the connecting line of the touch point at the current moment and the touch point at the last effective state according to the coordinate of the touch point at the current moment, the coordinate of the touch point at the last effective state and the coordinate of the touch point to be determined at the current moment and the coordinate of the touch point to be determined at the pending state;
judging whether the first distance exceeds a preset first maximum discardable distance;
if so, updating the state of the to-be-determined touch point to be an effective state;
and if not, updating the state of the to-be-determined touch point to be an invalid state.
In this embodiment, after obtaining the coordinates of the touch point at the current time, the coordinates of the touch point in the previous valid state, and the coordinates of the undetermined touch point at the current time in the undetermined state, the distance between the touch point at the current time and the connection line between the touch point at the undetermined touch point and the touch point in the previous valid state, that is, the first distance, may be obtained through calculation according to the point-to-line distance calculation formula. And then, judging whether the first distance exceeds a preset first maximum discardable distance, if the first distance exceeds the preset first maximum discardable distance, indicating that if the undetermined touch point is discarded, a handwriting shape formed by the last touch point in the valid state, the undetermined touch point and the touch point at the current moment is greatly different from a handwriting shape formed by the last touch point in the valid state and the touch point at the current moment, namely the handwriting shape exceeds an error allowable range, so that in this case, the undetermined touch point cannot be discarded, and the state of the undetermined touch point needs to be updated to be the valid state to be sent to a second equipment receiving end, so as to ensure the reliability of the handwriting data. On the contrary, if the first distance does not exceed the preset first maximum discardable distance, it indicates that even if the state of the undetermined touch point is updated to an invalid state and is not sent to the second device receiving end, the input handwriting received by the second device receiving end only has a small difference from the input handwriting collected by the first device, that is, the difference within the error allowable range, and therefore, the state of the undetermined touch point can be updated to the invalid state and is not sent to the second device receiving end, so as to reduce the data transmission amount. For example, referring to fig. 2, if the last touch point in the valid state is a, the touch point to be determined is B, and the touch point at the current time is C, it can be seen that a second distance from B to a connection line between a and C is larger, at this time, if the point B is discarded, a larger difference exists between the shape ABC of the input trace acquired by the first device and the shape AC of the input trace received by the receiving end of the second device, and therefore, the point B cannot be discarded, and the state of the point B should be updated to the valid state and sent to the receiving end of the second device. However, if the last touch point in the valid state is a, the pending touch point is B ', and the touch point at the current time is C, it can be seen that the second distance from B ' to the connection line between a and C is small, at this time, if the point B ' is discarded, the shape A B ' C of the input handwriting collected by the first device and the shape AC of the input handwriting received by the second device receiving end will not have a large difference, and therefore, the state of the point B ' can be updated to the invalid state and is not sent to the second device receiving end.
In this embodiment, the first maximum discardable distance is preset by the user according to the actual situation, and the setting is to ensure that the shape of the input handwriting collected by the first device is as similar as possible to the shape of the input handwriting received by the receiving end of the second device, that is, the two devices only have a difference within an error tolerance range. In addition, the resolution of the receiving end of the second device will affect the value of the first maximum discardable distance.
In a preferred embodiment, the determining the state of the touch point at the current time according to the coordinates of the touch point at the current time and the coordinates of the touch point in the last valid state specifically includes:
calculating a second distance from the touch point at the current moment to the touch point at the last effective state according to the coordinate of the touch point at the current moment and the coordinate of the touch point at the last effective state;
judging whether the second distance exceeds a preset second maximum discardable distance;
if so, determining the state of the touch point at the current moment as an effective state;
and if not, determining the state of the touch point at the current moment as an undetermined state.
In this embodiment, the coordinates of the touch point at the current time and the coordinates of the touch point in the last valid state are obtained, and the distance from the touch point at the current time to the touch point in the last valid state, that is, the second distance, can be calculated according to the point-to-point distance calculation formula. And then, judging whether the second distance exceeds a preset second maximum discardable distance, if the second distance exceeds the preset second maximum discardable distance, it indicates that if the touch point at the current moment is discarded, the shape of the input handwriting collected by the first device and the shape of the input handwriting received by the receiving end of the second device may have a larger difference, that is, a difference exceeding an error allowable range, so that, under such a condition, the touch point at the current moment cannot be discarded, and the state of the touch point needs to be determined to be an effective state to be sent to the receiving end of the second device, so as to ensure the reliability of the handwriting data. On the contrary, if the second distance does not exceed the preset second maximum discardable distance, it indicates that even if the state of the touch point at the current time is determined to be an invalid state and is not sent to the second device receiving end, the input handwriting received by the second device receiving end only has a small difference from the input handwriting collected by the first device, that is, a difference within an error allowable range, and therefore, the state of the touch point at the current time can be updated to be the invalid state and is not sent to the second device receiving end, so as to reduce the data transmission amount.
In this embodiment, the second maximum discardable distance is preset by the user according to the actual situation, and the setting is to ensure that the shape of the input handwriting collected by the first device is as similar as possible to the shape of the input handwriting received by the receiving end of the second device, that is, the two devices only have a difference within an error allowable range. In addition, the resolution of the receiving end of the second device will affect the value of the second maximum discardable distance.
In a preferred embodiment, the transmission method further includes:
when the touch point at the current moment is judged to be the initial touch point according to the category identification, determining the state of the touch point at the current moment to be an effective state;
when the touch point at the current moment is judged to be the termination touch point according to the category identification and an undetermined touch point in an undetermined state exists at the current moment, updating the state of the undetermined touch point according to the coordinate of the touch point at the current moment, the coordinate of the touch point in the last effective state and the coordinate of the undetermined touch point, and directly determining the state of the touch point at the current moment to be the effective state;
and when the touch point at the current moment is judged to be the termination touch point according to the category identification and no undetermined touch point in an undetermined state exists at the current moment, directly determining the state of the touch point at the current moment to be an effective state.
It should be noted that two special points, namely, the initial touch point and the ending touch point, must exist in one handwriting input operation. These two points are key points for determining the shape of the input handwriting, and therefore, after acquiring the category identification and the coordinates of the touch point at the current time, whether the touch point at the current moment is an initial touch point or a termination touch point can be judged according to the touch point category identification, if the touch point is the initial touch point, directly determining the state of the touch point at the current moment as an effective state, if the touch point is terminated, further judging whether the undetermined touch point in the undetermined state exists at the current moment, if so, updating the state of the touch point to be determined according to the coordinate of the touch point at the current moment, the coordinate of the touch point in the last effective state and the coordinate of the touch point to be determined, and directly determining the state of the touch point at the current moment as an effective state, and if the state of the touch point does not exist, directly determining the state of the touch point at the current moment as an effective state.
In addition, the method for transmitting the remote handwriting data provided by the invention has another embodiment. The method for transmitting remote handwriting data provided by the embodiment at least comprises the following steps:
detecting handwriting input operation on a touch screen, and acquiring a category identifier and a coordinate of a touch point at the current moment;
judging whether the touch point at the current moment is an initial touch point or not according to the category identification of the touch point at the current moment;
if the touch point at the current moment is the initial touch point, directly determining the state of the touch point at the current moment as an effective state;
if the touch point at the current moment is not the initial touch point, further judging whether the touch point at the current moment is an ending touch point;
if the touch point at the current moment is not the termination touch point (namely, the mobile touch point is explained), further judging whether an undetermined touch point in an undetermined state exists at the current moment;
if the touch point at the current moment is not the termination touch point and the undetermined touch point exists at the current moment, calculating a first distance from the undetermined touch point to a connecting line of the touch point at the current moment and the touch point at the last effective state according to the coordinate of the touch point at the current moment, the coordinate of the touch point at the last effective state and the coordinate of the undetermined touch point, and judging whether the first distance exceeds a preset first maximum discardable distance;
if the first distance exceeds a preset first maximum discardable distance, updating the state of the touch point to be determined into an effective state;
if the first distance does not exceed the preset first maximum discardable distance, updating the state of the touch point to be determined into an invalid state;
calculating a second distance from the touch point at the current moment to the touch point at the last effective state according to the coordinate of the touch point at the current moment and the coordinate of the touch point at the last effective state, and judging whether the second distance exceeds a preset second maximum discardable distance;
if the second distance exceeds a preset second maximum discardable distance, determining the state of the touch point at the current moment as an effective state;
if the second distance does not exceed a preset second maximum discardable distance, determining the state of the touch point at the current moment as an undetermined state;
if the touch point at the current moment is not the termination touch point and the undetermined touch point does not exist at the current moment, calculating a second distance from the touch point at the current moment to the touch point at the last effective state according to the coordinate of the touch point at the current moment and the coordinate of the touch point at the last effective state, and judging whether the second distance exceeds a preset second maximum discardable distance;
if the second distance exceeds a preset second maximum discardable distance, determining the state of the touch point at the current moment as an effective state;
if the second distance does not exceed a preset second maximum discardable distance, determining the state of the touch point at the current moment as an undetermined state;
if the touch point at the current moment is a termination touch point, further judging whether the touch point to be determined exists at the current moment;
if the touch point at the current moment is a termination touch point and an undetermined touch point in an undetermined state exists at the current moment, calculating a first distance from the undetermined touch point to a connecting line between the touch point at the current moment and the touch point in the previous effective state according to the coordinate of the touch point at the current moment, the coordinate of the touch point in the previous effective state and the coordinate of the undetermined touch point, and judging whether the first distance exceeds a preset first maximum discardable distance;
if the first distance exceeds a preset first maximum discardable distance, updating the state of the touch point to be determined into an effective state;
if the first distance does not exceed a preset first maximum discardable distance, updating the state of the touch point to be determined into an invalid state;
and if the touch point at the current moment is a termination touch point and no undetermined touch point in an undetermined state exists at the current moment, directly determining the state of the touch point at the current moment as an effective state.
And then, taking the preset first maximum discardable distance as 20 and the preset second maximum discardable distance as 5, and in the process of inputting handwriting once, sequentially acquiring touch points as follows: the following describes the processing method of note data provided in this embodiment in detail, taking the cases of down (100 ), move1(110, 103), move2(115, 100), move3(150, 100), move4(160, 110), and up (170, 100) as examples.
When the touch point down (100 ) is acquired, the touch point is judged to be an initial touch point according to the type identification of the touch point, so that the state of the touch point down (100 ) is directly determined to be an effective state, and the touch point down (100 ) is sent to a second equipment receiving end;
when the touch point move1(110, 103) is acquired, the touch point is judged to be a mobile touch point according to the type identification of the touch point, no undetermined touch point in an undetermined state at the current moment is detected, the first distance between the touch point move1(110, 103) and the touch point down (100 ) in the last effective state is calculated to be 10.44, the first distance is judged to be smaller than a preset first maximum discardable distance 20, and therefore the state of the touch point move1(110, 103) is determined to be in an undetermined state;
when a touch point move2(115, 100) is acquired, the touch point is judged to be a mobile touch point according to the category identification of the touch point, and a pending touch point move1(110, 103) in a pending state is detected to exist at the current moment, then a second distance from the pending touch point move1(110, 103) to the connecting line of the last touch point down (100 ) in an effective state and the touch point move2(115, 100) acquired at the current moment is calculated to be 3, the second distance is judged to be less than a preset second maximum discardable distance 5, and then the state of the pending touch point move1(110, 103) is updated to be an invalid state; then, calculating a first distance between the touch point move2(115, 100) obtained at the current moment and the previous touch point down (100 ) in the valid state, wherein the first distance is 15, and judging that the first distance is smaller than a preset first maximum discardable distance 20, so that the state of the touch point move2(115, 100) is determined to be in an undetermined state;
when a touch point move3(150, 100) is acquired, the touch point is judged to be a moving touch point according to the category identification of the touch point, and a pending touch point move2(115, 100) in a pending state is detected to exist at the current moment, then a second distance from the pending touch point move2(115, 100) to the connecting line of the last touch point down (100 ) in an effective state and the touch point move3(150, 100) obtained at the current moment is calculated to be 0, the second distance is judged to be smaller than a preset second maximum discardable distance 5, and then the state of the pending touch point move1(110, 103) is updated to be an invalid state; then, calculating a first distance between the touch point move3(150, 100) obtained at the current moment and the previous touch point down (100 ) in the valid state, calculating to obtain the first distance as 50, and judging that the first distance is greater than a preset first maximum discardable distance 20, so that the state of the touch point move3(150, 100) is determined to be the valid state, and the touch point move3(150, 100) is sent to the receiving end of the second device; when the touch point move4(160, 110) is acquired, the touch point is judged to be a mobile touch point according to the category identification of the touch point, no pending touch point in a pending state exists at the current moment, a first distance between the touch point move4(160, 110) acquired at the current moment and the last touch point move3(150, 100) in an effective state is calculated, the first distance is 14.14, and the first distance is judged to be smaller than a preset first maximum discardable distance 20, so that the state of the touch point move4(160, 110) is determined to be in a pending state;
when a touch point up (170, 100) is acquired, the touch point is judged to be a termination touch point according to the type identification of the touch point, and a pending touch point move4(160, 110) in a pending state at the current moment is detected, then a second distance from the pending touch point move4(160, 110) to the last touch point move3(150, 100) in an effective state and a connecting line of the touch point up (170, 100) obtained at the current moment is calculated to be 10, the second distance is judged to be greater than a preset second maximum discardable distance 5, then the state of the pending touch point move4(160, 110) is updated to be in an effective state, and the touch point move4(160, 110) is sent to a second equipment receiving end; and determining the state of the touch point up (170, 100) obtained at the current moment as an effective state, and sending the touch point up (170, 100) to a receiving end of the second equipment, so that the handwriting data transmission work of the handwriting input operation is finished.
According to the method for transmitting the remote handwriting data, the state of the touch point to be determined is updated to be valid or invalid according to the coordinate of the touch point at the current moment, the coordinate of the touch point in the previous valid state and the coordinate of the touch point to be determined in the current pending state, the state of the touch point at the current moment is determined to be valid or pending according to the coordinate of the touch point at the current moment and the coordinate of the touch point in the previous valid state, and only the touch point with the state changed into the valid state is sent to the receiving end of the second device without sending the touch point with the invalid state. Therefore, the invention can reduce the data transmission amount during the remote handwriting transmission, thereby saving the network flow and improving the transmission accuracy.
Correspondingly, the embodiment of the invention also provides a device for transmitting the remote handwriting data, which can realize all the processes in the method for transmitting the remote handwriting data provided by the embodiment of the invention.
Please refer to fig. 3, which is a schematic structural diagram of an embodiment of a device for transmitting remote handwriting data according to the present invention. The transmission device of the remote handwriting data provided by the embodiment of the invention comprises:
the touch point parameter acquiring module 11 is configured to detect a handwriting input operation on a touch screen of the first device, and acquire a category identifier and a coordinate of a touch point at a current time;
the first state processing module 12 is configured to, when it is determined that the touch point at the current time is a moving touch point according to the category identifier and there is an undetermined touch point in an undetermined state at the current time, update the state of the undetermined touch point according to the coordinate of the touch point at the current time, the coordinate of the touch point in the previous valid state, and the coordinate of the undetermined touch point; the state of the touch point is one of an effective state, an undetermined state or an invalid state;
the second state processing module 13 is configured to determine the state of the touch point at the current time according to the coordinate of the touch point at the current time and the coordinate of the touch point in the last valid state; and the number of the first and second groups,
and a touch point sending module 14, configured to send the touch points whose states are changed into valid states to the second device receiving end in sequence.
The remote handwriting data transmission device updates the state of the touch point to be determined to be valid or invalid according to the coordinate of the touch point at the current moment, the coordinate of the touch point in the previous valid state and the coordinate of the touch point to be determined in the current pending state, determines the state of the touch point at the current moment to be valid or pending according to the coordinate of the touch point at the current moment and the coordinate of the touch point in the previous valid state, and only sends the touch point with the state changed into the valid state to the receiving end of the second device without sending the touch point with the invalid state. Therefore, the invention can reduce the data transmission amount during the remote handwriting transmission, thereby saving the network flow and improving the transmission accuracy.
In a preferred embodiment, the transmission device further comprises:
and the third state processing module is used for determining the state of the touch point at the current moment according to the coordinates of the touch point at the current moment and the coordinates of the touch point in the previous effective state when the touch point at the current moment is judged to be the mobile touch point according to the category identification and no undetermined touch point in an undetermined state exists at the current moment.
In a preferred embodiment, the first state processing module 12 specifically includes:
the first distance calculation unit is used for calculating a first distance from the touch point to be determined to the connecting line of the touch point at the current moment and the touch point at the last effective state according to the coordinate of the touch point at the current moment, the coordinate of the touch point at the last effective state and the coordinate of the touch point to be determined at the current moment and the coordinate of the touch point to be determined at the pending state; and the number of the first and second groups,
a first distance judgment unit, configured to judge whether the first distance exceeds a preset first maximum discardable distance; and the number of the first and second electrodes,
when the first distance exceeds a preset first maximum discardable distance, updating the state of the touch point to be determined into an effective state;
and when the first distance does not exceed a preset first maximum discardable distance, updating the state of the touch point to be determined into an invalid state.
In a preferred embodiment, the second state processing module 13 specifically includes:
the second distance calculation unit is used for calculating a second distance from the touch point at the current moment to the touch point at the last effective state according to the coordinate of the touch point at the current moment and the coordinate of the touch point at the last effective state; and the number of the first and second groups,
a second distance determination unit configured to determine whether the second distance exceeds a preset second maximum discardable distance; and the number of the first and second electrodes,
when the second distance exceeds a preset second maximum discardable distance, determining the state of the touch point at the current moment as an effective state;
and when the second distance does not exceed a preset second maximum discardable distance, determining the state of the touch point at the current moment as a pending state.
In a preferred embodiment, the transmission device further comprises:
the fourth state processing module is used for determining the state of the touch point at the current moment as an effective state when the touch point at the current moment is judged to be the initial touch point according to the category identification;
a fifth state processing module, configured to, when it is determined that the touch point at the current time is the termination touch point according to the category identifier and there is an undetermined touch point in an undetermined state at the current time, update the state of the undetermined touch point according to the coordinate of the touch point at the current time, the coordinate of the touch point in the last valid state, and the coordinate of the undetermined touch point, and directly determine the state of the touch point at the current time as the valid state; and the number of the first and second groups,
and the sixth state processing module is used for directly determining the state of the touch point at the current moment as an effective state when the touch point at the current moment is judged to be the termination touch point according to the category identification and no undetermined touch point in an undetermined state exists at the current moment.
According to the method and the device for transmitting the remote handwriting data, the state of the touch point to be determined is updated to be valid or invalid according to the coordinate of the touch point at the current moment, the coordinate of the touch point in the last valid state and the coordinate of the touch point to be determined in the last pending state at the current moment, the state of the touch point at the current moment is determined to be valid or pending according to the coordinate of the touch point at the current moment and the coordinate of the touch point in the last valid state, only the touch point with the state changed into the valid state is sent to the receiving end of the second equipment, and the touch point with the state changed into the invalid state does not need to be sent. Therefore, the invention can reduce the data transmission amount during the remote handwriting transmission, thereby saving the network flow and improving the transmission accuracy. The foregoing is directed to the preferred embodiment of the present invention, and it is understood that various changes and modifications may be made by one skilled in the art without departing from the spirit of the invention, and it is intended that such changes and modifications be considered as within the scope of the invention.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
Claims (10)
1. A method for transmitting remote handwriting data, comprising:
detecting handwriting input operation on a touch screen of first equipment, and acquiring a category identifier and a coordinate of a touch point at the current moment;
when the touch point at the current moment is judged to be a mobile touch point according to the category identification and an undetermined touch point in an undetermined state exists at the current moment, updating the state of the undetermined touch point according to the coordinates of the touch point at the current moment, the coordinates of the touch point in the last effective state and the coordinates of the undetermined touch point; the state of the touch point is one of an effective state, an undetermined state or an invalid state;
determining the state of the touch point at the current moment according to the coordinate of the touch point at the current moment and the coordinate of the touch point in the last effective state;
sequentially sending the touch points with the states changed into the effective states to a second equipment receiving end;
the updating the state of the to-be-determined touch point according to the coordinate of the touch point at the current moment, the coordinate of the touch point in the last effective state and the coordinate of the to-be-determined touch point specifically includes:
calculating a first distance from the touch point to be determined to the connecting line of the touch point at the current moment and the touch point at the last effective state according to the coordinate of the touch point at the current moment, the coordinate of the touch point at the last effective state and the coordinate of the touch point to be determined at the current moment and the coordinate of the touch point to be determined at the pending state;
updating the state of the to-be-determined touch point according to the first distance;
the determining the state of the touch point at the current time according to the coordinate of the touch point at the current time and the coordinate of the touch point at the last effective state specifically includes:
calculating a second distance from the touch point at the current moment to the touch point at the last effective state according to the coordinate of the touch point at the current moment and the coordinate of the touch point at the last effective state;
and determining the state of the touch point at the current moment according to the second distance.
2. A method of transmitting remote handwriting data according to claim 1, said method of transmitting further comprising:
and when the touch point at the current moment is judged to be the mobile touch point according to the category identification and no undetermined touch point in an undetermined state exists at the current moment, determining the state of the touch point at the current moment according to the coordinates of the touch point at the current moment and the coordinates of the touch point in the previous effective state.
3. The method for transmitting remote handwriting data according to claim 1, wherein updating the state of the point to be touched according to the first distance specifically comprises:
judging whether the first distance exceeds a preset first maximum discardable distance;
if so, updating the state of the to-be-determined touch point to be an effective state;
and if not, updating the state of the to-be-determined touch point to be an invalid state.
4. The method for transmitting remote handwriting data according to claim 1, wherein the determining the state of the touch point at the current time according to the second distance specifically comprises:
judging whether the second distance exceeds a preset second maximum discardable distance;
if so, determining the state of the touch point at the current moment as an effective state;
and if not, determining the state of the touch point at the current moment as an undetermined state.
5. A method of transmitting remote handwriting data according to any of claims 1 to 4, said method of transmitting further comprising:
when the touch point at the current moment is judged to be the initial touch point according to the category identification, determining the state of the touch point at the current moment to be an effective state;
when the touch point at the current moment is judged to be the termination touch point according to the category identification and an undetermined touch point in an undetermined state exists at the current moment, updating the state of the undetermined touch point according to the coordinate of the touch point at the current moment, the coordinate of the touch point in the last effective state and the coordinate of the undetermined touch point, and directly determining the state of the touch point at the current moment to be the effective state;
and when the touch point at the current moment is judged to be the termination touch point according to the category identification and no undetermined touch point in an undetermined state exists at the current moment, directly determining the state of the touch point at the current moment to be an effective state.
6. A device for transmitting remote handwriting data, comprising:
the touch point parameter acquisition module is used for detecting handwriting input operation on a touch screen of the first equipment and acquiring the category identification and the coordinate of the touch point at the current moment;
the first state processing module is used for updating the state of the touch point to be determined according to the coordinate of the touch point at the current moment, the coordinate of the touch point in the last effective state and the coordinate of the touch point to be determined when the touch point at the current moment is judged to be the mobile touch point according to the category identification and the touch point to be determined in the pending state exists at the current moment; the state of the touch point is one of an effective state, an undetermined state or an invalid state;
the second state processing module is used for determining the state of the touch point at the current moment according to the coordinate of the touch point at the current moment and the coordinate of the touch point in the last effective state; and the number of the first and second groups,
the touch point sending module is used for sequentially sending the touch points of which the states are changed into the effective states to the second equipment receiving end;
the first state processing module specifically includes:
the first distance calculation unit is used for calculating a first distance from the touch point to be determined to the connecting line of the touch point at the current moment and the touch point at the last effective state according to the coordinate of the touch point at the current moment, the coordinate of the touch point at the last effective state and the coordinate of the touch point to be determined at the current moment and the coordinate of the touch point to be determined at the pending state; and the number of the first and second groups,
the first distance judgment unit is used for updating the state of the to-be-determined touch point according to the first distance;
the second state processing module specifically includes:
the second distance calculation unit is used for calculating a second distance from the touch point at the current moment to the touch point at the last effective state according to the coordinate of the touch point at the current moment and the coordinate of the touch point at the last effective state; and the number of the first and second groups,
and the second distance judging unit is used for determining the state of the touch point at the current moment according to the second distance.
7. Apparatus for transmission of remote handwriting data according to claim 6 and also comprising:
and the third state processing module is used for determining the state of the touch point at the current moment according to the coordinates of the touch point at the current moment and the coordinates of the touch point in the previous effective state when the touch point at the current moment is judged to be the mobile touch point according to the category identification and no undetermined touch point in an undetermined state exists at the current moment.
8. The apparatus for transmitting remote handwriting data according to claim 6, wherein said first distance determining unit is specifically configured to:
judging whether the first distance exceeds a preset first maximum discardable distance; and the number of the first and second electrodes,
when the first distance exceeds a preset first maximum discardable distance, updating the state of the touch point to be determined into an effective state;
and when the first distance does not exceed a preset first maximum discardable distance, updating the state of the touch point to be determined into an invalid state.
9. The apparatus for transmitting remote handwriting data according to claim 6, wherein said second distance determining unit is specifically configured to:
judging whether the second distance exceeds a preset second maximum discardable distance; and the number of the first and second electrodes,
when the second distance exceeds a preset second maximum discardable distance, determining the state of the touch point at the current moment as an effective state;
and when the second distance does not exceed a preset second maximum discardable distance, determining the state of the touch point at the current moment as a pending state.
10. Apparatus for transmission of remote handwriting data according to any of claims 6 to 9 and also comprising:
the fourth state processing module is used for determining the state of the touch point at the current moment as an effective state when the touch point at the current moment is judged to be the initial touch point according to the category identification;
a fifth state processing module, configured to, when it is determined that the touch point at the current time is the termination touch point according to the category identifier and there is an undetermined touch point in an undetermined state at the current time, update the state of the undetermined touch point according to the coordinate of the touch point at the current time, the coordinate of the touch point in the last valid state, and the coordinate of the undetermined touch point, and directly determine the state of the touch point at the current time as the valid state; and the number of the first and second groups,
and the sixth state processing module is used for directly determining the state of the touch point at the current moment as an effective state when the touch point at the current moment is judged to be the termination touch point according to the category identification and no undetermined touch point in an undetermined state exists at the current moment.
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| CN112783346A (en) * | 2021-01-19 | 2021-05-11 | 深圳市皓丽智能科技有限公司 | Handwriting data processing method and system, computer equipment and storage medium |
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