CN107390988B - Erasing method and device for electronic whiteboard - Google Patents
Erasing method and device for electronic whiteboard Download PDFInfo
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- CN107390988B CN107390988B CN201710565699.XA CN201710565699A CN107390988B CN 107390988 B CN107390988 B CN 107390988B CN 201710565699 A CN201710565699 A CN 201710565699A CN 107390988 B CN107390988 B CN 107390988B
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- G—PHYSICS
- 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
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0484—Interaction techniques based on graphical user interfaces [GUI] for the control of specific functions or operations, e.g. selecting or manipulating an object, an image or a displayed text element, setting a parameter value or selecting a range
- G06F3/04842—Selection of displayed objects or displayed text elements
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- G—PHYSICS
- 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
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0484—Interaction techniques based on graphical user interfaces [GUI] for the control of specific functions or operations, e.g. selecting or manipulating an object, an image or a displayed text element, setting a parameter value or selecting a range
- G06F3/04847—Interaction techniques to control parameter settings, e.g. interaction with sliders or dials
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- G—PHYSICS
- 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
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
- G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures
Abstract
The invention discloses an erasing method and device of an electronic whiteboard, wherein the erasing method of the electronic whiteboard comprises the following steps: displaying a control icon on the electronic whiteboard according to a first touch operation; adjusting the size of the selected mark in the erasing area on the electronic whiteboard according to the second touch operation on the control icon; the erasing area selected mark is generated and displayed on the electronic whiteboard when responding to the first touch operation or the second touch operation; and erasing all elements in the selected mark of the erasing area according to a third touch operation. The method can effectively solve the defects of energy consumption and time consumption of the existing erasing method of the electronic whiteboard, is convenient and quick, and saves time consumption and physical strength.
Description
Technical Field
The invention relates to the field of computers, in particular to an erasing method and device of an electronic whiteboard.
Background
The electronic whiteboard is a digital teaching demonstration device for replacing the traditional blackboard and chalks. The electronic whiteboard can be completely separated from a mouse and a keyboard, and the operations of editing, annotating, saving and the like of computer files are realized on the electronic whiteboard by using fingers or specific pens, so that great convenience is brought to users.
The existing erasing method of the electronic whiteboard mainly depends on erasing in a designated area by a user. Due to the nature of the configured eraser, the user needs to erase back and forth in the same area to completely clear the obsolete elements. On the other hand, when the area to be erased is too large, the user is also required to move the position to perform the erasing. Therefore, the existing erasing method brings inconvenience to users, has the defects of energy consumption and time consumption, and is not beneficial to intellectualization and high efficiency of the modern society.
Disclosure of Invention
The embodiment of the invention aims to provide an erasing method and device of an electronic whiteboard and a region selection method of the electronic whiteboard, which can effectively overcome the defects of energy consumption and time consumption of the existing erasing method of the electronic whiteboard, can quickly delete all elements in a required region, and is convenient and quick.
In order to achieve the above object, an embodiment of the present invention provides an erasing method for an electronic whiteboard, including:
displaying a control icon on the electronic whiteboard according to a first touch operation;
adjusting the size of the selected mark in the erasing area on the electronic whiteboard according to the second touch operation on the control icon; the erasing area selected mark is generated and displayed on the electronic whiteboard when responding to the first touch operation or the second touch operation;
and erasing all elements in the selected mark of the erasing area according to a third touch operation.
Compared with the prior art, the erasing method of the electronic whiteboard disclosed by the invention has the advantages that the control icon is displayed on the electronic whiteboard according to the first touch operation on the electronic whiteboard, the size of the selected mark of the erasing area is adjusted on the electronic whiteboard according to the second touch operation on the control icon, wherein the selected mark of the erasing area is generated and displayed on the electronic whiteboard when responding to the first touch operation or the second touch operation, then all elements in the selected mark of the erasing area are erased according to the third touch operation, and the elements in the required area can be deleted only by adjusting the size of the selected mark of the erasing area, so that the defects of energy consumption and time consumption of the existing erasing method of the electronic whiteboard can be effectively solved, and the erasing method is convenient and fast.
As an improvement of the above scheme, the control icon is a square icon, and the selected identifier of the erasing area is a square identifier; or the control icon is a circular icon, and the selected mark of the erasing area is a circular mark. The patterns of the control icons are correspondingly arranged according to the practicability of operation, and the selected marks of the erasing areas are determined by the distribution characteristics of the elements to be erased, so that the control icons are flexible.
As an improvement of the above solution, the control icon is located in an area covered by the erasure area selection indicator.
As an improvement of the above scheme, the control icon is a circular wheel disc, and the selected mark in the erasing area is a semitransparent circular mark; the adjusting the size of the selected mark of the erasing area on the electronic whiteboard according to the second touch operation on the control icon specifically comprises:
adjusting the circular semitransparent mark to expand outwards by taking the control icon as a center according to the rotation operation in the first direction on the circular wheel disc;
and adjusting the circular semitransparent mark to contract inwards by taking the control icon as a center according to the rotation operation in the second direction on the circular wheel disc.
The size of the round semitransparent mark is controlled through the rotating operation of the round wheel disc, so that the method is simple and controllable, and high in practicability.
As an improvement of the above scheme, the first direction is a clockwise direction, and the second direction is a counterclockwise direction; or, the first direction is a counterclockwise direction, and the second direction is a clockwise direction.
As an improvement of the above scheme, the adjusting of outward expansion of the circular translucent logo specifically includes:
controlling the radius of the round semitransparent mark to be in a direct proportion relation with the angle of the rotating operation in the first direction; wherein, the coefficient of the proportional relation is preset;
the adjusting inward contraction of the round semitransparent mark specifically comprises the following steps:
controlling the radius of the round semitransparent mark and the angle of the rotating operation in the second direction to be in an inverse proportion relation; wherein the coefficient of the inverse relation is preset. Through the linear relation between the rotating angle and the circular semitransparent mark, the circular semitransparent mark covering the area to be erased has higher controllability and is easy to operate.
As an improvement of the above scheme, the erasing all elements in the selected identifier of the erasing area according to the third touch operation specifically includes:
when the fact that the time for stopping executing the second touch operation is larger than a preset threshold value is detected, acquiring coordinates of occupied spaces of all elements in the electronic whiteboard;
and erasing the elements of which the coordinates of the occupied space are positioned in the selected mark of the erasing area. The erasing time point is controlled by the preset time threshold, so that the method is more in line with the habituation of people in operation, and the condition of mistaken deletion is avoided.
As an improvement of the above scheme, the control icon is a square icon, and the selected mark of the erasing area is a semitransparent square mark; the adjusting the size of the selected mark of the erasing area on the electronic whiteboard according to the second touch operation on the control icon specifically comprises:
adjusting the square semitransparent mark to expand or contract upwards by taking the control icon as a boundary condition according to the upwards sliding operation on the control icon;
adjusting the square semitransparent mark to expand or contract downwards by taking the control icon as a boundary condition according to downward sliding operation on the control icon;
adjusting the square semitransparent mark to expand or contract leftwards by taking the control icon as a boundary condition according to the leftward sliding operation on the control icon;
adjusting the square semitransparent mark to expand or contract rightwards by taking the control icon as a boundary condition according to the rightward stroke operation on the control icon;
adjusting the square semitransparent mark to expand or contract upwards leftwards by taking the control icon as a boundary condition according to the operation of sliding upwards and leftwards on the control icon;
adjusting the square semitransparent mark to expand or contract upwards and rightwards by taking the control icon as a boundary condition according to the upwards and rightwards sliding operation on the control icon;
adjusting the square semitransparent mark to expand or contract leftwards and downwards by taking the control icon as a boundary condition according to the left-down sliding operation on the control icon;
and adjusting the square semitransparent mark to expand or contract towards the right and downwards by taking the control icon as a boundary condition according to the right and downwards sliding operation on the control icon. The square semitransparent mark is expanded or contracted in the same direction according to the scratching operation direction, a touch point of the control icon does not need to be positioned and approximately located in the middle area of the area to be deleted, even if the control icon is located on one side of the area to be deleted, the covering operation of the area to be deleted can be completed, and the method has practicability.
As an improvement of the above scheme, the control icon is a square icon, and the selected mark of the erasing area is a semitransparent square mark; the adjusting the size of the selected mark of the erasing area on the electronic whiteboard according to the second touch operation on the control icon specifically comprises:
adjusting the square semitransparent mark to expand or contract in the left direction and the right direction by taking the control icon as a center according to the leftward or rightward stroke operation on the control icon;
adjusting the square semitransparent mark to expand or contract in two directions of upward and downward by taking the control icon as a center according to upward or downward sliding operation on the control icon;
and adjusting the square semitransparent mark to expand or contract upwards, downwards, leftwards and rightwards by taking the control icon as a center according to the upper left, lower left, upper right or lower right sliding operation on the control icon. The square semitransparent mark is expanded or contracted in two or more directions according to the stroke operation direction, so that the area to be deleted can be quickly covered.
An embodiment of the present invention further provides an erasing apparatus for an electronic whiteboard, including:
the control icon display module is used for displaying control icons on the electronic whiteboard according to a first touch operation;
the erasing area selected identifier adjusting module is used for adjusting the size of the erasing area selected identifier on the electronic whiteboard according to the second touch operation on the control icon; the erasing area selected mark is generated and displayed on the electronic whiteboard when responding to the first touch operation or the second touch operation;
and the erasing module is used for erasing all elements in the selected identifier of the erasing area according to the third touch operation.
Compared with the prior art, the erasing device of the electronic whiteboard disclosed by the invention has the advantages that the control icon is displayed on the electronic whiteboard through the control icon display module according to the first touch operation on the electronic whiteboard, and the size of the selected mark of the erasing area is adjusted on the electronic whiteboard through the erasing area selected mark adjusting module according to the second touch operation on the control icon; the erasing area selected mark is generated and displayed on the electronic whiteboard when responding to the first touch operation or the second touch operation, then all elements in the erasing area selected mark are erased through the erasing module according to the third touch operation, and the elements in the required area can be deleted only by adjusting the size of the erasing area selected mark.
The embodiment of the present invention further provides a storage medium, where the storage medium includes a stored program, and when the program runs, the device on which the storage medium is located is controlled to execute any one of the above erasing methods for an electronic whiteboard.
The embodiment of the invention also provides a terminal, which comprises one or more processors; a memory; a display device; and
one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the programs comprising instructions for performing the method of erasing an electronic whiteboard of any of the above.
The embodiment of the invention also provides a region selection method of the electronic whiteboard, which comprises the following steps:
displaying a control icon on the electronic whiteboard according to a first touch operation;
adjusting the size of the selected area identification on the electronic whiteboard according to the second touch operation on the control icon; and the area selection mark is generated and displayed on the electronic whiteboard when responding to the first touch operation or the second touch operation.
Compared with the prior art, the area selection method of the electronic whiteboard disclosed by the invention can display the control icon on the electronic whiteboard according to the first touch operation, and adjust the size of the area selection mark on the electronic whiteboard according to the second touch operation on the control icon; the area selection mark is generated and displayed on the electronic whiteboard when responding to the first touch operation or the second touch operation, so that the designated area of the electronic whiteboard can be quickly selected, and subsequent erasing or other operations are facilitated.
The embodiment of the invention also provides a storage medium, which comprises a stored program, wherein when the program runs, the device where the storage medium is located is controlled to execute the area selection method of the electronic whiteboard.
The embodiment of the invention also provides a terminal, which comprises one or more processors; a memory; a display device; and
one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the programs comprising instructions for performing the method of region selection for an electronic whiteboard described above.
Drawings
Fig. 1 is a schematic flow chart of an erasing method of an electronic whiteboard in embodiment 1 of the present invention.
Fig. 2 is a schematic flowchart of an erasing method of an electronic whiteboard in embodiment 2 of the present invention.
Fig. 3 is a flowchart illustrating step S2 in embodiment 3 of the present invention.
Fig. 4 is a schematic view of the process of rotating operation and corresponding expansion or contraction of the round translucent logo in embodiment 3 of the present invention.
Fig. 5 is another flowchart of step S2 in embodiment 4 of the present invention.
Fig. 6 is a schematic diagram of the process of the stroke operation and the corresponding expansion or contraction of the square translucent logo in embodiment 4 of the present invention.
Fig. 7 is another flowchart of step S2 in embodiment 5 of the present invention.
Fig. 8 is a schematic structural diagram of an erasing apparatus of an electronic whiteboard in embodiment 6 of 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.
Referring to fig. 1, a schematic flow chart of an erasing method of an electronic whiteboard according to embodiment 1 of the present invention includes:
s1, displaying a control icon on the electronic whiteboard according to the first touch operation;
the control icons are square icons or round icons, and the control icons are displayed at a first preset position on the electronic whiteboard. In addition, the first preset position may correspond to a position of the first touch operation, and may also be located at another position in the electronic whiteboard.
S2, adjusting the size of the selected mark in the erasing area on the electronic whiteboard according to the second touch operation on the control icon; the erasing area selected mark is generated and displayed on the electronic whiteboard when responding to the first touch operation or the second touch operation;
in this step, the size of the selected mark in the erasing area needs to be adjusted on the electronic whiteboard according to a second touch operation in response to the second touch operation on the control icon. In addition, the erasure area selection indicator can be displayed at a second preset position. When the control icon is a square icon, the selected erasing area identifier is a square identifier correspondingly; when the control icon is a circular icon, the selected erasing area identifier is a corresponding circular identifier. The selected marker of the erasing area is preferably in a state of being provided with a border and without filling or in a state of being provided with the border and semi-transparent filling.
And S3, erasing all elements in the selected erasure area identifier according to a third touch operation.
Preferably, the third touch operation may stop executing the second touch operation or stop touching the electronic whiteboard.
In specific implementation, a control icon is displayed on the electronic whiteboard according to a first touch operation on the electronic whiteboard, then the size of an erasing area selection mark is adjusted on the electronic whiteboard according to a second touch operation on the control icon, wherein the erasing area selection mark is generated and displayed on the electronic whiteboard when responding to the first touch operation or the second touch operation, then all elements in the erasing area selection mark are erased according to a third touch operation, and the elements in a required area can be deleted only by adjusting the size of the erasing area selection mark.
Because all the elements (handwriting and graphics) on the electronic whiteboard have respective occupied spaces, the occupied spaces are rectangles, each element is contained in the respective rectangle, and the space occupied by each element is the space occupied by the rectangle. Based on embodiment 1, as shown in fig. 2, step S3 specifically includes:
s31, when it is detected that the time for stopping executing the second touch operation is greater than a preset threshold value, acquiring coordinates of occupied spaces of all elements in the electronic whiteboard;
through the preset threshold, the situation that mistaken deletion occurs due to the fact that the second touch operation is stopped for a short time under non-definite deletion is avoided, and the situation is more suitable for an actual use scene.
And S32, erasing the elements of which the coordinates of the occupied space are positioned in the erasing area selected identifier.
The elements are deleted in the space occupying distinguishing mode, so that the method is quicker, the discarded elements can be completely deleted, and the time consumption is saved.
In a preferred embodiment, the control icon is a circular wheel, and the erasure area selection indicator is a semi-transparent circular indicator, and correspondingly, on the basis of embodiment 1, as shown in fig. 3, in step S2, in response to the second touch operation on the control icon, the adjusting the size of the erasure area selection indicator on the electronic whiteboard according to the second touch operation on the control icon specifically includes:
s21, adjusting the circular semitransparent mark to expand outwards by taking the control icon as a center according to the rotation operation in the first direction on the circular wheel disc;
wherein, the adjusting the outward expansion of the round translucent logo specifically comprises:
controlling the radius of the round semitransparent mark to be in a direct proportion relation with the rotating operation angle in the first direction or the rotating radian of the round wheel disc; wherein, the coefficient of the proportional relation is preset;
and S22, adjusting the circular semitransparent mark to contract inwards by taking the control icon as a center according to the rotation operation in the second direction on the circular wheel disc.
Wherein, the adjusting of the inward contraction of the round semitransparent mark specifically comprises:
controlling the radius of the round semitransparent mark and the angle of the rotating operation in the second direction or the rotating radian of the round wheel disc to be in an inverse proportion relation; wherein the coefficient of the inverse relation is preset.
Through the steps, the round semitransparent mark is enlarged or reduced in a rotary wheel disc mode, the interestingness of the electronic whiteboard in use is increased, the operation is easy, the area needing to be deleted can be quickly covered, and the purpose of deleting elements is achieved. In this embodiment, the semi-transparent identifier is adopted, so that on one hand, the position and the size of the deletion area can be favorably identified by a user, on the other hand, the specific content of the element to be deleted can be favorably seen by the user through the perspective effect, the position and the size of the deletion area can be more favorably adjusted, and the situation of mistaken deletion is avoided.
Preferably, the first direction is a clockwise direction and the second direction is a counterclockwise direction. As shown in fig. 4(1), when the circular wheel disc 1 is rotated clockwise, the circular translucent logo 2 is gradually enlarged around the circular wheel disc 1, and as shown in fig. 4(2), when the circular wheel disc 1 is rotated counterclockwise, the circular translucent logo 2 is gradually reduced around the circular wheel disc 1. In an actual use process, clicking operation can be performed on the middle area of the area needing to be deleted, so that the circular wheel disc can be generated, when the circular wheel disc is rotated clockwise, the range of the area to be erased is expanded, when the circular wheel disc is rotated anticlockwise, the area to be erased is reduced, and then, in response to third touch operation on the electronic whiteboard, the system erases all elements in the area to be erased. Through above-mentioned scheme, the user need not to carry out manual repetition and erases just can get rid of the element completely, also need not to consume too much physical power and reach the effect of erasing in order to cover whole region with the hand, only needs through the circular rim plate of control, can cover required region to just erase completely fast and abandon the element, practice thrift manpower and time, it is practical swift.
In another preferred embodiment, the first direction is counterclockwise and the second direction is clockwise.
In another preferred embodiment, the control icon is a square icon, and the selected identifier of the erasing area is a semi-transparent square identifier; as shown in fig. 5, on the basis of embodiment 1, the step S2 of adjusting the size of the selected erasure area identifier on the electronic whiteboard according to the second touch operation on the control icon specifically includes:
s21', adjusting the square semitransparent mark to expand or contract upwards by taking the control icon as a boundary condition according to the upwards sliding operation on the control icon;
s22', adjusting the square semitransparent mark to expand or contract downwards according to the downwards sliding operation on the control icon by taking the control icon as a boundary condition;
s23', responding to the leftward sliding operation on the control icon, and adjusting the square semitransparent mark to expand or contract leftward by taking the control icon as a boundary condition according to the leftward sliding operation;
s24', adjusting the square semitransparent mark to expand or contract rightwards by taking the control icon as a boundary condition according to the rightward sliding operation on the control icon;
s25', adjusting the square semitransparent mark to expand or contract upwards leftwards by taking the control icon as a boundary condition according to the upper left sliding operation on the control icon;
s26', adjusting the square semitransparent mark to expand or contract upwards and rightwards by taking the control icon as a boundary condition according to the upwards and rightwards sliding operation on the control icon;
s27', adjusting the square semitransparent mark to expand or contract leftwards and downwards by taking the control icon as a boundary condition according to the left-down sliding operation on the control icon;
s28', according to the right-down sliding operation on the control icon, the square semitransparent mark is adjusted to expand or contract towards the right and the lower direction by taking the control icon as a boundary condition.
The above steps are divided into eight directions, i.e., up, down, left, right, left up, left down, right up, and right down, based on the sliding direction of the control icon, and it can be understood that when the operation is performed in each direction, the square translucent logo completely covers the square icon, and the square icon is used as a boundary condition to expand or contract. Taking the upward and downward sliding operation as an example, as shown in fig. 6(1), the initial square semitransparent mark exceeds the square icon upwards, and when responding to the upward sliding operation, taking the control icon as a boundary condition, adjusting the upward expansion of the square semitransparent mark according to the upward sliding operation; as shown in fig. 6(2), when responding to the downward sliding operation, the square semitransparent mark is adjusted to shrink downward according to the downward sliding operation and by taking the control icon as a boundary condition.
In the above embodiment, the square translucent mark is enlarged or reduced in the same direction according to the direction of the stroke operation, in another embodiment, the square translucent mark is expanded or contracted in more than one direction, as shown in fig. 7, on the basis of embodiment 1, the step S2 of adjusting the size of the selected mark of the erasing area on the electronic whiteboard according to the second touch operation on the control icon is specifically:
s21', adjusting the square semitransparent mark to expand or contract in the left direction and the right direction by taking the control icon as a center according to the leftward or rightward stroke operation on the control icon;
s22', adjusting the square semitransparent mark to expand or contract in the upward direction and the downward direction by taking the control icon as the center according to the upward or downward sliding operation on the control icon;
and S23', adjusting the square semitransparent mark to expand or contract upwards, downwards, leftwards and rightwards by taking the control icon as a center according to the upper left, lower left, upper right or lower right sliding operation on the control icon.
Through the steps, the square semitransparent mark can be expanded and contracted in two directions or four directions by performing one-direction scratching operation, wherein the expansion and contraction are performed by taking the control icon as the center. Preferably, the parameters of expansion and contraction may be determined by a relative displacement of the stroke operation or by an absolute displacement of the stroke operation from the center of the control icon.
Referring to fig. 8, a schematic structural diagram of an erasing apparatus of an electronic whiteboard according to an embodiment of the present invention is shown, including:
a control icon display module 101, configured to display a control icon on the electronic whiteboard according to a first touch operation;
an erasing area selected identifier adjusting module 102, configured to adjust the size of the erasing area selected identifier on the electronic whiteboard according to a second touch operation on the control icon; the erasing area selected mark is generated and displayed on the electronic whiteboard when responding to the first touch operation or the second touch operation;
the control icon is a square icon, and the selected mark of the erasing area is a square mark; or the control icon is a circular icon, and the selected mark of the erasing area is a circular mark.
And the erasing module 103 is configured to erase all elements in the selected identifier of the erasing area according to a third touch operation.
Preferably, the control icon is located in an area covered by the erasing area selected identifier, the control icon is a circular wheel, the erasing area selected identifier is a semi-transparent circular identifier, and the erasing area selected identifier adjusting module 102 is specifically configured to:
adjusting the circular semitransparent mark to expand outwards by taking the control icon as a center according to the rotation operation in the first direction on the circular wheel disc;
and adjusting the circular semitransparent mark to contract inwards by taking the control icon as a center according to the rotation operation in the second direction on the circular wheel disc.
Wherein the first direction is clockwise and the second direction is counterclockwise; or, the first direction is a counterclockwise direction, and the second direction is a clockwise direction.
Wherein, the adjusting the outward expansion of the round translucent logo specifically comprises: controlling the radius of the round semitransparent mark to be in a direct proportion relation with the angle of the rotating operation in the first direction; wherein, the coefficient of the proportional relation is preset;
the adjusting inward contraction of the round semitransparent mark specifically comprises the following steps: controlling the radius of the round semitransparent mark and the angle of the rotating operation in the second direction to be in an inverse proportion relation; wherein the coefficient of the inverse relation is preset.
In another preferred embodiment, the control icon is located in an area covered by the selected erasure area identifier, the control icon is a square icon, and the selected erasure area identifier is a semi-transparent square identifier, and the selected erasure area identifier adjusting module 102 is specifically configured to:
adjusting the square semitransparent mark to expand or contract upwards by taking the control icon as a boundary condition according to the upwards sliding operation on the control icon;
adjusting the square semitransparent mark to expand or contract downwards by taking the control icon as a boundary condition according to downward sliding operation on the control icon;
adjusting the square semitransparent mark to expand or contract leftwards by taking the control icon as a boundary condition according to the leftward sliding operation on the control icon;
adjusting the square semitransparent mark to expand or contract rightwards by taking the control icon as a boundary condition according to the rightward stroke operation on the control icon;
adjusting the square semitransparent mark to expand or contract upwards leftwards by taking the control icon as a boundary condition according to the operation of sliding upwards and leftwards on the control icon;
adjusting the square semitransparent mark to expand or contract upwards and rightwards by taking the control icon as a boundary condition according to the upwards and rightwards sliding operation on the control icon;
adjusting the square semitransparent mark to expand or contract leftwards and downwards by taking the control icon as a boundary condition according to the left-down sliding operation on the control icon;
and adjusting the square semitransparent mark to expand or contract towards the right and downwards by taking the control icon as a boundary condition according to the right and downwards sliding operation on the control icon.
In another preferred embodiment, the control icon is located in an area covered by the selected erasing area identifier, the control icon is a square icon, and the selected erasing area identifier is a semi-transparent square identifier, and the selected erasing area identifier adjusting module 102 is specifically configured to:
the control icon is a square icon, and the selected mark in the erasing area is a semitransparent square mark; the step of responding to a second touch operation on the control icon, and adjusting the size of the selected mark in the erasing area on the electronic whiteboard according to the second touch operation specifically comprises:
adjusting the square semitransparent mark to expand or contract in the left direction and the right direction by taking the control icon as a center according to the leftward or rightward stroke operation on the control icon;
adjusting the square semitransparent mark to expand or contract in two directions of upward and downward by taking the control icon as a center according to upward or downward sliding operation on the control icon;
and adjusting the square semitransparent mark to expand or contract upwards, downwards, leftwards and rightwards by taking the control icon as a center according to the upper left, lower left, upper right or lower right sliding operation on the control icon.
In another preferred embodiment, the erasing module 103 is specifically configured to, when it is detected that the time for stopping executing the second touch operation is greater than a preset threshold, obtain coordinates of occupied spaces of all elements in the electronic whiteboard; and erasing the elements of which the coordinates of the occupied space are positioned in the selected mark of the erasing area.
For the specific work engineering of the erasing apparatus for an electronic whiteboard provided in the foregoing embodiment, reference may be made to the description of the erasing method for an electronic whiteboard, and details are not described herein again.
The embodiment of the present invention also provides a storage medium, where the storage medium includes a stored program, and when the program runs, the device where the storage medium is located is controlled to execute any one of the above erasing methods for an electronic whiteboard.
The embodiment of the invention also correspondingly provides a terminal, which comprises one or more processors; a memory; a display device; and
one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the programs comprising instructions for performing the method of erasing an electronic whiteboard of any of the above.
The embodiment of the invention also correspondingly provides a region selection method of the electronic whiteboard, which comprises the following steps:
displaying a control icon on the electronic whiteboard according to a first touch operation;
the control icons are square icons or round icons, and the control icons are displayed at a first preset position on the electronic whiteboard. In addition, the first preset position may correspond to the position of the first touch operation, or may be located at another position in the electronic whiteboard
Adjusting the size of the selected area identification on the electronic whiteboard according to the second touch operation on the control icon; and the area selection mark is generated and displayed on the electronic whiteboard when responding to the first touch operation or the second touch operation.
In this step, the size of the selected mark in the erasing area needs to be adjusted on the electronic whiteboard according to a second touch operation in response to the second touch operation on the control icon. In addition, the erasure area selection indicator can be displayed at a second preset position.
In specific implementation, a control icon is displayed on the electronic whiteboard according to a first touch operation, and the size of the area selection mark is adjusted on the electronic whiteboard according to a second touch operation on the control icon; the area selection mark is generated and displayed on the electronic whiteboard when responding to the first touch operation or the second touch operation, so that the designated area of the electronic whiteboard can be quickly selected, and subsequent erasing or other operations are facilitated.
The embodiment of the present invention also provides a storage medium, where the storage medium includes a stored program, and when the program runs, the device where the storage medium is located is controlled to execute the above method for selecting an area of an electronic whiteboard.
The embodiment of the invention also correspondingly provides a terminal, which comprises one or more processors; a memory; a display device; and
one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the programs comprising instructions for performing the above-described method of area selection for an electronic whiteboard.
In summary, the present invention discloses an erasing method and apparatus for an electronic whiteboard, a region selection method for an electronic whiteboard, a storage medium, and a terminal, in which a control icon is displayed on the electronic whiteboard according to a first touch operation on the electronic whiteboard, and then a size of an erasing region selection flag is adjusted on the electronic whiteboard according to a second touch operation on the control icon, wherein the erasing region selection flag is generated and displayed on the electronic whiteboard in response to the first touch operation or the second touch operation, and then all elements in the erasing region selection flag are erased according to a third touch operation, and only the size of the erasing region selection flag is adjusted to delete the elements in a desired region, thereby effectively solving the disadvantages of energy consumption and time consumption of the existing erasing method for an electronic whiteboard, and being convenient and fast.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. An erasing method of an electronic whiteboard is characterized by comprising the following steps:
displaying a control icon on the electronic whiteboard according to a first touch operation;
adjusting the size of the selected mark in the erasing area on the electronic whiteboard according to the second touch operation on the control icon; the erasing area selected mark is generated and displayed on the electronic whiteboard when responding to the first touch operation or the second touch operation; the control icon is positioned in an area covered by the erasing area selected mark, and the control icon is a circular wheel disc or a square icon;
erasing all elements in the selected identifier of the erasing area according to a third touch operation;
when the control icon is a circular wheel disc, the selected mark of the erasing area is a semitransparent circular mark; the adjusting the size of the selected mark of the erasing area on the electronic whiteboard according to the second touch operation on the control icon specifically comprises:
adjusting the circular semitransparent mark to expand outwards by taking the control icon as a center according to the rotation operation in the first direction on the circular wheel disc;
and adjusting the circular semitransparent mark to contract inwards by taking the control icon as a center according to the rotation operation in the second direction on the circular wheel disc.
2. The method of erasing an electronic whiteboard of claim 1, wherein when the control icon is a square icon, the erasing area selection mark is a square mark.
3. The method of erasing an electronic whiteboard of claim 1, wherein the first direction is a clockwise direction and the second direction is a counterclockwise direction; or, the first direction is a counterclockwise direction, and the second direction is a clockwise direction.
4. An erasing method of an electronic whiteboard according to claim 1 or 3, wherein the adjusting the outward expansion of the circular translucent logo is specifically:
controlling the radius of the round semitransparent mark to be in a direct proportion relation with the angle of the rotating operation in the first direction; wherein, the coefficient of the proportional relation is preset;
the adjusting inward contraction of the round semitransparent mark specifically comprises the following steps:
controlling the radius of the round semitransparent mark and the angle of the rotating operation in the second direction to be in an inverse proportion relation; wherein the coefficient of the inverse relation is preset.
5. The method for erasing the electronic whiteboard of claim 4, wherein the erasing all the elements in the selected identifier of the erasing area according to the third touch operation specifically comprises:
when the fact that the time for stopping executing the second touch operation is larger than a preset threshold value is detected, acquiring coordinates of occupied spaces of all elements in the electronic whiteboard;
and erasing the elements of which the coordinates of the occupied space are positioned in the selected mark of the erasing area.
6. The method of erasing an electronic whiteboard of claim 1, wherein when the control icon is a square icon, the erasing area selection mark is a semi-transparent square mark; the adjusting the size of the selected mark of the erasing area on the electronic whiteboard according to the second touch operation on the control icon specifically comprises:
adjusting the square semitransparent mark to expand or contract upwards by taking the control icon as a boundary condition according to the upwards sliding operation on the control icon;
adjusting the square semitransparent mark to expand or contract downwards by taking the control icon as a boundary condition according to downward sliding operation on the control icon;
adjusting the square semitransparent mark to expand or contract leftwards by taking the control icon as a boundary condition according to the leftward sliding operation on the control icon;
adjusting the square semitransparent mark to expand or contract rightwards by taking the control icon as a boundary condition according to the rightward stroke operation on the control icon;
adjusting the square semitransparent mark to expand or contract upwards leftwards by taking the control icon as a boundary condition according to the operation of sliding upwards and leftwards on the control icon;
adjusting the square semitransparent mark to expand or contract upwards and rightwards by taking the control icon as a boundary condition according to the upwards and rightwards sliding operation on the control icon;
adjusting the square semitransparent mark to expand or contract leftwards and downwards by taking the control icon as a boundary condition according to the left-down sliding operation on the control icon;
and adjusting the square semitransparent mark to expand or contract towards the right and downwards by taking the control icon as a boundary condition according to the right and downwards sliding operation on the control icon.
7. The method of erasing an electronic whiteboard of claim 1, wherein when the control icon is a square icon, the erasing area selection mark is a semi-transparent square mark; the adjusting the size of the selected mark of the erasing area on the electronic whiteboard according to the second touch operation on the control icon specifically comprises:
adjusting the square semitransparent mark to expand or contract in the left direction and the right direction by taking the control icon as a center according to the leftward or rightward stroke operation on the control icon;
adjusting the square semitransparent mark to expand or contract in two directions of upward and downward by taking the control icon as a center according to upward or downward sliding operation on the control icon;
and adjusting the square semitransparent mark to expand or contract upwards, downwards, leftwards and rightwards by taking the control icon as a center according to the upper left, lower left, upper right or lower right sliding operation on the control icon.
8. An erasing apparatus of an electronic whiteboard, comprising:
the control icon display module is used for displaying control icons on the electronic whiteboard according to a first touch operation;
the erasing area selected identifier adjusting module is used for adjusting the size of the erasing area selected identifier on the electronic whiteboard according to the second touch operation on the control icon; the erasing area selected mark is generated and displayed on the electronic whiteboard when responding to the first touch operation or the second touch operation;
the erasing module is used for erasing all elements in the erasing area selected identification according to a third touch operation;
the control icon is positioned in an area covered by the selected mark of the erasing area, and the control icon is a circular wheel disc or a square icon; when the control icon is a circular wheel disc, the erasing area selected identifier is a semi-transparent circular identifier, and the erasing area selected identifier adjusting module is specifically configured to:
adjusting the circular semitransparent mark to expand outwards by taking the control icon as a center according to the rotation operation in the first direction on the circular wheel disc;
and adjusting the circular semitransparent mark to contract inwards by taking the control icon as a center according to the rotation operation in the second direction on the circular wheel disc.
9. A storage medium, characterized in that the storage medium comprises a stored program, wherein when the program runs, a device where the storage medium is located is controlled to execute the erasing method of the electronic whiteboard according to any one of claims 1 to 7.
10. A terminal comprising one or more processors; a memory; a display device; and
one or more programs, wherein the one or more programs are stored in the memory and configured for execution by the one or more processors, the programs comprising instructions for performing the method of erasing an electronic whiteboard of any of claims 1 to 7.
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