CN110716678A - Local deletion method and processing system for display picture and display equipment - Google Patents
Local deletion method and processing system for display picture and display equipment Download PDFInfo
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- CN110716678A CN110716678A CN201910951406.0A CN201910951406A CN110716678A CN 110716678 A CN110716678 A CN 110716678A CN 201910951406 A CN201910951406 A CN 201910951406A CN 110716678 A CN110716678 A CN 110716678A
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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]
- G06F3/0481—Interaction techniques based on graphical user interfaces [GUI] based on specific properties of the displayed interaction object or a metaphor-based environment, e.g. interaction with desktop elements like windows or icons, or assisted by a cursor's changing behaviour or appearance
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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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T11/00—2D [Two Dimensional] image generation
- G06T11/80—Creating or modifying a manually drawn or painted image using a manual input device, e.g. mouse, light pen, direction keys on keyboard
Abstract
The invention discloses a local deletion method and a processing system of a display picture and display equipment. The local deletion method of the display screen comprises the following steps: step 1, detecting that any closed curve is input at any position of a display picture; step 2, judging whether a deleting instruction is input within a preset time: step 3, if yes, executing step 4; step 4, judging whether x/a is smaller than a first value, if so, executing a first action; wherein x is the distance between the area of the deletion instruction input and the geometric center of gravity of the closed curve; a is the average value of the distances from all points on the closed curve to the geometric center of gravity; the first action is to delete the partial picture and the closed curve inside the closed curve or delete the partial picture and the closed curve outside the closed curve. The technical scheme provided by the embodiment of the invention realizes convenient, accurate and personalized local deletion of the display picture.
Description
Technical Field
The embodiment of the invention relates to a local display screen deleting technology, in particular to a local deleting method and a processing system of a display screen and display equipment.
Background
With the continuous development of display technology, electronic blackboards are widely applied to various fields of social life, have the advantages of simple structure and convenience in cleaning, are more beneficial to human health compared with traditional blackboards, and are popular with users.
In the prior art, the electronic blackboard usually adopts a solid or virtual deletion key to delete the whole display picture, so that a local picture cannot be deleted, and the use experience of a user is reduced.
Disclosure of Invention
The invention provides a local deletion method and a processing system of a display picture and display equipment, which are used for realizing the local deletion of the display picture.
In a first aspect, an embodiment of the present invention provides a method for locally deleting a display screen, including the following steps:
step 1, detecting that any closed curve is input at any position of the display picture;
wherein x is the distance between the area input by the deleting instruction and the geometric center of gravity of the closed curve;
a is the average of the distances from all points on the closed curve to the geometric center of gravity;
the first action is to delete a partial picture in the closed curve and the closed curve, or delete a partial picture outside the closed curve and the closed curve.
Optionally, step 4 further includes:
if the x/a is judged to be larger than or equal to the first value and smaller than a second value, only deleting the closed curve;
wherein the second value is greater than the first value.
Optionally, step 4 further includes:
if the x/a is larger than or equal to the second value, executing a second action;
when the first action is deleting a local picture in the closed curve and the closed curve, the second action is deleting a local picture outside the closed curve and the closed curve;
and when the first action is deleting the local picture outside the closed curve and the closed curve, the second action is deleting the local picture inside the closed curve and the closed curve.
Optionally, step 3 further includes:
and if the deletion instruction is not input within the preset time or the non-deletion instruction is input within the preset time, the closed curve is reserved.
Optionally, the display screen includes a first region, a second region and a third region, the x/a in the first region is smaller than the first value, the x/a in the second region is greater than or equal to the first value and smaller than the second value, and the x/a in the third region is greater than or equal to the second value;
the first region, the second region and the third region are different in display color, gradation or transparency.
Optionally, before the executing the first action, the method further includes:
displaying a first action content selection menu bar;
and detecting a selection instruction input by a user, and determining the specific content of the first action according to the selection instruction.
Optionally, the displaying the first action content selection menu bar includes:
displaying the first action content selection menu bar on a closed point of the closed curve.
Optionally, the delete instruction includes a single line, a plurality of lines, a preset symbol, a combination of at least two of the above three elements, or a delete selection operation in a delete menu bar.
Optionally, the preset symbol includes a letter or a character.
Optionally, when the closed curve is input within the preset time, the display state of the closed curve is different from the display state of other graphics in the display screen, and preferably, the closed curve is different from at least one of the color, the transparency, the line thickness, and the line virtual-real state of other graphics in the display screen.
Optionally, the closed curve is a preset shape, and the preset shape includes an elliptical closed curve or a polygonal closed curve.
In a second aspect, an embodiment of the present invention further provides a system for processing partial deletion of a display screen, including:
the input identification module is used for detecting whether any closed curve input exists at any position of a display picture;
the instruction judging module is used for judging whether a deleting instruction is input within preset time when the input identifying module detects that any closed curve is input at any position of the display picture;
the position judgment module is used for judging whether x/a is smaller than a first value or not when the instruction judgment module judges that a deletion instruction is input within preset time, wherein x is the distance between an area input by the deletion instruction and the geometric center of gravity of the closed curve; a is the average of the distances from all points on the closed curve to the geometric center of gravity;
and the instruction execution module is used for executing a first action when the position judgment module judges that the x/a is smaller than a first value, wherein the first action is deleting a local picture in the closed curve and the closed curve or deleting a local picture outside the closed curve and the closed curve.
In a third aspect, an embodiment of the present invention further provides a display device, including the system for processing partial deletion of a display screen according to the second aspect.
Optionally, the display device is an electronic blackboard or a display.
Optionally, the display device is a VR/AR/MR display apparatus.
According to the technical scheme provided by the embodiment of the invention, after any closed curve is detected to be input at any position of the display picture, whether a deleting instruction is input within the preset time is judged, if yes, a first action is executed when x/a is judged to be smaller than a first value, wherein x is the distance between the area of the deleting instruction input and the geometric gravity center of the closed curve, a is the average value of the distances from all points on the closed curve to the geometric gravity center, and the first action is deleting the local picture and the closed curve in the closed curve or deleting the local picture and the closed curve outside the closed curve, so that the local deletion of the display picture which is convenient, accurate and personalized is realized. Compared with a setting mode that an entity or virtual deletion button is fixedly arranged at a fixed position of a display screen or a display device, when a deletion action is executed, the deletion button needs to be pressed by the set button after the area to be deleted is selected. Meanwhile, the method can be also applied to virtual display screens such as VR/AR/MR without a solid display screen.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 is a flowchart illustrating a method for deleting a local portion of a display according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a closed curve provided by an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of another closed curve provided in the present embodiment;
FIG. 4 is a schematic structural diagram of a system for processing partial deletion of a display according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given to a method and a system for deleting a part of a display screen, and a specific implementation, a structure, features and effects of a display device according to the present invention, with reference to the accompanying drawings and preferred embodiments.
The embodiment of the invention provides a local deletion method of a display picture, which comprises the following steps:
step 1, detecting that any closed curve is input at any position of the display picture;
wherein x is the distance between the area input by the deleting instruction and the geometric center of gravity of the closed curve;
a is the average of the distances from all points on the closed curve to the geometric center of gravity;
the first action is to delete a partial picture in the closed curve and the closed curve, or delete a partial picture outside the closed curve and the closed curve.
According to the technical scheme provided by the embodiment of the invention, after any closed curve is detected to be input at any position of the display picture, whether a deleting instruction is input within the preset time is judged, if yes, a first action is executed when x/a is judged to be smaller than a first value, wherein x is the distance between the area of the deleting instruction input and the geometric gravity center of the closed curve, a is the average value of the distances from all points on the closed curve to the geometric gravity center, and the first action is deleting the local picture and the closed curve in the closed curve or deleting the local picture and the closed curve outside the closed curve, so that the local deletion of the display picture which is convenient, accurate and personalized is realized.
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 obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other embodiments that depart from the specific details disclosed herein, and it will be recognized by those skilled in the art that the present invention may be practiced without these specific details.
Next, the present invention is described in detail with reference to the schematic drawings, and in the detailed description of the embodiments of the present invention, the schematic drawings showing the structure of the device are not partially enlarged in general scale for convenience of description, and the schematic drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and height should be included in the actual fabrication.
Fig. 1 is a flowchart illustrating a method for deleting a local portion of a display according to an embodiment of the present invention. The method for deleting the part of the display screen provided by the embodiment is simultaneously suitable for an entity display screen such as an electronic blackboard and a virtual display space such as a VR space. As shown in fig. 1, the method for locally deleting a display screen may specifically include the following steps:
step 1, inputting any closed curve at any position of a detected display picture.
It should be noted that, the embodiment does not limit the type of the closed curve and the input position, and all the closed curves input in the display screen are within the protection range of the embodiment, so as to reduce the difficulty of forming the closed curve by the user and enhance the performability of forming the closed curve.
It is noted that the "closed curve" protected by the present embodiment includes the following two curves: 1. a curve in which an intersection exists; 2. the intersection point does not exist, but the distance between the head and the tail is smaller than a preset distance value, or the ratio of the distance between the head and the tail to the total length of the curve is smaller than a preset ratio, wherein the preset distance value and the preset ratio are positive numbers defined by a user or preset by a designer. Exemplarily, fig. 2 is a schematic structural diagram of a closed curve provided by an embodiment of the present invention. In fig. 2, the curve has an intersection O, and can form a closed space U. Fig. 3 is a schematic structural diagram of another closed curve provided in this embodiment. The head S and the tail G of the curve in fig. 3 do not coincide, and the distance between the two is smaller than the preset distance value, and at this time, the closed curve in fig. 3 also belongs to the "closed curve" protected by the present embodiment. In summary, the "closed curve" in this embodiment is not a closed curve in the complete sense, and may be an approximate closed curve that is optimized according to algorithm judgment and allows a certain fault tolerance range, such as the second curve described above. The range of the closed curve is enlarged by introducing an algorithm, so that the operability of a user in implementation is improved, and the method is more humanized.
Alternatively, the closed curve may be formed by a user using a stylus or by a user gesture. For example, for an electronic blackboard, a pen point of a stylus pen is in contact with a display screen of the electronic blackboard, and various linear shapes displayed on the display screen are formed under the control of a user, and at the moment, a display surface of the display screen is a display picture; for the virtual display space, the user visually feels in a virtual space, and a track with a corresponding shape can be formed in the virtual space by swinging an arm holding the controller, at the moment, the virtual space in the user visual feeling is the display picture.
It should be further noted that, when the display screen is the main operation area of the user and the closed curve is adopted to select the local screen to be deleted, the user does not need to move to the deletion key farther away from the current operation area to execute the deletion operation in the process of inputting the screen content, and only needs to form any closed curve at the position closer to the current operation area, so that the user experience is effectively improved.
And 2, judging whether a deleting instruction is input within the preset time.
It should be noted that the preset time can be reasonably set by the user according to actual needs, and it can be understood that, in order to avoid that the local deletion action of the display screen is obviously delayed due to the excessively large preset time, the preset time is usually set to be smaller. On the other hand, a certain time is required for inputting the deleting instruction, and a certain time is also required for moving to the input area of the deleting instruction after the closed curve is input, so that the deleting instruction cannot be effectively detected due to too short preset time, and further, the local deleting operation of the display screen cannot be correctly executed. Preferably, the preset time may be set within a range from 2 seconds to 5 seconds, so as to correctly execute the local deletion operation of the display screen while avoiding an obvious delay of the local deletion operation of the display screen.
And 3, if so, executing the step 4.
And 4, judging whether x/a is smaller than a first value, if so, executing a first action, wherein x is the distance between the area input by the deleting instruction and the geometric center of gravity of the closed curve, a is the average value of the distances from all points on the closed curve to the geometric center of gravity, and the first action is deleting a local picture and the closed curve in the closed curve or deleting a local picture and the closed curve outside the closed curve.
It should be noted that, in this embodiment, the specific numerical value of the first value is not limited, and the user may perform reasonable setting according to actual needs. Exemplarily, the closed curve is a circle with a radius of 4 cm, and the average value of the distances from all points on the closed curve to the geometric center of gravity (the circle center of the circle) is 2 cm, namely, a is 2 cm; the distance between the input area of the deletion instruction and the geometric center of gravity of the circle (the circle center of the circle) is 1 cm, namely x is 1 cm; assuming that the first value is 2, x/a is 1/2, 1/2 is less than 2, and the first action is executed. As can be seen from the above analysis, it is substantially determined whether "x/a is smaller than 1" that the position relationship between the deletion instruction input area and the closed curve is determined, and the embodiment determines whether to execute the first action according to the position relationship.
It should be noted that the specific manner of the first action may also be determined by the user selecting between "delete partial picture inside closed curve and closed curve" and "delete partial picture outside closed curve and closed curve".
According to the technical scheme provided by the embodiment, after any closed curve is input at any position of a display picture, whether a deletion instruction is input within preset time is judged, if yes, a first action is executed when x/a is smaller than a first value, wherein x is the distance between the area of the deletion instruction input and the geometric gravity center of the closed curve, a is the average value of the distances from all points on the closed curve to the geometric gravity center, the first action is to delete a local picture and a closed curve in the closed curve or delete a local picture and a closed curve outside the closed curve, so that a user can conveniently form the closed curve in the display picture to start the deletion action without moving to an entity key outside the display picture to start the deletion action, the convenience of picture deletion is improved, on the other hand, the user can accurately select the local picture to be deleted by adopting any closed curve, the accuracy of deleting the picture is improved, in addition, a user can reasonably set data such as deleting instruction content, specific values of the first values and specific contents of the first actions according to own preference and actual needs, and the individuation of deleting the local picture is improved.
Optionally, step 4 may further include: and if the x/a is judged to be larger than or equal to the first value and smaller than a second value, only deleting the closed curve, wherein the second value is larger than the first value.
It is understood that the substance of the above is: when x/a is larger than or equal to the first value and smaller than the second value, any content in the display screen is not deleted, and only the input closed curve is deleted, namely when the default x/a is larger than or equal to the first value and smaller than the second value, the closed curve is an invalid curve.
The specific value of the second value is not limited in this embodiment, and all the second values greater than the first value are within the protection range of this embodiment.
Exemplarily, the closed curve is a circle with a radius of 4 cm, and the average value of the distances from all points on the closed curve to the geometric center of gravity (the circle center of the circle) is 2 cm, namely, a is 2 cm; the distance between the input area of the deletion instruction and the geometric center of gravity of the circle (the circle center of the circle) is 5 cm, namely x is 5 cm; let the first value be 2 and the second value be 4. Then x/a is 5/2, 5/2 is greater than 2 and less than 4, at which time only the closed curve is deleted.
Optionally, step 4 may further include: and if the x/a is larger than or equal to the second value, executing a second action, wherein when the first action is deleting the local picture and the closed curve in the closed curve, the second action is deleting the local picture and the closed curve outside the closed curve, and when the first action is deleting the local picture and the closed curve outside the closed curve, the second action is deleting the local picture and the closed curve in the closed curve.
Exemplarily, the closed curve is a circle with a radius of 4 cm, and the average value of the distances from all points on the closed curve to the geometric center of gravity (the circle center of the circle) is 2 cm, namely, a is 2 cm; the distance between the input area of the deletion instruction and the geometric center of gravity of the circle (the center of the circle) is 9 cm, namely x is 9 cm; let the first value be 2 and the second value be 4. Then x/a is 9/2, 9/2 is greater than 4, at which time the second action is performed. It will be appreciated that the second action is determined after the first action is determined.
In summary, based on the first value and the second value, the display screen is divided into a first area, a second area and a third area, wherein the distance from each point in the first area to the geometric center of gravity of the closed curve is smaller than the first value, the distance from each point in the second area to the geometric center of gravity of the closed curve is greater than or equal to the first value and smaller than the second value, and the distance from each point in the third area to the geometric center of gravity of the closed curve is greater than or equal to the second value. The first action is performed when the value of x/a falls in the first region, only the closed curve is deleted when the value of x/a falls in the second region, and the second action is performed when the value of x/a falls in the third region.
Optionally, the display color, the gray scale, or the transparency of the first region, the second region, and the third region are different within a preset time.
It should be noted that, by such an arrangement, the first region, the second region and the third region are easily distinguished by human eyes, and then a closed curve can be formed in the region corresponding to the operation to be performed, so that convenience and accuracy of the user operation are further improved.
In this embodiment, step 3 may further include: and if the deletion instruction is not input within the preset time or the non-deletion instruction is input within the preset time, the closed curve is reserved.
It can be understood that, in the process of inputting the picture content, the user is easy to input various closed curves, for example, when a teacher user inputs an example sentence in english on an electronic blackboard, the letter "O" is easy to appear, belongs to one of the closed curves, but is not related to the local deletion operation of the picture, and is the content that needs to be preserved, so that the setting is that no deletion instruction is input within the preset time; or when a non-deleting instruction is input within the preset time, the preset time is ended in advance, the display state presented within the preset time is eliminated, and the closed curve is reserved, so that the user can input correct picture content.
Optionally, before performing the first action, the method may further include: and displaying a first action content selection menu bar, detecting a selection instruction input by a user, and determining the specific content of the first action according to the selection instruction.
It should be noted that the following two selectable items are set in the first action content selection menu bar: 1. the first action is deleting a local picture and a closed curve in the closed curve; 2. the first action is to delete the partial picture outside the closed curve and the closed curve. The user can select one of the two actions according to needs to set the specific content of the first action. Illustratively, two options in the first action content selection menu bar respectively correspond to one check box, and the user only needs to click and check in the check box corresponding to the option to be set directly so as to input the corresponding selection instruction.
Further, the displaying the first action content selection menu bar may include: a first action content selection menu bar is displayed on a closed point of the closed curve.
It should be noted that, with such an arrangement, the first action content selection menu bar can be automatically generated after the closed curve is formed, and other control operations do not need to be executed, which is convenient and fast, and on the other hand, the position where the first action content selection menu bar is formed coincides with the end position of the closed curve input by the user, and the user can perform the selection operation of the option in the first action content selection menu bar at the stop position without moving, thereby further improving the convenience of the user operation.
Illustratively, the delete instruction may include a single line, a multi-line, a preset symbol, a combination of at least two of the above three elements, or a delete selection operation in a delete menu bar. It should be noted that the specific form of the delete command may be customized by a user or preset by a designer, so as to select one of the above forms as its specific form.
Further, the preset symbols may include letters or words.
In this embodiment, within a preset time after the closed curve is input, the display state of the closed curve is different from the display state of other graphics in the display screen, and preferably, the closed curve is different from at least one of the color, transparency, line thickness, and line real and false of other graphics in the display screen.
It should be noted that, by such a setting mode, a user can accurately distinguish the closed curve from other lines, and further accurately identify whether the local picture to be deleted selected by the closed curve is the content to be deleted, so as to avoid the problem of error in deleting the content.
For example, the closed curve may be a preset shape, and the preset shape includes an elliptical closed curve or a polygonal closed curve.
In other embodiments of the present embodiment, the closed curve may have other shapes, and the shape is only described as an example and is not limited herein.
Fig. 4 is a schematic structural diagram of a system for processing partial deletion of a display screen according to an embodiment of the present invention. As shown in fig. 4, the system for processing partial deletion of a display screen may specifically include:
an input recognition module 210, configured to detect whether any closed curve input exists at any position of a display screen;
the instruction judging module 220 is configured to judge whether a deletion instruction is input within a preset time when the input identifying module 210 detects that any closed curve is input at any position of the display screen;
the position determining module 230 is configured to determine whether x/a is smaller than a first value when the instruction determining module 220 determines that a deletion instruction is input within a preset time, where x is a distance between an area where the deletion instruction is input and a geometric center of gravity of the closed curve; a is the average value of the distances from all points on the closed curve to the geometric center of gravity;
the instruction executing module 240 is configured to execute a first action when the position determining module 230 determines that x/a is smaller than a first value, where the first action is to delete a partial picture and a closed curve inside the closed curve or delete a partial picture and a closed curve outside the closed curve.
According to the technical scheme provided by the embodiment, after the input recognition module 210 detects that any closed curve is input at any position of the display screen, the instruction judgment module 220 is adopted to judge whether a deletion instruction is input within a preset time, if yes, the instruction execution module 240 is adopted to execute a first action when the position judgment module 230 judges that x/a is smaller than a first value, wherein x is a distance between an area where the deletion instruction is input and a geometric gravity center of the closed curve, a is an average value of distances from all points on the closed curve to the geometric gravity center, the first action is to delete a local screen and a closed curve in the closed curve or delete a local screen and a closed curve outside the closed curve, so that a user can conveniently form the closed curve in the display screen to start the deletion action without moving to an entity key outside the display screen to start the deletion action, the convenience of deleting the picture is improved, on the other hand, a user can accurately select the local picture to be deleted by adopting any closed curve, the accuracy of deleting the picture is improved, in addition, the user can reasonably set data such as deleting instruction content, specific value of the first value, specific content of the first action and the like according to own preference and actual needs, and the individuation of deleting the picture is improved.
Fig. 5 is a schematic structural diagram of a display device according to an embodiment of the present invention. As shown in fig. 5, the display device 10 includes a partial deletion processing system 11 of a display screen provided in any of the embodiments of the present invention. Since the display device 10 provided in this embodiment includes any of the above-mentioned local deletion processing systems 11 for display screens provided in embodiments of the present invention, the local deletion processing systems 11 for display screens included in the display device have the same or corresponding beneficial effects, and are not described herein again.
Illustratively, the display device 10 may be an electronic blackboard or a display; alternatively, the display device 10 may be a VR/AR/MR display apparatus.
For VR and MR display devices, at least one gesture input device can be configured to perform data acquisition of the gesture in space.
For AR and MR display devices, at least one gestural image capture lens or motion capture device may be configured for data acquisition.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (15)
1. A method for locally deleting a display screen, comprising:
step 1, detecting that any closed curve is input at any position of the display picture;
step 2, judging whether a deleting instruction is input within a preset time:
step 3, if yes, executing step 4;
step 4, judging whether x/a is smaller than a first value, if so, executing a first action;
wherein x is the distance between the area input by the deleting instruction and the geometric center of gravity of the closed curve;
a is the average of the distances from all points on the closed curve to the geometric center of gravity;
the first action is to delete a partial picture in the closed curve and the closed curve, or delete a partial picture outside the closed curve and the closed curve.
2. The method of claim 1, wherein the step 4 further comprises:
if the x/a is judged to be larger than or equal to the first value and smaller than a second value, only deleting the closed curve;
wherein the second value is greater than the first value.
3. The method of claim 2, wherein step 4 further comprises:
if the x/a is larger than or equal to the second value, executing a second action;
when the first action is deleting a local picture in the closed curve and the closed curve, the second action is deleting a local picture outside the closed curve and the closed curve;
and when the first action is deleting the local picture outside the closed curve and the closed curve, the second action is deleting the local picture inside the closed curve and the closed curve.
4. The method of claim 1, wherein step 3 further comprises:
and if the deletion instruction is not input within the preset time or the non-deletion instruction is input within the preset time, the closed curve is reserved.
5. The method according to claim 2, wherein the display screen includes a first region in which the x/a is smaller than the first value, a second region in which the x/a is greater than or equal to the first value and smaller than the second value, and a third region in which the x/a is greater than or equal to the second value;
the first region, the second region and the third region are different in display color, gradation or transparency.
6. The method of claim 1, wherein the performing the first action is preceded by:
displaying a first action content selection menu bar;
and detecting a selection instruction input by a user, and determining the specific content of the first action according to the selection instruction.
7. The method of claim 6, wherein displaying the first action content selection menu bar comprises:
displaying the first action content selection menu bar on a closed point of the closed curve.
8. The method of claim 1, wherein the delete command comprises a single line, a multi-line, a predetermined symbol, a combination of at least two of the three elements, or a delete selection operation in a delete menu bar.
9. The method of claim 8, wherein the predetermined symbol comprises a letter or a word.
10. The method according to claim 1, wherein when the closed curve is input within the preset time, the display state of the closed curve is different from the display state of other graphics in the display screen, and preferably, the closed curve is different from at least one of the color, transparency, line thickness and line real and false states of other graphics in the display screen.
11. The method of claim 1, wherein the closed curve is a preset shape, and the preset shape comprises an elliptical closed curve or a polygonal closed curve.
12. A partial deletion processing system for a display screen, comprising:
the input identification module is used for detecting whether any closed curve input exists at any position of a display picture;
the instruction judging module is used for judging whether a deleting instruction is input within preset time when the input identifying module detects that any closed curve is input at any position of the display picture;
the position judgment module is used for judging whether x/a is smaller than a first value or not when the instruction judgment module judges that a deletion instruction is input within preset time, wherein x is the distance between an area input by the deletion instruction and the geometric center of gravity of the closed curve; a is the average of the distances from all points on the closed curve to the geometric center of gravity;
and the instruction execution module is used for executing a first action when the position judgment module judges that the x/a is smaller than a first value, wherein the first action is deleting a local picture in the closed curve and the closed curve or deleting a local picture outside the closed curve and the closed curve.
13. A display device characterized by comprising the partial deletion processing system of the display screen according to claim 12.
14. The display device according to claim 13, wherein the display device is an electronic blackboard or a display.
15. A display device as claimed in claim 13, characterized in that the display device is a VR/AR/MR display apparatus.
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