CN106373171B - Drawing prediction compensation method and system - Google Patents
Drawing prediction compensation method and system Download PDFInfo
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Abstract
The invention discloses a drawing prediction compensation method and a system, which comprises the steps of judging whether a mouse is in a pressure drop state or not, if so, emptying a preset drawing point table, adding mouse event point information into the drawing point table, and fitting a drawing track according to point information in the drawing point table; if the mouse is not in a moving state, if the mouse event point information is added into a preset drawing point table, judging whether the event point information in the drawing point table is larger than or equal to a preset threshold value, calculating to obtain the position information of the predicted point, and fitting the drawing track according to the obtained predicted point and all information in the drawing point table; if the mouse is not in the lifting state, if the mouse is in the lifting state, adding the mouse event point information into the drawing point table, fitting the drawing track according to the point information in the drawing point table, and then exiting; if not, directly exiting. Therefore, the invention can effectively reduce the visual difference between drawing and refreshing.
Description
Technical Field
The present invention relates to the field of electronics, and in particular, to a method and system for rendering prediction compensation.
Background
At present, when writing is carried out under an Android platform, a drawing track is slower than system refreshing. The faster the drawing is, the more obvious the time difference between the drawing and the refreshing is, and the untimely refreshing causes visual difference to the user.
Disclosure of Invention
In view of the above, the present invention provides a method and a system for drawing prediction compensation, which can improve a drawing algorithm and reduce visual differences between drawing and refreshing.
The invention provides a drawing prediction compensation method based on the above purpose, which comprises the following steps:
firstly, triggering a mouse drawing event;
secondly, judging whether the mouse is in a falling state, if so, performing a third step, and if not, performing a sixth step;
thirdly, emptying a preset drawing point table;
fourthly, adding the mouse event point information into a drawing point table;
fifthly, fitting a drawing track according to point information in the drawing point table, and then returning to the first step;
sixthly, judging whether the mouse is in a moving state, if so, performing a seventh step, and if not, performing an eleventh step;
seventhly, adding the mouse event point information into a preset drawing point table;
eighthly, judging whether the event point information in the drawing point table is greater than or equal to a preset threshold value or not, if not, returning to the fifth step, and if so, performing the ninth step;
ninthly, calculating to obtain the position information of the predicted point;
step ten, fitting a drawing track according to the obtained predicted points and all information in the drawing point table, and then returning to the step one;
step ten, judging whether the mouse is in a lifting state, if so, adding the mouse event point information into a drawing point table, and then fitting a drawing track according to the point information in the drawing point table and exiting; if not, directly exiting.
Optionally, the mapping point table records coordinates of each event point and the time of acquisition.
Further, the preset threshold value is 3.
Further, the ninth step extracts information of three event points stored last in the drawing point table, and calculates to obtain the predicted point position information.
Further, the extracting information of the three event points stored in the drawing point table at last, and the calculating to obtain the predicted point position information includes:
sequentially and respectively obtaining the coordinates and the obtaining time of the event point information A1 stored last, the event point information A2 stored last but one, and the event point information A3 stored last but one, namely A1(x1,y1)、A2(x2,y2)、A3(x3,y3) And T1、T2、T3(ii) a Then according to formula V3＝(A3-A2)/(T3-T2) Obtaining A2A3Average velocity V of the segments3According to formula V2＝(A2-A1)/(T2-T1) Obtaining A1A2Average velocity V of the segments2According to formula a2＝V3-V2Obtaining A2Instantaneous acceleration a of a point2；
Furthermore, the predicted point and the maximum pointAverage velocity V of line segment between post-stored event points4＝a2+V3Then, the position A of the predicted point is obtained4＝V4*Ta+A3(ii) a Wherein, T isaIs the average of the acquisition times of the three last stored event points in the plotted points table, i.e. Ta＝(T1+T2+T3)/3。
Optionally, after obtaining the position information of the predicted point by the calculation, judging whether the prediction is the first prediction, and if so, directly performing the eleventh step; if not, deleting the track drawn according to the predicted point last time, and then performing step eleven.
Further, the obtained predicted point information is stored in a preset predicted point list including coordinates of predicted points.
Further, when judging whether the prediction is the first prediction, whether the prediction point information is stored in a preset prediction point list is checked, if so, the prediction is not the first prediction, and if not, the prediction is the first prediction.
Furthermore, the Bessel method is adopted for fitting and drawing the curve.
In addition, the invention also provides a drawing prediction compensation system, which comprises an event trigger unit, a drop-pressure state judgment unit, a moving state judgment unit and a lifting state judgment unit which are connected in sequence; the event triggering unit triggers a mouse drawing event, then the falling state judging unit judges whether the mouse is in a falling state, if so, a preset drawing point table is emptied, mouse event point information is added into the drawing point table, and a drawing track is fitted according to point information in the drawing point table; if not, the mobile state judging unit is connected with the mobile state judging unit;
the movement state judging unit judges whether the mouse is in a movement state, if so, the mouse event point information is added into a preset drawing point table, whether the event point information in the drawing point table is larger than or equal to a preset threshold value is judged, if not, a drawing track is fitted according to the point information in the drawing point table, if so, the three event point information finally stored in the drawing point table is extracted, the position information of a predicted point is obtained, and then the drawing track is fitted according to the obtained predicted point and all information in the drawing point table;
if not, the mouse is connected with the lifting state judgment unit, the lifting state judgment unit judges whether the mouse is in a lifting state, if so, the mouse event point information is added into the drawing point table, and then the drawing track is fitted according to the point information in the drawing point table and then the mouse exits; if not, directly exiting.
Optionally, the mapping point table records coordinates of each event point and the time of acquisition.
Further, the preset threshold value is 3.
Further, the step of extracting the information of the three event points finally stored in the drawing point table by using the calculation to obtain the position information of the predicted point includes:
sequentially and respectively obtaining the coordinates and the obtaining time of the event point information A1 stored last, the event point information A2 stored last but one, and the event point information A3 stored last but one, namely A1(x1,y1)、A2(x2,y2)、A3(x3,y3) And T1、T2、T3(ii) a Then according to formula V3＝(A3-A2)/(T3-T2) Obtaining A2A3Average velocity V of the segments3According to formula V2＝(A2-A1)/(T2-T1) Obtaining A1A2Average velocity V of the segments2According to formula a2＝V3-V2Obtaining A2Instantaneous acceleration a of a point2；
Furthermore, the average speed V of the line segment between the predicted point and the last stored event point4＝a2+V3Then, the position A of the predicted point is obtained4＝V4*Ta+A3(ii) a Wherein, T isaIs the average of the acquisition times of the last three stored event points in the plotted points tableValue, i.e. Ta＝(T1+T2+T3)/3。
Further, after obtaining the position information of the predicted point by the calculation, judging whether the prediction is the first prediction, if so, directly connecting the mobile state judgment unit with the lifting state judgment unit; if not, the track drawn according to the predicted point at the last time is deleted, and then the moving state judgment unit is connected with the lifting state judgment unit.
Further, the obtained predicted point information is stored in a preset predicted point list including coordinates of predicted points.
Further, when judging whether the prediction is the first prediction, whether the prediction point information is stored in a preset prediction point list is checked, if so, the prediction is not the first prediction, and if not, the prediction is the first prediction.
Furthermore, the Bessel method is adopted for fitting and drawing the curve.
From the above, the method and the system for drawing prediction compensation provided by the invention have the advantages that by judging whether the mouse is in the pressure drop state or not, if the mouse is in the pressure drop state, the preset drawing point table is emptied, the mouse event point information is added into the drawing point table, and the drawing track is fitted according to the point information in the drawing point table; if the mouse is not in a moving state, if the mouse event point information is added into a preset drawing point table, judging whether the event point information in the drawing point table is larger than or equal to a preset threshold value, calculating to obtain the position information of the predicted point, and fitting the drawing track according to the obtained predicted point and all information in the drawing point table; if the mouse is not in the lifting state, if the mouse is in the lifting state, adding the mouse event point information into the drawing point table, fitting the drawing track according to the point information in the drawing point table, and then exiting; if not, directly exiting. Therefore, the drawing prediction compensation method and the system can correspondingly compensate the current drawing track through the drawing track and the drawing speed, and the visual fall caused by untimely drawing refreshing to a user is greatly improved.
Drawings
FIG. 1 is a flow chart illustrating a method for prediction compensation according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a method of prediction compensation according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a prediction compensation system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
In an embodiment of the present invention, as shown in fig. 1, a flow diagram of a drawing prediction compensation method according to an embodiment of the present invention is shown, where the drawing prediction compensation method includes:
And 102, judging whether the mouse is in a falling state or not, if so, performing a step 103, and if not, performing a step 106.
And 103, emptying a preset drawing point table.
And 104, adding the mouse event point information into the drawing point table.
And step 105, fitting the drawing track according to the point information in the drawing point table, and then returning to the step 101.
And step 106, judging whether the mouse is in a moving state, if so, executing step 107, and if not, executing step 111.
And step 107, adding the mouse event point information into a preset drawing point table.
And step 108, judging whether the event point information in the drawing point table is greater than or equal to 3, if not, returning to step 105, and if so, performing step 109.
And step 109, extracting the information of the three event points finally stored in the drawing point table to obtain the position information of the predicted point.
And step 110, fitting the drawing track according to the obtained predicted points and all the information in the drawing point table, and then returning to the step 101.
In another embodiment of the present invention, referring to fig. 2, the method for compensation of rendering prediction includes:
In an embodiment, the plotted point table records the coordinates and the time of acquisition of each event point.
And step 208, judging whether the event point information in the drawing point table is greater than or equal to 3, if not, returning to step 205, and if so, performing step 209.
And step 209, extracting the information of the three event points finally stored in the drawing point table to obtain the position information of the predicted point.
Preferably, the calculating of the predicted point position information includes: the coordinates and the acquisition times of a1 (the last stored event point information), a2 (the second last stored event point information), A3 (the third last stored event point information), namely, a, can be respectively obtained in order according to the chronological order1(x1,y1)、A2(x2,y2)、A3(x3,y3) And T1、T2、T3. Then theAccording to formula V3＝(A3-A2)/(T3-T2) Obtaining A2A3Average velocity V of the segments3According to formula V2＝(A2-A1)/(T2-T1) Obtaining A1A2Average velocity V of the segments2According to formula a2＝V3-V2Obtaining A2Instantaneous acceleration a of a point2. It should be noted that the calculation of the above three formulas is vector calculation, and the resulting value is also a vector value.
Furthermore, the average speed V of the line segment between the predicted point and the last stored event point4＝a2+V3. Then, the position A of the predicted point is obtained4＝V4*Ta+A3. Wherein, T isaIs the average of the acquisition times of the three last stored event points in the plotted points table, i.e. Ta＝(T1+T2+T3)/3。
In another embodiment of the present invention, the obtained predicted point information may be stored in a preset predicted point list including coordinates of predicted points. Preferably, when determining whether the prediction is the first prediction, it is possible to check whether the prediction point information is stored in a preset prediction point list, if so, it indicates that the prediction is not the first prediction, otherwise, it is the first prediction.
And step 211, fitting the drawing track according to the obtained predicted points and all the information in the drawing point table, and then returning to step 201.
Preferably, the fitting and curve drawing described above are performed by the bezier method.
As another embodiment of the present invention, as shown in fig. 3, a schematic structural diagram of a drawing prediction compensation system according to an embodiment of the present invention is shown, and the drawing prediction compensation system includes an event trigger unit 301, a dropped state determination unit 302, a moving state determination unit 303, and a lifted state determination unit 304, which are connected in sequence. The event triggering unit 301 triggers a mouse drawing event, the drop state judging unit 302 judges whether the mouse is in a drop state, if so, the preset drawing point table is emptied, mouse event point information is added into the drawing point table, and a drawing track is fitted according to point information in the drawing point table. If not, the mouse is connected with the movement state judgment unit 303, the movement state judgment unit 303 judges whether the mouse is in a movement state, if so, the mouse event point information is added into a preset drawing point table, whether the event point information in the drawing point table is greater than or equal to 3 is judged, if not, the drawing track is fitted according to the point information in the drawing point table, if so, the three event point information finally stored in the drawing point table is extracted, the position information of the predicted point is obtained, and then the drawing track is fitted according to the obtained predicted point and all the information in the drawing point table.
If not, the mouse is connected with the lifting state judgment unit 304, the lifting state judgment unit 304 judges whether the mouse is in a lifting state, if so, the mouse event point information is added into the drawing point table, and then the drawing track is fitted according to the point information in the drawing point table and then the mouse exits; if not, directly exiting.
In summary, the drawing prediction compensation method and system provided by the invention creatively provide that the current drawing track is compensated correspondingly through the drawing track and the drawing speed, so as to reduce the visual difference between drawing and refreshing; the invention can solve the problem of visual difference caused by untimely hardware refreshing during fast drawing; moreover, the drawing prediction compensation method and the system perform fitting drawing specifically aiming at different falling, moving and lifting states of the mouse; meanwhile, the invention can provide better handwriting drawing experience for the user, and also judges whether the handwriting is predicted for the first time in the compensation process, and if not, deletes the track drawn according to the predicted point for the last time; finally, the whole drawing prediction compensation method and system are simple, convenient and compact and are easy to realize.
Those of ordinary skill in the art will understand that: the invention is not to be considered as limited to the specific embodiments thereof, but is to be understood as being modified in all respects, all changes and equivalents that come within the spirit and scope of the invention.
Claims (10)
1. A method of draw prediction compensation, comprising the steps of:
firstly, triggering a mouse drawing event;
secondly, judging whether the mouse is in a falling state, if so, performing a third step, and if not, performing a sixth step;
thirdly, emptying a preset drawing point table; the drawing point table records the coordinates of each event point and the acquisition time;
fourthly, adding the mouse event point information into a drawing point table;
fifthly, fitting a drawing track according to point information in the drawing point table, and then returning to the first step;
sixthly, judging whether the mouse is in a moving state, if so, performing a seventh step, and if not, performing an eleventh step;
seventhly, adding the mouse event point information into a preset drawing point table;
eighthly, judging whether the event point information in the drawing point table is greater than or equal to a preset threshold value or not, if not, returning to the fifth step, and if so, performing the ninth step; wherein the preset threshold is 3;
ninthly, calculating to obtain the position information of the predicted point;
step ten, fitting a drawing track according to the obtained predicted points and all information in the drawing point table, and then returning to the step one;
step ten, judging whether the mouse is in a lifting state, if so, adding the mouse event point information into a drawing point table, and then fitting a drawing track according to the point information in the drawing point table and exiting; if not, directly exiting;
wherein, the ninth step extracts the information of the three event points stored last in the drawing point table, and calculates to obtain the position information of the predicted point, and includes:
sequentially and respectively obtaining the coordinates and the obtaining time of the event point information A1 stored last, the event point information A2 stored last but one, and the event point information A3 stored last but one, namely A1(x1,y1)、A2(x2,y2)、A3(x3,y3) And T1、T2、T3(ii) a Then according to formula V3＝(A3-A2)/(T3-T2) Obtaining A2A3Average velocity V of the segments3According to formula V2＝(A2-A1)/(T2-T1) Obtaining A1A2Average velocity V of the segments2Obtaining A according to the formula2Instantaneous acceleration a of a point2；
Furthermore, the average speed V of the line segment between the predicted point and the last stored event point4＝a2+V3Then, the position A of the predicted point is obtained4＝V4*Ta+A3(ii) a Wherein, T isaIs the average of the acquisition times of the three last stored event points in the plotted points table, i.e. Ta＝(T1+T2+T3)/3。
2. The method according to claim 1, characterized in that after obtaining the position information of the predicted point by the calculation, judging whether the position information is the first prediction, if so, directly performing the step eleven; if not, deleting the track drawn according to the predicted point last time, and then performing step eleven.
3. The method according to claim 2, wherein the obtained predicted point information is stored in a preset predicted point list including coordinates of predicted points.
4. The method according to claim 3, wherein the first prediction is determined by checking whether the preset prediction point list stores the prediction point information, if so, it is determined not to be the first prediction, otherwise, it is determined to be the first prediction.
5. The method according to any one of claims 1 to 4, wherein the fitting and the plotting are performed by a Bessel method.
6. A drawing prediction compensation system is characterized by comprising an event trigger unit, a drop-down state judgment unit, a moving state judgment unit and a lifting state judgment unit which are sequentially connected; the event triggering unit triggers a mouse drawing event, then the falling state judging unit judges whether the mouse is in a falling state, if so, a preset drawing point table is emptied, mouse event point information is added into the drawing point table, and a drawing track is fitted according to point information in the drawing point table; the drawing point table records the coordinates of each event point and the acquisition time; if not, the mobile state judging unit is connected with the mobile state judging unit;
the mobile state judging unit judges whether the mouse is in a mobile state, if so, the mouse event point information is added into a preset drawing point table, and whether the event point information in the drawing point table is greater than or equal to a preset threshold value, wherein the preset threshold value is 3; if not, fitting the drawing track according to the point information in the drawing point table, if so, extracting the information of three event points finally stored in the drawing point table, calculating to obtain the position information of the predicted point, and then fitting the drawing track according to the obtained predicted point and all the information in the drawing point table;
if not, the mouse is connected with the lifting state judgment unit, the lifting state judgment unit judges whether the mouse is in a lifting state, if so, the mouse event point information is added into the drawing point table, and then the drawing track is fitted according to the point information in the drawing point table and then the mouse exits; if not, directly exiting;
wherein, the calculating to obtain the position information of the predicted point adopts the extraction of the three event point information finally stored in the drawing point table, which comprises the following steps:
sequentially and respectively obtaining the coordinates and the obtaining time of the event point information A1 stored last, the event point information A2 stored last but one, and the event point information A3 stored last but one, namely A1(x1,y1)、A2(x2,y2)、A3(x3,y3) And T1、T2、T3(ii) a Then according to formula V3＝(A3-A2)/(T3-T2) Obtaining A2A3Average velocity V of the segments3According to formula V2＝(A2-A1)/(T2-T1) Obtaining A1A2Average velocity V of the segments2According to formula a2＝V3-V2Obtaining A2Instantaneous acceleration a of a point2；
Furthermore, the average speed V of the line segment between the predicted point and the last stored event point4＝a2+V3Then, the position A of the predicted point is obtained4＝V4*Ta+A3(ii) a Wherein, T isaIs the average of the acquisition times of the three last stored event points in the plotted points table, i.e. Ta＝(T1+T2+T3)/3。
7. The system according to claim 6, wherein after obtaining the position information of the predicted point by the calculation, the system determines whether the position information is the first prediction, and if so, the moving state determining unit is directly connected to the lifting state determining unit; if not, the track drawn according to the predicted point at the last time is deleted, and then the moving state judgment unit is connected with the lifting state judgment unit.
8. The system according to claim 7, wherein the obtained predicted point information is stored in a preset predicted point list including coordinates of predicted points.
9. The system according to claim 8, wherein the first prediction is determined by checking whether the preset prediction point list stores the prediction point information, if so, it is determined not to be the first prediction, otherwise, it is determined to be the first prediction.
10. The system according to any one of claims 6 to 9, wherein the fitting and plotting are performed by a bezier method.
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| CN111596543B (en) * | 2020-06-10 | 2023-10-13 | 嘉兴市像景智能装备有限公司 | Method for rapidly planning 6-order S-shaped motion curve |
| CN112433666B (en) * | 2020-12-14 | 2022-04-05 | 四川长虹电器股份有限公司 | Method for drawing curve by touch based on browser kernel |
| CN112732105B (en) * | 2020-12-31 | 2023-03-28 | 贵阳动视云科技有限公司 | Mouse jitter control method and device |
| CN112764616B (en) * | 2021-01-22 | 2021-11-26 | 广州文石信息科技有限公司 | Method, device and equipment for accelerating handwriting of electronic ink screen and storage medium |
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