CN109375980A - Touch-control drawing practice based on Andriod system - Google Patents
Touch-control drawing practice based on Andriod system Download PDFInfo
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- CN109375980A CN109375980A CN201811282265.XA CN201811282265A CN109375980A CN 109375980 A CN109375980 A CN 109375980A CN 201811282265 A CN201811282265 A CN 201811282265A CN 109375980 A CN109375980 A CN 109375980A
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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
- G06T11/20—Drawing from basic elements, e.g. lines or circles
- G06T11/206—Drawing of charts or graphs
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/44—Arrangements for executing specific programs
- G06F9/451—Execution arrangements for user interfaces
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Abstract
The present invention relates to field of software development, aiming at the problem that existing touch-control method for drafting bring draws delay, it is proposed a kind of touch-control drawing practice based on Andriod system, it include: to work as to capture incoming event, real-time collecting simultaneously stores the corresponding touch data of incoming event, if incoming event presses for touch-control or touch-control moving event, the correspondence touch data being close according to current touch data and therewith calculates current drawing area and current drawing path, current drawing path is plotted on dynamic painting canvas, copy the display that graph data on dynamic painting canvas carries out current Graphics to graphics hardware frame buffer；If incoming event is that touch-control lifts event, complete drawing area and complete drawing path are calculated according to the touch data of storage, complete drawing path is plotted on static painting canvas, method for refreshing is called to copy the display that the graph data in static painting canvas carries out full graphics to graphics hardware frame buffer.The present invention is suitable for directly operating the Android device of graphics hardware frame buffer.
Description
Technical field
The present invention relates to field of software development, in particular to a kind of touch-control drawing practice.
Background technique
Intelligent interaction large-size screen monitors refer to the liquid crystal display with Android operation system and touch interactive system, pass through
Touch-control system realizes human-computer interaction.Interacting large-size screen monitors can built-in plug-in OPS computer (86 framework of standard x) or use cloud
Virtual desktop, make interactive large-size screen monitors that there is Android and Windows dual operating systems feature.It can switch between operating system,
Corresponding software is run in each system, to meet the application demand of the occasions such as education and instruction, commercial meeting.
The most basic function of large-size screen monitors of having touch interactive system is to support finger or other objects directly exist
The enterprising row text of screen writes and display, realizes that the application program of these functions is exactly whiteboarding software.With android system
It is universal, the big screen equipment of intelligent interaction using more and more common.Write the core function as intelligent interaction large-size screen monitors, script
It tests by user's pay attention to day by day, this includes response speed, the smooth degree of person's handwriting etc. write.
The existing Plot Work mechanism based on primary Android graphics rendering system are as follows: after system receives incoming event
Triggering is redrawn, and is redrawn and is needed to re-measure drawing area and generate drawing path, then gives drawing path and drawing area
SurfaceFlinger call the library OpenGL carry out figure layer mixing and rendering obtain graphing, finally by graphing copy
On shellfish to hardware frame buffer, that is, FrameBuffer, the hardware frame buffer refresh cycle signal of figure is then waited to arrive
It carries out refreshing to show, the frequency of refresh cycle signal is usually 60Hz for Android graphics system, i.e., every about 16ms
A refresh cycle signal is generated, it is primary since drawing area and drawing path are respectively complete area and complete path
The refreshing of Android graphics system is the refreshing based on drawing path, and the area size that drawing path refreshes can be with write events
Increase and increase, the drafting complexity in path is caused to improve, calculation amount increases, and the mixing and rendering of figure layer will also spend very long
Event, needs several refresh cycle information, and graphing gets to hardware frame buffer, the delay of drafting reach 100ms with
On.Furthermore refreshing can be all generated when incoming event each due to intelligent interaction large-size screen monitors using primary Android graphics rendering system
Request, and intelligent interaction large-size screen monitors touch-control input frequency it is higher generally 100Hz~150Hz, this will lead to Android figure
The obstruction of system call.
Summary of the invention
The technical problems to be solved by the present invention are: existing touch-control method for drafting bring is overcome to draw asking for delay
Topic, proposes a kind of touch-control drawing practice based on Andriod system.
The present invention solves above-mentioned technical problem, the technical solution adopted is that:
Touch-control drawing practice based on Andriod system, includes the following steps:
When capturing incoming event, real-time collecting and the corresponding touch data of the touch point for storing incoming event are described
Incoming event includes that touch-control presses event, touch-control moving event and touch-control and lifts event；
If the incoming event is that touch-control presses event or touch-control moving event, according to the corresponding touch-control of current touch point
Data and touch data corresponding with the touch point that current touch point is close calculate current drawing area and current drawing path,
The current drawing path of current drawing area is plotted on dynamic painting canvas, drawing area is corresponding before copy dynamic painting canvas is taken in
The display of current Graphics is carried out after graph data to graphics hardware frame buffer；
If the incoming event is that touch-control lifts event, complete drawing area is calculated according to all touch datas of storage
With complete drawing path, the complete drawing path of complete drawing area is plotted on static painting canvas, calls method for refreshing copy
The corresponding graph data of complete drawing area carries out the display of full graphics to graphics hardware frame buffer in static painting canvas.
Preferably, described that the current drawing path of current drawing area is plotted on dynamic painting canvas as using Android
Local layer Skia shape library or OpenGL drawing engine realize the drafting of figure.
Preferably, described that the complete drawing path of complete drawing area is plotted on static painting canvas as using Android
The primary Canvas class of application layer or SurfaceView class realize the drafting of figure.
Preferably, the touch point being close with current touch point includes: with current touch point at a distance of nearest touch-control
Point, with current touch point at a distance of the second close touch point and with current touch point at a distance of the close touch point of third.
Preferably, using bezier curve algorithm according to current touch data and the touch point pair being close with current touch point
The touch data answered calculates current drawing path.
Further, when graphics hardware frame buffer is multiple, drawing area pair before the copy dynamic painting canvas is taken in
The graph data answered is to graphics hardware frame buffer are as follows: the corresponding graph data of drawing area is to institute before copy dynamic painting canvas is taken in
Some graphics hardware frame buffers.
Preferably, the incoming event includes that touch-control presses event and/or touch-control moving event.
Further, when the content update in static painting canvas, the content synchronization of static painting canvas is updated to dynamic painting canvas
In.
The beneficial effects of the present invention are:
It is combined using dynamic painting canvas and static painting canvas, on drawing process, completes current graphing in dynamic painting canvas
Drafting after will directly the current graphing that refreshes be needed directly to be submitted to graphics hardware frame buffer, need not move through figure layer
Mixing, has bypassed the limitation of Android graphics frame, and current graphing is mapped on screen in real time, draws delay
Biggish improvement is obtained；On drawing area, the size of drawing area is reduced to by complete drawing area according to current
The current drawing area that touch data and the touch point adjacent with current touch point determine, so that the size of drawing area will not be with
The growth of write events and increase, and the current graphing of the current drawing area is only passed to graphic hardware frame every time
Buffer area greatly improves drafting efficiency, and when this programme is applied to intelligent interaction large-size screen monitors terminal, drawing delay can be by original
100ms or more be reduced to 40ms or so.
Detailed description of the invention
Fig. 1 is the method flow diagram of the embodiment of the present invention.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, right with reference to the accompanying drawings and embodiments
The present invention is further elaborated.
Touch-control drawing practice based on Andriod system, includes the following steps:
When capturing incoming event, real-time collecting and the corresponding touch data of the touch point for storing incoming event are described
Incoming event includes that touch-control presses event, touch-control moving event and touch-control and lifts event；
If the incoming event is that touch-control presses event or touch-control moving event, according to the corresponding touch-control of current touch point
Data and touch data corresponding with the touch point that current touch point is close calculate current drawing area and current drawing path,
The current drawing path of current drawing area is plotted on dynamic painting canvas, drawing area is corresponding before copy dynamic painting canvas is taken in
The display of current Graphics is carried out after graph data to graphics hardware frame buffer.
Above-mentioned dynamic painting canvas is used for real-time rendering figure, and the current drawing path of current drawing area is plotted to dynamic picture
It is the method for drafting that dynamic painting canvas can be used on cloth, which does not limit to Android local layer Skia shape library or local
OpenGL drawing engine realize the drafting of figure.
Since android system can show figure using the mechanism that multiple graphics hardware frame buffers are refreshed in turn automatically
Shape, in order to guarantee the real-time display of current drawing image, when graphics hardware frame buffer is multiple, the copy dynamic painting canvas
The corresponding graph data of current drawing area is gone up to graphics hardware frame buffer are as follows: drawing area pair before copy dynamic painting canvas is taken in
The graph data answered is to all graphics hardware frame buffers.
In order to guarantee the continuity of current drawing path, the touch point being close with current touch point includes: and works as
Preceding touch point at a distance of nearest touch point, with current touch point at a distance of the second close touch point and with current touch point at a distance of third
Close touch point.The above-mentioned touch point being close with current touch point can be carried out searching in the touch data of storage and be compared
Out.Certainly, the number for the touch point being close can be not limited only to three, can be according to the algorithm for being actually used in current drawing path
Demand is chosen.
Bezier curve algorithm specifically can be used according to current touch data and the touch point pair being close with current touch point
The touch data answered calculates current drawing path.
If the incoming event is that touch-control presses event or touch-control moving event, according to the corresponding touch-control of current touch point
Data and touch data corresponding with the touch point that current touch point is close calculate current drawing area and current drawing path,
The current drawing path of current drawing area is plotted on dynamic painting canvas, drawing area is corresponding before copy dynamic painting canvas is taken in
The display of current Graphics is carried out after graph data to graphics hardware frame buffer.
Above-mentioned method for refreshing is the primary method for refreshing of Android.
It is described that the complete drawing path of complete drawing area is plotted to the drafting that static painting canvas can be used on static painting canvas
Method realizes the drafting of figure using the primary Canvas class of Android application layer or SurfaceView class.
Only it is responsible for real-time rendering current Graphics in view of dynamic painting canvas, static painting canvas may include but be not limited to static drawn
Whole figure will also be handled such as to the other functions of the mixing of graphing, erasing, movement and zoom etc., to guarantee
The update of static painting canvas caused by any UI operation can be synchronized on dynamic painting canvas, the content update in static painting canvas
When, the content synchronization of static painting canvas is updated in dynamic painting canvas.
It should be noted that this touch-control drawing practice can be applicable to intelligent interaction large-size screen monitors terminal, smart phone, tablet computer
Or on some other smart machines with android system.
Embodiment
As shown in Figure 1, the touch-control drawing practice based on Andriod system, includes the following steps:
S1, application dynamic painting canvas and static painting canvas；
It may wait for the input of user at this time.
S2, when capturing touch-control and pressing event or touch-control moving event, worked as using the method for drafting drafting of dynamic painting canvas
Preceding figure, the fooled preceding corresponding graph data of drawing area of copy dynamic painting canvas to graphics hardware frame buffer；
Above-mentioned steps S2 specifically comprises the following steps:
S201, real-time collecting and the corresponding touch data of touch point for storing incoming event obtain and current touch point phase
Away from nearest touch point, with current touch point at a distance of the second close touch point and with current touch point at a distance of the close touch-control of third
Point obtains current drawing area according to current touch data and the corresponding touch data of above-mentioned touch point and using bezier curve
Algorithm calculates current drawing path；
S202, dynamic painting canvas call Skia or OpenGL drawing engine to draw the current drawing path of current drawing area
Onto dynamic painting canvas, the fooled preceding corresponding graph data of drawing area of copy dynamic painting canvas to graphics hardware frame buffer；
S203, android system refresh the corresponding graph data of display current region automatically and show current Graphics；
S3, when capturing touch-control and lifting event, full graphics is drawn using static painting canvas, refreshes display full graphics.
Above-mentioned steps S3 includes the following steps:
S301, complete drawing area is calculated according to all touch datas of storage and is calculated using bezier curve algorithm
To complete drawing path；
The Canvas class that S302, static painting canvas call Android primary is drawn to obtain complete to complete drawing path
Figure, method for drafting can be used DrawPath/DrawLine etc., and the method for refreshing for calling Android primary is by full graphics
It is copied to graphics hardware frame buffer；
S303, android system refresh the full graphics in display graphics hardware frame buffer automatically.
Although it is consistent to draw content on dynamic painting canvas and static painting canvas, since the drafting of static painting canvas is Android primary
Drawing practice finally can still call hardware frame buffer to carry out the refreshing of image, and dynamic painting canvas can be copied to hardware frame by when refreshing
The data cover of buffer area, user will not only experience from dynamic painting canvas and be switched to the variation that static painting canvas is shown, can be with
Very easily operations and the real-time display such as wipe, cancel and reform to user to contact data.
It will be understood by those skilled in the art that provided in an embodiment of the present invention copy in local draw library and drawing engine draws
Shellfish is to hardware frame buffer and is synchronized to the method drawn on static painting canvas, suitable for having android system and can be straight
Connect all devices of operation hardware frame buffer.
Claims (7)
1. the touch-control drawing practice based on Andriod system, which comprises the steps of:
When capturing incoming event, real-time collecting and the corresponding touch data of the touch point for storing incoming event, the input
Event includes that touch-control presses event, touch-control moving event and touch-control and lifts event；
If the incoming event is that touch-control presses event or touch-control moving event, according to the corresponding touch data of current touch point
And touch data corresponding with the touch point that current touch point is close calculates current drawing area and current drawing path, will work as
The current drawing path of preceding drawing area is plotted on dynamic painting canvas, the corresponding figure of drawing area before copy dynamic painting canvas is taken in
The display of current Graphics is carried out after data to graphics hardware frame buffer；
If the incoming event is that touch-control lifts event, complete drawing area and complete is calculated according to all touch datas of storage
The complete drawing path of complete drawing area is plotted on static painting canvas by whole drawing path, calls method for refreshing copy static
The corresponding graph data of complete drawing area carries out the display of full graphics to graphics hardware frame buffer in painting canvas.
2. as described in claim 1 based on the touch-control drawing practice of Andriod system, which is characterized in that described currently to draw
The current drawing path in region processed is plotted on dynamic painting canvas to draw using Android local layer Skia shape library or OpenGL
Engine realizes the drafting of figure.
3. as described in claim 1 based on the touch-control drawing practice of Andriod system, which is characterized in that described completely to draw
The complete drawing path in region processed be plotted on static painting canvas as using the primary Canvas class of Android application layer or
SurfaceView class realizes the drafting of figure.
4. as described in claim 1 based on the touch-control drawing practice of Andriod system, which is characterized in that described and current touching
The touch point that control point is close includes: close at a distance of second at a distance of nearest touch point and current touch point with current touch point
Touch point and with current touch point at a distance of the close touch point of third.
5. as described in claim 1 based on the touch-control drawing practice of Andriod system, which is characterized in that bent using Bayside
Line algorithm is according to the corresponding touch data of current touch point and touch data corresponding with the touch point that current touch point is close
Calculate current drawing path.
6. as described in claim 1 based on the touch-control drawing practice of Andriod system, which is characterized in that when graphic hardware frame
When buffer area is multiple, the fooled preceding corresponding graph data of drawing area of the copy dynamic painting canvas to graphics hardware frame buffer
Are as follows: the fooled preceding corresponding graph data of drawing area of copy dynamic painting canvas to all graphics hardware frame buffers.
7. as described in claim 1 based on the touch-control drawing practice of Andriod system, which is characterized in that when in static painting canvas
Content update when, the content synchronization of static painting canvas is updated in dynamic painting canvas.
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| CN112799583A (en) * | 2021-04-13 | 2021-05-14 | 北京三维天地科技股份有限公司 | Point location schematic drawing system based on android platform |
| CN113495665A (en) * | 2020-03-19 | 2021-10-12 | 斑马智行网络(香港)有限公司 | Image display method, image display device, electronic equipment and computer readable storage medium |
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| CN109375980B (en) | 2021-10-15 |
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