CN104238863A - Android-based enclosing zooming method and system - Google Patents
Android-based enclosing zooming method and system Download PDFInfo
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- CN104238863A CN104238863A CN201410438956.XA CN201410438956A CN104238863A CN 104238863 A CN104238863 A CN 104238863A CN 201410438956 A CN201410438956 A CN 201410438956A CN 104238863 A CN104238863 A CN 104238863A
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Abstract
The invention provides an Android-based enclosing zooming method and an Android-based enclosing zooming system. The method comprises the following steps of reading data in a frame-buffer memory, and generating a screenshot picture according to the data and displaying the screenshot picture on a screen; monitoring a screen touch event, and generating an enclosing area; according to screen parameters and the enclosing area, creating an area to be zoomed; according to a center point of the area to be zoomed and the center point of the screen, acquiring the distance required to be moved; determining a zooming scale; according to the distance required to be moved, acquiring a translation matrix, and according to the zooming scale, generating a zooming matrix; according to the translation matrix and the zooming matrix, moving and zooming the screenshot picture corresponding to the area to be zoomed. Quick screenshot is realized by directly reading the data in frame-buffer memory, and an instantaneous frame in a video play can be acquired; the area to be zoomed and the zooming scale are automatically created according to the enclosing area and the screen parameters, the screenshot picture is automatically moved and zoomed, and is displayed at the middle position of the screen, and any interface can be zoomed.
Description
[technical field]
The present invention relates to smart machine field, particularly a kind of circle based on Android selects Zoom method and system.
[background technology]
Android is a kind of based on the freedom of Linux and the operating system of open source code, has now been applied on a large scale on the smart machine such as smart mobile phone, panel computer.And its function of the existing smart machine based on Android is also become stronger day by day, such as Intelligent flat equipment, possess and write, annotations and comments, drawing, the functions such as multimedia recreation, incorporate man-machine interaction, flat pannel display, the multinomial technology such as multimedia signal processing and Internet Transmission, handle official business in the information age, teaching, the preferred solution of picture and text interactive demonstration, the existing Intelligent flat equipment based on Android is when classroom or conference scenario use, due to the picture of display, word or video pictures too small, the student sat in the back row or staff often do not see the content on Chu's screen, the content to screen shows now just is needed to amplify.
[summary of the invention]
Based on this, the present invention, for solving the problems of the prior art, provides a kind of circle based on Android to select Zoom method.
The content of the embodiment of the present invention is as follows:
Circle based on Android selects a Zoom method, comprises the steps:
After receiving triggering command, read the data corresponding with current screen interface in frame buffer memory, be presented on screen according to this data genaration screenshot picture;
Monitor screen touch event, generate circle favored area;
Build according to screen parameter and described circle favored area and treat zoom area;
Treat the central point of zoom area and the central point of screen according to described, obtaining need the distance of movement; Zoom area and described screen parameter determination scaling is treated according to described; The distance of movement need generate translation matrix according to described, generate scaled matrix according to described scaling;
Treat screenshot picture corresponding to zoom area according to described translation matrix and described scaled matrix to carry out moving and convergent-divergent.
Accordingly, the embodiment of the present invention additionally provides a kind of circle based on Android and selects panntographic system, comprising:
Screen capture module, for after receiving triggering command, read the data corresponding with current screen interface in frame buffer memory, is presented on screen according to this data genaration screenshot picture;
Circle modeling block, for monitoring screen touch event, generates circle favored area;
Treating that zoom area builds module, treating zoom area for building according to screen parameter and described circle favored area;
Matrix generation module, for the central point of the central point and screen for the treatment of zoom area described in basis, obtaining need the distance of movement; Zoom area and described screen parameter determination scaling is treated according to described; The distance of movement need generate translation matrix according to described, generate scaled matrix according to described scaling;
Mobile Zoom module, carries out mobile convergent-divergent for treating screenshot picture corresponding to zoom area according to described translation matrix and described scaled matrix.
Beneficial effect of the present invention is: the present invention, by directly reading the data in Android frame buffer, realizes quick screenshotss, can obtain the instantaneous picture in video playback; Automatically build according to circle favored area and screen parameter the region and scaling that need to amplify, automatically carry out mobile convergent-divergent and be presented at screen centre position, realizing the convergent-divergent of arbitrary interface.
[accompanying drawing explanation]
Fig. 1 is the schematic flow sheet selecting Zoom method in the embodiment of the present invention based on the circle of Android;
Fig. 2 is the screenshotss process schematic in the embodiment of the present invention;
Fig. 3 is a kind of schematic diagram generating the method for circle favored area in the embodiment of the present invention;
Fig. 4 is a kind of schematic flow sheet treating zoom area construction method in the embodiment of the present invention;
Fig. 5 is the structural representation selecting panntographic system in the embodiment of the present invention based on the circle of Android;
Fig. 6 treats in the embodiment of the present invention that zoom area builds a kind of structural representation of module.
[embodiment]
Below in conjunction with specific embodiment, content of the present invention is described in detail.Although it is pointed out that the amplification only for picture in embodiment described below is illustrated, apply method of the present invention, reducing of arbitrary interface can be realized equally.
As shown in Figure 1, a kind of circle based on Android selects Zoom method, comprises the steps:
S100, after receiving triggering command, reads the data corresponding with current screen interface in frame buffer memory, is presented on screen according to this data genaration screenshot picture;
S200 monitors screen touch event, generates circle favored area;
S300 builds according to screen parameter and described circle favored area and treats zoom area;
S400 according to described in treat the central point of zoom area and the central point of screen, obtaining need the distance of movement; Zoom area and described screen parameter determination scaling is treated according to described; The distance of movement need generate translation matrix according to described, generate scaled matrix according to described scaling;
S500 treats screenshot picture corresponding to zoom area according to described translation matrix and described scaled matrix and carries out moving and convergent-divergent.
Concrete, after receiving triggering command, first carry out screenshotss operation.Described triggering command can come from two kinds of modes, one tackled this message before Android ccf layer (framework) PhoneWindowManager (Android window management) issues upper layer application, prevents press key message from being tackled by upper level applications.Intercept circle select zoom button message after triggering following screenshotss operation; Another mode is provided with floating apparatus on screen, and floating apparatus comprises floating ring and selects zoom button, and that monitors that floating ring selects zoom button presses event, when receiving this and pressing event, and the screenshotss operation of triggering following.Above-mentioned two kinds of desirable one of triggering mode or be combined.
Screenshotss operation in the present embodiment is based on frame buffer memory (Frame Buffer), and Fig. 2 is the screenshotss process schematic in the present embodiment.Frame buffer memory (hereinafter referred to as frame buffer) is a direct map of picture shown by screen, is also called bit map (Bit Map) or grating.A pixel on the corresponding screen of each storage unit of frame buffer, the corresponding two field picture of whole frame buffer.Image information in Android device is all write screen by frame buffer and is got on, therefore the raw pixel data inlet flow in frame buffer is read, these inlet flow data are read in original pixels array, again this original pixels array is converted to color data needed for current Android device screen (such as by raw data that rgb565 encodes, be converted into the data bitmap of rgb888 coding), Bit Map is created according to screen aspect, be set to the data bitmap of picture control imageView and show in the screen the superiors, realize freezing efficiency, deception human vision, allow spectators think is in original interface always.
After screenshotss, obtain the circle election action of user, namely monitor screen touch event, generate circle favored area according to the touch action of user's finger.Concrete, the present embodiment provides a kind of method generating circle favored area, and Fig. 3 is the schematic flow sheet of the method.When listening to user's finger and pressing (MotionEvent.ACTION_DOWN), the drafting rectangle method (canvas.drawRect) calling Android painting canvas in the drawing practice (onDraw) of imageView draws rectangle, when listening to the coordinate changing rectangle when user points mobile (MotionEvent.ACTION_MOVE), the refreshing control method (invalidate) calling imageView redraws control, draws rectangle; When listening to user's finger and leaving, generate circle favored area according to the final rectangle drawn, and rectangle is removed from interface.
After obtaining circle favored area, automatically construct according to screen parameter and circle favored area and treat zoom area, its object is to prevent scaling pictures from causing stretcher strain, ensure the true of image zooming.Wherein, described screen parameter comprises screen length, screen width and screen aspect ratio, and the interface that can be provided by Android obtains.Build and ensure to treat that the length breadth ratio of zoom area is consistent with screen aspect ratio when zoom area, limit maximum magnification ratio.In other words, undistorted after ensureing amplification.
In one embodiment, can adopt as shown in Figure 4 treat zoom area construction method.The method comprises the steps:
S301 obtains the length of described circle favored area, width and length breadth ratio, enters S302;
S302 judges whether the length breadth ratio of described circle favored area is greater than screen aspect ratio; If so, then S303 is entered; If not, then S304 is entered;
S303 using the length of described circle favored area as the described preselected length treating zoom area, using the length of described circle favored area divided by screen aspect ratio as the described preselected width treating zoom area, enter S305;
The width of described circle favored area is multiplied by screen aspect ratio as the described preselected length treating zoom area by S304, using the width of described circle favored area as the described preselected width treating zoom area, enters S305;
Divided by described, screen width is treated that the preselected width of zoom area obtains multiple to be amplified by S305, or divided by described, screen length is treated that the preselected length of zoom area obtains multiple to be amplified, judges whether described multiple to be amplified is greater than maximum amplification; If so, then S306 is entered; If not, then S307 is entered;
S306 using screen length divided by described maximum amplification as the described length treating zoom area, using screen width divided by described maximum amplification as the described width treating zoom area, enter S308;
Using described, S307 treats that the preselected length of zoom area is as the described length treating zoom area, treat that the preselected width of zoom area is as the described width treating zoom area, enters S308 using described;
S308, using the central point of described circle favored area as the described central point treating zoom area, treats zoom area described in building according to described length, width and the central point treating zoom area.
In the above-mentioned methods, that finally determines treats that the length breadth ratio of zoom area is consistent with screen aspect ratio, to ensure not stretch, and limit magnification ratio, undistorted after ensureing amplification, and that is finally determined by said method treats that zoom area is not less than circle favored area, ensure that four corner user being enclosed to choosing amplifies and ensures that central point is constant.
After determining to treat zoom area, the picture treating zoom area corresponding by the mode of matrixing amplifies.First according to central point and the screen center's point for the treatment of zoom area, carry out coordinate to subtract each other, drawing need the distance of movement, again according to treating zoom area and screen parameter determination scaling, in this example, in order to treat that the picture of zoom area is amplified to full screen display, therefore, by screen width divided by the width treating zoom area, or by screen length divided by the length treating zoom area, scaling can be obtained.Adopt prior art, translation matrix is generated by needing the distance of translation, scaled matrix is generated by scaling, the method (canvas.drawBitmap) of being drawn picture by data bitmap of Android painting canvas is called in the drawing practice (onDraw) of picture control imageView, calculate the coordinate points post-plot after change residing for each pixel of image according to translation matrix and scaled matrix, thus achieve and utilize matrix to change mobile and scaling pictures.
The circle based on Android in the embodiment of the present invention selects in Zoom method and carries out screenshotss by the direct data read in Android frame buffer, screenshotss speed is fast, efficiency is high, the instantaneous picture in also amplified video broadcasting can be intercepted, and vision deception can be realized by screenshotss, allow spectators take for follow-up zoom operations and be in original interface always; The present invention automatically builds according to circle favored area and screen parameter and treats zoom area, undistorted after ensureing image zooming, automatically carries out mobile convergent-divergent and is presented at screen centre position.Adopt the convergent-divergent that method of the present invention can realize Android smart machine arbitrary interface.
Present invention also offers a kind of circle based on Android and select panntographic system, as shown in Figure 5, comprising:
Screen capture module 100, for after receiving triggering command, read the data corresponding with current screen interface in frame buffer memory, is presented on screen according to this data genaration screenshot picture;
Circle modeling block 200, for monitoring screen touch event, generates circle favored area;
Treating that zoom area builds module 300, treating zoom area for building according to screen parameter and described circle favored area;
Matrix generation module 400, for the central point of the central point and screen for the treatment of zoom area described in basis, obtaining need the distance of movement; Zoom area and screen parameter determination scaling is treated according to described; The distance of movement need generate translation matrix according to described, generate scaled matrix according to described scaling;
Mobile Zoom module 500, carries out mobile convergent-divergent for treating screenshot picture corresponding to zoom area according to described translation matrix and described scaled matrix.
Circle of the present invention selects panntographic system also can comprise trigger module, in one embodiment, described trigger module comprises circle and selects zoom button trigger mode, Android framework (ccf layer) selects zoom button message by interceptkeyBeforeDispathing (before Distribution Events interception button) the method interception circle of PhoneWindowManager (Android window management), before press key message is distributed to upper layer application by Android, tackles this press key message, prevents this press key message from being tackled by upper level applications.After intercepting this press key message, call Android startActivity (opening application) method and trigger screen capture module 100.
In another embodiment, described trigger module comprises floating ring and selects zoom button trigger module, press event for what monitor that floating ring selects zoom button, when pressing event described in receiving, calling Android startActivity method and triggering screen capture module 100.
Above-mentioned two kinds of embodiments can be combined or get one.
In the present embodiment, the screenshotss operation of screen capture module 100 is based on frame buffer memory (Frame Buffer), screen capture module 100 reads the raw pixel data inlet flow in frame buffer, these inlet flow data are read in original pixels array, again this original pixels array is converted to color data needed for current Android device screen (such as by raw data that rgb565 encodes, be translated into the data bitmap of rgb888 coding), length and width again in conjunction with screen create Bit Map, are set to the data bitmap of picture control imageView and show in the screen the superiors.
After screenshotss, circle modeling block 200 obtains the circle election action of user, namely monitors screen touch event, generates circle favored area according to the touch action of user's finger.In one embodiment, circle modeling block 200 is when listening to user's finger and pressing (MotionEvent.ACTION_DOWN), the drafting rectangle method (canvas.drawRect) calling Android painting canvas in the graphing method (onDraw) of control View draws rectangle, when listening to the coordinate changing rectangle when user points mobile (MotionEvent.ACTION_MOVE), the refreshing control method (invalidate) calling view redraws control, draws rectangle; When listening to user's finger and leaving, generate circle favored area according to the final rectangle drawn, and rectangle is removed from interface.
After obtaining circle favored area, treat that zoom area structure module 300 constructs automatically according to screen parameter and circle favored area and treat zoom area, its object is to prevent scaling pictures from causing stretcher strain, ensure the true of image zooming.Wherein, described screen parameter comprises screen length, screen width and screen aspect ratio, and the interface that can be provided by Android obtains.Build and ensure to treat that the length breadth ratio of zoom area is consistent with screen aspect ratio when zoom area, limit maximum magnification ratio.In other words, undistorted after ensureing amplification.
As shown in Figure 6, in one embodiment, treat that zoom area builds module 300 and comprises:
Acquisition module 301, for obtaining the length of described circle favored area, width and length breadth ratio;
First judge module 302, for judging the described length breadth ratio of circle favored area and the size of screen aspect ratio;
First computing module 303, for treating preselected length and the preselected width of zoom area described in calculating, and calculates multiple to be amplified; If the length breadth ratio of described circle favored area is greater than screen aspect ratio, then treat described in that the preselected length of zoom area equals the length of described circle favored area, described in treat that the preselected width of zoom area equals the length of described circle favored area divided by screen aspect ratio; If the length breadth ratio of described circle favored area is less than or equal to screen aspect ratio, then treat described in that the width that the preselected length of zoom area equals described circle favored area is multiplied by screen aspect ratio, described in treat that the preselected width of zoom area equals the width of described circle favored area; By screen width divided by the described preselected width treating zoom area, or by screen length divided by the described preselected length treating zoom area, obtain multiple to be amplified;
Second judge module 304, for judging the size of described multiple to be amplified and maximum amplification;
Second computing module 305, for treating length and the width of zoom area described in calculating; If described multiple to be amplified is greater than described maximum amplification, then treat described in that the length of zoom area equals screen length divided by described maximum amplification, described in treat that the width of zoom area equals screen width divided by described maximum amplification; If described multiple to be amplified is less than or equal to described maximum amplification, then treat described in that the length of zoom area equals preselected length, described in treat that the width of zoom area equals preselected width;
Generation module 306, for the central point of described circle favored area for described in treat the central point of zoom area, treat zoom area described in building according to described length, width and the central point treating zoom area.
Treat that zoom area builds module 300 and determines final to treat zoom area by above-mentioned, this treats that the length breadth ratio of zoom area is consistent with screen aspect ratio, to ensure not stretch, and limit magnification ratio, ensure to amplify rear picture undistorted, and by this treat zoom area build module 300 finally determine treat that zoom area is not less than circle favored area, ensure that four corner user being enclosed to choosing amplifies and ensures that central point is constant.
After determining to treat zoom area, the central point and screen center's point for the treatment of zoom area are carried out coordinate and subtract each other by matrix generation module 400, drawing need the distance of movement, again according to treating zoom area and screen parameter determination scaling, in one embodiment, in order to treat that the picture of zoom area is amplified to full screen display, screen width is treated the width of zoom area by matrix generation module 400 described in being obtained by described second computing module, or by screen length divided by the length treating zoom area, obtain scaling.By needing the distance of translation to generate translation matrix, generate scaled matrix by scaling.Mobile Zoom module 500 calls the method (canvas.drawBitmap) of being drawn picture by data bitmap of Android painting canvas in the drawing practice (onDraw) of picture control imageView, calculate the coordinate points post-plot after change residing for each pixel of image according to translation matrix and scaled matrix, thus achieve and utilize matrix to change mobile and scaling pictures.
Circle in the embodiment of the present invention selects the realization of its each function of panntographic system to can refer to above-mentioned method, no longer repeats herein.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. the circle based on Android selects a Zoom method, it is characterized in that, comprises the steps:
After receiving triggering command, read the data corresponding with current screen interface in frame buffer memory, be presented on screen according to this data genaration screenshot picture;
Monitor screen touch event, generate circle favored area;
Build according to screen parameter and described circle favored area and treat zoom area;
Treat the central point of zoom area and the central point of screen according to described, obtaining need the distance of movement; Zoom area and described screen parameter determination scaling is treated according to described; The distance of movement need generate translation matrix according to described, generate scaled matrix according to described scaling;
Treat screenshot picture corresponding to zoom area according to described translation matrix and described scaled matrix to carry out moving and convergent-divergent.
2. the circle based on Android according to claim 1 selects Zoom method, it is characterized in that, the process of described monitoring screen touch event, generation circle favored area comprises the steps:
When listening to user's finger and pressing, draw rectangle;
When listening to user and pointing mobile, change the coordinate of described rectangle, repaint rectangle, until listen to user's finger when leaving, generate circle favored area according to the rectangle repainted.
3. the circle based on Android according to claim 2 selects Zoom method, it is characterized in that, described structure according to screen parameter and described circle favored area treats that the process of zoom area comprises the steps:
Obtain the length of described circle favored area, width and length breadth ratio;
According to the described length breadth ratio of circle favored area and the size of screen aspect ratio, described in judgement, treat preselected length and the preselected width of zoom area;
If the length breadth ratio of described circle favored area is greater than screen aspect ratio, then treat described in that the preselected length of zoom area equals the length of described circle favored area, described in treat that the preselected width of zoom area equals the length of described circle favored area divided by screen aspect ratio; If the length breadth ratio of described circle favored area is less than or equal to screen aspect ratio, then treat described in that the width that the preselected length of zoom area equals described circle favored area is multiplied by screen aspect ratio, described in treat that the preselected width of zoom area equals the width of described circle favored area;
By screen width divided by the described preselected width treating zoom area, or by screen length divided by the described preselected length treating zoom area, obtain multiple to be amplified, according to the size of described multiple to be amplified and maximum amplification, judge length and the width for the treatment of zoom area;
If described multiple to be amplified is greater than described maximum amplification, then treat described in that the length of zoom area equals screen length divided by described maximum amplification, described in treat that the width of zoom area equals screen width divided by described maximum amplification; If described multiple to be amplified is less than or equal to described maximum amplification, then treat described in that the length of zoom area equals preselected length, described in treat that the width of zoom area equals preselected width;
With the central point of described circle favored area for described in treat the central point of zoom area, treat zoom area described in building according to described length, width and the central point treating zoom area.
4. the circle based on Android according to claim 3 selects Zoom method, it is characterized in that, treats that the process of zoom area and described screen parameter determination scaling comprises the steps: according to described
By screen width divided by the described width treating zoom area, or by screen length divided by the described length treating zoom area, obtain scaling.
5. the circle based on Android according to any one of claim 1 to 4 selects Zoom method, it is characterized in that, also comprises the steps:
Intercept after circle selects zoom button message at Android ccf layer and judge to receive described triggering command;
And/or
That monitors that floating ring selects zoom button presses event, when pressing event described in receiving, judges to receive described triggering command.
6. the circle based on Android selects a panntographic system, it is characterized in that, comprising:
Screen capture module, for after receiving triggering command, read the data corresponding with current screen interface in frame buffer memory, is presented on screen according to this data genaration screenshot picture;
Circle modeling block, for monitoring screen touch event, generates circle favored area;
Treating that zoom area builds module, treating zoom area for building according to screen parameter and described circle favored area;
Matrix generation module, for the central point of the central point and screen for the treatment of zoom area described in basis, obtaining need the distance of movement; Zoom area and screen parameter determination scaling is treated according to described; The distance of movement need generate translation matrix according to described, generate scaled matrix according to described scaling;
Mobile Zoom module, carries out mobile convergent-divergent for treating screenshot picture corresponding to zoom area according to described translation matrix and described scaled matrix.
7. the circle based on Android according to claim 6 selects panntographic system, it is characterized in that, described circle modeling block is when listening to user's finger and pressing, draw rectangle, when listening to user and pointing mobile, change the coordinate of described rectangle, and repaint and make rectangle, until listen to user's finger when leaving, generate circle favored area according to the rectangle repainted.
8. the circle based on Android according to claim 7 selects panntographic system, it is characterized in that, described in treat zoom area build module comprise:
Acquisition module, for obtaining the length of described circle favored area, width and length breadth ratio;
First judge module, for judging the described length breadth ratio of circle favored area and the size of screen aspect ratio;
First computing module, for treating preselected length and the preselected width of zoom area described in calculating, and calculates multiple to be amplified; If the length breadth ratio of described circle favored area is greater than screen aspect ratio, then treat described in that the preselected length of zoom area equals the length of described circle favored area, described in treat that the preselected width of zoom area equals the length of described circle favored area divided by screen aspect ratio; If the length breadth ratio of described circle favored area is less than or equal to screen aspect ratio, then treat described in that the width that the preselected length of zoom area equals described circle favored area is multiplied by screen aspect ratio, described in treat that the preselected width of zoom area equals the width of described circle favored area; By screen width divided by the described preselected width treating zoom area, or by screen length divided by the described preselected length treating zoom area, obtain multiple to be amplified;
Second judge module, for judging the size of described multiple to be amplified and maximum amplification;
Second computing module, for treating length and the width of zoom area described in calculating; If described multiple to be amplified is greater than described maximum amplification, then treat described in that the length of zoom area equals screen length divided by described maximum amplification, described in treat that the width of zoom area equals screen width divided by described maximum amplification; If described multiple to be amplified is less than or equal to described maximum amplification, then treat described in that the length of zoom area equals preselected length, described in treat that the width of zoom area equals preselected width;
Generation module, for the central point of described circle favored area for described in treat the central point of zoom area, treat zoom area described in building according to described length, width and the central point treating zoom area.
9. the circle based on Android according to claim 8 selects panntographic system, it is characterized in that, by described matrix generation module, by screen width divided by the width treating zoom area described in being calculated by described second computing module, or by screen length divided by the length treating zoom area described in being calculated by described second computing module, obtain scaling.
10. the circle based on Android according to any one of claim 6 to 9 selects panntographic system, it is characterized in that, also comprise trigger module, described trigger module comprises circle and selects zoom button trigger module, judge to receive described triggering command for intercepting at Android ccf layer after circle selects zoom button message, and/or comprise floating ring and select zoom button trigger module, event is pressed for what monitor that floating ring selects zoom button, when pressing event described in receiving, judge to receive described triggering command.
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