Android picture rotation, scaling, displacement, tilt, symmetry complete example (i)--imageview.setimagematrix (matrix) and matrix

Mainactivity as follows:

Import Android.os.bundle;import Android.view.motionevent;import Android.view.view;import Android.view.view.ontouchlistener;import Android.widget.imageview;import Android.app.activity;import android.graphics.matrix;/** * Demo Description: * Use Mimageview.setimagematrix (Matrix) to achieve * image translation, scaling, rotation, tilt and symmetry * * Reference: * 0 http://b log.csdn.net/pathuang68/article/details/6991988 * 1 http://blog.csdn.net/mingli198611/article/details/7830633 * * Thank you very much */public class Mainactivity extends Activity {private Testmatriximageview mtestmatriximageview; @Ov errideprotected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); mtestmatriximageview= New Testmatriximageview (Mainactivity.this); Mtestmatriximageview.setscaletype (ImageView.ScaleType.MATRIX);//?? Mtestmatriximageview.setontouchlistener (New Touchlistenerimpl ()); Setcontentview (Mtestmatriximageview);} Private class Touchlistenerimpl implements ontouchlistener{@Overridepublic boolean OnTouch (View V, motionevent event) { if (EVEnt.getaction () ==motionevent.action_up) {//1 test pan testtranslate ();//2 test rotates//testrotate () around the center point of the picture;//3 test rotates around the origin and pans// Testrotateandtranslate ();//4 scale//testscale ()//5 horizontal Tilt//testskewx ()//6 vertical Tilt//testskewy ()//7 horizontal and vertical tilt//testskewxy () ;//8 horizontal symmetrical//testsymmetryx ();//9 vertical symmetry//testsymmetryy ();//10 about x=y symmetry//testsymmetryxy ();} return true;}} Translate private void Testtranslate () {Matrix matrix=new matrix (); int Width=mtestmatriximageview.getbitmap (). GetWidth (); int Height=mtestmatriximageview.getbitmap (). GetHeight (); matrix.posttranslate (width, height); Mtestmatriximageview.setimagematrix (matrix); Showmatrixeveryvalue (matrix);} Rotates the private void testrotate () {Matrix matrix=new matrix (), int width=mtestmatriximageview.getbitmap (), around the center point of the picture. GetWidth (); int Height=mtestmatriximageview.getbitmap (). GetHeight (); Matrix.postrotate (45f, WIDTH/2, HEIGHT/2); Matrix.posttranslate (width, height); Mtestmatriximageview.setimagematrix (matrix); Showmatrixeveryvalue (matrix);} Pan around the origin and//note the following three lines of code execution order://matrix.setrotate (45f);//matrix.pretranslAte (-width,-height);//matrix.posttranslate (width, height);//Perform matrix.pretranslate (-width,-height);// After execution matrix.setrotate (45f);//Perform matrix.posttranslate (width, height);p rivate void Testrotateandtranslate () {Matrix Matrix = new Matrix (), int width = Mtestmatriximageview.getbitmap (). getwidth (); int height = Mtestmatriximageview.getbitmap (). GetHeight (); matrix.setrotate (45f); Matrix.pretranslate (-width,-height); Matrix.posttranslate (width, height); Mtestmatriximageview.setimagematrix (matrix); Showmatrixeveryvalue (matrix);} Scale private void Testscale () {Matrix matrix = new Matrix (); Matrix.setscale (0.5f, 0.5f); Mtestmatriximageview.setimagematrix (matrix); Showmatrixeveryvalue (matrix);} Horizontal tilt private void testskewx () {Matrix matrix = new Matrix (); Matrix.setskew (0.5f, 0); Mtestmatriximageview.setimagematrix (matrix); Showmatrixeveryvalue (matrix);} Vertical tilt private void Testskewy () {Matrix matrix = new Matrix (); Matrix.setskew (0, 0.5f); Mtestmatriximageview.setimagematrix (matrix); Showmatrixeveryvalue (matrix);}Horizontal and vertical tilt private void Testskewxy () {Matrix matrix = new Matrix (); Matrix.setskew (0.5f, 0.5f); Mtestmatriximageview.setimagematrix (matrix); Showmatrixeveryvalue (matrix);} Horizontal symmetry--Pictures about x axisymmetric private void Testsymmetryx () {Matrix matrix = new Matrix (); int height = Mtestmatriximageview.getbitmap () . GetHeight (); float matrixvalues[] = {1f, 0f, 0f, 0f, -1f, 0f, 0f, 0f, 1f};matrix.setvalues (matrixvalues);//If Matrix.post Translate (0, height);//indicates that the picture is upside down matrix.posttranslate (0, height*2); Mtestmatriximageview.setimagematrix (matrix); Showmatrixeveryvalue (matrix);} Vertical symmetry--picture about y axisymmetric private void Testsymmetryy () {Matrix matrix = new Matrix (); int Width=mtestmatriximageview.getbitmap (). GetWidth (); float matrixvalues[] = { -1f, 0f, 0f, 0f, 1f, 0f, 0f, 0f, 1f};matrix.setvalues (matrixvalues);//If Matrix.posttra Nslate (width,0);//show the picture left and right upside down Matrix.posttranslate (width*2, 0); Mtestmatriximageview.setimagematrix (matrix); Showmatrixeveryvalue (matrix);} About X=y symmetry--Pictures about x=y axisymmetric private void Testsymmetryxy () {Matrix matrix = new MatRix (); int width = Mtestmatriximageview.getbitmap (). getwidth (); int height = Mtestmatriximageview.getbitmap (). GetHeight (); float matrixvalues[] = {0f, -1f, 0f, -1f, 0f, 0f, 0f, 0f, 1f};matrix.setvalues (matrixvalues); Matrix.posttran Slate (Width+height, width+height); Mtestmatriximageview.setimagematrix (matrix); Showmatrixeveryvalue (matrix);} Gets the transform matrix for each value in matrix private void Showmatrixeveryvalue (Matrix matrix) {float matrixvalues []=new float[9]; Matrix.getvalues (matrixvalues); for (int i = 0; I <3; i++) {String valuestring= "", for (int j = 0; J < 3; J + +) {ValueS Tring=matrixvalues[3*i+j]+ ""; System.out.println ("+ (i+1) +" column with the value of "+ (j+1) +" = "+valuestring");}}}

Testmatriximageview as follows:

Package Cn.testmatrix;import Android.content.context;import Android.graphics.bitmap;import Android.graphics.bitmapfactory;import Android.graphics.canvas;import Android.graphics.matrix;import android.widget.imageview;/** * Summary: * executed in mainactivity: * Mtestmatriximageview.setimagematrix (Matrix); * This custom view will call Setimagematrix (Matrix matrix) * and then call OnDraw (Canvas canvas) */public class Testmatriximageview extends    Imageview{private Matrix Mmatrix; Private Bitmap Mbitmap;public Testmatriximageview (context context) {super (context); mmatrix=new Matrix (); mbitmap= Bitmapfactory.decoderesource (Getresources (), R.drawable.icon);} @Overrideprotected void OnDraw (canvas canvas) {SYSTEM.OUT.PRINTLN ("---> onDraw");//Painting the original Canvas.drawbitmap (Mbitmap, 0, 0, NULL);//Draw after Matrix changed figure Canvas.drawbitmap (Mbitmap, Mmatrix, null); Super.ondraw (canvas);} @Overridepublic void Setimagematrix (Matrix matrix) {SYSTEM.OUT.PRINTLN ("---> Setimagematrix"); This.mMatrix.set ( Matrix); Super.setimagematrix (matrix);} Public Bitmap GetbiTMap () {System.out.println ("---> getbitmap"); return mbitmap;}} 

Main.xml as follows:

<relativelayout xmlns:android= "http://schemas.android.com/apk/res/android"    xmlns:tools= "http// Schemas.android.com/tools "    android:layout_width=" match_parent "    android:layout_height=" Match_parent "    >    <textview        android:layout_width= "wrap_content"        android:layout_height= "Wrap_content"        android:text= "@string/hello_world"/></relativelayout>