MainActivity如下:
- 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描述:
- * 利用mImageView.setImageMatrix(matrix)实现
- * 图片的平移,缩放,旋转,倾斜以及对称
- *
- * 参考资料:
- * 0 http://blog.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;
- @Override
- protected 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{
- @Override
- public boolean onTouch(View v, MotionEvent event) {
- if (event.getAction()==MotionEvent.ACTION_UP) {
- //1 测试平移
- testTranslate();
- //2 测试围绕图片中心点旋转
- //testRotate();
- //3 测试围绕原点旋转后平移
- //testRotateAndTranslate();
- //4 缩放
- //testScale();
- //5 水平倾斜
- //testSkewX();
- //6 垂直倾斜
- //testSkewY();
- //7 水平且垂直倾斜
- //testSkewXY();
- //8 水平对称
- //testSymmetryX();
- //9 垂直对称
- //testSymmetryY();
- //10 关于X=Y对称
- //testSymmetryXY();
- }
- return true;
- }
- }
- //平移
- 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);
- }
- //围绕图片中心点旋转
- private void testRotate(){
- Matrix matrix=new Matrix();
- int width=mTestMatrixImageView.getBitmap().getWidth();
- int height=mTestMatrixImageView.getBitmap().getHeight();
- matrix.postRotate(45f, width/2, height/2);
- matrix.postTranslate(width, height);
- mTestMatrixImageView.setImageMatrix(matrix);
- showMatrixEveryValue(matrix);
- }
- //围绕原点旋转后平移
- //注意以下三行代码的执行顺序:
- //matrix.setRotate(45f);
- //matrix.preTranslate(-width, -height);
- //matrix.postTranslate(width, height);
- //先执行matrix.preTranslate(-width, -height);
- //后执行matrix.setRotate(45f);
- //再执行matrix.postTranslate(width, height);
- private 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);
- }
- //缩放
- private void testScale() {
- Matrix matrix = new Matrix();
- matrix.setScale(0.5f, 0.5f);
- mTestMatrixImageView.setImageMatrix(matrix);
- showMatrixEveryValue(matrix);
- }
- //水平倾斜
- private void testSkewX() {
- Matrix matrix = new Matrix();
- matrix.setSkew(0.5f, 0);
- mTestMatrixImageView.setImageMatrix(matrix);
- showMatrixEveryValue(matrix);
- }
- // 垂直倾斜
- private void testSkewY() {
- Matrix matrix = new Matrix();
- matrix.setSkew(0, 0.5f);
- mTestMatrixImageView.setImageMatrix(matrix);
- showMatrixEveryValue(matrix);
- }
- // 水平且垂直倾斜
- private void testSkewXY() {
- Matrix matrix = new Matrix();
- matrix.setSkew(0.5f, 0.5f);
- mTestMatrixImageView.setImageMatrix(matrix);
- showMatrixEveryValue(matrix);
- }
- // 水平对称--图片关于X轴对称
- 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);
- //若是matrix.postTranslate(0, height);
- //表示将图片上下倒置
- matrix.postTranslate(0, height*2);
- mTestMatrixImageView.setImageMatrix(matrix);
- showMatrixEveryValue(matrix);
- }
- // 垂直对称--图片关于Y轴对称
- 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);
- //若是matrix.postTranslate(width,0);
- //表示将图片左右倒置
- matrix.postTranslate(width*2, 0);
- mTestMatrixImageView.setImageMatrix(matrix);
- showMatrixEveryValue(matrix);
- }
- // 关于X=Y对称--图片关于X=Y轴对称
- 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.postTranslate(width+height, width+height);
- mTestMatrixImageView.setImageMatrix(matrix);
- showMatrixEveryValue(matrix);
- }
- //获取变换矩阵Matrix中的每个值
- 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++) {
- valueString=matrixValues[3*i+j]+"";
- System.out.println("第"+(i+1)+"行的第"+(j+1)+"列的值为"+valueString);
- }
- }
- }
- }
TestMatrixImageView如下:
- 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;
- /**
- * 总结:
- * 在MainActivity中执行:
- * mTestMatrixImageView.setImageMatrix(matrix);
- * 时此自定义View会先调用setImageMatrix(Matrix matrix)
- * 然后调用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);
- }
- @Override
- protected void onDraw(Canvas canvas) {
- System.out.println("---> onDraw");
- //画原图
- canvas.drawBitmap(mBitmap, 0, 0, null);
- //画经过Matrix变化后的图
- canvas.drawBitmap(mBitmap, mMatrix, null);
- super.onDraw(canvas);
- }
- @Override
- public 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如下:
- <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>