Android 图片的平移、缩放、倒影、旋转实现

缩放、倒影、旋转实现"/>

Android 图片的平移、缩放、倒影、旋转实现

解析：
1）根据原来的图片创建新的图片
Bitmap modBm = Bitmap.createBitmap(bm.getWidth()+20, bm.getHeight()+20, bm.getConfig());
2）设置到画布
Canvas canvas = new Canvas(modBm);
3）使用矩阵进行平移…
Matrix matrix = new Matrix();
matrix.setRotate(90, bm.getWidth()/2, bm.getHeight()/2);
4）把改变后图片设置到
canvas.drawBitmap(bm, matrix, paint);
imageView2.setImageBitmap(modBm);

示例代码：
1、平移：

public class TranslateImageActivity extends Activity {private ImageView imageView1;private ImageView imageView2;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_image_rotate);initViews();}private void initViews() {imageView1 = (ImageView) findViewById(R.id.imageView1);imageView2 = (ImageView) findViewById(R.id.imageView2);Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.mm0);imageView1.setImageBitmap(bm);Bitmap modBm = Bitmap.createBitmap(bm.getWidth()+20, bm.getHeight()+20, bm.getConfig());Canvas canvas = new Canvas(modBm);Paint paint = new Paint();paint.setColor(Color.BLACK);paint.setAntiAlias(true);Matrix matrix = new Matrix();//matrix.setRotate(90, bm.getWidth()/2, bm.getHeight()/2);matrix.setTranslate(20, 20);matrix.postTranslate(20, 20);canvas.drawBitmap(bm, matrix, paint);imageView2.setImageBitmap(modBm);}
}

2、缩放

public class ScaleImageActivity extends BaseActivity {private static final int DOUBLE = 2;private ImageView iv1, iv2;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_scale_iamge);iv1 = (ImageView) findViewById(R.id.imageView1);iv2 = (ImageView) findViewById(R.id.imageView2);Bitmap b1 = BitmapFactory.decodeResource(getResources(), R.drawable.p1);iv1.setImageBitmap(b1);Bitmap b2 = Bitmap.createBitmap(b1.getWidth()*DOUBLE, b1.getHeight(), Config.ARGB_8888);Canvas canvas = new Canvas(b2);Matrix matrix = new Matrix();matrix.setValues(new float[]{DOUBLE * 1.0f, 0,       0,//x0,             1.0f,    0,//y0,             0,       1.0f//z});canvas.drawBitmap(b1, matrix, new Paint());iv2.setImageBitmap(b2);}
}

3、倒影

public class ShadeImageActivity extends Activity {private ImageView imageView1;private ImageView imageView2;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_image_rotate);initViews();}private void initViews() {imageView1 = (ImageView) findViewById(R.id.imageView1);imageView2 = (ImageView) findViewById(R.id.imageView2);Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.mm3);imageView1.setImageBitmap(bm);Bitmap modBm = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(), bm.getConfig());Canvas canvas = new Canvas(modBm);Paint paint = new Paint();paint.setColor(Color.BLACK);paint.setAntiAlias(true);Matrix matrix = new Matrix();//matrix.setRotate(90, bm.getWidth()/2, bm.getHeight()/2);//matrix.setTranslate(20, 20);//镜子效果matrix.setScale(1, -1);matrix.postTranslate(0, bm.getHeight());canvas.drawBitmap(bm, matrix, paint);imageView2.setImageBitmap(modBm);}
}

4、旋转

public class RotateImageActivity extends Activity {private ImageView imageView1;private ImageView imageView2;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_image_rotate);initViews();}private void initViews() {imageView1 = (ImageView) findViewById(R.id.imageView1);imageView2 = (ImageView) findViewById(R.id.imageView2);Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.mm0);imageView1.setImageBitmap(bm);Bitmap modBm = Bitmap.createBitmap(bm.getWidth(), bm.getHeight(), bm.getConfig());Canvas canvas = new Canvas(modBm);Paint paint = new Paint();paint.setColor(Color.BLACK);paint.setAntiAlias(true);Matrix matrix = new Matrix();matrix.setRotate(90, bm.getWidth()/2, bm.getHeight()/2);canvas.drawBitmap(bm, matrix, paint);imageView2.setImageBitmap(modBm);}
}

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