android clipPath切割画布

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转自：http://wallage.blog.163.com/blog/static/1738962420101012439991/）

[java]  view plain copy  
 public class PictureTestActivity extends Activity {  
    
        @Override  
        public void onCreate(Bundle savedInstanceState){  
            super.onCreate(savedInstanceState);  
            setContentView(new SampleView(this));  
        }  
         private static class SampleView extends View {  
             private Paint mPaint;  
             private Path mPath;  
             public SampleView(Context context) {  
                 super(context);  
                 setFocusable(true);  
                   
                 mPaint = new Paint();  
                 mPaint.setAntiAlias(true);  
                 mPaint.setStrokeWidth(6);  
                 mPaint.setTextSize(16);  
                 mPaint.setTextAlign(Paint.Align.RIGHT);  
                   
                 mPath = new Path();  
             }  
               
             private void drawScene(Canvas canvas) {  
                 canvas.clipRect(0, 0, 100, 100);  
                   
                 canvas.drawColor(Color.WHITE);  
                   
                 mPaint.setColor(Color.RED);  
                 canvas.drawLine(0, 0, 100, 100, mPaint);  
                   
                 mPaint.setColor(Color.GREEN);  
                 canvas.drawCircle(30, 70, 30, mPaint);  
                   
                 mPaint.setColor(Color.BLUE);  
                 canvas.drawText("Clipping", 100, 30, mPaint);  
             }  
               
             @Override   
             protected void onDraw(Canvas canvas) {  
                 canvas.drawColor(Color.GRAY);              
                 canvas.save();  
                 canvas.translate(10, 10);  
                 drawScene(canvas);  
                 canvas.restore();  
                   
                 canvas.save();  
                 canvas.translate(160, 10);  
                 canvas.clipRect(10, 10, 90, 90);  
                 canvas.clipRect(30, 30, 70, 70, Region.Op.DIFFERENCE);  
                 drawScene(canvas);  
                 canvas.restore();  
                   
                 canvas.save();  
                 canvas.translate(10, 160);  
                 mPath.reset();  
                 canvas.clipPath(mPath); // makes the clip empty  
                 mPath.addCircle(50, 50, 50, Path.Direction.CCW);  
                 canvas.clipPath(mPath, Region.Op.REPLACE);  
                 drawScene(canvas);  
                 canvas.restore();  
                   
                 canvas.save();  
                 canvas.translate(160, 160);  
                 canvas.clipRect(0, 0, 60, 60);  
                 canvas.clipRect(40, 40, 100, 100, Region.Op.UNION);  
                 drawScene(canvas);  
                 canvas.restore();  
                   
                 canvas.save();  
                 canvas.translate(10, 310);  
                 canvas.clipRect(0, 0, 60, 60);  
                 canvas.clipRect(40, 40, 100, 100, Region.Op.XOR);  
                 drawScene(canvas);  
                 canvas.restore();  
                   
                 canvas.save();  
                 canvas.translate(160, 310);  
                 canvas.clipRect(0, 0, 60, 60);  
                 canvas.clipRect(40, 40, 100, 100, Region.Op.REVERSE_DIFFERENCE);  
                 drawScene(canvas);  
                 canvas.restore();  
             }  
         }  
 }  

效果如图：

canvas.clipRect(30, 30, 70, 70, Region.Op.XOR);最后一个参数有多个选择分别是：

            //DIFFERENCE是第一次不同于第二次的部分显示出来
            //REPLACE是显示第二次的
            //REVERSE_DIFFERENCE 是第二次不同于第一次的部分显示
            //INTERSECT交集显示
            //UNION全部显示
            //XOR补集就是全集的减去交集生育部分显示

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