안 드 로 이 드 clipPath 캔버스 절단

(다음으로 이동:http://wallage.blog.163.com/blog/static/1738962420101012439991/）

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();
	        }
	    }
}

효과 그림:

canvas.clipRect(30, 30, 70, 70, Region.Op.XOR);마지막 매개 변 수 는 다음 과 같은 여러 가지 선택 이 있 습 니 다.
            //DIFFERENCE 는 두 번 째 와 다른 부분 이 처음 나 와 요.            //REPLACE 는 두 번 째 로 나 와 요.            //REVERSE_DIFFERENCE 는 두 번 째 로 첫 번 째 와 다른 부분 을 보 여 줍 니 다.            //INTERSECT 교차 표시            //UNION 모두 표시            //XOR 보 집 은 전집 의 교 집합 을 뺀 부분 입 니 다.