2011.10.10（2）——— android Clipping关于剪切

2011.10.11（2）——— android Clipping关于剪切

参考： http://wenku.baidu.com/view/67e1eed026fff705cc170ac1.html

代码如下：

package com.lp.clip;import android.app.Activity;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Path;import android.graphics.Region;import android.os.Bundle;import android.view.View;public class Clipping extends Activity {    @Override    protected 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();        }    }}

解释如下：

canvas.translate(160, 310);

表示移动原点坐标

所以可以看出来每次绘图都是有两次的剪切方法的

运行结果如下：

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