android canvas画图 切割画布（clipRect）

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

Java代码

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105. importandroid.content.Context; importandroid.graphics.Canvas; importandroid.graphics.Color; importandroid.graphics.Paint; importandroid.graphics.Path; importandroid.graphics.Region; importandroid.util.AttributeSet; importandroid.view.View; publicclasssBookextendsView{ ContextmContext; PaintmPaint; PathmPath; publicsBook(Contextcontext){ super(context); init(); } publicsBook(Contextcontext,AttributeSetattrs){ super(context,attrs); init(); } publicsBook(Contextcontext,AttributeSetattrs,intdefStyle){ super(context,attrs,defStyle); init(); } privatevoidinit(){ mPaint=newPaint(); mPaint.setAntiAlias(true); mPaint.setStrokeWidth(6); mPaint.setTextSize(16); mPaint.setTextAlign(Paint.Align.RIGHT); mPath=newPath(); } protectedvoidonDraw(Canvascanvas){ 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.XOR); drawScene(canvas); canvas.restore(); canvas.save(); canvas.translate(10,160); mPath.reset(); //canvas.clipPath(mPath);//makestheclipempty //mPath.addCircle(50,50,50, W); mPath.cubicTo(0,0,100,0,100,100); mPath.cubicTo(100,100,0,100,0,0); 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(); } privatevoiddrawScene(Canvascanvas){ 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); } }

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