canvas.clipRect

来源：互联网发布：javascript 常用框架编辑：程序博客网时间：2024/06/08 06:56

clipRect(float left, float top, float right, float bottom)
Intersect the current clip with the specified rectangle, which is expressed in local coordinates.

只有在这个区域内的才显示，其他所有内容好像被裁剪掉了一样，不显示。

clipRect2

public void onDraw(Canvas canvas){super.onDraw(canvas);/* 设置画布的颜色 */canvas.drawColor(Color.BLACK);/* 设置取消锯齿效果 */mPaint.setAntiAlias(true);//mPaint.setStyle(Paint.Style.STROKE);mPaint.setColor(Color.RED);//canvas.save();// 设置裁剪区域//canvas.drawRect(new Rect(1, 1, 320, 400),mPaint);canvas.clipRect(40, 40, 280, 260);canvas.drawColor(Color.GRAY);/* 线锁定画布 */canvas.save();/* 旋转画布,顺时针旋转“画布”，以左上角为圆心 */canvas.rotate(45.0f);//canvas.drawRect(new Rect(40, 40, 280, 260),mPaint);/* 设置颜色及绘制矩形 */mPaint.setColor(Color.RED);canvas.drawRect(new Rect(45,45,140,100), mPaint);/* 解除画布的锁定 */canvas.restore();/* 设置颜色及绘制另一个矩形 */mPaint.setColor(Color.GREEN);canvas.drawRect(new Rect(150,75,260,120), mPaint);}

public void onDraw(Canvas canvas){super.onDraw(canvas);/* 设置画布的颜色 */canvas.drawColor(Color.BLACK);/* 设置取消锯齿效果 */mPaint.setAntiAlias(true);mPaint.setStyle(Paint.Style.STROKE);//空心，不填充mPaint.setColor(Color.RED);/* 线锁定画布 */canvas.save();//整个屏幕加个边框canvas.drawRect(new Rect(1, 1, 320, 400),mPaint);//这里不用clipRect，而改为drawRect，仅模拟裁剪的区域，而不真正裁剪canvas.drawRect(new Rect(40, 40, 280, 260),mPaint);/* 旋转画布 */canvas.rotate(45.0f);//旋转后的屏幕边框canvas.drawRect(new Rect(1, 1, 320, 400),mPaint);//裁剪框旋转后的weizhicanvas.drawRect(new Rect(40, 40, 280, 260),mPaint);/* 设置颜色及绘制矩形 */mPaint.setColor(Color.RED);canvas.drawRect(new Rect(45,45,140,100), mPaint);/* 解除画布的锁定 */canvas.restore();/* 设置颜色及绘制另一个矩形 */mPaint.setColor(Color.GREEN);canvas.drawRect(new Rect(150,75,260,120), mPaint);}