1 @Override
 2         protected void onDraw(Canvas canvas) {
 3             canvas.translate(100, 100);
 4             canvas.drawColor(Color.RED);//可以看到，整个屏幕依然填充为红色
 5             
 6             canvas.drawRect(new Rect(-100, -100, 0, 0), new Paint());//缩放了
 7             canvas.scale(0.5f, 0.5f);
 8             canvas.drawRect(new Rect(0, 0, 100, 100), new Paint());
 9             
10             canvas.translate(200, 0);
11             canvas.rotate(30);
12             canvas.drawRect(new Rect(0, 0, 100, 100), new Paint());//旋转了
13             
14             canvas.translate(200, 0);
15             canvas.skew(.5f, .5f);//扭曲了
16             canvas.drawRect(new Rect(0, 0, 100, 100), new Paint());
17             // canvas.setMatrix(matrix);//Matrix的使用在后面在是。
18         }