android中画布上的意外缩放行为

我有一个视图，我在其中绘制矩形和10条线。我正在使用“收缩缩放”来缩放视图，但出现了意外行为。线条正在缩放，但矩形不是

有人能指出我的错误吗

视图的onDraw（）方法是：

    onDraw() method of the view is:

                Rect r =new Rect(0, 0, 700, 40);

        public void onDraw(Canvas canvas) {

            float kk=mScaleFactor;    //this variable will be set by pinch zoom event and represent how much to scale
            sf*=kk;                   // this view must scale according to previous scaling  


            canvas.save();
            makeLinesinRangetwo(10, canvas); // this will make l0 lines within the width of rectangle

            float cX = canvas.getWidth()/2.0f; //Width/2 gives the horizontal centre
            float cY = canvas.getHeight()/2.0f; //Height/2 gives the vertical centre
            canvas.scale(sf , 1,cX,cY);
            paint.setStyle(Paint.Style.FILL);
            paint.setColor(Color.BLUE); 
            canvas.drawRect(r, paint);
            canvas.restore();
            requestLayout();                               //this will change view width to fit the expanded rectangle 
            }

当我在（0,0）附近缩放时也是如此。矩形和直线都在缩放。我没有这种行为

    public void onDraw(Canvas canvas) {

            float kk=mScaleFactor;    //this variable will be set by pinch zoom event and represent how much to scale
            sf*=kk;                   // this view must scale according to previous scaling  


            canvas.save();
            makeLinesinRangetwo(10, canvas); // this will make l0 lines within the width of rectangle

            canvas.scale(sf , 1);
            paint.setStyle(Paint.Style.FILL);
            paint.setColor(Color.BLUE); 
            canvas.drawRect(r, paint);
            canvas.restore();
            requestLayout();                               //this will change view width to fit the expanded rectangle 
            }

---

我认为问题在于你在画布的中心缩放画布，但是你应该给pivotX和pivotY指定矩形的中心。

我假设

canvas.scale

中出现的

sf

参数是

kk

在

onDraw

的开头定义的？此外，您应该在设置比例之前保存画布的矩阵，然后在设置完成后将其还原。否则，每次触发收缩事件时，都会累积缩放矩阵。这10行的缩放是否正确？@Saran我已经编辑了代码。是的，我的矩形内的线条正在缩放。但矩形不是。@Saran我也有非常意想不到的行为。我已经编辑了这个问题并将我的问题发布在那里。