如何在画布上绘制云形？

Question

我想在Canvas中创建一个Cloud形状。

当用户在画布上单击任意位置时，将创建云形。

用户应该能够拖动形状。

我使用以下代码在画布上绘制了矩形和箭头。 但是我无法成功地画出一条弧线。

 private void drawOnRectProjectedBitMap(ImageView iv, Bitmap bm, int x, int y) {
        if (x < 0 || y < 0 || x > iv.getWidth() || y > iv.getHeight()) {
            //outside ImageView
            return;
        } else {
            int projectedX = (int) ((double) x * ((double) bm.getWidth() / (double) iv.getWidth()));
            int projectedY = (int) ((double) y * ((double) bm.getHeight() / (double) iv.getHeight()));

            //clear canvasDrawingPane
            canvasDrawingPane.drawColor(Color.TRANSPARENT, Mode.CLEAR);
            Paint paint = new Paint();
            paint.setStyle(Paint.Style.STROKE);
            paint.setColor(Color.WHITE);
            paint.setStrokeWidth(3);
            canvasDrawingPane.drawRect(startPt.x, startPt.y, projectedX, projectedY, paint);
            imageDrawingPane.invalidate();
            textSource.setText(x + ":" + y + "/" + iv.getWidth() + " : " + iv.getHeight() + "\n" +
                    projectedX + " : " + projectedY + "/" + bm.getWidth() + " : " + bm.getHeight()
            );
        }
    }