Method onTouchEvent

CustomView/Advance/Code/SetPolyToPoly.java:72–95

(MotionEvent event)

    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {

        switch (event.getAction()){
            case MotionEvent.ACTION_MOVE:
                float tempX = event.getX();
                float tempY = event.getY();

                // 根据触控位置改变dst
                for (int i=0; i<testPoint*2; i+=2 ) {
                    if (Math.abs(tempX - dst[i]) <= triggerRadius && Math.abs(tempY - dst[i+1]) <= triggerRadius){
                        dst[i]   = tempX-100;
                        dst[i+1] = tempY-100;
                        break;  // 防止两个点的位置重合
                    }
                }

                resetPolyMatrix(testPoint);
                invalidate();
                break;
        }

        return true;
    }

    public void resetPolyMatrix(int pointCount){
        mPolyMatrix.reset();