如何在android中通过在任意方向拖动4个点来创建不规则四边形

public class IrregularQuadrilateralView extends View {
    private float[] points; // 保存4个点的坐标

    public IrregularQuadrilateralView(Context context) {
        super(context);
        points = new float[8]; // 4个点，每个点有x和y两个坐标
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        // 绘制四边形
        Path path = new Path();
        path.moveTo(points[0], points[1]);
        path.lineTo(points[2], points[3]);
        path.lineTo(points[4], points[5]);
        path.lineTo(points[6], points[7]);
        path.close();

        Paint paint = new Paint();
        paint.setColor(Color.RED);
        canvas.drawPath(path, paint);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        int action = event.getAction();
        float x = event.getX();
        float y = event.getY();

        switch (action) {
            case MotionEvent.ACTION_DOWN:
                // 按下时更新第一个点的坐标
                points[0] = x;
                points[1] = y;
                break;
            case MotionEvent.ACTION_MOVE:
                // 移动时更新其他点的坐标
                points[2] = x;
                points[3] = y;
                points[4] = x + 100; // 假设第三个点和第四个点的x坐标比第二个点的x坐标大100
                points[5] = y + 100; // 假设第三个点和第四个点的y坐标比第二个点的y坐标大100
                points[6] = x + 200; // 假设第四个点的x坐标比第三个点的x坐标大200
                points[7] = y;
                break;
        }

        invalidate(); // 重绘View

        return true;
    }
}

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        LinearLayout layout = findViewById(R.id.layout);
        IrregularQuadrilateralView view = new IrregularQuadrilateralView(this);
        layout.addView(view);
    }
}