碰撞只适用于两面

Question

所以我试图在c＃中制作一个pacman克隆，Visual studio express 2013.我有迷宫，并且我把标签放在边缘。我对pacman的未来坐标有一点看法。如果该点与标签不相交，则pacmans位置将采用该点的位置。当pacman从右或向下来时，这种方法很好，但如果他来自右边或顶部，它就不起作用。对于鬼魂来说也是如此，鬼魂的运动是随机产生的。他们似乎都认为标签更大。我试图在互联网上搜索为什么会这样，但我似乎无法找到答案。我用碰撞检查和pacman运动放下了这个部分。提前致谢

    private void timer_Tick(object sender, EventArgs e)
    {
       //colision check
        PictureBox intermed = new PictureBox
        {
            Location = new Point(pictureBox1.Location.X + pacdirx, pictureBox1.Location.Y + pacdiry),
        };
        if (!intermed.Bounds.IntersectsWith(label1.Bounds) )
            pictureBox1.Location = new Point(pictureBox1.Location.X + pacdirx, pictureBox1.Location.Y + pacdiry);

    private void Form3_KeyDown(object sender, KeyEventArgs e)
    {
        //pacman movement
        if (e.KeyCode == Keys.W)
        {

            pacdiry = -3;
            pacdirx = 0;
            pictureBox1.Image = Image.FromFile("eat_up.gif");
        }
        if (e.KeyCode == Keys.S)
        {
            pacdiry = 3;
            pacdirx = 0;
            pictureBox1.Image = Image.FromFile("eat_down.gif");
        }
        if (e.KeyCode == Keys.D)
        {
            pacdiry = 0;
            pacdirx = 3;
            pictureBox1.Image = Image.FromFile("eat_right.gif");
        }
        if (e.KeyCode == Keys.A)
        {
            pacdiry = 0;
            pacdirx = -3;
            pictureBox1.Image = Image.FromFile("eat_left.gif");
        }
    }