如何在GDI+实现的迷宫游戏中实现玩家遇墙禁止移动功能？

• 蓝色图片框 = PlayerPictureBox
• 新游戏按钮 = btnCreate

首先，已使用GDI+实现迷宫的形状。
我已实现玩家移动功能，但如何实现玩家遇到墙壁时禁止移动的功能？

以下是我的代码：

private void btnCreate_Click(object sender, EventArgs e)
{
    int wid = 15;
    int hgt = 15;

    CellWidth = picMaze.ClientSize.Width / (wid+2);
    CellHeight = picMaze.ClientSize.Height / (hgt+2);

    Xmin = (picMaze.ClientSize.Width - wid * CellWidth) / 2;
    Ymin = (picMaze.ClientSize.Height - hgt * CellHeight) / 2;

    MazeNode[,] nodes = MakeNodes(wid, hgt);
    MakeRandomMaze(nodes[0, 0]);
    DisplayMaze(nodes);

    PlayerPictureBox.Visible = true;
    arrivePicturBox.Visible = true;

    PlayerPictureBox.Location = new Point(70,51);
}

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
    switch (keyData)
    {
        case Keys.Left:
            PlayerPictureBox.Left -= 5;
            break;
        case Keys.Right:
            PlayerPictureBox.Left += 5;
            break;
        case Keys.Up:
            PlayerPictureBox.Top -= 5;
            break;
        case Keys.Down:
            PlayerPictureBox.Top += 5;
            break;
        default: return base.ProcessCmdKey(ref msg, keyData);
    }
    return true;
}

解决方案 #

核心思路是先判断移动方向是否存在墙壁，再执行移动，结合你的迷宫数据结构，按以下步骤修改：

1. 提升关键变量为类成员
   把nodes、wid、hgt、CellWidth、CellHeight、Xmin、Ymin这些变量从btnCreate_Click方法里移到类的成员区域，让ProcessCmdKey能访问到。

2. 修改移动逻辑，加入碰撞检测
   假设你的MazeNode类包含HasLeftWall、HasRightWall、HasTopWall、HasBottomWall四个布尔属性记录墙壁状态，修改后的ProcessCmdKey如下：

protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
    bool canMove = true;
    int playerCol = (PlayerPictureBox.Left - Xmin) / CellWidth;
    int playerRow = (PlayerPictureBox.Top - Ymin) / CellHeight;

    // 先检查玩家是否在迷宫范围内
    if (playerCol < 0 || playerCol >= wid || playerRow < 0 || playerRow >= hgt)
    {
        canMove = false;
    }
    else
    {
        MazeNode currentNode = nodes[playerRow, playerCol];
        switch (keyData)
        {
            case Keys.Left:
                canMove = playerCol > 0 && !currentNode.HasLeftWall;
                break;
            case Keys.Right:
                canMove = playerCol < wid - 1 && !currentNode.HasRightWall;
                break;
            case Keys.Up:
                canMove = playerRow > 0 && !currentNode.HasTopWall;
                break;
            case Keys.Down:
                canMove = playerRow < hgt - 1 && !currentNode.HasBottomWall;
                break;
            default:
                return base.ProcessCmdKey(ref msg, keyData);
        }
    }

    // 允许移动才执行位置变更
    if (canMove)
    {
        switch (keyData)
        {
            case Keys.Left:
                PlayerPictureBox.Left -= 5;
                break;
            case Keys.Right:
                PlayerPictureBox.Left += 5;
                break;
            case Keys.Up:
                PlayerPictureBox.Top -= 5;
                break;
            case Keys.Down:
                PlayerPictureBox.Top += 5;
                break;
        }
    }

    return true;
}

3. 补充说明
   如果你的移动步长（5像素）不等于单元格尺寸，或者需要更精确的像素级碰撞检测，可以直接获取墙壁的像素坐标，用PlayerPictureBox.Bounds.IntersectsWith(墙壁矩形)来判断是否会碰撞。

内容的提问来源于stack exchange，提问作者toe ko