c# - Connect 4 C#(如何绘制网格)

Question

我已经编写了大部分代码并且有几个游戏类。我现在坚持的一点是如何绘制实际的 Connect 4 网格。谁能告诉我这个 for 循环有什么问题？我没有收到任何错误，但没有出现网格。我正在使用 C#。

private void Drawgrid() 
{
    Brush b = Brushes.Black;
    Pen p = Pens.Black;
    for (int xCoor = XStart, col = 0; xCoor < XStart + ColMax * DiscSpace; xCoor += DiscSpace, col++)
    {
        // x coordinate beginning; while the x coordinate is smaller than the max column size, times it by
        // the space between each disc and then add the x coord to the disc space in order to create a new circle.
        for (int yCoor = YStart, row = RowMax - 1; yCoor < YStart + RowMax * DiscScale; yCoor += DiscScale, row--)
        {
            switch (Grid.State[row, col])
            {
                case GameGrid.Gridvalues.Red:
                    b = Brushes.Red;
                    break;
                case GameGrid.Gridvalues.Yellow:
                    b = Brushes.Yellow;
                    break;
                case GameGrid.Gridvalues.None:
                    b = Brushes.Aqua;
                    break;
            }
        }
        MainDisplay.DrawEllipse(p, xCoor, yCoor, 50, 50);
        MainDisplay.FillEllipse(b, xCoor, yCoor, 50, 50);
    }
    Invalidate();
}

Answer 1

Drawgrid() 中的代码需要在窗口重绘时执行。

Invalidate() 调用告诉应用程序它需要重绘窗口内容(它会触发窗口的重绘)。此代码(Invalidate() 调用除外)应该在您重写的 OnPaint() 方法中，否则此代码绘制的任何内容都将立即被当您调用 Invalidate() 时，OnPaint() 中的默认绘图代码(默认情况下，它可能会绘制白色背景)。

protected override void OnPaint(PaintEventArgs e)
{
    Graphics g = e.Graphics;

    // (your painting code here...)
}