由网友(甜的诱人)分享简介：我绘图上的控制的曲线图，但0,0是在控制的顶部左手角落。有没有一种方法来翻转坐标，以便0,0是控制的左下角？I am drawing a graph on a control, but 0,0 is at the top-left hand corner of the control. Is there a way...

我绘图上的控制的曲线图，但0,0是在控制的顶部左手角落。有没有一种方法来翻转坐标，以便0,0是控制的左下角？

I am drawing a graph on a control, but 0,0 is at the top-left hand corner of the control. Is there a way to flip the coordinates so that 0,0 is at the lower left corner of the control?

推荐答案

如果你正在使用的WinForms，那么你可能会发现，你可以将Y轴采用的 Graphics.ScaleTransform ：

If you are using WinForms, then you might find that you can flip the Y-Axis using Graphics.ScaleTransform:

private void ScaleTransformFloat(PaintEventArgs e)
{
    // Begin graphics container
    GraphicsContainer containerState = e.Graphics.BeginContainer();

    // Flip the Y-Axis
    e.Graphics.ScaleTransform(1.0F, -1.0F);

    // Translate the drawing area accordingly
    e.Graphics.TranslateTransform(0.0F, -(float)Height);

    // Whatever you draw now (using this graphics context) will appear as
    // though (0,0) were at the bottom left corner
    e.Graphics.DrawRectangle(new Pen(Color.Blue, 3), 50, 0, 100, 40);

    // End graphics container
    e.Graphics.EndContainer(containerState);

    // Other drawing actions here...
}

您只需要，如果你想使用常规的坐标系，以及做更多的图纸包含的开始/结束容器调用。是MSDN 提供的图形容器的更多信息

You only need to include the begin/end container calls if you want to do additional drawing using the regular coordinate system as well. More information on graphics containers is available on MSDN.

由于在评论中提到汤姆，这种方法需要的身高值可用一个正确的值。如果你试试这个，看看什么正在绘制，确保值是正确的调试。

As mentioned by Tom in the comments, this approach requires the Height value to be available with a correct value. If you try this and see nothing being drawn, ensure that value is correct in a debugger.