Graphics和PathGradientBrush转换错误。

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问题描述

e.Graphics.RotateTransform（30）之后的下一个代码出错了;

The next code goes wrong after e.Graphics.RotateTransform(30);

public Form1()
{
    InitializeComponent();

    this.BackColor = Color.Black;

    this.DoubleBuffered = true;
    this.Paint += Draw;
    this.Invalidate();
}

private void Draw(object sender, System.Windows.Forms.PaintEventArgs e)
{
    GraphicsPath path = new GraphicsPath();

    path.AddRectangle(new Rectangle(50, 50, 100, 20));

    using (PathGradientBrush pgb = new PathGradientBrush(path))
    {
        pgb.FocusScales = new PointF(1f, 0f);
        pgb.CenterColor = Color.FromArgb(255, 255, 255, 255);
        pgb.SurroundColors = new Color[] { Color.FromArgb(0, 255, 255, 255) };
        e.Graphics.RotateTransform(30); // Error!
        e.Graphics.FillRectangle(pgb, 0, 0, 200, 200);
    }
}

右：

没有e.Graphics.RotateTransform（30）;

[]

错误：

使用e.Graphics.RotateTransform（30）;

[ ]

如何修复？

我想我也应该改造PathGradientBrush。

Right:
Without e.Graphics.RotateTransform(30);
https://social.msdn.microsoft.com/Forums/getfile/542870[^]

Wrong:
With e.Graphics.RotateTransform(30);
https://social.msdn.microsoft.com/Forums/getfile/542871[^]

How to fix?
I think i should also transform PathGradientBrush.

推荐答案

private void Draw(object sender, System.Windows.Forms.PaintEventArgs e)
		{
			GraphicsPath path = new GraphicsPath();
			
			path.AddRectangle(new Rectangle(50, 50, 100, 20));

			using (PathGradientBrush pgb = new PathGradientBrush(path))
			{
				pgb.FocusScales = new PointF(1f, 0f);
				pgb.CenterColor = Color.FromArgb(255, 255, 255, 255);
				pgb.SurroundColors = new Color[] { Color.FromArgb(0, 255, 255, 255) };
				e.Graphics.RotateTransform(30); // error!
				e.Graphics.FillPath(pgb, path);
				//e.Graphics.FillRectangle(pgb, 0, 0, 200, 200);
				
			}
		}

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