Using Windows Forms in Visual Studio with C#, is there a way to get the Graphics.DrawEllipse function to draw the ellipse exactly as specified?

Question

I'm learning C# and graphics programming using Windows Forms for Visual Studio, and I'm running into a problem where calling DrawEllipse and passing a rectangle the size of the window causes the ellipse to go outside of the window on the right and bottom sides .

这是绘制椭圆的代码：

    private void Form1_Paint(object sender, PaintEventArgs e)
    {
        e.Graphics.Clear(Color.FromArgb(0, 0, 40));
        e.Graphics.DrawEllipse(new Pen(Color.FromArgb(0, 150, 0)), new Rectangle(0, 0, this.Width, this.Height));
    }

当此代码运行时，它会产生以下结果： Ellipse draw in window

我已经尝试在 Form1_Load function 中设置 window 大小，但没有任何改变。 是否有一些财产我应该在某个时候改变？ 我很难相信this.Width和this.Height实际上与 window 的尺寸不匹配。 有没有其他人遇到过这个问题？

Answer 1

当您使用Form.Width和Form.Height时，您得到的是 Form 的尺寸，包括非客户区。 尝试使用Form.ClientSize.Width和Form.ClientSize.Height 。

IE

private void Form1_Paint(object sender, PaintEventArgs e)
{
    e.Graphics.Clear(Color.FromArgb(0, 0, 40));
    e.Graphics.DrawEllipse(new Pen(Color.FromArgb(0, 150, 0)), new Rectangle(0, 0, this.ClientSize.Width-1, this.ClientSize.Height-1));
}