c# - 画线时 Pen.Alignment 不起作用

Question

我想画粗线和细线。粗线应位于理论线内。所以我将笔对齐设置如下。

Pen blackPen = new Pen(Color.FromArgb(255, 0, 0, 0), 1);
Pen greenPen = new Pen(Color.FromArgb(255, 0, 255, 0), 10);

greenPen.Alignment = PenAlignment.Inset;

e.Graphics.DrawLine(greenPen, 10, 100, 100, 50);
e.Graphics.DrawLine(blackPen, 10, 100, 100, 50);

但是这个想法并没有实现。做同样的事情还有更好的主意吗？？？

Answer 1

Pen.Alignment部分实现:

This property determines how the Pen draws closed curves and polygons. The PenAlignment enumeration specifies five values; however, only two values—Center and Inset—will change the appearance of a drawn line. Center is the default value for this property and specifies that the width of the pen is centered on the outline of the curve or polygon. A value of Inset for this property specifies that the width of the pen is inside the outline of the curve or polygon. The other three values, Right, Left, and Outset, will result in a pen that is centered.

因此，Inset 仅适用于多边形或曲线(例如 Graphics.DrawRectangle)。