C# 图形绘制——指定线条端部形状

1 使用预定义形状

     画笔属性pen.StartCap和pen.EndCap指定线条的两端形状。

     预定义的形状：LineCap.Round 、LineCap.ArrowAnchor等等

      如：     pen.StartCap = LineCap.Round;

2 使用自定义形状

     如果使用自定义的端部形状，则使用pen.CustomStartCap和pen.CustomEndCap属性

      CustomLineCap  myCap = new CustomLineCap(null,path);//自定义端部形状

     path为GraphicsPath类型。

     如：pen.CustomStartCap = mycap;

 

示例：

 

            GraphicsPath hPath = new GraphicsPath();

            // Create the outline for our custom end cap.
            hPath.AddLine(new Point(0, 0), new Point(0, 5));
            hPath.AddLine(new Point(0, 5), new Point(5, 1));
            hPath.AddLine(new Point(5, 1), new Point(3, 1));

            //构造一个挂钩形状的端部形状
            CustomLineCap HookCap = new CustomLineCap(null, hPath);

            // 设定画笔线条端部形状为它
            Pen customCapPen = new Pen(Color.Black, 5);
            customCapPen.CustomStartCap = HookCap;
            customCapPen.CustomEndCap = HookCap;
            
            //使用预定义的端部形状
            Pen capPen = new Pen(Color.Red, 10);
            capPen.StartCap = LineCap.Round;
            capPen.EndCap = LineCap.ArrowAnchor;
          
            //无端部形状
            Pen pen = new Pen(Color.Chartreuse, 7);
            // Create a line to draw.
            Point[] points = { new Point(100, 100), new Point(300, 100) };
        
            // Draw the lines.
            e.Graphics.DrawLines(capPen, points);

            e.Graphics.DrawLines(pen,points);
            e.Graphics.DrawLines(customCapPen, points);