C# 圖形繪製——指定線條端部形狀

1 使用預定義形狀

     畫筆屬性pen.StartCap和pen.EndCap指定線條的兩端形狀。

     預定義的形狀：LineCap.Round 、LineCap.ArrowAnchor等等

      如：     pen.StartCap = LineCap.Round;

2 使用自訂形狀

     如果使用自訂的端部形狀，則使用pen.CustomStartCap和pen.CustomEndCap屬性

      CustomLineCap  myCap = new CustomLineCap(null,path);//自訂端部形狀

     path為GraphicsPath類型。

     如：pen.CustomStartCap = mycap;

 

樣本：

 

Code
            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));

            //構造一個掛鈎形狀的端部形狀
            CustomLineCap HookCap = new CustomLineCap(null, hPath);

            // 設定畫筆線條端部形狀為它
            Pen customCapPen = new Pen(Color.Black, 5);
            customCapPen.CustomStartCap = HookCap;
            customCapPen.CustomEndCap = HookCap;
            
            //使用預定義的端部形狀
            Pen capPen = new Pen(Color.Red, 10);
            capPen.StartCap = LineCap.Round;
            capPen.EndCap = LineCap.ArrowAnchor;
          
            //無端部形狀
            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);