C#画笔代码示例
Pen 类对象指定绘制的图形外轮廓线宽度和颜色。Pen 类有 4 个构造函数，分别是：
1.public Pen(Color color);//建立颜色为 color 的笔，宽度默认为 1
2.public Pen(Color color，float width);//建立颜色为 color 的笔，宽度为 width
3.public Pen(Brush brush);//使用刷子为笔
4.public Pen(Brush,float width);//使用刷子为笔，宽度为 width
Pen类常用的属性：Color为笔的颜色，Width为笔的宽度，DashStyle为笔的样式，EndCap
和 StartCap 为线段终点和起点的外观。下例显示各种笔的 DashStyle、EndCap 和 StartCap
不同选项的样式(见下图)。主窗体 Paint 事件处理函数如下：
  private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
        {
            Graphics g = e.Graphics;
            Pen pen1 = new Pen(Color.Red, 6);//默认为实线笔
            g.DrawLine(pen1, 10, 10, 100, 10);//画实线，图中左边第 1 条线
            pen1.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash;//虚线笔
            g.DrawLine(pen1, 10, 20, 100, 20);//画虚线，图中左边第 2 条线
            pen1.DashStyle = System.Drawing.Drawing2D.DashStyle.DashDot;//点，短线风格的线
            g.DrawLine(pen1, 10, 30, 100, 30);//图中左边第 3 条线
            //双点，短线风格的线pen1.DashStyle=System.Drawing.Drawing2D.DashStyle.DashDotDot;
            g.DrawLine(pen1, 10, 40, 100, 40);//图中左边第 4 条线
            pen1.DashStyle = System.Drawing.Drawing2D.DashStyle.Dot;//由点组成的线
            g.DrawLine(pen1, 10, 50, 100, 50);//图中左边第 5 条线
            pen1.DashStyle = System.Drawing.Drawing2D.DashStyle.Solid;//实线笔
            pen1.EndCap = System.Drawing.Drawing2D.LineCap.ArrowAnchor;//后箭头
            g.DrawLine(pen1, 150, 10, 250, 10);//图中右边第 1 条线
            pen1.StartCap = System.Drawing.Drawing2D.LineCap.ArrowAnchor;//前箭头
            g.DrawLine(pen1, 150, 22, 250, 22);//图中右边第 2 条线
            pen1.EndCap = System.Drawing.Drawing2D.LineCap.RoundAnchor;
            g.DrawLine(pen1, 150, 34, 250, 34);//图中右边第 3 条线
            pen1.EndCap = System.Drawing.Drawing2D.LineCap.SquareAnchor;
            g.DrawLine(pen1, 150, 46, 250, 46);//图中右边第 4 条线
            pen1.EndCap = System.Drawing.Drawing2D.LineCap.Triangle;
            g.DrawLine(pen1, 150, 58, 250, 58);//图中右边第 5 条线
            pen1.EndCap = System.Drawing.Drawing2D.LineCap.DiamondAnchor;
            //图中右边第 6 条线
            g.DrawLine(pen1, 150, 70, 250, 70);
        }
运行效果如右图：

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