Graphics g = e.Graphics; // 创建画板Pen p = new Pen(Color.Blue, 1); // 画笔颜色及宽度g.DrawLine(p, 10, 10, 110, 110); // 绘制直线g.DrawLine(p, 210, 10, 110, 110);g.DrawRectangle(p, 10, 10, 100, 100); // 绘制矩形g.DrawRectangle(p, 110, 10, 100, 100);g.DrawEllipse(p, 10, 10, 200, 100); // 根据外接矩形绘制椭圆g.Dispose();p.Dispose();

Result:

Pen的属性主要有: Color(颜色),DashCap(短划线终点形状),DashStyle(虚线样式),EndCap(线尾形状), StartCap(线头形状),Width(粗细)等。

Graphics g = e.Graphics; // 创建画板Pen p = new Pen(Color.Blue, 5); // 画笔颜色及宽度p.DashStyle = DashStyle.Dot; // 定义虚线的样式为点g.DrawLine(p, 10, 10, 200, 10);p.DashPattern = new float[] { 2, 1 }; // 设置短划线和空白部分的数组g.DrawLine(p, 10, 20, 200, 20);p.DashStyle = DashStyle.Solid; // 恢复实线p.EndCap = LineCap.ArrowAnchor; // 实现箭头，只对非封闭线有效g.DrawLine(p, 10, 30, 200, 30);g.Dispose();p.Dispose();

Result:

下面简单实现一下Brush的使用，

Graphics g = this.CreateGraphics();Rectangle rect = new Rectangle(10, 10, 50, 50);//定义矩形,参数为起点横纵坐标以及其长和宽SolidBrush b1 = new SolidBrush(Color.Blue);//定义单色画刷          g.FillRectangle(b1, rect); //填充矩形g.DrawString("字符串", new Font("宋体", 10), b1, new PointF(90, 10)); // 字符串TextureBrush b2 = new TextureBrush(Image.FromFile(@"D:\b.jpg")); // 使用图片填充rect.Location = new Point(10, 70); // 更改矩形的起点坐标rect.Width = 200; // 更改矩形的宽rect.Height = 200; // 更改矩形的高g.FillRectangle(b2, rect);rect.Location = new Point(230, 10);LinearGradientBrush b3 = new LinearGradientBrush(rect, Color.Yellow, Color.Red, LinearGradientMode.Horizontal); // 用渐变色填充g.FillRectangle(b3, rect);

Result:

下面实现对坐标轴的变换，默认坐标轴原点为左上角，正X轴向右，正Y轴向下。

using (Graphics g = this.CreateGraphics()){    Pen p = new Pen(Color.OrangeRed, 1);    //转变坐标轴角度    for (float i = 1; i < 90; i += 0.1f)    {        g.RotateTransform(i); // 每旋转0.1度画一条线        g.DrawLine(p, 0, 0, i, 0);    }    g.ResetTransform();    g.TranslateTransform(100, 100); // 平移坐标轴    g.DrawLine(p, 0, 0, 100, 0);    g.ResetTransform();    g.TranslateTransform(100, 200); // 先平移到指定坐标,然后进行度旋转    for (int i = 0; i < 8; i++)    {        g.RotateTransform(45);        g.DrawLine(p, 0, 0, 100, 0);    }}

Result:

GDI+ 图形设备接口普拉斯（Graphic Device Interface Plus）属于非托管资源，应手动释放。