GDI+: Pen and Brush

GDI+通过Pen类来定义一个画笔的，其构造函数有四种：

// Pen(color), 默认宽度 Pen pen = new Pen(Color.White); // Pen(color, witdh) Pen pen = new Pen(Color.White, 4); // Pen(brush), 根据画刷来构造一个画笔，默认宽度 SoildBrush sBrush = new SoildBrush(Color.Red); Pen pen = new Pen(sBrush); // Pen(brush, width) Pen pen = new Pen(sBrush, 20);

 

一个基础的实例如下，这里使用了线性渐变画刷和纹理画刷：

private void Form1_Paint(object sender, PaintEventArgs e) { Graphics g = e.Graphics; g.Clear(Color.White); LinearGradientBrush brush = new LinearGradientBrush(new Rectangle(0, 0, 10, 10), Color.Yellow, Color.Green, LinearGradientMode.BackwardDiagonal); Pen pen = new Pen(brush); pen.Width = 10; g.DrawRectangle(pen, 10, 10, 100, 100); g.FillRectangle(brush, 10, 10, 100, 100); Bitmap bmp = new Bitmap(@"G:/CoolIcons/ivy.ico"); TextureBrush tBrush = new TextureBrush(bmp); Pen texturedPen = new Pen(tBrush, 42); Point pt1 = new Point(10, 100); Point pt2 = new Point(100, 10); Point pt3 = new Point(150, 150); Point pt4 = new Point(200, 100); g.TranslateTransform(130, 0); g.DrawBezier(texturedPen, pt1, pt2, pt3, pt4); }

 

 运行结果如下图：

 

 

GDI+支持五种画刷：单色画刷SolidBrush、影线画刷HatchBrush、纹理画刷TextureBrush、线性渐变画刷LinearGradientBrush、路径渐变画刷PathGradientBrush。与画笔不同，画刷只是用来填充区域的，所以，画刷无宽度、长度可言。