g.DrawLine(pen, 10, 130, 500, 130);

g.FillRectangle(lgbrush, 10, 150, 370, 30);

//定义路径并添加一个椭圆

GraphicsPath gp = new GraphicsPath();

gp.AddEllipse(10, 10, 200, 100);

//用该路径定义路径梯度刷子

PathGradientBrush brush =

new PathGradientBrush(gp);

//颜色数组

Color[] colors = {

Color.FromArgb(255, 0, 0),

Color.FromArgb(100, 100, 100),

Color.FromArgb(0, 255, 0),

Color.FromArgb(0, 0, 255)};

//定义颜色渐变比率

float[] r = {0.0f, 0.3f, 0.6f, 1.0f};

ColorBlend blend = new ColorBlend();

blend.Colors = colors;

blend.Positions = r;

brush.InterpolationColors = blend;

//在椭圆外填充一个矩形

g.FillRectangle(brush, 0, 0, 210, 110);

//用添加了椭圆的路径定义第二个路径梯度刷子

GraphicsPath gp2 = new GraphicsPath();

gp2.AddEllipse(300, 0, 200, 100);

PathGradientBrush brush2 = new PathGradientBrush(gp2);

//设置中心点位置和颜色

brush2.CenterPoint = new PointF(450, 50);

brush2.CenterColor = Color.FromArgb(0, 255, 0);

//设置边界颜色

Color[] color2 = {Color.FromArgb(255, 0, 0)};

brush2.SurroundColors = color2;

//用第二个梯度刷填充椭圆

g.FillEllipse(brush2, 300, 0, 200, 100);

}

GDI+的坐标系统

通用坐标系——用户自定义坐标系。

页面坐标系——虚拟坐标系。

设备坐标系——屏幕坐标系。

当页面坐标系和设备坐标系的单位都是象素时，它们相同。

private void button10_Click(object sender, System.EventArgs e)

{

Graphics g = this.pictureBoxII1.CreateGraphics();

g.Clear(Color.White);

this.Draw(g);

}

private void Draw(Graphics g)

{

g.DrawLine(Pens.Black, 10, 10, 100, 100);

g.DrawEllipse(Pens.Black, 50, 50, 200, 100);

g.DrawArc(Pens.Black, 100, 10, 100, 100, 20, 160);

g.DrawRectangle(Pens.Green, 50, 200, 150, 100);

}

private void button5_Click(object sender, System.EventArgs e)

{

//左移

Graphics g = this.pictureBoxII1.CreateGraphics();

g.Clear(Color.White);

g.TranslateTransform(-50, 0);

this.Draw(g);

}

private void button6_Click(object sender, System.EventArgs e)

{

//右移

Graphics g = this.pictureBoxII1.CreateGraphics();

g.Clear(Color.White);

g.TranslateTransform(50, 0);

this.Draw(g);

}

private void button7_Click(object sender, System.EventArgs e)

{

//旋转

 

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