首页 > 代码库 > GDI+的应用
GDI+的应用
在VS中创建窗体
（1）CDI+清除绘画面
在窗体中写入代码：
protected override void OnPaint(PaintEventArgs e){
Graphics g=e.Graphics;
g.Clear(Color.Pink);
g.Dispose();
}
（2）CGD+绘制多边形
protected override void OnPaint(PaintEventArgs e){
Graphics g=e.Graphics;
Point[] points=new Point[]{
new Point(200,200),
new Point(230,230),
new Point(260,300),
new Point(300,350)
};
g.DrawPolygon(new Pen(Color.Red),point);
g.Dispose();
}
（3）GDI+填充颜色
protected override void OnPaint(PaintEventArgs e){
//简单填充颜色
Graphics g=e.Graphics;
g.FillRectangle(Brushes.Red,new Rectangle(20,20,100,200));
//渐变颜色填充
Brush brush=new LinearGradientBrush(new Point(10,10),new Point(10,10),Color.Yellow,Color.White);
g.FillRectangle(brush,new Rectangle(20,20,100,170));
g.Dispose();
}
（4）GDI+绘画路径
protected override void OnPaint(PaintEventArgs e){
Graphics g = e.Graphics;
Point[] points = new Point[]{
new Point(100,100),
new Point(100,150),
new Point(150,200),
new Point(50,200),
};
GraphicsPath path = new GraphicsPath(
points,new byte[]{
(byte)PathPointType.Start,
(byte)PathPointType.Line,
(byte)PathPointType.Line,
(byte)PathPointType.Line
);
}
g.DrawPath(new Pen(Color.Red),path);
g.Dispose();
}
（4）GDI+绘制字符串
protected override void OnPaint(PaintEventArgs e){
Graphics g = e.Graphics;
//普通绘制字符串
Font font1=new System.Drawing.Font("宋体",30);
g.DrawingString("ABCD",font1,Brushes.Red,new PointF(30,30));
//带格式的字符串
Font font2 = new System.Drawing.Font("宋体", 30);
RectangleF rect = new RectangleF(100,100,100,200);
g.DrawRectangle(new Pen(Color.Red),new Rectangle(100,100,100,200));
//字符串格式对象
StringFormat sf = new StringFormat();
sf.Alignment = StringAlignment.Center;//在矩形中居中
sf.LineAlignment = StringAlignment.Center;
g.DrawString("abcd",font2,Brushes.Red,rect,sf);
g.Dispose();
}
（5）GDI+纹理绘画图片
protected override void OnPaint(PaintEventArgs e)
{
Graphics g = e.Graphics;
Image image = Image.FromFile("图片路径");
//纹理画笔
Brush brush = new TextureBrush(image);//刷出来的位置都有image的存在
g.DrawRectangle(new Pen(Color.Pink),40,40,300,300);
g.FillRectangle(brush,new Rectangle(40,40,300,300));
g.Dispose();
}
GDI+的应用