Graphics Class

System.Drawing 封装一个 GDI+ 绘图图面。 此类不能被继承。

https://docs.microsoft.com/zh-cn/dotnet/api/system.drawing.graphics?view=netframework-4.7.2#%E6%96%B9%E6%B3%95

 using System;
 using System.Drawing;
 using System.Collections;
 using System.ComponentModel;
 using System.Windows.Forms;
 using System.Data;

 public class Form1 : Form
 {
     public Form1()
     {
         this.AutoScaleBaseSize = new Size(, );
         this.ClientSize = new Size(, );
         this.Paint += new PaintEventHandler(this.Form1_Paint);
         this.Click += new EventHandler( this.Draw );
     }
     static void Main()
     {
         Application.Run(new Form1());
     }

     //Paint事件调用
     private void Form1_Paint(object sender, PaintEventArgs e)
     {
         Graphics g = e.Graphics;//传进来的对象不需要释放

         Brush brush = new SolidBrush(Color.Green);
         Font font = new Font("宋体", );

         g.DrawString("绘制", font, brush, , );
     }

     //在已存在的窗体上创建Graphics对象
     //窗体控件，Click事件
     private void Draw(object sender, EventArgs e)
     {
         Graphics g = this.CreateGraphics();

         Pen pen = new Pen(Color.Red, );
         Brush brush = new SolidBrush(Color.Blue);
         Font font = new Font("宋体", );
         Rectangle rect = new Rectangle(, , , );

         g.DrawLine(pen, , , , );
         g.DrawRectangle(pen, rect);
         g.DrawString("GDI+图形编程", font, brush, , );

         brush.Dispose(); font.Dispose(); pen.Dispose();//释放对象
         g.Dispose();
     }
 }

Graphics类方法的使用