c#之GDI简单实现代码及其实例

作业：文档形式

3到5页理解

1.理解

2.源代码解释（1到2页）

3.实现效果

项目地址： https://github.com/zhiyishou/polyer

Demo：https://zhiyishou.github.io/Polyer

GDI

https://www.cnblogs.com/stg609/archive/2008/03/16/1108333.html

1.pen类创建画笔对象：

1) 新建一个Windows应用程序，适当加宽窗体宽度。然后切换到代码方式，添加名称空间引用：
using System.Drawing.Drawing2D;
2) 添加Form1_Paint事件代码

3）在Form1_Load中手动添加paint事件：

this.Paint += new PaintEventHandler(Form1_Paint);

 using System;

 using System.Collections.Generic;

 using System.ComponentModel;

 using System.Data;

 using System.Drawing;

 using System.Drawing.Drawing2D;

 using System.Linq;

 using System.Text;

 using System.Threading.Tasks;

 using System.Windows.Forms;

 namespace drawpicture

 {

     public partial class Form1 : Form

     {

         public Form1()

         {

             InitializeComponent();

         }

         public void Form1_Paint(object sender, PaintEventArgs e)

         {

             Graphics g = e.Graphics; //创建画板,这里的画板是由Form提供的.

             Pen pen = new Pen(Color.Blue, 10.5f);

             g.DrawString("蓝色，宽度为10.5", this.Font,

                                new SolidBrush(Color.Black), , );

             g.DrawLine(pen, new Point(, ), new Point(, ));

             pen.Width = ;

             pen.Color = Color.Red;

             g.DrawString("红色，宽度为2", this.Font,

                                new SolidBrush(Color.Black), , );

             g.DrawLine(pen, new Point(, ), new Point(, ));

             pen.StartCap = LineCap.Flat;

             pen.EndCap = LineCap.ArrowAnchor;

             pen.Width = ;

             g.DrawString("红色箭头线", this.Font,

                                                        new SolidBrush(Color.Black), , );

             g.DrawLine(pen, new Point(, ), new Point(, ));

             pen.DashStyle = DashStyle.Custom;

             pen.DashPattern = new float[] { ,  };

             pen.Width = ;

             pen.EndCap = LineCap.NoAnchor;

             g.DrawString("自定义虚线", this.Font,

                                                         new SolidBrush(Color.Black), , );

             g.DrawLine(pen, new Point(, ), new Point(, ));

             pen.DashStyle = DashStyle.Dot;

             g.DrawString("点划线", this.Font, new SolidBrush(Color.Black), , );

             g.DrawLine(pen, new Point(, ), new Point(, ));

         }

         private void contextMenuStrip1_Opening(object sender, CancelEventArgs e)

         {

         }

         private void Form1_Load(object sender, EventArgs e)

         {

             this.Paint += new PaintEventHandler(Form1_Paint);

         }

         private void button1_Click(object sender, EventArgs e)

         {

         }

     }

 }

整个源码

运行情况：

2.画刷

public void Form1_Paint(object sender, PaintEventArgs e)
{
Graphics g = e.Graphics;
SolidBrush myBrush = new SolidBrush(Color.Red);
g.FillEllipse(myBrush, this.ClientRectangle);
}

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