c#制作的简单的画图板

文章出处：http://xiaoliang1982.blog.hexun.com/5723850_d.html

以下是源代码，直接粘贴到.cs中就可以用了。

using System;using System.Drawing;using System.Collections;using System.ComponentModel;using System.Windows.Forms;using System.Drawing.Drawing2D;using System.Data;namespace WindowsApptest9_21{ /// <summary> /// Form1 的摘要说明。 /// </summary> public class Form1 : System.Windows.Forms.Form { public System.Windows.Forms.PictureBox pictureBox1; private Point p1 = Point.Empty, p2 = Point.Empty; private Point p3=Point.Empty; private bool isMouseDown = false, isMouseUp = false; ArrayList addArray = new ArrayList(); ArrayList aaaArray = new ArrayList(); private System.Windows.Forms.Button button1; private System.Windows.Forms.Button button2; public string shape; private System.Windows.Forms.Button button3; private System.Windows.Forms.Button button4; private Color color=Color.Black; private System.Windows.Forms.Button button5; private System.Windows.Forms.Button button6;// private Pen pen; // Pen pen=new Pen(col,2); public struct SharpType { public string type; public Point p1, p2; public Color foreColor, backColor; public Brush brush; public SharpType(string type, Point p1, Point p2, Color foreColor, Color backColor, Brush brush ) { this.type = type; this.p1 = p1; this.p2 = p2; this.foreColor = foreColor; this.backColor = backColor; this.brush = brush; }// public Point[]points=new Point[]; } /// <summary> /// 必需的设计器变量。 /// </summary> private System.ComponentModel.Container components = null; public Form1() { // // Windows 窗体设计器支持所必需的 // InitializeComponent(); // // TODO: 在 InitializeComponent 调用后添加任何构造函数代码 // } /// <summary> /// 清理所有正在使用的资源。 /// </summary> protected override void Dispose( bool disposing ) { if( disposing ) { if (components != null) { components.Dispose(); } } base.Dispose( disposing ); } #region Windows 窗体设计器生成的代码 /// <summary> /// 设计器支持所需的方法 - 不要使用代码编辑器修改 /// 此方法的内容。 /// </summary> private void InitializeComponent() { this.pictureBox1 = new System.Windows.Forms.PictureBox(); this.button1 = new System.Windows.Forms.Button(); this.button2 = new System.Windows.Forms.Button(); this.button3 = new System.Windows.Forms.Button(); this.button4 = new System.Windows.Forms.Button(); this.button5 = new System.Windows.Forms.Button(); this.button6 = new System.Windows.Forms.Button(); this.SuspendLayout(); // // pictureBox1 // this.pictureBox1.BackColor = System.Drawing.Color.White; this.pictureBox1.Cursor = System.Windows.Forms.Cursors.Cross; this.pictureBox1.Location = new System.Drawing.Point(0, 0); this.pictureBox1.Name = "pictureBox1"; this.pictureBox1.Size = new System.Drawing.Size(432, 397); this.pictureBox1.TabIndex = 0; this.pictureBox1.TabStop = false; this.pictureBox1.Paint += new System.Windows.Forms.PaintEventHandler(this.pictureBox1_Paint); this.pictureBox1.MouseUp += new System.Windows.Forms.MouseEventHandler(this.pictureBox1_MouseUp); this.pictureBox1.MouseMove += new System.Windows.Forms.MouseEventHandler(this.pictureBox1_MouseMove); this.pictureBox1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.pictureBox1_MouseDown); // // button1 // this.button1.Location = new System.Drawing.Point(448, 72); this.button1.Name = "button1"; this.button1.TabIndex = 1; this.button1.Text = "矩形"; this.button1.Click += new System.EventHandler(this.button1_Click); // // button2 // this.button2.Location = new System.Drawing.Point(448, 112); this.button2.Name = "button2"; this.button2.TabIndex = 2; this.button2.Text = "椭圆"; this.button2.Click += new System.EventHandler(this.button2_Click); // // button3 // this.button3.Location = new System.Drawing.Point(448, 144); this.button3.Name = "button3"; this.button3.TabIndex = 3; this.button3.Text = "直线"; this.button3.Click += new System.EventHandler(this.button3_Click); // // button4 // this.button4.Location = new System.Drawing.Point(448, 224); this.button4.Name = "button4"; this.button4.TabIndex = 4; this.button4.Text = "选择颜色"; this.button4.Click += new System.EventHandler(this.button4_Click); // // button5 // this.button5.Location = new System.Drawing.Point(448, 184); this.button5.Name = "button5"; this.button5.TabIndex = 5; this.button5.Text = "清除"; this.button5.Click += new System.EventHandler(this.button5_Click); // // button6 // this.button6.Location = new System.Drawing.Point(448, 32); this.button6.Name = "button6"; this.button6.TabIndex = 6; this.button6.Text = "曲线"; this.button6.Click += new System.EventHandler(this.button6_Click); // // Form1 // this.AutoScaleBaseSize = new System.Drawing.Size(6, 14); this.ClientSize = new System.Drawing.Size(552, 397); this.Controls.Add(this.button6); this.Controls.Add(this.button5); this.Controls.Add(this.button4); this.Controls.Add(this.button3); this.Controls.Add(this.button2); this.Controls.Add(this.button1); this.Controls.Add(this.pictureBox1); this.Name = "Form1"; this.Text = "Form1"; this.ResumeLayout(false); } #endregion /// <summary> /// 应用程序的主入口点。 /// </summary> [STAThread] static void Main() { Application.Run(new Form1()); } private void pictureBox1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e) { if( ! isMouseUp ) { this.isMouseDown = true; this.p1 = new Point( e.X, e.Y ); } } private void pictureBox1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e) { Graphics g = this.pictureBox1.CreateGraphics(); if( isMouseDown && p2 != Point.Empty ) { if(this.shape=="DrawEllipse") { g.DrawEllipse( Pens.White, p1.X, p1.Y, Math.Abs( p1.X - p2.X ), Math.Abs( p1.Y - p2.Y ) ); } if(this.shape=="DrawRectangle") { g.DrawRectangle( Pens.White, p1.X, p1.Y, Math.Abs( p1.X - p2.X ), Math.Abs( p1.Y - p2.Y ) ); } if(this.shape=="DrawLine") { g.DrawLine(Pens.White,this.p1,this.p2); } } if( isMouseDown && ! isMouseUp ) { p2 = new Point( e.X, e.Y ); if(this.shape=="DrawEllipse") { g.DrawEllipse(new Pen(color,1), p1.X, p1.Y, Math.Abs( p1.X - p2.X ), Math.Abs( p1.Y - p2.Y ) ); } if(this.shape=="DrawRectangle") { // g.DrawRectangle( Pens.Black, p1.X, p1.Y, Math.Abs( p1.X - p2.X ), Math.Abs( p1.Y - p2.Y ) ); g.DrawRectangle( new Pen(color,1), p1.X, p1.Y, Math.Abs( p1.X - p2.X ), Math.Abs( p1.Y - p2.Y ) ); } if(this.shape=="DrawLine") { g.DrawLine(new Pen(color,1),this.p1,this.p2); } if(this.shape=="DrawCurve") { g.DrawLine(new Pen(color,1),this.p1,this.p2); addArray.Add( new SharpType("DrawCurve", p1, p2, color, Color.Empty, Brushes.Black ) ); this.p1=this.p2; this.p2=this.p3; } } foreach( SharpType type in addArray ) { if(type.type=="DrawEllipse") { g.DrawEllipse( new Pen(type.foreColor,1), type.p1.X, type.p1.Y, Math.Abs( type.p1.X - type.p2.X ), Math.Abs( type.p1.Y - type.p2.Y ) ); } if(type.type=="DrawRectangle") { g.DrawRectangle(new Pen(type.foreColor,1), type.p1.X, type.p1.Y, Math.Abs( type.p1.X - type.p2.X ), Math.Abs( type.p1.Y - type.p2.Y ) ); } if(type.type=="DrawLine") { g.DrawLine(new Pen(type.foreColor,1),type.p1,type.p2); } if(type.type=="DrawCurve") { g.DrawLine(new Pen(type.foreColor,1),type.p1,type.p2); } } g.Dispose(); } private void pictureBox1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e) { this.isMouseDown = false; p2 = new Point( e.X, e.Y ); Graphics g = this.pictureBox1.CreateGraphics(); if(this.shape=="DrawEllipse") { g.DrawEllipse( new Pen(color,1), p1.X, p1.Y, Math.Abs( p1.X - p2.X ), Math.Abs( p1.Y - p2.Y ) ); addArray.Add( new SharpType( "DrawEllipse", p1, p2, color, Color.Empty, Brushes.Black ) ); } if(this.shape=="DrawRectangle") { g.DrawRectangle(new Pen(color,1), p1.X, p1.Y, Math.Abs( p1.X - p2.X ), Math.Abs( p1.Y - p2.Y ) );// addArray.Add( new SharpType("DrawRectangle", p1, p2, Color.Black, Color.Empty, Brushes.Black ) ); addArray.Add( new SharpType("DrawRectangle", p1, p2, color, Color.Empty, Brushes.Black ) ); } if(this.shape=="DrawLine") { g.DrawLine(new Pen(color,1),this.p1,this.p2); addArray.Add( new SharpType("DrawLine", p1, p2, color, Color.Empty, Brushes.Black ) ); } if(this.shape=="DrawCurve") { g.DrawLine(new Pen(color,1),this.p1,this.p2); addArray.Add( new SharpType("DrawCurve", p1, p2, color, Color.Empty, Brushes.Black ) );// this.p1=this.p2;// this.p2=this.p3; } p1 = Point.Empty; p2 = Point.Empty; g.Dispose(); } private void pictureBox1_Paint(object sender, System.Windows.Forms.PaintEventArgs e) { foreach( SharpType type in addArray ) { if(type.type=="DrawEllipse") { e.Graphics.DrawEllipse(new Pen(type.foreColor,1), type.p1.X, type.p1.Y, Math.Abs( type.p1.X - type.p2.X ), Math.Abs( type.p1.Y - type.p2.Y ) ); } if(type.type=="DrawRectangle") { e.Graphics.DrawRectangle( new Pen(type.foreColor,1), type.p1.X, type.p1.Y, Math.Abs( type.p1.X - type.p2.X ), Math.Abs( type.p1.Y - type.p2.Y ) ); } if(type.type=="DrawLine") { e.Graphics.DrawLine(new Pen(type.foreColor,1),type.p1,type.p2); } if(type.type=="DrawCurve") { e.Graphics.DrawLine(new Pen(type.foreColor,1),type.p1,type.p2); } } } private void button1_Click(object sender, System.EventArgs e) { shape="DrawRectangle"; } private void button2_Click(object sender, System.EventArgs e) { shape="DrawEllipse";// this.color=Color.Black; } private void button3_Click(object sender, System.EventArgs e) { shape="DrawLine"; } private void button4_Click(object sender, System.EventArgs e) { ColorDialog ColorDialog1 = new ColorDialog ( ) ; ColorDialog1.AllowFullOpen = true ; ColorDialog1.FullOpen = true ; //设定此颜色对话框存在"帮助"按钮，缺省是没有的 ColorDialog1.ShowHelp = true ; // 设定此颜色对话框的初始颜色，所以如果在对话框中选择"取消"，则此对话框会重新此颜色 ColorDialog1.Color = Color.Black ; if ( ColorDialog1.ShowDialog ( ) != DialogResult.Cancel ) { this.color = ColorDialog1.Color ; // showInfo ( ) ; } else { this.color=Color.Black; } } private void button5_Click(object sender, System.EventArgs e) { this.addArray.Clear(); this.pictureBox1.Refresh(); } private void button6_Click(object sender, System.EventArgs e) { shape="DrawCurve"; } }}