C#中用“橡皮条”法绘图和重绘
前些日子在论坛上发了个帖子,100分寻求“橡皮条”法绘图的代码。效果不是很好,于是自己参照网友给的代码重新写了一个,解决了绘图与重绘的问题。由于只写了部分,所以功能有限,同时可能算法不是很好,希望大家指点!!窗体中仅包含一个pictrueBox1,先将代码付诸于下: using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; using System.Drawing.Drawing2D;
namespace GDI_练习 { /// <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 bool isMouseDown = false, isMouseUp = false; ArrayList addArray = new ArrayList(); 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; }
}
/// <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.SuspendLayout(); // // pictureBox1 // this.pictureBox1.BackColor = System.Drawing.Color.White; this.pictureBox1.Dock = System.Windows.Forms.DockStyle.Fill; 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); // // Form1 // this.AutoScaleBaseSize = new System.Drawing.Size(6, 14); this.ClientSize = new System.Drawing.Size(432, 397); 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 ) g.DrawEllipse( Pens.White, p1.X, p1.Y, Math.Abs( p1.X - p2.X ), Math.Abs( p1.Y - p2.Y ) );
if( isMouseDown && ! isMouseUp ) { p2 = new Point( e.X, e.Y ); g.DrawEllipse( Pens.Black, p1.X, p1.Y, Math.Abs( p1.X - p2.X ), Math.Abs( p1.Y - p2.Y ) );
} foreach( SharpType type in addArray ) { g.DrawEllipse( Pens.Black, type.p1.X, type.p1.Y, Math.Abs( type.p1.X - type.p2.X ), Math.Abs( type.p1.Y - type.p2.Y ) );
} 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(); g.DrawEllipse( Pens.Black, p1.X, p1.Y, Math.Abs( p1.X - p2.X ), Math.Abs( p1.Y - p2.Y ) ); addArray.Add( new SharpType( "a", p1, p2, Color.Black, Color.Empty, Brushes.Black ) ); p1 = Point.Empty; p2 = Point.Empty; g.Dispose(); }
private void pictureBox1_Paint(object sender, System.Windows.Forms.PaintEventArgs e) { foreach( SharpType type in addArray ) { e.Graphics.DrawEllipse( Pens.Black, type.p1.X, type.p1.Y, Math.Abs( type.p1.X - type.p2.X ), Math.Abs( type.p1.Y - type.p2.Y ) );
} }
} }

|