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文件大小: 25kb
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上传时间: 2009-03-10
详细说明： using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Text; using System.Windows.Forms; namespace DoubleBufferDraw { public partial class DrawLine : Form { class LineObj { private Point m_start; private Point m_end; public LineObj(Point start, Point end) { this.m_start = start; this.m_end = end; } public void Draw(Graphics g, Pen pen) { g.DrawLine(pen, m_start, m_end); } } private Point m_startPoint = Point.Empty; List lineList = new Li st(); public DrawLine() { InitializeComponent(); } private void drawLine(Graphics graphics, Point startPoint, Point endPoint) { BufferedGraphicsContext context = BufferedGraphicsManager.Current; BufferedGraphics bg = context.Allocate(graphics, this.ClientRectangle); bg.Graphics.Clear(this.BackColor); foreach (LineObj line in this.lineList) { line.Draw(bg.Graphics, SystemPens.ControlText); } bg.Graphics.DrawLine(SystemPens.ControlText, startPoint, endPoint); bg.Render(); bg.Dispose(); bg = null; } protected override void OnPaint(PaintEventArgs e) { base.OnPaint(e); foreach (LineObj line in this.lineList) { line.Draw(e.Graphics, SystemPens.ControlText); } } protected override void OnMouseDown(MouseEventArgs e) { base.OnMouseDown(e); this.m_startPoint = new Point(e.X, e.Y); } protected override void OnMouseMove(MouseEventArgs e) { base.OnMouseMove(e); if (e.Button == MouseButtons.Left) { this.drawLine(this.CreateGraphics(), this.m_startPoint, new Point(e.X, e.Y)); } } protected override void OnMouseUp(MouseEventArgs e) { base.OnMouseUp(e); LineObj line = new LineObj(this.m_startPoint, e.Location); this.lineList.Add(line); } } } ...展开收缩
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