Library code snippets
An AutoRedraw Property
By Michael H, published on 05 Sep 2003
This demonstrates an autoredraw property in .NET to play around with!
using System;
using System.Diagnostics;
using System.Collections;
using System.Windows.Forms;
using System.Drawing;
using System.IO;
public class AutoRedrawForm : Form {
private Bitmap b;
public AutoRedrawForm() {
b = new Bitmap(this.ClientSize.Width,this.ClientSize.Height);
this.Resize += new EventHandler(this_Resize);
this.Paint += new PaintEventHandler(this_Paint);
}
private void this_Paint(object s,PaintEventArgs e) {
if(autoredraw) {
Graphics g = base.CreateGraphics();
g.DrawImage(b,0,0);
}
}
private void this_Resize(object s,EventArgs e) {
if(this.ClientSize.Width>b.Width && this.ClientSize.Height>b.Height) {
Bitmap c = new Bitmap(this.ClientSize.Width,this.ClientSize.Height);
Graphics g = Graphics.FromImage(c);
g.DrawImage(b,0,0);
b = c;
g.Dispose();
}
}
private bool autoredraw;
public bool AutoRedraw {
get { return autoredraw; }
set { autoredraw = value; }
}
public new Graphics CreateGraphics() {
if(autoredraw) {
return Graphics.FromImage(b);
}
return base.CreateGraphics();
}
}
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