Чтобы изображение не мерцало при перерисовке, нужно выставить у контрола (в данном случае - у панели) стиль ControlStyles.AllPaintingInWmPaint | ControlStyles.DoubleBuffer. Пример с двигающимися линиями:
FlickerFreePanel.cs
| Код | using System;
using System.Collections;
using System.Drawing;
using System.Windows.Forms;
namespace MyControls
{
public class FlickerFreePanel : Panel
{
public FlickerFreePanel()
{
base.SetStyle(ControlStyles.AllPaintingInWmPaint|ControlStyles.DoubleBuffer, true);
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint (e);
foreach(Rectangle rect in _rects)
e.Graphics.DrawLine(Pens.Black, rect.Location, rect.Location+rect.Size);
}
// пример
public void AddLine(Rectangle rect)
{
_rects.Add(rect);
this.Refresh();
}
public Rectangle GetLine(int iLine)
{
return (Rectangle)_rects[iLine];
}
public void MoveLine(int iLine, Rectangle newCoords)
{
_rects[iLine] = newCoords;
this.Refresh();
}
ArrayList _rects = new ArrayList();
}
} |
Form1.cs
| Код | using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
namespace WindowsApplication1
{
/// <summary>
/// Summary description for Form1.
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
protected override void OnLoad(EventArgs e)
{
base.OnLoad (e);
Random rnd = new Random();
for(int i=0; i<10; i++)
this.flickerFreePanel1.AddLine(new Rectangle(rnd.Next(150), rnd.Next(150), rnd.Next(150), rnd.Next(150)));
this.timer1.Start();
}
private void timer1_Tick(object sender, System.EventArgs e)
{
Random rnd = new Random();
for(int i=0; i<10; i++)
{
Rectangle rect = this.flickerFreePanel1.GetLine(i);
int x1 = rect.Left + rnd.Next(3) - 1;
int y1 = rect.Top + rnd.Next(3) - 1;
int x2 = rect.Right + rnd.Next(3) - 1;
int y2 = rect.Bottom + rnd.Next(3) - 1;
this.flickerFreePanel1.MoveLine(i, new Rectangle(x1, y1, x2-x1, y2-y1));
}
}
private MyControls.FlickerFreePanel flickerFreePanel1;
private System.Windows.Forms.Timer timer1;
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