缓冲图形闪烁
本文关键字:闪烁 图形 缓冲 | 更新日期: 2023-09-27 17:56:26
我尝试实现自定义双缓冲,但它会导致闪烁。
这是控件(从控件继承的自定义控件)构造函数中的代码:
bufferContext = new BufferedGraphicsContext();
SetStyle(ControlStyles.OptimizedDoubleBuffer, false);
SetStyle(ControlStyles.DoubleBuffer, false);
SetStyle(ControlStyles.ResizeRedraw, false);
SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint, true);
SetStyle(ControlStyles.Opaque, true);
上漆事件:
protected override void OnPaint(PaintEventArgs e)
{
if (buffer == null)
{
Draw(e);
return;
}
if (Repaint)
{
Repaint = false;
PaintEventArgs pe = new PaintEventArgs(buffer.Graphics, e.ClipRectangle);
Draw(pe);
}
buffer.Render(e.Graphics);
}
此外,此代码在调整与缓冲相关的大小时激活:
Graphics g = this.CreateGraphics();
if (buffer != null)
{
buffer.Dispose();
buffer = null;
}
if (!(bufferContext == null || DisplayRectangle.Width <= 0 || DisplayRectangle.Height <= 0))
{
buffer = bufferContext.Allocate(g, DisplayRectangle);
Repaint = true;
}
绘制方法很复杂,但它首先用 BackColor 填充控件,其他则无关紧要。
我可以用眼睛发现有时会闪烁,主要是在调整窗口大小时。正如我所感知的那样,黑色首先被涂成控制,然后是缓冲区中的图形,它会导致闪烁。但是,背景色从来都不是黑色的。
如何阻止这种情况?
此示例演示如何正确使用缓冲图形:
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace GDI_PAINTING_EXAMPLE
{
public class PaintingExample : Control
{
public Graphics G;
public Bitmap Frame = new Bitmap(256, 256);
public Bitmap Buffer = new Bitmap(256, 256);
public PaintingExample()
{
// Create a new Graphics instance.
G = Graphics.FromImage(Buffer);
}
protected override void OnPaint(PaintEventArgs e)
{
// Clears Buffer To White
G.Clear(Color.White);
//
// Do Your Painting Routine
//
//
// End Your Painting Routine
//
// Set Frame to draw as Buffer
Frame = Buffer;
// Draw Frame with Paint Event Graphics as one image.
e.Graphics.DrawImage(Frame, new Point(0, 0));
}
protected override void OnPaintBackground(PaintEventArgs pevent)
{
}
}
}