油漆方法闪烁
本文关键字:闪烁 方法 | 更新日期: 2023-09-27 18:01:51
考虑以下绘制函数(缩写):
public void paint(object sender, PaintEventArgs e)
{
base.OnPaint(e);
Graphics g = e.Graphics;
BufferedGraphicsContext context = BufferedGraphicsManager.Current;
BufferedGraphics buffer = context.Allocate(g, e.ClipRectangle);
buffer.Graphics.Clear(Color.PaleVioletRed);
// skip drawing if cond is true (condition is not relevant)
if(!cond)
{
try
{
// l is some List<p>
foreach(Point p in l)
{
// ...calculate X and Y... (not relevant)
buffer.Graphics.FillEllipse(new SolidBrush(Color.Blue), p.X,p.Y, Point.SIZE,Point.SIZE);
}
}
catch {} // some exception handling (not relevant)
finally{
buffer.Render(g);
}
}
buffer.Render(g);
}
注意,上面的代码或多或少是伪代码。我希望使用bufferedgraphics对象,闪烁会消失。事实上,它没有。起初,我认为paint-method会花费很长时间,但事实并非如此(我测量了每个调用的4-7毫秒)。如果我将cond
设置为true,尽管paint-method几乎不需要花费时间,但它仍然闪烁。重要的是,paint-method将在面板上进行绘制,并且我使用计时器大约每50毫秒使面板无效。我怎样才能最终消除闪烁?
试着在构造函数中设置这个属性:
this.DoubleBuffered = true;
那么你就不需要BufferedGraphics这些东西了:
public void paint(object sender, PaintEventArgs e)
{
base.OnPaint(e);
Graphics g = e.Graphics;
g.Clear(Color.PaleVioletRed);
// skip drawing if cond is true (condition is not relevant)
if(!cond)
{
// l is some List<p>
foreach(Point p in l)
{
// ...calculate X and Y... (not relevant)
g.FillEllipse(new SolidBrush(Color.Blue), p.X,p.Y, Point.SIZE,Point.SIZE);
}
}
}