| 发表于：2007-03-15 17:30:486楼 得分:20 |
给你个画图的例子参考下：
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 <lineobj> linelist = new list <lineobj> （);
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);
}
}
} | | |
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