我需要在画布的背景上绘制网格线,并在其上放置其他控件.
我尝试创建一个StreamGeometry,使用它绘制线条,并将其分配给DrawingBrush.但是我发现,如果StreamGeometry有太多行,则在将DrawingBrush分配给Canvas后,程序会变得迟缓.
无论如何都有"预渲染"网格线并将其分配给Canvas？
我尝试Freeze()了刷子和几何,但似乎没有用.我还有其他选择吗？
这是我的代码:
public void RenderGrid()
{
this.UpdateGrid();
Pen grid_pen = new Pen(Brushes.Blue, 0.1);
StreamGeometry sg = new StreamGeometry();
DrawingBrush b = new DrawingBrush();
GeometryDrawing gd = new GeometryDrawing();
gd.Geometry = sg;
gd.Pen = grid_pen;
b.Drawing = gd;
StreamGeometryContext ctx = sg.Open();
foreach (double d in this.VerticalGrids)
{
ctx.BeginFigure(new Point(d, 0), true, false);
ctx.LineTo(new Point(d, this.RenderSize.Height), true,false);
}
foreach (double d in this.HorizontalGrids)
{
ctx.BeginFigure(new Point(0, d), true, false);
ctx.LineTo(new Point(this.RenderSize.Width, d),true, false);
}
ctx.Close();
sg.Freeze();
gd.Freeze();
b.Freeze();
this.Background = b;
}