Question

我的WPF绘图性能有问题。有许多小的EllipseGeometry对象（例如1024个椭圆），它们被添加到具有不同前景画笔的三个单独的GeometryGroup中。之后，我在简单的图像控件上渲染它。代码：

DrawingGroup tmpDrawing = new DrawingGroup();
GeometryGroup onGroup = new GeometryGroup();
GeometryGroup offGroup = new GeometryGroup();
GeometryGroup disabledGroup = new GeometryGroup();

for (int x = 0; x < DisplayWidth; ++x)
{
    for (int y = 0; y < DisplayHeight; ++y)
    {
        if (States[x, y] == true) onGroup.Children.Add(new EllipseGeometry(new Rect((double)x * EDGE, (double)y * EDGE, EDGE, EDGE)));
        else if (States[x, y] == false) offGroup.Children.Add(new EllipseGeometry(new Rect((double)x * EDGE, (double)y * EDGE, EDGE, EDGE)));
        else disabledGroup.Children.Add(new EllipseGeometry(new Rect((double)x * EDGE, (double)y * EDGE, EDGE, EDGE)));
    }
}

tmpDrawing.Children.Add(new GeometryDrawing(OnBrush, null, onGroup));
tmpDrawing.Children.Add(new GeometryDrawing(OffBrush, null, offGroup));
tmpDrawing.Children.Add(new GeometryDrawing(DisabledBrush, null, disabledGroup));
DisplayImage.Source = new DrawingImage(tmpDrawing);

它工作正常，但需要花费太多时间 - 在Core 2 Quad上大于0.5秒，在Pentium 4上大于2秒。我需要＆lt; 0.1s无处不在。你可以看到的所有椭圆都是平等的。控件的背景，我的DisplayImage，是固体（例如黑色），所以我们可以使用这个事实。我尝试使用1024个Ellipse元素而不是使用EllipseGeometries的Image，并且它工作得更快（~0.5s），但还不够。如何加快它？

此致 Oleg Eremeev

P.S。抱歉我的英文。

Answer 1

我离开了旧的渲染方法，但每次创建新的EllipseGeometry对象都是个坏主意，所以我用这种方式优化它：

for (int x = 0; x < newWidth; ++x)
{
    for (int y = 0; y < newHeight; ++y)
    {
        States[x, y] = null;
        OnEllipses[x, y] = new EllipseGeometry(new Rect((double)x * EDGE + 0.5f, (double)y * EDGE + 0.5f, EDGE - 1f, EDGE - 1f));
        OffEllipses[x, y] = new EllipseGeometry(new Rect((double)x * EDGE + 0.5f, (double)y * EDGE + 0.5f, EDGE - 1f, EDGE - 1f));
        DisabledEllipses[x, y] = new EllipseGeometry(new Rect((double)x * EDGE + 0.5f, (double)y * EDGE + 0.5f, EDGE - 1f, EDGE - 1f));
    }
}

// . . .

DrawingGroup tmpDrawing = new DrawingGroup();
GeometryGroup onGroup = new GeometryGroup();
GeometryGroup offGroup = new GeometryGroup();
GeometryGroup disabledGroup = new GeometryGroup();

for (int x = 0; x < DisplayWidth; ++x)
{
    for (int y = 0; y < DisplayHeight; ++y)
    {
        if (States[x, y] == true) onGroup.Children.Add(OnEllipses[x, y]);
        else if (States[x, y] == false) offGroup.Children.Add(OffEllipses[x, y]);
        else disabledGroup.Children.Add(DisabledEllipses[x, y]);
    }
}

tmpDrawing.Children.Add(new GeometryDrawing(OnBrush, null, onGroup));
tmpDrawing.Children.Add(new GeometryDrawing(OffBrush, null, offGroup));
tmpDrawing.Children.Add(new GeometryDrawing(DisabledBrush, null, disabledGroup));
DisplayImage.Source = new DrawingImage(tmpDrawing);

对于x = 128和y = 8，即使在奔腾III系统上也能正常运行。

Answer 2

即使我有点迟了，Charles Petzold的This帖子在类似情况下帮了很多。

具有大量几何形状的WPF绘图性能

2 个答案: