Question

当在d2d中绘制带路径几何和弧段的弧时，与其他框架相比，会出现一些故障。我用d2d和wpf wpf vs d2d绘制的弧创建了一个缩放版本。我已经在direct2d中标记了未正确绘制的区域。有人知道是什么造成了这样的图纸吗？

示例代码（SharpDX）：

private static void TestRender(WindowRenderTarget renderTarget)
{
    var geo = new PathGeometry(d2dFactory);
    var sink = geo.Open();

    Vector2 off = new Vector2(40.0f, 70.0f);
    var arc_1 = new ArcSegment()
    {
        ArcSize = ArcSize.Small,
        RotationAngle = 0,
        Point = off,
        Size = new Size2F(22, 22),
        SweepDirection = SweepDirection.CounterClockwise
    };

    sink.BeginFigure(new SharpDX.Mathematics.Interop.RawVector2(84, 70), FigureBegin.Filled);
    sink.AddArc(arc_1);
    sink.EndFigure(FigureEnd.Open);

    sink.Close();

    StrokeStyle strokeStyle = new StrokeStyle(d2dFactory, new StrokeStyleProperties()
    {
        DashCap = CapStyle.Flat,
        DashStyle = DashStyle.Solid,
        LineJoin = LineJoin.Miter,
        StartCap = CapStyle.Flat,
        EndCap = CapStyle.Flat,
        MiterLimit = 0,
        DashOffset = 0
    }, new float[0]);

    var testBrush = new SharpDX.Direct2D1.SolidColorBrush(
        renderTarget,
        new SharpDX.Mathematics.Interop.RawColor4(1.0f, 0.0f, 0.0f, 1.0f),
        new SharpDX.Direct2D1.BrushProperties
        {
            Opacity = 1.0f,
        }
    );

    renderTarget.DrawGeometry(geo, testBrush, 10, strokeStyle);
    geo.Dispose();
    sink.Dispose();

}

在挖了一下之后，我发现如果我将起点移到y方向的一半“像素”，一切看起来都不错。现在的问题是如何编程确定需要转换哪些坐标。此外，我想知道wpf是如何做到这一点的。我知道UseLayoutRounding和SnapToPixels。我很感兴趣他们（MS）如何为各种形状做这件事。

Direct2D绘制弧缺少像素和刺激性抗锯齿

0 个答案: