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我希望以前没有问过这个问题，我到处搜索。

我的问题是我在我的 wpf 用户控件上用点绘制了一组坐标，我设法用背景颜色而不是笔划填充我的多边形。斯托克因为某种原因不画画？

这是我在 OnRender 事件中使用 DrawingContext 的代码

System.Windows.Media.Pen penDrawing = new System.Windows.Media.Pen(System.Windows.Media.Brushes.OrangeRed, 2);

                            drawingContext.DrawGeometry(System.Windows.Media.Brushes.LightSeaGreen, penDrawing, streamGeometry);

代码详细

StreamGeometry streamGeometry = new StreamGeometry();

System.Windows.Point firstCoordinate = new System.Windows.Point();

System.Windows.Point lastCoordinateAdded = new System.Windows.Point();

bool isMainPolygon = true;

using (StreamGeometryContext geometryContext = streamGeometry.Open())
{
    PointCollection points = new PointCollection();

    firstCoordinate = new System.Windows.Point(coordinatePoints.ProjectedCoordinates[0].X, coordinatePoints.ProjectedCoordinates[0].Y);

    geometryContext.BeginFigure(firstCoordinate, true, true);

    System.Windows.Media.Pen penDrawing = new System.Windows.Media.Pen(System.Windows.Media.Brushes.OrangeRed, 5);

    penDrawing.EndLineCap = PenLineCap.Round;

    penDrawing.DashCap = PenLineCap.Round;

    penDrawing.LineJoin = PenLineJoin.Round;

    penDrawing.StartLineCap = PenLineCap.Round;

    penDrawing.MiterLimit = 10.0;

    for (int i = 1; i < coordinatePoints.ProjectedCoordinates.Count; i++)
    {
        lastCoordinateAdded = new System.Windows.Point() { X = coordinatePoints.ProjectedCoordinates[i].X, Y = coordinatePoints.ProjectedCoordinates[i].Y };

        points.Add(lastCoordinateAdded);

        //////Check to see if Polygon is done drawing
        if (firstCoordinate == lastCoordinateAdded)
        {
            geometryContext.PolyLineTo(points, true, true);

            //drawingContext.DrawGeometry(isMainPolygon ? System.Windows.Media.Brushes.Green : System.Windows.Media.Brushes.White, pen, streamGeometry);

            streamGeometry.Freeze();

            drawingContext.DrawGeometry(null, penDrawing, streamGeometry);

            points = new PointCollection();

            streamGeometry = new StreamGeometry();

            if (i + 1 < coordinatePoints.ProjectedCoordinates.Count)
            {
                i++;

                isMainPolygon = false;

                firstCoordinate = new System.Windows.Point(coordinatePoints.ProjectedCoordinates[i].X, coordinatePoints.ProjectedCoordinates[i].Y);

                geometryContext.BeginFigure(firstCoordinate, true, true);
            }
        }
    }

    geometryContext.PolyLineTo(points, true, true);
}

coordinatePoints.State = Enums.CoordinateEnum.None;

}

我很乐意提供更多细节。

太感谢了。

4

2 回答 2

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创建几何图形时，请确保stroked在方法上设置参数StreamGeometryContext.LineTo。

// Draw a line to the next specified point.
ctx.LineTo(new Point(100, 100), true /* is stroked */, false /* is smooth join */);
//                              ↑
//                              This parameter needs to be true.
于 2014-02-13T14:13:09.273 回答
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与所有内容一样，WPF 会缩放线条的宽度，因此如果笔触宽度相对于几何体的范围太窄，笔触可能会变得不可见。

于 2014-02-14T20:46:12.803 回答