Question

我正在使用ArcGIS Runtime .NET Quartz Beta

我有一个需要在3D场景视图上渲染大型多边形的应用程序。

例如，我执行此代码：

            var ContourOverlayScene = CreateGraphicsOverlay("Contours");
            MySceneView.GraphicsOverlays.Add(ContourOverlayScene);


            List<MapPoint> combined = new List<MapPoint>();

            combined.Add(new MapPoint(-160,  20, wgs84));
            combined.Add(new MapPoint( 160,  20, wgs84));
            combined.Add(new MapPoint( 160, -20, wgs84));
            combined.Add(new MapPoint(-160, -20, wgs84));

            var arcpoly = new Esri.ArcGISRuntime.Geometry.Polygon(combined, wgs84);

            ContourOverlayScene.Graphics.Add(new Graphic() { Geometry = arcpoly, Symbol = new SimpleFillSymbol() { Color = Colors.Red } });

给了我这个结果（我期待多边形在全球范围内大部分包裹）

所以，我把它改成了中间点，试图强迫它环游世界，就像这样：

            combined.Add(new MapPoint(-160,  20, wgs84));
            combined.Add(new MapPoint(-40, 20, wgs84));
            combined.Add(new MapPoint(40, 20, wgs84));
            combined.Add(new MapPoint( 160,  20, wgs84));
            combined.Add(new MapPoint( 160, -20, wgs84));
            combined.Add(new MapPoint(40, -20, wgs84));
            combined.Add(new MapPoint(-40, -20, wgs84));
            combined.Add(new MapPoint(-160, -20, wgs84));

，结果图片完全相同....

如何渲染我想渲染的多边形？

Answer 1

这是3D渲染器中的错误。我找到的唯一方法就是创建两个图形，每个图形必须小于180度。当创建具有两个部分的单个多边形（轮廓正确呈现但填充仍然错误）时，它甚至不起作用

        var pb = new PolygonBuilder(wgs84);
        combined.Add(new MapPoint(-160, 20, wgs84));
        combined.Add(new MapPoint(0, 20, wgs84));
        combined.Add(new MapPoint(0, -20, wgs84));
        combined.Add(new MapPoint(-160, -20, wgs84));
        pb.AddPart(combined);

        ContourOverlayScene.Graphics.Add(new Graphic() { Geometry = GeometryEngine.Densify(pb.ToGeometry(),1), Symbol = new SimpleFillSymbol() { Color = Colors.Red } });

        pb = new PolygonBuilder(wgs84);

        combined = new List<MapPoint>();
        combined.Add(new MapPoint(0, 20, wgs84));
        combined.Add(new MapPoint(160, 20, wgs84));
        combined.Add(new MapPoint(160, -20, wgs84));
        combined.Add(new MapPoint(0, -20, wgs84));
        pb.AddPart(combined);

        ContourOverlayScene.Graphics.Add(new Graphic() { Geometry = GeometryEngine.Densify(pb.ToGeometry(), 1), Symbol = new SimpleFillSymbol() { Color = Colors.Red } });

我在ArcGIS Runtime中记录了一个错误，所以希望这可以修复 - 但是目前的部分＆gt; 180将在设计中采用3D方式，因此您可能仍需要将几何体分成两部分。

大多边形渲染不正确

1 个答案: