// Clips feature geometries with a user defined clipping rectangle. private async void ClipButton_Click(object sender, RoutedEventArgs e) { try { _clippedGraphicsOverlay.Graphics.Clear(); // wait for user to draw clip rect var rect = await MyMapView.Editor.RequestShapeAsync(DrawShape.Rectangle); Polygon polygon = GeometryEngine.NormalizeCentralMeridian(rect) as Polygon; // get intersecting features from the feature layer SpatialQueryFilter filter = new SpatialQueryFilter(); filter.Geometry = GeometryEngine.Project(polygon, _statesLayer.FeatureTable.SpatialReference); filter.SpatialRelationship = SpatialRelationship.Intersects; filter.MaximumRows = 52; var stateFeatures = await _statesLayer.FeatureTable.QueryAsync(filter); // Clip the feature geometries and add to graphics layer var states = stateFeatures.Select(feature => feature.Geometry); var clipGraphics = states .Select(state => GeometryEngine.Clip(state, polygon.Extent)) .Select(geo => new Graphic(geo, _clipSymbol)); _clippedGraphicsOverlay.Graphics.AddRange(clipGraphics); } catch (TaskCanceledException) { } catch (Exception ex) { var _x = new MessageDialog("Clip Error: " + ex.Message, "Clip Geometry").ShowAsync(); } }
private void ClipButton_Click(object sender, EventArgs e) { try { // Remove the Colorado graphic from the input geometries graphics overlay collection. That way it will be easier // to see the clip versions of the GeometryEngine.Clip operation. _inputGeometriesGraphicsOverlay.Graphics.Remove(_coloradoGraphic); // Loop through each graphic in the input geometries for the clip operation. foreach (Graphic oneGraphic in _inputGeometriesGraphicsOverlay.Graphics) { // Perform the clip operation. The first parameter of the clip operation will always be the Colorado graphic. // The second parameter of the clip operation will be one of the 3 different clip geometries (_outsideGraphic, // _containedGraphic, or _intersectingGraphic). Geometry myGeometry = GeometryEngine.Clip(_coloradoGraphic.Geometry, (Envelope)oneGraphic.Geometry); // Only work on returned geometries that are not null. if (myGeometry != null) { // Create the graphic as a result of the clip operation using the same symbology that was defined for // the _coloradoGraphic defined in the Initialize() method previously. Graphic clippedGraphic = new Graphic(myGeometry, _coloradoGraphic.Symbol); // Add the clipped graphic to the clip areas graphics overlay collection. _clipAreasGraphicsOverlay.Graphics.Add(clippedGraphic); } } // Disable the button after has been used. _clipButton.Enabled = false; } catch (System.Exception ex) { // Display an error message if there is a problem generating clip operation. AlertDialog.Builder alertBuilder = new AlertDialog.Builder(this); alertBuilder.SetTitle("There was a problem clipping the geometery."); alertBuilder.SetMessage(ex.ToString()); alertBuilder.Show(); } }
private void ClipButton_TouchUpInside(object sender, EventArgs e) { try { // Remove the Colorado graphic from the input geometries graphics overlay collection. That way it will be easier // to see the clip versions of the GeometryEngine.Clip operation. _inputGeometriesGraphicsOverlay.Graphics.Remove(_coloradoGraphic); // Loop through each graphic in the input geometries for the clip operation. foreach (Graphic oneGraphic in _inputGeometriesGraphicsOverlay.Graphics) { // Perform the clip operation. The first parameter of the clip operation will always be the Colorado graphic. // The second parameter of the clip operation will be one of the 3 different clip geometries (_outsideGraphic, // _containedGraphic, or _intersectingGraphic). Geometry myGeometry = GeometryEngine.Clip(_coloradoGraphic.Geometry, (Envelope)oneGraphic.Geometry); // Only work on returned geometries that are not null. if (myGeometry != null) { // Create the graphic as a result of the clip operation using the same symbology that was defined for // the _coloradoGraphic defined in the Initialize() method previously. Graphic clippedGraphic = new Graphic(myGeometry, _coloradoGraphic.Symbol); // Add the clipped graphic to the clip areas graphics overlay collection. _clipAreasGraphicsOverlay.Graphics.Add(clippedGraphic); } } // Disable the button after has been used. _clipButton.Enabled = false; } catch (System.Exception ex) { // Display an error message if there is a problem generating clip operation. UIAlertController alertController = UIAlertController.Create("Geometry Engine Failed!", ex.Message, UIAlertControllerStyle.Alert); alertController.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null)); PresentViewController(alertController, true, null); return; } }
// myMapView 事件 private async void MyMapView_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { IInputElement ie = (IInputElement)(sender); MapPoint loc = myMapView.ScreenToLocation(e.GetPosition(ie)); switch (operation) { case OperateType.DrawPoint: //画点 Graphic pt = new Graphic(loc, pointSymbol); graphicsLayer.Graphics.Add(pt); break; case OperateType.DrawPolyline: //画线 pointCollection.Add(loc); if (pointCollection.Count >= 2) { if (pointCollection.Count > 2) { Graphic g = graphicsLayer.Graphics[graphicsLayer.Graphics.Count - 1]; PolylineBuilder lb = new PolylineBuilder(pointCollection); g.Geometry = lb.ToGeometry(); } else { Esri.ArcGISRuntime.Geometry.Polyline l = new Esri.ArcGISRuntime.Geometry.Polyline(pointCollection); Graphic lg = new Graphic(l, lineSymbol); graphicsLayer.Graphics.Add(lg); } } break; case OperateType.DrawPolygon: //画多边形 pointCollection.Add(loc); if (pointCollection.Count >= 3) { if (pointCollection.Count > 3) { Graphic g = graphicsLayer.Graphics[graphicsLayer.Graphics.Count - 1]; PolygonBuilder pb = new PolygonBuilder(pointCollection); g.Geometry = pb.ToGeometry(); } else { Esri.ArcGISRuntime.Geometry.Polygon p = new Esri.ArcGISRuntime.Geometry.Polygon(pointCollection); Graphic pg = new Graphic(p, fillSymbol); graphicsLayer.Graphics.Add(pg); } } break; case OperateType.None: //缺省状态 graphicsLayer.ClearSelection(); IdentifyGraphicsOverlayResult result = await myMapView.IdentifyGraphicsOverlayAsync(graphicsLayer, e.GetPosition(ie), 5, false); //选择图形元素 if (result.Graphics.Count < 1) { curSelGraphic = null; EditVertexMenuItem.IsEnabled = false; UneditVertexMenuItem.IsEnabled = false; return; } curSelGraphic = result.Graphics.First(); curSelGraphic.IsSelected = true; EditVertexMenuItem.IsEnabled = true; break; case OperateType.Cal_Clip: //选择图形 IdentifyGraphicsOverlayResult gResult = await myMapView.IdentifyGraphicsOverlayAsync(graphicsLayer, e.GetPosition(ie), 5, false); if (gResult.Graphics.Count < 1) { return; } Graphic selGraphic = gResult.Graphics.First(); selGraphic.IsSelected = true; listOfClipGraphics.Add(selGraphic); //记录所选图形 if (listOfClipGraphics.Count == 2) //图形数目为2时,进行剪切计算 { Graphic g1 = listOfClipGraphics[0]; Graphic g2 = listOfClipGraphics[1]; if (g1.Geometry.GeometryType != GeometryType.Polygon || g2.Geometry.GeometryType != GeometryType.Polygon) //如果所选图形不是多边形,则退出 { MessageBox.Show("请选择两个多边形图形!"); listOfClipGraphics.Clear(); graphicsLayer.ClearSelection(); return; } Esri.ArcGISRuntime.Geometry.Geometry resultGeometry = GeometryEngine.Clip(g1.Geometry, g2.Geometry.Extent); //执行剪切操作 if (resultGeometry != null) //处理结果 { graphicsLayer.Graphics.Remove(g1); //从图形层中移除原图形 graphicsLayer.Graphics.Remove(g2); Graphic clipedGraphic = new Graphic(resultGeometry, fillSymbol); //利 用剪切结果构建新的图形 graphicsLayer.Graphics.Add(clipedGraphic); operation = OperateType.None; } listOfClipGraphics.Clear(); //清空图形选择集合 graphicsLayer.ClearSelection(); //清空图形层所选 } break; case OperateType.Cal_Union: // 联合 IdentifyGraphicsOverlayResult gResultUnion = await myMapView.IdentifyGraphicsOverlayAsync(graphicsLayer, e.GetPosition(ie), 5, false); if (gResultUnion.Graphics.Count < 1) { return; } Graphic selGraphicUnion = gResultUnion.Graphics.First(); selGraphicUnion.IsSelected = true; listOfClipGraphics.Add(selGraphicUnion); //记录所选图形 if (listOfClipGraphics.Count == 2) //图形数目为2时,进行剪切计算 { Graphic g1 = listOfClipGraphics[0]; Graphic g2 = listOfClipGraphics[1]; if (g1.Geometry.GeometryType != GeometryType.Polygon || g2.Geometry.GeometryType != GeometryType.Polygon) //如果所选图形不是多边形,则退出 { MessageBox.Show("请选择两个多边形图形!"); listOfClipGraphics.Clear(); graphicsLayer.ClearSelection(); return; } Esri.ArcGISRuntime.Geometry.Geometry resultGeometry = GeometryEngine.Union(g1.Geometry, g2.Geometry.Extent); //执行剪切操作 if (resultGeometry != null) //处理结果 { graphicsLayer.Graphics.Remove(g1); //从图形层中移除原图形 graphicsLayer.Graphics.Remove(g2); Graphic clipedGraphic = new Graphic(resultGeometry, fillSymbol); //利 用剪切结果构建新的图形 graphicsLayer.Graphics.Add(clipedGraphic); operation = OperateType.None; } listOfClipGraphics.Clear(); //清空图形选择集合 graphicsLayer.ClearSelection(); //清空图形层所选 } break; case OperateType.Cal_Cut: // 剪切 IdentifyGraphicsOverlayResult gResult_Cut = await myMapView.IdentifyGraphicsOverlayAsync(graphicsLayer, e.GetPosition(ie), 5, false); if (gResult_Cut.Graphics.Count < 1) { return; } Graphic selGraphic_Cut = gResult_Cut.Graphics.First(); selGraphic_Cut.IsSelected = true; listOfClipGraphics.Add(selGraphic_Cut); //记录所选图形 if (listOfClipGraphics.Count == 2) //图形数目为1时,进行剪切计算 { Graphic g1 = listOfClipGraphics[0]; Graphic g2 = listOfClipGraphics[1]; if (g1.Geometry.GeometryType != GeometryType.Polygon || g2.Geometry.GeometryType != GeometryType.Polyline) //如果所选图形不是多边形,则退出 { MessageBox.Show("请先选择一个面要素后再选择一个线要素."); listOfClipGraphics.Clear(); graphicsLayer.ClearSelection(); return; } Esri.ArcGISRuntime.Geometry.Polyline polyLine = (Esri.ArcGISRuntime.Geometry.Polyline)g2.Geometry; Esri.ArcGISRuntime.Geometry.Geometry[] resultGeometry = GeometryEngine.Cut(g1.Geometry, polyLine); //执行剪切操作 if (resultGeometry != null) //处理结果 { graphicsLayer.Graphics.Remove(g1); for (int z = 0; z < resultGeometry.Length; z++) { Graphic clipedGraphic = new Graphic(resultGeometry[z], fillSymbol); //利 用剪切结果构建新的图形 graphicsLayer.Graphics.Add(clipedGraphic); } operation = OperateType.None; } listOfClipGraphics.Clear(); //清空图形选择集合 graphicsLayer.ClearSelection(); //清空图形层所选 } break; case OperateType.Cal_Simplify: // 拓扑纠正 IdentifyGraphicsOverlayResult gResult_Simplify = await myMapView.IdentifyGraphicsOverlayAsync(graphicsLayer, e.GetPosition(ie), 5, false); if (gResult_Simplify.Graphics.Count < 1) { return; } Graphic selGraphic_Simplify = gResult_Simplify.Graphics.First(); selGraphic_Simplify.IsSelected = true; listOfClipGraphics.Add(selGraphic_Simplify); //记录所选图形 if (listOfClipGraphics.Count == 1) //图形数目为1时,进行剪切计算 { Graphic g1 = listOfClipGraphics[0]; if (g1.Geometry.GeometryType == GeometryType.Point) //如果所选图形不是多边形,则退出 { MessageBox.Show("请先选择一个面要素或线要素."); listOfClipGraphics.Clear(); graphicsLayer.ClearSelection(); return; } Esri.ArcGISRuntime.Geometry.Geometry resultGeometry = GeometryEngine.Simplify(g1.Geometry); //执行剪切操作 if (resultGeometry != null) //处理结果 { graphicsLayer.Graphics.Remove(g1); //从图形层中移除原图形 Graphic clipedGraphic = new Graphic(resultGeometry, fillSymbol); //利 用剪切结果构建新的图形 graphicsLayer.Graphics.Add(clipedGraphic); operation = OperateType.None; } listOfClipGraphics.Clear(); //清空图形选择集合 graphicsLayer.ClearSelection(); //清空图形层所选 } break; case OperateType.Cal_Gene: // 简化 IdentifyGraphicsOverlayResult gResult_Gene = await myMapView.IdentifyGraphicsOverlayAsync(graphicsLayer, e.GetPosition(ie), 5, false); if (gResult_Gene.Graphics.Count < 1) { return; } Graphic selGraphic_Gene = gResult_Gene.Graphics.First(); selGraphic_Gene.IsSelected = true; listOfClipGraphics.Add(selGraphic_Gene); //记录所选图形 if (listOfClipGraphics.Count == 1) //图形数目为1时 { Graphic g1 = listOfClipGraphics[0]; if (g1.Geometry.GeometryType == GeometryType.Point) //如果所选图形是点,则退出 { MessageBox.Show("请先选择一个面要素或线要素."); listOfClipGraphics.Clear(); graphicsLayer.ClearSelection(); return; } Esri.ArcGISRuntime.Geometry.Geometry resultGeometry = GeometryEngine.Generalize(g1.Geometry, 1000000.0, true); //执行剪切操作 if (resultGeometry != null) //处理结果 { MessageBox.Show(resultGeometry.ToJson() + "\n" + resultGeometry.GeometryType); graphicsLayer.Graphics.Remove(g1); //从图形层中移除原图形 Graphic clipedGraphic = new Graphic(resultGeometry, fillSymbol); //利 用剪切结果构建新的图形 graphicsLayer.Graphics.Add(clipedGraphic); operation = OperateType.None; } listOfClipGraphics.Clear(); //清空图形选择集合 graphicsLayer.ClearSelection(); //清空图形层所选 } break; case OperateType.Cal_Buff: // 缓冲 IdentifyGraphicsOverlayResult gResult_Buff = await myMapView.IdentifyGraphicsOverlayAsync(graphicsLayer, e.GetPosition(ie), 5, false); if (gResult_Buff.Graphics.Count < 1) { return; } Graphic selGraphic_Buff = gResult_Buff.Graphics.First(); selGraphic_Buff.IsSelected = true; listOfClipGraphics.Add(selGraphic_Buff); //记录所选图形 if (listOfClipGraphics.Count == 1) //图形数目为1时,进行剪切计算 { Graphic g1 = listOfClipGraphics[0]; Esri.ArcGISRuntime.Geometry.Geometry resultGeometry = GeometryEngine.Buffer(g1.Geometry, 1000000.0); //执行剪切操作 if (resultGeometry != null) //处理结果 { graphicsLayer.Graphics.Remove(g1); //从图形层中移除原图形 Graphic clipedGraphic = new Graphic(resultGeometry, new SimpleFillSymbol(SimpleFillSymbolStyle.Solid, Color.FromArgb(125, 255, 250, 0), new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.FromArgb(0, 0, 0), 4.0))); //利 用剪切结果构建新的图形 graphicsLayer.Graphics.Add(clipedGraphic); operation = OperateType.None; } listOfClipGraphics.Clear(); //清空图形选择集合 graphicsLayer.ClearSelection(); //清空图形层所选 } break; case OperateType.Cal_Jiaodian: // 交点 IdentifyGraphicsOverlayResult gResult_Jiaodian = await myMapView.IdentifyGraphicsOverlayAsync(graphicsLayer, e.GetPosition(ie), 5, false); if (gResult_Jiaodian.Graphics.Count < 1) { return; } Graphic selGraphic_Jiaodian = gResult_Jiaodian.Graphics.First(); selGraphic_Jiaodian.IsSelected = true; listOfClipGraphics.Add(selGraphic_Jiaodian); //记录所选图形 if (listOfClipGraphics.Count == 2) //图形数目为1时,进行剪切计算 { Graphic g1 = listOfClipGraphics[0]; Graphic g2 = listOfClipGraphics[1]; IReadOnlyList <Geometry> resultGeometry = GeometryEngine.Intersections(g1.Geometry, g2.Geometry); //执行剪切操作 if (resultGeometry != null) //处理结果 { Graphic clipedGraphic = new Graphic(resultGeometry[0], pointSymbol); //利 用剪切结果构建新的图形 graphicsLayer.Graphics.Add(clipedGraphic); operation = OperateType.None; } listOfClipGraphics.Clear(); //清空图形选择集合 graphicsLayer.ClearSelection(); //清空图形层所选 } break; } }