private void CutBuilding(MapViewMouseButtonEventArgs e)
{
QueuedTask.Run(() =>
{
Dictionary <MapMember, List <long> > selectedItems = GetSelectedItems(e);
EditOperation editOperation = new EditOperation();
foreach (KeyValuePair <MapMember, List <long> > item in selectedItems)
{
BasicFeatureLayer layer = item.Key as BasicFeatureLayer;
if (layer.ShapeType != ArcGIS.Core.CIM.esriGeometryType.esriGeometryPolygon)
{
continue;
}
foreach (long oid in item.Value)
{
var feature = layer.Inspect(oid);
Geometry geometry = feature.Shape.Clone();
Polyline polyLine = GetCutPolyLine(geometry);
var splitItems = GeometryEngine.Cut(geometry, polyLine);
feature.Shape = splitItems.First();
editOperation.Modify(feature);
Layer pointLayer = MapView.Active.Map.Layers[0];
editOperation.Create(pointLayer, geometry.Extent.Center);
}
editOperation.Execute();
}
MapView.Active.Map.SetSelection(null);
});
}
// Cuts feature geometries with a user defined cut polyline.
private async void CutButton_Click(object sender, RoutedEventArgs e)
{
try
{
resultGraphics.Graphics.Clear();
// wait for user to draw cut line
var cutLine = await mapView.Editor.RequestShapeAsync(DrawShape.Polyline, _cutLineSymbol) as Polyline;
// get intersecting features from the feature layer
SpatialQueryFilter filter = new SpatialQueryFilter();
filter.Geometry = GeometryEngine.Project(cutLine, _statesLayer.FeatureTable.SpatialReference);
filter.SpatialRelationship = SpatialRelationship.Crosses;
filter.MaximumRows = 52;
var stateFeatures = await _statesLayer.FeatureTable.QueryAsync(filter);
// Cut the feature geometries and add to graphics layer
var states = stateFeatures.Select(feature => feature.Geometry);
var cutGraphics = states
.Where(geo => !GeometryEngine.Within(cutLine, geo))
.SelectMany(state => GeometryEngine.Cut(state, cutLine))
.Select(geo => new Graphic(geo, _cutFillSymbol));
resultGraphics.Graphics.AddRange(cutGraphics);
}
catch (TaskCanceledException)
{
}
catch (Exception ex)
{
MessageBox.Show("Cut Error: " + ex.Message, "Cut Geometry");
}
}
private async Task DoCutPolygons()
{
if (statesOverlay != null && resultsOverlay != null)
{
resultsOverlay.Graphics.Clear();
// Get the user's input
var cutPolyLine = (await mapView1.Editor.RequestShapeAsync(DrawShape.Polyline)) as Polyline;
// Normalize for WrapAround
Polyline polyline = GeometryEngine.NormalizeCentralMeridian(cutPolyLine) as Polyline;
// Iterate over the graphics in the GraphicsOverlay. If the graphic intersects with the polyline we will cut it
// and create Graphic objects from the results. Next we add those Graphics resulting to a List<Graphic>.
List <Graphic> cutGraphics = new List <Graphic>();
foreach (var g in statesOverlay.Graphics)
{
if (GeometryEngine.Intersects(g.Geometry, polyline))
{
var cutPolygonGeometries = GeometryEngine.Cut(g.Geometry, polyline);
var cutPolygonGraphics = cutPolygonGeometries.Select(x => new Graphic {
Geometry = x
});
cutGraphics.AddRange(cutPolygonGraphics);
}
}
// Add the results to the GraphicsOverlay
resultsOverlay.Graphics.AddRange(cutGraphics);
}
}
private async Task DoCutPolygons()
{
SetupUI();
if (graphicsLayer != null)
{
//Get the user's input
var cutPolyLine = (await mapView1.Editor.RequestShapeAsync(DrawShape.Polyline)) as Polyline;
//iterate over the graphics in the graphicsLayer. If the graphic intersects with the polyline we will cut it.
//and then create Graphic objects from the results. Next we add those Graphics resulting to a new list (finalList).
//if it doesn't we will add the graphic to the new list (finalList)
var finalList = graphicsLayer.Graphics.ToList();
foreach (var g in graphicsLayer.Graphics)
{
if (GeometryEngine.Intersects(g.Geometry, cutPolyLine))
{
var cutPolygonGeometries = GeometryEngine.Cut(g.Geometry, cutPolyLine);
var cutPolygonGraphics = cutPolygonGeometries.Select(x => new Graphic {
Geometry = x
});
finalList.AddRange(cutPolygonGraphics);
}
else
{
finalList.Add(g);
}
}
//add the results to the graphics layer
graphicsLayer.Graphics.Clear();
graphicsLayer.Graphics.AddRange(finalList);
}
}
private void CutButton_Click(object sender, EventArgs e)
{
try
{
// Cut the polygon geometry with the polyline, expect two geometries.
Geometry[] cutGeometries = GeometryEngine.Cut(_lakeSuperiorPolygonGraphic.Geometry, (Polyline)_countryBorderPolylineGraphic.Geometry);
// Create a simple line symbol for the outline of the Canada side of Lake Superior.
SimpleLineSymbol canadaSideSimpleLineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Null, System.Drawing.Color.Blue, 0);
// Create the simple fill symbol for the Canada side of Lake Superior graphic - comprised of a fill style, fill color and outline.
SimpleFillSymbol canadaSideSimpleFillSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.ForwardDiagonal, System.Drawing.Color.Green, canadaSideSimpleLineSymbol);
// Create the graphic for the Canada side of Lake Superior - comprised of a polygon shape and fill symbol.
Graphic canadaSideGraphic = new Graphic(cutGeometries[0], canadaSideSimpleFillSymbol);
// Add the Canada side of the Lake Superior graphic to the graphics overlay collection.
_graphicsOverlay.Graphics.Add(canadaSideGraphic);
// Create a simple line symbol for the outline of the USA side of Lake Superior.
SimpleLineSymbol usaSideSimpleLineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Null, System.Drawing.Color.Blue, 0);
// Create the simple fill symbol for the USA side of Lake Superior graphic - comprised of a fill style, fill color and outline.
SimpleFillSymbol usaSideSimpleFillSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.ForwardDiagonal, System.Drawing.Color.Yellow, usaSideSimpleLineSymbol);
// Create the graphic for the USA side of Lake Superior - comprised of a polygon shape and fill symbol.
Graphic usaSideGraphic = new Graphic(cutGeometries[1], usaSideSimpleFillSymbol);
// Add the USA side of the Lake Superior graphic to the graphics overlay collection.
_graphicsOverlay.Graphics.Add(usaSideGraphic);
// Disable the button after has been used.
_cutButton.Enabled = false;
}
catch (System.Exception ex)
{
// Display an error message if there is a problem generating cut operation.
AlertDialog.Builder alertBuilder = new AlertDialog.Builder(this);
alertBuilder.SetTitle("There was a problem cutting the geometry.");
alertBuilder.SetMessage(ex.ToString());
alertBuilder.Show();
}
}
private void CutButton_TouchUpInside(object sender, EventArgs e)
{
try
{
// Cut the polygon geometry with the polyline, expect two geometries.
Geometry[] cutGeometries = GeometryEngine.Cut(_lakeSuperiorPolygonGraphic.Geometry, (Polyline)_countryBorderPolylineGraphic.Geometry);
// Create a simple line symbol for the outline of the Canada side of Lake Superior.
SimpleLineSymbol canadaSideSimpleLineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Null, System.Drawing.Color.Blue, 0);
// Create the simple fill symbol for the Canada side of Lake Superior graphic - comprised of a fill style, fill color and outline.
SimpleFillSymbol canadaSideSimpleFillSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.ForwardDiagonal, System.Drawing.Color.Green, canadaSideSimpleLineSymbol);
// Create the graphic for the Canada side of Lake Superior - comprised of a polygon shape and fill symbol.
Graphic canadaSideGraphic = new Graphic(cutGeometries[0], canadaSideSimpleFillSymbol);
// Add the Canada side of the Lake Superior graphic to the graphics overlay collection.
_graphicsOverlay.Graphics.Add(canadaSideGraphic);
// Create a simple line symbol for the outline of the USA side of Lake Superior.
SimpleLineSymbol usaSideSimpleLineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Null, System.Drawing.Color.Blue, 0);
// Create the simple fill symbol for the USA side of Lake Superior graphic - comprised of a fill style, fill color and outline.
SimpleFillSymbol usaSideSimpleFillSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.ForwardDiagonal, System.Drawing.Color.Yellow, usaSideSimpleLineSymbol);
// Create the graphic for the USA side of Lake Superior - comprised of a polygon shape and fill symbol.
Graphic usaSideGraphic = new Graphic(cutGeometries[1], usaSideSimpleFillSymbol);
// Add the USA side of the Lake Superior graphic to the graphics overlay collection.
_graphicsOverlay.Graphics.Add(usaSideGraphic);
// Disable the button after has been used.
_cutButton.Enabled = false;
}
catch (System.Exception ex)
{
// Display an error message if there is a problem generating cut 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;
}
}
private async void CutButton_Click(object sender, RoutedEventArgs e)
{
try
{
// Cut the polygon geometry with the polyline, expect two geometries.
Geometry[] cutGeometries = GeometryEngine.Cut(_lakeSuperiorPolygonGraphic.Geometry, (Polyline)_countryBorderPolylineGraphic.Geometry);
// Create a simple line symbol for the outline of the Canada side of Lake Superior.
SimpleLineSymbol canadaSideSimpleLineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Null, Windows.UI.Colors.Blue, 0);
// Create the simple fill symbol for the Canada side of Lake Superior graphic - comprised of a fill style, fill color and outline.
SimpleFillSymbol canadaSideSimpleFillSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.ForwardDiagonal, Windows.UI.Colors.Green, canadaSideSimpleLineSymbol);
// Create the graphic for the Canada side of Lake Superior - comprised of a polygon shape and fill symbol.
Graphic canadaSideGraphic = new Graphic(cutGeometries[0], canadaSideSimpleFillSymbol);
// Add the Canada side of the Lake Superior graphic to the graphics overlay collection.
_graphicsOverlay.Graphics.Add(canadaSideGraphic);
// Create a simple line symbol for the outline of the USA side of Lake Superior.
SimpleLineSymbol usaSideSimpleLineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Null, Windows.UI.Colors.Blue, 0);
// Create the simple fill symbol for the USA side of Lake Superior graphic - comprised of a fill style, fill color and outline.
SimpleFillSymbol usaSideSimpleFillSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.ForwardDiagonal, Windows.UI.Colors.Yellow, usaSideSimpleLineSymbol);
// Create the graphic for the USA side of Lake Superior - comprised of a polygon shape and fill symbol.
Graphic usaSideGraphic = new Graphic(cutGeometries[1], usaSideSimpleFillSymbol);
// Add the USA side of the Lake Superior graphic to the graphics overlay collection.
_graphicsOverlay.Graphics.Add(usaSideGraphic);
// Disable the button after has been used.
CutButton.IsEnabled = false;
}
catch (System.Exception ex)
{
// Display an error message if there is a problem generating cut operation.
MessageDialog theMessageDialog = new MessageDialog("Geometry Engine Failed: " + ex.Message);
await theMessageDialog.ShowAsync();
}
}
private void CutButton_Clicked(object sender, EventArgs e)
{
try
{
// Cut the polygon geometry with the polyline, expect two geometries.
Geometry[] cutGeometries = GeometryEngine.Cut(_lakeSuperiorPolygonGraphic.Geometry, (Polyline)_countryBorderPolylineGraphic.Geometry);
// Create a simple line symbol for the outline of the Canada side of Lake Superior.
SimpleLineSymbol canadaSideSimpleLineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Null, Color.Blue, 0);
// Create the simple fill symbol for the Canada side of Lake Superior graphic - comprised of a fill style, fill color and outline.
SimpleFillSymbol canadaSideSimpleFillSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.ForwardDiagonal, Color.Green, canadaSideSimpleLineSymbol);
// Create the graphic for the Canada side of Lake Superior - comprised of a polygon shape and fill symbol.
Graphic canadaSideGraphic = new Graphic(cutGeometries[0], canadaSideSimpleFillSymbol);
// Add the Canada side of the Lake Superior graphic to the graphics overlay collection.
_graphicsOverlay.Graphics.Add(canadaSideGraphic);
// Create a simple line symbol for the outline of the USA side of Lake Superior.
SimpleLineSymbol usaSideSimpleLineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Null, Color.Blue, 0);
// Create the simple fill symbol for the USA side of Lake Superior graphic - comprised of a fill style, fill color and outline.
SimpleFillSymbol usaSideSimpleFillSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.ForwardDiagonal, Color.Yellow, usaSideSimpleLineSymbol);
// Create the graphic for the USA side of Lake Superior - comprised of a polygon shape and fill symbol.
Graphic usaSideGraphic = new Graphic(cutGeometries[1], usaSideSimpleFillSymbol);
// Add the USA side of the Lake Superior graphic to the graphics overlay collection.
_graphicsOverlay.Graphics.Add(usaSideGraphic);
// Disable the button after has been used.
CutButton.IsEnabled = false;
}
catch (Exception ex)
{
// Display an error message if there is a problem generating cut operation.
Application.Current.MainPage.DisplayAlert("Geometry Engine Failed", "Error performing cut: " + ex.Message, "OK");
}
}
// 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;
}
}