private async void GenerateGeodesicBuffer_Click(object sender, RoutedEventArgs e)
{
string message = null;
try
{
GraphicsLayer inputGraphicsLayer = null;
var drawShape = (DrawShape)DrawShapes.SelectedItem;
inputGraphicsLayer = drawShape == DrawShape.Point ? mapView1.Map.Layers["PointInputLayer"] as GraphicsLayer :
((drawShape == DrawShape.Polyline) ? mapView1.Map.Layers["LineInputLayer"] as GraphicsLayer : mapView1.Map.Layers["PolygonInputLayer"] as GraphicsLayer);
if (inputGraphicsLayer.Graphics.Count == 0)
{
throw new Exception("No input shape. Please draw shape to generate buffer");
}
Esri.ArcGISRuntime.Geometry.Geometry geom = inputGraphicsLayer.Graphics.FirstOrDefault().Geometry;
if (geom != null)
{
string json = geom.ToJson();
var buffer = GeometryEngine.GeodesicBuffer(geom, 10, LinearUnits.Meters);
if (buffer != null)
{
GraphicsLayer resultGraphicsLayer = mapView1.Map.Layers["GeometryResultGraphicsLayer"] as GraphicsLayer;
resultGraphicsLayer.Graphics.Add(new Graphic()
{
Geometry = buffer
});
mapView1.SetView(resultGraphicsLayer.Graphics.First().Geometry.Extent);
}
}
}
catch (Exception ex)
{
message = ex.Message;
}
if (message != null)
{
await new MessageDialog(message).ShowAsync();
}
}
private async void QueryFeatures(Geometry buffer, MapPoint location)
{
//create query
var query = new QueryParameters();
query.Geometry = buffer;
query.MaxAllowableOffset = 0;
System.Diagnostics.Debug.WriteLine(buffer.ToJson());
var layer = MyMapView.Map.OperationalLayers[0] as FeatureLayer;
var table = layer.FeatureTable;
var results = await table.QueryFeaturesAsync(query);
layer.ClearSelection();
/* // ===================================================================
* // Single Closest Bar
* // -------------------------------------------------------------------
*
* double shortDist = -1;
* Feature feature = null;
*
* //check for closest bars within buffer
* foreach (var item in results)
* {
* var calcDistance = GeometryEngine.Distance(location, item.Geometry);
*
* if (shortDist == -1)
* {
* shortDist = calcDistance;
* feature = item;
* continue;
* }
*
* if (calcDistance < shortDist)
* {
* shortDist = calcDistance;
* feature = item;
* }
* }
*
* //exit if no closest bar
* if (feature == null)
* return;
*
* if (!(GeometryEngine.Intersects(buffer, feature.Geometry)))
* return;
*
* //highlight closest bar
* layer.SelectFeature(feature);
* layer.SelectionColor = Colors.DarkRed;
*
* //draw line to closest bar
* var linePoints = new PolylineBuilder(SpatialReferences.WebMercator);
* linePoints.AddPoint(location);
* linePoints.AddPoint(feature.Geometry as MapPoint);
* var line = linePoints.ToGeometry();
*
* var lineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.DashDotDot, Colors.Maroon, 2);
* var lineGraphic = new Graphic(line, lineSymbol);
* MyOverlay.Graphics.Add(lineGraphic);
*
*
* //create text symbol for distance at midpoint of line
* var x = (line.Extent.XMin + line.Extent.XMax) / 2;
* var y = (line.Extent.YMin + line.Extent.YMax) / 2;
* var textPoint = new MapPoint(x, y);
* var text = String.Format("{0:0.00}", shortDist / 1609.34) + " miles";
* var textSymbol = new TextSymbol(text, Colors.Black, 15, Esri.ArcGISRuntime.Symbology.HorizontalAlignment.Center, Esri.ArcGISRuntime.Symbology.VerticalAlignment.Baseline);
* textSymbol.FontWeight = Esri.ArcGISRuntime.Symbology.FontWeight.Bold;
* //textSymbol.BackgroundColor = Colors.Maroon;
* //textSymbol.Angle = Math.Atan2(line.Extent.YMax - line.Extent.YMin, line.Extent.XMax - line.Extent.XMin) * 180.0 / Math.PI;
* var textGraphic = new Graphic(textPoint, textSymbol);
* MyOverlay.Graphics.Add(textGraphic);
*
* //===================================================================*/
//==================================================================
// Two Closest Bars
//------------------------------------------------------------------
double[] shortDist = { -1, -1 };
Feature[] feature = new Feature[2];
System.Diagnostics.Debug.WriteLine("#1: shortdist is at: " + shortDist[0].ToString() + " " + shortDist[1].ToString());
//check for closest bars within buffer
foreach (var item in results)
{
var calcDistance = GeometryEngine.Distance(location, item.Geometry);
System.Diagnostics.Debug.WriteLine("feature distance: " + (calcDistance / 1609.34).ToString() + " meters; shordist = " + shortDist[0].ToString() + " " + shortDist[1].ToString());
if (shortDist[0] == -1)
{
shortDist[0] = calcDistance;
System.Diagnostics.Debug.WriteLine("setting first");
feature[0] = item;
continue;
}
if (shortDist[1] == -1)
{
System.Diagnostics.Debug.WriteLine("setting second");
shortDist[1] = calcDistance;
feature[1] = item;
continue;
}
if (calcDistance < shortDist[0])
{
System.Diagnostics.Debug.WriteLine("less than first");
shortDist[1] = shortDist[0];
feature[1] = feature[0];
shortDist[0] = calcDistance;
feature[0] = item;
}
else if (calcDistance < shortDist[1])
{
System.Diagnostics.Debug.WriteLine("less than second");
shortDist[1] = calcDistance;
feature[1] = item;
}
}
//exit if no closest bar
if (feature[0] == null || feature[1] == null)
{
return;
}
if (!(GeometryEngine.Intersects(buffer, feature[0].Geometry)))
{
return;
}
//highlight closest bar
for (int i = 0; i < 2; i++)
{
layer.SelectFeature(feature[i]);
layer.SelectionColor = Colors.DarkRed;
//draw line to closest bar
var linePoints = new PolylineBuilder(SpatialReferences.WebMercator);
linePoints.AddPoint(location);
linePoints.AddPoint(feature[i].Geometry as MapPoint);
var line = linePoints.ToGeometry();
var lineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.DashDotDot, Colors.Maroon, 2);
var lineGraphic = new Graphic(line, lineSymbol);
MyOverlay.Graphics.Add(lineGraphic);
//create text symbol for distance at midpoint of line
var x = (line.Extent.XMin + line.Extent.XMax) / 2;
var y = (line.Extent.YMin + line.Extent.YMax) / 2;
var textPoint = new MapPoint(x, y);
var text = String.Format("{0:0.00}", shortDist[i] / 1609.34) + " miles";
var textSymbol = new TextSymbol(text, Colors.Black, 15, Esri.ArcGISRuntime.Symbology.HorizontalAlignment.Center, Esri.ArcGISRuntime.Symbology.VerticalAlignment.Baseline);
textSymbol.FontWeight = Esri.ArcGISRuntime.Symbology.FontWeight.Bold;
//textSymbol.BackgroundColor = Colors.Maroon;
//textSymbol.Angle = Math.Atan2(line.Extent.YMax - line.Extent.YMin, line.Extent.XMax - line.Extent.XMin) * 180.0 / Math.PI;
var textGraphic = new Graphic(textPoint, textSymbol);
MyOverlay.Graphics.Add(textGraphic);
}
}
// 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;
}
}