private void ScaleRotate(Point srcPoint) { if (!PDE_Tools.IsExpanded) { return; } ParcelData parcelData = ParcelGridContainer.DataContext as ParcelData; _moveScale = _oldScale = parcelData.ScaleValue; _moveRotation = _oldRotation = parcelData.RotationValue; _srPoint = ParcelMap.ScreenToMap(srcPoint); _srSnapPoint = null; double spX = _srPoint.X; double spY = _srPoint.Y; // Find _startPoint in list of points. If "close" snap to that point. // Otherwise user can free form scale or rotate parcel lines. double shortestDistance = double.MaxValue; Int32 shortestId = -1; ESRI.ArcGIS.Client.Geometry.MapPoint foundPoint = null; foreach (KeyValuePair <Int32, ESRI.ArcGIS.Client.Geometry.MapPoint> kvp in _calculatedPoints) { double x = kvp.Value.X; double y = kvp.Value.Y; double distance = GeometryUtil.LineLength(spX, spY, x, y); if ((distance < shortestDistance) && (distance < _xmlConfiguation.SnapTolerance)) { shortestDistance = distance; shortestId = kvp.Key; foundPoint = new ESRI.ArcGIS.Client.Geometry.MapPoint(x, y); } } if (BearingDistanceToPoint(shortestId, out _srBearingToPoint, out _srDistanceToPoint, out _srSnapPoint)) { // BearingDistanceToPoint will fail if shortestId == -1 _srSnapPointId = shortestId; if (RotationButton.IsChecked == true) { double radialSearch = _srDistanceToPoint * parcelData.ScaleValue; // We seem to be getting some numerical precision error when rotating... this does not // really matter here; we only need to re-buffer if the changes are > 0.1. // if the user re-rotate with the same rotate point, try to avoid re-caching. if ((_originPoint == null) || (_lastGeometryCP == null) || (Math.Abs(_lastSearchDistance - radialSearch) > 0.1) || !_lastBufferBasedOnCurve || (_lastGeometryCP.X != _originPoint.X) || (_lastGeometryCP.Y != _originPoint.Y)) { ESRI.ArcGIS.Client.Geometry.MapPoint offsetOriginPoint = new ESRI.ArcGIS.Client.Geometry.MapPoint(_originPoint.X - radialSearch, _originPoint.Y); // Create a geometry circle from the anchor/rotating point to the snap point. // We will create create a cache of all these points within the buffer distance // of this circle. ESRI.ArcGIS.Client.Geometry.MapPoint endPoint; ESRI.ArcGIS.Client.Geometry.Polyline circle = GeometryUtil.ConstructArcSegment(offsetOriginPoint, 0.0, 0.001, radialSearch, false, SweepDirection.Counterclockwise, out endPoint); _lastGeometryCP = _originPoint; _lastSearchDistance = radialSearch; _lastBufferBasedOnCurve = true; CacheSnapObjects(circle, radialSearch); } } else if (ScaleButton.IsChecked == true) { double mapDistanceBuffer = _srDistanceToPoint * 1.5 * parcelData.ScaleValue; // if the user re-scales with the same scale point, try to avoid re-caching. if ((_originPoint == null) || (_lastGeometryCP == null) || (_lastSearchDistance < mapDistanceBuffer) || _lastBufferBasedOnCurve || (_lastGeometryCP.X != _originPoint.X) || (_lastGeometryCP.Y != _originPoint.Y)) { // Create a line from the anchor/rotating point to the snap point * 1.5 of the distance. // We will create create a cache of all these points within the buffer distance // of this line. ESRI.ArcGIS.Client.Geometry.MapPoint endPoint; ESRI.ArcGIS.Client.Geometry.Polyline snapLine = GeometryUtil.Line(_originPoint, _srBearingToPoint - parcelData.RotationValue, mapDistanceBuffer, out endPoint); if (snapLine != null) { _lastGeometryCP = _originPoint; _lastSearchDistance = mapDistanceBuffer; _lastBufferBasedOnCurve = false; CacheSnapObjects(snapLine, mapDistanceBuffer); } } } // else no snapping. CalculateAndAddLineGraphics(); // Redraw so we have snap graphic shown } else // BearingDistanceToPoint returns false if id = -1 { _srSnapPointId = -1; } }