public override void HandleMouseMove(MouseEventArgs e)
{
base.HandleMouseMove(e);
if (prePoint == default)
{
return;
}
var targetPoints = new List <Point>(points);
var currentPoint = e.GetPosition(Canvas);
currentPoint = AlignPointToXY(currentPoint);
targetPoints.Add(currentPoint);
if (element == null)
{
element = new DrawingLineString(targetPoints, targetPoints.First() == targetPoints.Last());
Canvas.AddVisual(element);
}
else
{
(element as DrawingLineString).Update(targetPoints, targetPoints.First() == targetPoints.Last());
}
element.Render(DrawingCanvas.DefaultPen);
}
public static Geometry ToNTSGeometry(this DrawingLineString drawingLineString)
{
return(new LineString(drawingLineString.Points.Select(p => p.ToCoordinate()).ToArray()));
}
private void ComputeShorestPath()
{
var components = canvas.GetDrawingComponents();
var points = components.OfType <DrawingPoint>().ToList();
if (points.Count < 2)
{
if (paths.Count > 0)
{
paths.ForEach(p => canvas.RemoveVisual(p));
paths.Clear();
}
return;
}
if (points.Count % 2 != 0)
{
points.RemoveAt(points.Count - 1);
}
var pointsCount = points.Count;
if (preVersion == -1 || (preVersion != canvas._version))
{
var geom = GeometryCombiner.Combine(components.Where(c => !c.IsReadOnly && !(c is DrawingPoint)).Select(c => c.ToNTSGeometry()));
finder = new ShortestAvoidancePathFinder(geom);
finder.BufferDistance = finderSettings.BufferDistance;
finder.InternalPointBehavior = (BreakThroughObstaclesBahavior)finderSettings.ObstacleBehavior;
finder.BuildVisualGraph();
preVersion = canvas._version;
}
finder.InternalPointBehavior = (BreakThroughObstaclesBahavior)finderSettings.ObstacleBehavior;
int pathIndex = 0;
for (int i = 0; i < pointsCount; i += 2, pathIndex++)
{
var path = finderSettings.PathCategory == 0 ?
finder.FindShortestPath(points[i].Point.ToCoordinate(), points[i + 1].Point.ToCoordinate())
: finder.FindAlongShortestPath(points[i].Point.ToCoordinate(), points[i + 1].Point.ToCoordinate());
if (path.Count == 0)
{
pathIndex--;
continue;
}
var coos = path.Select(l => l.P0).ToList();
coos.Add(path.Last().P1);
var targetPoints = coos.Select(c => c.ToPoint());
if (pathIndex < paths.Count)
{
paths[pathIndex].Update(targetPoints, false);
paths[pathIndex].Render(DrawingCanvas.HighLightPen);
}
else
{
var drawingLineString = new DrawingLineString(targetPoints, false);
drawingLineString.IsReadOnly = true;
drawingLineString.Render(DrawingCanvas.HighLightPen);
canvas.AddVisual(drawingLineString);
paths.Add(drawingLineString);
}
}
if (pathIndex < paths.Count)
{
for (int i = pathIndex; i < paths.Count; i++)
{
canvas.RemoveVisual(paths[i]);
}
paths.RemoveRange(pathIndex, paths.Count - pathIndex);
}
}
