//first takes any incorrect (concave, self-intersecting, unclosed etc) manually entered border of cluster and
//trasforms it to intermediate convex hull IH.
//then depending on coordinates of badges in IH builds final convex hull FH (containing badges fuzzily inside IH).
void buildInitialCluster(Polygon drawnBorder)
{
if (drawnBorder.Points.Count <= 1)
{
//cannot build convex hull from 1 point
return;
}
//create corrected input polygon
var convexHull = ConvexHull.FindConvexPolygon(drawnBorder.Points.ToList()).ToList();
//no badges, cluster is not created
var contents = GetBadgeList(convexHull);
if (contents.Count() == 0)
{
return;
}
_offset = new Point(0, 0);
//initial building of cluster always changes contents
for (int i = 0; i < contents.Count(); i++)
{
contents[i].SetBusy();
_onClusterUncluster(GetCluster(), contents[i], true, i == contents.Count() - 1);
}
}
//given list of badges which comprise cluster, we build convex hull and then smooth border
public void PlayBuildSmoothCurve()
{
var BadgesCorners = ShapeUtils.buildBadgeCorners(_endpoint.GetClusterables());
if (BadgesCorners.Count <= 2)
{
//rebuilding cluster after unclustering last badge.
//the cluster will soon be removed (by server event)
return;
}
convexHull.Points = ConvexHull.FindConvexPolygon(BadgesCorners);
var convexPoints = convexHull.Points;
_topLeft = new Point(convexPoints.Min(pt => pt.X), convexPoints.Min(pt => pt.Y));
//build bezier curve
var pathFigure = new PathFigure();
Point[] firstControlPoints = null;
Point[] secondControlPoints = null;
ovp.BezierSpline.GetCurveControlPoints(convexPoints.ToArray(),
out firstControlPoints,
out secondControlPoints);
pathFigure.StartPoint = convexPoints.ElementAt(0);
for (int i = 0; i < convexPoints.Count - 1; i++)
{
pathFigure.Segments.Add(new BezierSegment(firstControlPoints[i],
secondControlPoints[i],
convexPoints.ElementAt(i + 1), true));
}
//closing segment
if (convexPoints.Count == 3)
{
Point[] firstLast = new Point[] { convexPoints[2], convexPoints[0], convexPoints[1] };
ovp.BezierSpline.GetCurveControlPoints(firstLast, out firstControlPoints, out secondControlPoints);
pathFigure.Segments.Add(new BezierSegment(firstControlPoints.First(),
secondControlPoints.First(),
convexPoints.First(), true));
}
else
{
Point[] firstLast = new Point[] { convexPoints[convexPoints.Count - 2],
convexPoints[convexPoints.Count - 1],
convexPoints[0], convexPoints[1] };
ovp.BezierSpline.GetCurveControlPoints(firstLast, out firstControlPoints, out secondControlPoints);
pathFigure.Segments.Add(new BezierSegment(firstControlPoints[1],
secondControlPoints[1],
convexPoints[0], true));
}
var pathGeom = new PathGeometry();
pathGeom.Figures.Add(pathFigure);
bezierBorder.Data = pathGeom;
_offset = new Point(0, 0);
if (_endpoint.GetClusterables().Count() > 0)
{
clusterCreated = true;
if (cleanerTimer != null)
{
cleanerTimer.Stop();
cleanerTimer = null;
}
}
SetBounds();
}
