//void UpdateEdgeLabelPosition(LayerEdge[][] list, int i) {
// IntEdge e;
// int labelNodeIndex;
// if (Engine.GetLabelEdgeAndVirtualNode(list, i, out e, out labelNodeIndex)) {
// UpdateLabel(e, labelNodeIndex, db.Anchors);
// }
//}
internal static void UpdateLabel(Edge e, Anchor anchor){
LineSegment labelSide = null;
if (anchor.LabelToTheRightOfAnchorCenter){
e.Label.Center = new Point(anchor.X + anchor.RightAnchor/2, anchor.Y);
labelSide = new LineSegment(e.LabelBBox.LeftTop, e.LabelBBox.LeftBottom);
}
else if (anchor.LabelToTheLeftOfAnchorCenter){
e.Label.Center = new Point(anchor.X - anchor.LeftAnchor/2, anchor.Y);
labelSide = new LineSegment(e.LabelBBox.RightTop, e.LabelBBox.RightBottom);
}
ICurve segmentInFrontOfLabel = GetSegmentInFrontOfLabel(e.Curve, e.Label.Center.Y);
if (segmentInFrontOfLabel == null)
return;
if (Curve.GetAllIntersections(e.Curve, Curve.PolyFromBox(e.LabelBBox), false).Count == 0){
Point curveClosestPoint;
Point labelSideClosest;
if (FindClosestPoints(out curveClosestPoint, out labelSideClosest, segmentInFrontOfLabel, labelSide)){
//shift the label if needed
ShiftLabel(e, ref curveClosestPoint, ref labelSideClosest);
}
else{
//assume that the distance is reached at the ends of labelSideClosest
double u = segmentInFrontOfLabel.ClosestParameter(labelSide.Start);
double v = segmentInFrontOfLabel.ClosestParameter(labelSide.End);
if ((segmentInFrontOfLabel[u] - labelSide.Start).Length <
(segmentInFrontOfLabel[v] - labelSide.End).Length){
curveClosestPoint = segmentInFrontOfLabel[u];
labelSideClosest = labelSide.Start;
}
else{
curveClosestPoint = segmentInFrontOfLabel[v];
labelSideClosest = labelSide.End;
}
ShiftLabel(e, ref curveClosestPoint, ref labelSideClosest);
}
}
}
static void ExtendPolylineStartToClusterBoundary(Polyline poly, ICurve curve)
{
var par = curve.ClosestParameter(poly.Start);
poly.PrependPoint(curve[par]);
}
static void ExtendPolylineEndToClusterBoundary(Polyline poly, ICurve curve)
{
var par = curve.ClosestParameter(poly.End);
poly.AddPoint(curve[par]);
}
static void ExtendPolylineStartToClusterBoundary(Polyline poly, ICurve curve) {
var par = curve.ClosestParameter(poly.Start);
poly.PrependPoint(curve[par]);
}
static void ExtendPolylineEndToClusterBoundary(Polyline poly, ICurve curve) {
var par = curve.ClosestParameter(poly.End);
poly.AddPoint(curve[par]);
}
/// <summary>
/// gets the point on the curve that is closest to the given point
/// </summary>
/// <param name="curve">the curve to examine</param>
/// <param name="location">the target point</param>
/// <returns>the closest point</returns>
public static Point ClosestPoint(ICurve curve, Point location) {
ValidateArg.IsNotNull(curve, "curve");
return curve[curve.ClosestParameter(location)];
}
public static double ClosestParameterWithPoint(ICurve curve, Point location, out Point pointOnCurve) {
ValidateArg.IsNotNull(curve, "curve");
double t = curve.ClosestParameter(location);
pointOnCurve = curve[t];
return t;
}