/// <summary>
/// Returns the y-coordinate of the center point for automatic routing.
/// </summary>
/// <returns>Returns the y-coordinate of the routing center point.</returns>
public double GetRoutingCenterY(mxCellState state)
{
float f = (state.Style != null) ? mxUtils.GetFloat(state.
Style, mxConstants.STYLE_ROUTING_CENTER_Y) : 0;
return(state.GetCenterY() + f * state.Height);
}
/// <summary>
/// Returns the nearest point in the list of absolute points or the center
/// of the opposite terminal.
/// </summary>
/// <param name="edge">State that represents the edge.</param>
/// <param name="opposite">State that represents the opposite terminal.</param>
/// <param name="source">Boolean indicating if the next point for the source or target
/// should be returned.</param>
public mxPoint GetNextPoint(mxCellState edge, mxCellState opposite, bool source)
{
List <mxPoint> pts = edge.AbsolutePoints;
mxPoint point = null;
if (pts != null && pts.Count >= 2)
{
int count = pts.Count;
int index = (source) ? Math.Min(1, count - 1) : Math.Max(0, count - 2);
point = pts[index];
}
if (point == null && opposite != null)
{
point = new mxPoint(opposite.GetCenterX(), opposite.GetCenterY());
}
return(point);
}
/// <summary>
/// Returns the absolute point on the edge for the given relative
/// geometry as a point. The edge is represented by the given cell state.
/// </summary>
/// <param name="state">Represents the state of the parent edge.</param>
/// <param name="geometry">Represents the relative location.</param>
public mxPoint GetPoint(mxCellState state, mxGeometry geometry)
{
double x = state.GetCenterX();
double y = state.GetCenterY();
if (state.Segments != null && (geometry == null || geometry.Relative))
{
double gx = (geometry != null) ? geometry.X / 2 : 0;
int pointCount = state.AbsolutePoints.Count;
double dist = (gx + 0.5) * state.Length;
double[] segments = state.Segments;
double segment = segments[0];
double length = 0;
int index = 1;
while (dist > length + segment && index < pointCount - 1)
{
length += segment;
segment = segments[index++];
}
double factor = (segment == 0) ? 0 : (dist - length) / segment;
mxPoint p0 = state.AbsolutePoints[index - 1];
mxPoint pe = state.AbsolutePoints[index];
if (p0 != null &&
pe != null)
{
double gy = 0;
double offsetX = 0;
double offsetY = 0;
if (geometry != null)
{
gy = geometry.Y;
mxPoint offset = geometry.Offset;
if (offset != null)
{
offsetX = offset.X;
offsetY = offset.Y;
}
}
double dx = pe.X - p0.X;
double dy = pe.Y - p0.Y;
double nx = (segment == 0) ? 0 : dy / segment;
double ny = (segment == 0) ? 0 : dx / segment;
x = p0.X + dx * factor + (nx * gy + offsetX) * scale;
y = p0.Y + dy * factor - (ny * gy - offsetY) * scale;
}
}
else if (geometry != null)
{
mxPoint offset = geometry.Offset;
if (offset != null)
{
x += offset.X;
y += offset.Y;
}
}
return(new mxPoint(x, y));
}