/// <summary>
/// Obtains line sections for a specific face in this path.
/// </summary>
/// <param name="face">The face of interest</param>
/// <returns>The corresponding sections</returns>
internal ILineGeometry[] GetSections(LegFace face)
{
EnsureAdjusted();
// Initialize position to the start of the path.
IPosition p = new Position(m_From);
// Initial bearing is whatever the rotation is.
double bearing = m_Rotation;
// Get the position at the start of the required leg.
foreach (Leg leg in m_Legs)
{
if (leg == face.Leg)
{
break;
}
leg.Project(ref p, ref bearing, m_ScaleFactor);
}
// We've now got the position at the start of the required leg, and the bearing of the previous leg.
// If the leg we actually want if a straight leg (or an extra leg layered on a straight), add on any
// initial angle.
StraightLeg sLeg = (face.Leg as StraightLeg);
if (sLeg != null)
{
bearing = sLeg.AddStartAngle(bearing);
}
return(face.Leg.GetSpanSections(p, bearing, m_ScaleFactor, face.Spans));
}
/// <summary>
/// Draws the path on the specified display
/// </summary>
/// <param name="display">The display to draw to</param>
internal void Render(ISpatialDisplay display)
{
EnsureAdjusted();
// Do nothing if the scale factor is undefined.
if (Math.Abs(m_ScaleFactor) < MathConstants.TINY)
{
return;
}
// Initialize position to the start of the path.
IPosition gotend = new Position(m_From);
// Initial bearing is whatever the rotation is.
double bearing = m_Rotation;
for (int i = 0; i < m_Legs.Length; i++)
{
Leg leg = m_Legs[i];
// Include any angle specified at the start of the leg
StraightLeg sLeg = (leg as StraightLeg);
if (sLeg != null)
{
bearing = sLeg.AddStartAngle(bearing);
}
// Determine exit bearing for circular leg (do it now, in case an extra leg complicates matters below)
double exitBearing = bearing;
CircularLeg cLeg = (leg as CircularLeg);
if (cLeg != null)
{
exitBearing = cLeg.GetExitBearing(gotend, bearing, m_ScaleFactor);
}
// Obtain geometry for each span and draw
SpanInfo[] spans = leg.PrimaryFace.Spans;
ILineGeometry[] sections = leg.GetSpanSections(gotend, bearing, m_ScaleFactor, spans);
DrawSpans(display, spans, sections);
// If we're dealing with the first face of a staggered leg, process the second face
if (leg.AlternateFace != null)
{
spans = leg.AlternateFace.Spans;
sections = leg.GetSpanSections(gotend, bearing, m_ScaleFactor, spans);
DrawSpans(display, spans, sections);
}
// Get to the end of the leg
gotend = sections[sections.Length - 1].End;
bearing = exitBearing;
}
// Re-draw the terminal points to ensure that their color is on top.
DrawEnds(display);
}
