/// <summary>
/// Sets the coordinates of all the individual lines in the visual.
/// </summary>
/// <param name="args">
/// The <c>DependencyPropertyChangedEventArgs</c> object associated
/// with the property-changed event that resulted in this method
/// being called.
/// </param>
/// <param name="lines">
/// The <c>Point3DCollection</c> to be filled.
/// </param>
/// <remarks>
/// <para>
/// Classes that derive from <c>WireBase</c> override this
/// method to fill the <c>lines</c> collection.
/// It is custmary for implementations of this method to clear
/// the <c>lines</c> collection first before filling it.
/// Each pair of successive members of the <c>lines</c>
/// collection indicate one straight line.
/// </para>
/// </remarks>
protected override void Generate(DependencyPropertyChangedEventArgs args,
Point3DCollection lines)
{
lines.Clear();
if (Data == null)
{
return;
}
Transform3D xform = Data.Transform;
foreach (PathFigure3D fig in Data.Figures)
{
PathFigure3D figFlattened = fig.GetFlattenedPathFigure();
Point3D pointStart = xform.Transform(figFlattened.StartPoint);
foreach (PathSegment3D seg in figFlattened.Segments)
{
PolyLineSegment3D segPoly = seg as PolyLineSegment3D;
for (int i = 0; i < segPoly.Points.Count; i++)
{
lines.Add(pointStart);
Point3D point = xform.Transform(segPoly.Points[i]);
lines.Add(point);
pointStart = point;
}
}
}
}
/// <summary>
///
/// </summary>
/// <param name="progress"></param>
/// <param name="point"></param>
/// <param name="tangent"></param>
public void GetPointAtFractionLength(double progress, out Point3D point, out Vector3D tangent)
{
progress = Math.Max(0, Math.Min(1, progress));
point = new Point3D();
tangent = new Vector3D();
double lengthTotal = 0, length = 0;
foreach (PathFigure3D fig in Figures)
{
PathFigure3D figFlattened = fig.GetFlattenedPathFigure();
Point3D ptStart = figFlattened.StartPoint;
foreach (PathSegment3D seg in figFlattened.Segments)
{
PolyLineSegment3D segPoly = seg as PolyLineSegment3D;
foreach (Point3D pt in segPoly.Points)
{
lengthTotal += (pt - ptStart).Length;
ptStart = pt;
}
}
}
foreach (PathFigure3D fig in Figures)
{
PathFigure3D figFlattened = fig.GetFlattenedPathFigure();
Point3D ptStart = figFlattened.StartPoint;
foreach (PathSegment3D seg in figFlattened.Segments)
{
PolyLineSegment3D segPoly = seg as PolyLineSegment3D;
foreach (Point3D pt in segPoly.Points)
{
tangent = pt - ptStart;
double lengthSeg = tangent.Length;
length += lengthSeg;
if (length / lengthTotal >= progress)
{
double factor1 = ((length / lengthTotal) - progress) / (lengthSeg / lengthTotal);
double factor2 = 1 - factor1;
point = (Point3D)(factor1 * (Vector3D)ptStart +
factor2 * (Vector3D)pt);
return;
}
ptStart = pt;
}
}
}
}
void SegmentsPropertyChanged()
{
PolyLineSegment3D polyseg = figFlattened.Segments[0] as PolyLineSegment3D;
Point3DCollection points = polyseg.Points;
polyseg.Points = null;
points.Clear();
Point3D ptStart = StartPoint;
foreach (PathSegment3D seg in Segments)
{
if (seg is LineSegment3D)
{
LineSegment3D segLine = seg as LineSegment3D;
points.Add(segLine.Point);
ptStart = segLine.Point;
}
else if (seg is PolyLineSegment3D)
{
PolyLineSegment3D segPoly = seg as PolyLineSegment3D;
foreach (Point3D pt in segPoly.Points)
{
points.Add(pt);
ptStart = pt;
}
}
else if (seg is BezierSegment3D)
{
BezierSegment3D segBez = seg as BezierSegment3D;
ConvertBezier(points, ptStart, segBez.Point1, segBez.Point2, segBez.Point3);
ptStart = segBez.Point3;
}
else if (seg is PolyBezierSegment3D)
{
PolyBezierSegment3D segPoly = seg as PolyBezierSegment3D;
for (int i = 0; i < segPoly.Points.Count; i += 3)
{
ConvertBezier(points, ptStart, segPoly.Points[i], segPoly.Points[i + 1], segPoly.Points[i + 2]);
ptStart = segPoly.Points[i + 2];
}
}
}
polyseg.Points = points;
}