public void AddGeometry(
Action <PointD3D, VectorD3D> AddPositionAndNormal,
Action <int, int, int, bool> AddIndices,
ref int vertexIndexOffset,
PenX3D pen,
LineD3D line
)
{
var westnorth = PolylineMath3D.GetWestNorthVectors(line);
var westVector = westnorth.Item1;
var northVector = westnorth.Item2;
if (pen.DashPattern is DashPatterns.Solid)
{
// draw without a dash pattern - we consider the whole line as one dash segment, but instead of dash caps, with line caps
_dashSegment.Initialize(pen.CrossSection, pen.Thickness1, pen.Thickness2, pen.LineStartCap, pen.LineEndCap, westVector, northVector, line);
_dashSegment.AddGeometry(AddPositionAndNormal, AddIndices, ref vertexIndexOffset, line, null, null);
}
else
{
// draw with a dash pattern
_dashSegment.Initialize(pen, westVector, northVector, line);
double dashOffset = 0;
PointD3D lineStart = line.P0;
PointD3D lineEnd = line.P1;
var lineVector = line.LineVector;
double lineLength = lineVector.Length;
var lineVectorNormalized = lineVector / lineLength;
// calculate the real start and end of the line, taking the line start and end cap length into account
if (null != pen.LineStartCap)
{
var v = pen.LineStartCap.GetAbsoluteBaseInset(pen.Thickness1, pen.Thickness2);
if (v < 0)
{
dashOffset = -v;
lineStart += -v * lineVectorNormalized;
lineLength += v;
}
}
if (null != pen.LineEndCap)
{
var v = pen.LineEndCap.GetAbsoluteBaseInset(pen.Thickness1, pen.Thickness2);
if (v < 0)
{
lineEnd += v * lineVectorNormalized;
lineLength += v;
}
}
// now draw the individual dash segments
bool wasLineStartCapDrawn = false;
bool wasLineEndCapDrawn = false;
if (lineLength > 0)
{
foreach (var seg in Math3D.DissectStraightLineWithDashPattern(new LineD3D(lineStart, lineEnd), pen.DashPattern, pen.DashPattern.DashOffset, Math.Max(pen.Thickness1, pen.Thickness2), dashOffset))
{
if (seg.P0 == lineStart) // this is the start of the line, thus we must use the lineStartCap instead of the dashStartCap
{
_dashSegment.AddGeometry(AddPositionAndNormal, AddIndices, ref vertexIndexOffset, seg, pen.LineStartCap, null);
wasLineStartCapDrawn = true;
}
else if (seg.P1 == lineEnd) // this is the end of the line, thus we must use the lineEndCap instead of the dashEndCap
{
_dashSegment.AddGeometry(AddPositionAndNormal, AddIndices, ref vertexIndexOffset, seg, null, pen.LineEndCap);
wasLineEndCapDrawn = true;
}
else // this is a normal dashSegment, thus we can use dashStartCap and dashEndCap
{
_dashSegment.AddGeometry(AddPositionAndNormal, AddIndices, ref vertexIndexOffset, seg, null, null);
}
}
}
object temporaryStorageSpace = null;
// if the start cap was not drawn before, it must be drawn now
if (!wasLineStartCapDrawn && null != pen.LineStartCap)
{
pen.LineStartCap.AddGeometry(
AddPositionAndNormal,
AddIndices,
ref vertexIndexOffset,
true,
lineStart,
westVector,
northVector,
lineVectorNormalized,
pen.CrossSection,
null,
null,
ref temporaryStorageSpace);
}
// if the end cap was not drawn before, it must be drawn now
if (!wasLineEndCapDrawn && null != pen.LineEndCap)
{
pen.LineEndCap.AddGeometry(
AddPositionAndNormal,
AddIndices,
ref vertexIndexOffset,
false,
lineEnd,
westVector,
northVector,
lineVectorNormalized,
pen.CrossSection,
null,
null,
ref temporaryStorageSpace);
}
}
}