/// <inheritdoc />
public void AddGeometry(
Action <PointD3D, VectorD3D> AddPositionAndNormal,
Action <int, int, int, bool> AddIndices,
ref int vertexIndexOffset,
bool isStartCap,
PointD3D basePoint,
VectorD3D eastVector,
VectorD3D northVector,
VectorD3D forwardVectorNormalized,
ICrossSectionOfLine lineCrossSection,
PointD3D[] baseCrossSectionPositions,
VectorD3D[] baseCrossSectionNormals,
ref object temporaryStorageSpace)
{
var crossSectionVertexCount = lineCrossSection.NumberOfVertices;
var crossSectionNormalCount = lineCrossSection.NumberOfNormals;
var capCrossSectionPositions = baseCrossSectionPositions ?? (PointD3D[])temporaryStorageSpace ?? (PointD3D[])(temporaryStorageSpace = new PointD3D[crossSectionVertexCount]);
if (null == baseCrossSectionPositions) // if null the positions were not provided
{
var matrix = Math3D.Get2DProjectionToPlane(eastVector, northVector, basePoint);
for (int i = 0, j = 0; i < crossSectionVertexCount; ++i, ++j)
{
capCrossSectionPositions[i] = matrix.Transform(lineCrossSection.Vertices(i));
}
}
AddGeometry(AddPositionAndNormal, AddIndices, ref vertexIndexOffset, isStartCap, basePoint, forwardVectorNormalized, capCrossSectionPositions);
}
/// <summary>
/// Gets the vertices of a cross section from a certain vertex index to another vertex index (including the last vertex index).
/// </summary>
/// <param name="crossSection">The cross section.</param>
/// <param name="firstVertexIndex">The first vertex index to include. Must be greater than or equal to zero.</param>
/// <param name="lastIncludedVertexIndex">The last vertex index to include. Must be greater than <paramref name="firstVertexIndex"/>, but can be greater than the number of vertices of the cross section in order to describe a polygon that 'wraps around'.</param>
/// <returns>The vertices from the first index up to and including the last index.</returns>
/// <exception cref="ArgumentOutOfRangeException"></exception>
/// <exception cref="ArgumentException"></exception>
public static IEnumerable <PointD2D> GetVerticesFromToIncluding(ICrossSectionOfLine crossSection, int firstVertexIndex, int lastIncludedVertexIndex)
{
if (!(firstVertexIndex <= lastIncludedVertexIndex))
{
throw new ArgumentOutOfRangeException(nameof(lastIncludedVertexIndex) + " must be greater then or equal to " + nameof(firstVertexIndex));
}
if (!(firstVertexIndex >= 0))
{
throw new ArgumentException(nameof(firstVertexIndex) + "must be >=0");
}
int vertexCount = crossSection.NumberOfVertices;
for (int i = firstVertexIndex; i <= lastIncludedVertexIndex; ++i)
{
yield return(crossSection.Vertices(i % vertexCount));
}
}
/// <summary>
/// Adds the triangle geometry for this cap.
/// </summary>
/// <param name="AddPositionAndNormal">The procedure to add a vertex position and normal.</param>
/// <param name="AddIndices">The procedure to add vertex indices for one triangle.</param>
/// <param name="vertexIndexOffset">The vertex index offset. Must be actualized during this call.</param>
/// <param name="isStartCap">If set to <c>true</c>, a start cap is drawn; otherwise, an end cap is drawn.</param>
/// <param name="basePoint">The location of the middle point of the line at the cap's location.</param>
/// <param name="westVector">The west vector for orientation of the cross section.</param>
/// <param name="northVector">The north vector for orientation of the cross section.</param>
/// <param name="forwardVector">The forward vector for orientation of the cross section.</param>
/// <param name="crossSection">The cross section of the line.</param>
public static void AddGeometry(
Action <PointD3D, VectorD3D> AddPositionAndNormal,
Action <int, int, int, bool> AddIndices,
ref int vertexIndexOffset,
bool isStartCap,
PointD3D basePoint,
VectorD3D westVector,
VectorD3D northVector,
VectorD3D forwardVector,
ICrossSectionOfLine crossSection
)
{
if (isStartCap)
{
forwardVector = -forwardVector;
}
var matrix = Matrix4x3.NewFromBasisVectorsAndLocation(westVector, northVector, forwardVector, basePoint);
int currIndex = vertexIndexOffset;
int crossSectionPositionCount = crossSection.NumberOfVertices;
// Add the midpoint
// add the middle point of the end cap and the normal of the end cap
AddPositionAndNormal(basePoint, forwardVector);
++currIndex;
for (int i = 0; i < crossSectionPositionCount; ++i)
{
var sp = matrix.Transform(crossSection.Vertices(i));
AddPositionAndNormal(sp, forwardVector);
AddIndices(
currIndex - 1, // mid point of the end cap
currIndex + i,
currIndex + (1 + i) % crossSectionPositionCount,
isStartCap);
}
currIndex += crossSectionPositionCount;
vertexIndexOffset = currIndex;
}
public static void Add(
Action <PointD3D, VectorD3D> AddPositionAndNormal,
Action <int, int, int, bool> AddIndices,
ref int vertexIndexOffset,
bool isStartCap,
PointD3D basePoint,
VectorD3D westVector,
VectorD3D northVector,
VectorD3D forwardVectorNormalized,
ICrossSectionOfLine lineCrossSection,
PointD3D[] crossSectionPositions,
VectorD3D[] crossSectionNormals,
ref object temporaryStorageSpace,
ILineCapContour capContour
)
{
var crossSectionVertexCount = lineCrossSection.NumberOfVertices;
var crossSectionNormalCount = lineCrossSection.NumberOfNormals;
var contourZScale = 0.5 * Math.Max(lineCrossSection.Size1, lineCrossSection.Size2);
// do we need a flat end at the beginning of the cap?
if (null == crossSectionPositions && // if lineCrossSectionPositions are null, it means that our cap is not connected to the line and needs a flat end
capContour.Vertices(0) == _pointD2D_0_1) // furthermore the cap assumes to be started at the cross section
{
// the parameter isStartCap must be negated, because this flat cap is the "counterpart" of our cap to draw
Flat.AddGeometry(
AddPositionAndNormal,
AddIndices,
ref vertexIndexOffset,
!isStartCap,
basePoint,
westVector,
northVector,
forwardVectorNormalized,
lineCrossSection);
}
if (isStartCap)
{
forwardVectorNormalized = -forwardVectorNormalized;
}
var contourVertexCount = capContour.NumberOfVertices;
var contourNormalCount = capContour.NumberOfNormals;
// now the calculation can start
CrossSectionCases previousCrossSectionType = CrossSectionCases.MiddlePointSmooth;
int previousGeneratedPoints = 0;
int previousContourVertexIndex = 0;
bool isOnSecondSideOfContourVertexSharp = true;
for (int contourVertexIndex = 0, contourNormalIndex = 0; contourVertexIndex < contourVertexCount; ++contourVertexIndex, ++contourNormalIndex)
{
// we have 4 different situations here:
// 1st) the crossSection.Y is zero, thus this is the middle point (the normal should then go in z-direction) -> we need only one single vertex and normal for that
// 2nd) the countour normal is in x-direction -> we need only a point for each crossSection vertex, but not for each crossSectionNormal
// 3rd) the regular case -> we need a point for each crossSection normal
var capContourVertex = capContour.Vertices(contourVertexIndex);
var capContourNormal = capContour.Normals(contourNormalIndex);
CrossSectionCases currentCrossSectionType;
if (capContourVertex.Y == 0 && capContourNormal.Y == 0)
{
currentCrossSectionType = CrossSectionCases.MiddlePointSmooth;
}
else if (capContourVertex.Y == 0)
{
currentCrossSectionType = CrossSectionCases.MiddlePointSharp;
}
else if (0 == capContourNormal.Y)
{
currentCrossSectionType = CrossSectionCases.VerticesOnly;
}
else
{
currentCrossSectionType = CrossSectionCases.Regular;
}
var currentLocation = basePoint + forwardVectorNormalized * capContourVertex.X * contourZScale;
var matrix = Matrix4x3.NewFromBasisVectorsAndLocation(westVector, northVector, forwardVectorNormalized, currentLocation);
int currentGeneratedPoints = 0;
switch (currentCrossSectionType)
{
case CrossSectionCases.MiddlePointSmooth:
{
var position = matrix.Transform(PointD2D.Empty);
var normal = matrix.Transform(new VectorD3D(0, 0, capContourNormal.X));
AddPositionAndNormal(position, normal);
currentGeneratedPoints = 1;
}
break;
case CrossSectionCases.MiddlePointSharp:
{
for (int i = 0, j = 0; i < crossSectionVertexCount; ++i, ++j)
{
var normal1 = (i == 0) ? lineCrossSection.Normals(crossSectionNormalCount - 1) : lineCrossSection.Normals(j - 1);
var normal2 = lineCrossSection.Normals(j);
var sn = (normal1 + normal2).Normalized;
var utNormal = GetNormalVector(lineCrossSection.Vertices(i), sn, capContourNormal, contourZScale);
AddPositionAndNormal(currentLocation, matrix.Transform(utNormal)); // store the tip point with the averaged normal
if (lineCrossSection.IsVertexSharp(i))
{
++j;
}
}
currentGeneratedPoints = crossSectionVertexCount;
}
break;
case CrossSectionCases.VerticesOnly:
{
var commonNormal = matrix.Transform(new VectorD3D(0, 0, capContourNormal.X));
for (int i = 0; i < crossSectionVertexCount; ++i)
{
var position = matrix.Transform(lineCrossSection.Vertices(i) * capContourVertex.Y);
AddPositionAndNormal(position, commonNormal);
}
currentGeneratedPoints = crossSectionVertexCount;
}
break;
case CrossSectionCases.Regular:
{
for (int i = 0, j = 0; i < crossSectionVertexCount; ++i, ++j)
{
var sp = lineCrossSection.Vertices(i);
var sn = lineCrossSection.Normals(j);
var utNormal = GetNormalVector(sp, sn, capContourNormal, contourZScale);
var position = matrix.Transform(sp * capContourVertex.Y);
var normal = matrix.Transform(utNormal);
AddPositionAndNormal(position, normal);
if (lineCrossSection.IsVertexSharp(i))
{
++j;
sn = lineCrossSection.Normals(j);
utNormal = GetNormalVector(sp, sn, capContourNormal, contourZScale);
normal = matrix.Transform(utNormal);
AddPositionAndNormal(position, normal);
}
}
currentGeneratedPoints = crossSectionNormalCount;
}
break;
default:
throw new NotImplementedException();
}
vertexIndexOffset += currentGeneratedPoints;
// now we start generating triangles
if (contourVertexIndex > previousContourVertexIndex)
{
int voffset1 = vertexIndexOffset - currentGeneratedPoints;
int voffset0 = voffset1 - previousGeneratedPoints;
switch (previousCrossSectionType)
{
case CrossSectionCases.MiddlePointSmooth:
{
switch (currentCrossSectionType)
{
case CrossSectionCases.MiddlePointSmooth: // Middle point to middle point
{
// no triangles, since from middle point to middle point we have an infinity thin line
}
break;
case CrossSectionCases.MiddlePointSharp: // Middle point to middle point
{
// no triangles, since from middle point to middle point we have an infinity thin line
}
break;
case CrossSectionCases.VerticesOnly: // Middle point to vertices only
{
for (int i = 0; i < crossSectionVertexCount; ++i)
{
AddIndices(voffset0, voffset1 + i, voffset1 + (i + 1) % crossSectionVertexCount, isStartCap);
}
}
break;
case CrossSectionCases.Regular: // Middle point to regular
{
for (int i = 0; i < crossSectionNormalCount; ++i)
{
AddIndices(voffset0, voffset1 + i, voffset1 + (i + 1) % crossSectionNormalCount, isStartCap);
}
}
break;
default:
throw new NotImplementedException();
}
}
break;
case CrossSectionCases.MiddlePointSharp:
{
switch (currentCrossSectionType)
{
case CrossSectionCases.MiddlePointSmooth: // Middle point to middle point
{
// no triangles, since from middle point to middle point we have an infinity thin line
}
break;
case CrossSectionCases.MiddlePointSharp: // Middle point to middle point
{
// no triangles, since from middle point to middle point we have an infinity thin line
}
break;
case CrossSectionCases.VerticesOnly: // MiddlePointSharp to VerticesOnly
{
for (int i = 0; i < crossSectionVertexCount; ++i)
{
AddIndices(voffset0, voffset1 + i, voffset1 + (i + 1) % crossSectionVertexCount, isStartCap);
}
}
break;
case CrossSectionCases.Regular: // MiddlePointSharp to Regular
{
for (int i = 0, j = 0; i < crossSectionNormalCount; ++i, ++j)
{
AddIndices(voffset0 + i, voffset1 + i, voffset1 + (i + 1) % crossSectionNormalCount, isStartCap);
}
}
break;
default:
throw new NotImplementedException();
}
}
break;
case CrossSectionCases.VerticesOnly:
{
switch (currentCrossSectionType)
{
case CrossSectionCases.MiddlePointSmooth: // VerticesOnly to MiddlePoint
{
for (int i = 0; i < crossSectionVertexCount; ++i)
{
AddIndices(voffset1, voffset0 + i, voffset0 + (i + 1) % crossSectionVertexCount, isStartCap);
}
}
break;
case CrossSectionCases.VerticesOnly: // VerticesOnly to VerticesOnly
{
for (int i = 0; i < crossSectionVertexCount; ++i)
{
AddIndices(voffset0 + ((i == 0) ? crossSectionVertexCount - 1 : i - 1), voffset0 + i, voffset1 + i, isStartCap);
AddIndices(voffset0 + ((i == 0) ? crossSectionVertexCount - 1 : i - 1), voffset1 + i, voffset1 + ((i == 0) ? crossSectionVertexCount - 1 : i - 1), isStartCap);
}
}
break;
case CrossSectionCases.Regular: // VerticesOnly to regular
{
throw new NotImplementedException();
}
//break;
default:
throw new NotImplementedException();
}
}
break;
case CrossSectionCases.Regular:
{
switch (currentCrossSectionType)
{
case CrossSectionCases.MiddlePointSmooth: // Regular to MiddlePointOnly
{
for (int i = 0, j = 0; i < crossSectionVertexCount; ++i, ++j)
{
AddIndices(voffset0 + ((j == 0) ? crossSectionNormalCount - 1 : j - 1), voffset0 + j, voffset1, isStartCap);
if (lineCrossSection.IsVertexSharp(i))
{
++j;
}
}
}
break;
case CrossSectionCases.MiddlePointSharp: // Regular to MiddlePointSharp
{
for (int i = 0, j = 0; i < crossSectionVertexCount; ++i, ++j)
{
AddIndices(voffset0 + ((j == 0) ? crossSectionNormalCount - 1 : j - 1), voffset0 + j, voffset1 + i, isStartCap);
if (lineCrossSection.IsVertexSharp(i))
{
++j;
}
}
}
break;
case CrossSectionCases.VerticesOnly: // Regular to VerticesOnly
{
for (int i = 0, j = 0; i < crossSectionVertexCount; ++i, ++j)
{
AddIndices(voffset0 + ((j == 0) ? crossSectionNormalCount - 1 : j - 1), voffset0 + j, voffset1 + i, isStartCap);
AddIndices(voffset0 + ((j == 0) ? crossSectionNormalCount - 1 : j - 1), voffset1 + i, voffset1 + ((i == 0) ? crossSectionVertexCount - 1 : i - 1), isStartCap);
if (lineCrossSection.IsVertexSharp(i))
{
++j;
}
}
}
break;
case CrossSectionCases.Regular: // Regular to Regular
{
for (int i = 0, j = 0; i < crossSectionVertexCount; ++i, ++j)
{
AddIndices(voffset0 + ((j == 0) ? crossSectionNormalCount - 1 : j - 1), voffset0 + j, voffset1 + j, isStartCap);
AddIndices(voffset0 + ((j == 0) ? crossSectionNormalCount - 1 : j - 1), voffset1 + j, voffset1 + ((j == 0) ? crossSectionNormalCount - 1 : j - 1), isStartCap);
if (lineCrossSection.IsVertexSharp(i))
{
++j;
}
}
}
break;
default:
throw new NotImplementedException();
}
}
break;
default:
throw new NotImplementedException();
}
}
if (!isOnSecondSideOfContourVertexSharp && capContour.IsVertexSharp(contourVertexIndex) && contourVertexIndex < (contourVertexCount - 1))
{
previousContourVertexIndex = contourVertexIndex;
--contourVertexIndex; // trick: decrement the vertex index, it is incremented then again in the following for loop, so that contourVertexIndex stays constant
isOnSecondSideOfContourVertexSharp = true;
continue;
}
isOnSecondSideOfContourVertexSharp = false;
// now we switch the current calculated positions and normals with the old ones
previousCrossSectionType = currentCrossSectionType;
previousGeneratedPoints = currentGeneratedPoints;
previousContourVertexIndex = contourVertexIndex;
}
}
/// <summary>
/// Adds the triangle geometry. Here, the position of the startcap base and of the endcap base is already calculated and provided in the arguments.
/// </summary>
/// <param name="AddPositionAndNormal">The procedure to add a vertex position and normal.</param>
/// <param name="AddIndices">The procedure to add vertex indices for one triangle.</param>
/// <param name="vertexIndexOffset">The vertex index offset.</param>
/// <param name="lineStart">The line start. This is the precalculated base of the start line cap.</param>
/// <param name="lineEnd">The line end. Here, this is the precalculated base of the end line cap.</param>
/// <param name="drawLine">If this parameter is true, the line segment between lineStart and lineEnd is drawn. If false, the line segment itself is not drawn, but the start end end caps are drawn.</param>
/// <param name="overrideStartCap">If not null, this parameter override the start cap that is stored in this class.</param>
/// <param name="overrideEndCap">If not null, this parameter overrides the end cap that is stored in this class.</param>
/// <exception cref="System.InvalidProgramException">The structure is not initialized yet. Call Initialize before using it!</exception>
public void AddGeometry(
Action <PointD3D, VectorD3D> AddPositionAndNormal,
Action <int, int, int, bool> AddIndices,
ref int vertexIndexOffset,
PointD3D lineStart,
PointD3D lineEnd,
bool drawLine,
ILineCap overrideStartCap,
ILineCap overrideEndCap
)
{
if (null == _lastNormalsTransformed)
{
throw new InvalidProgramException("The structure is not initialized yet. Call Initialize before using it!");
}
var resultingStartCap = overrideStartCap ?? _dashStartCap;
var resultingEndCap = overrideEndCap ?? _dashEndCap;
// draw the straight line if the remaining line length is >0
if (drawLine)
{
// Get the matrix for the start plane
var matrix = Math3D.Get2DProjectionToPlane(_westVector, _northVector, lineStart);
for (int i = 0; i < _crossSectionVertexCount; ++i)
{
_lastPositionsTransformedStart[i] = matrix.Transform(_crossSection.Vertices(i));
}
matrix = Math3D.Get2DProjectionToPlane(_westVector, _northVector, lineEnd);
for (int i = 0; i < _crossSectionVertexCount; ++i)
{
_lastPositionsTransformedEnd[i] = matrix.Transform(_crossSection.Vertices(i));
}
// draw the line segment now
var currIndex = vertexIndexOffset;
for (int i = 0, j = 0; i < _crossSectionVertexCount; ++i, ++j)
{
if (j == 0)
{
AddIndices(currIndex, currIndex + 1, currIndex + 2 * _crossSectionNormalCount - 2, false);
AddIndices(currIndex + 2 * _crossSectionNormalCount - 2, currIndex + 1, currIndex + 2 * _crossSectionNormalCount - 1, false);
}
else
{
AddIndices(currIndex, currIndex + 1, currIndex - 2, false);
AddIndices(currIndex - 2, currIndex + 1, currIndex - 1, false);
}
AddPositionAndNormal(_lastPositionsTransformedStart[i], _lastNormalsTransformed[j]);
AddPositionAndNormal(_lastPositionsTransformedEnd[i], _lastNormalsTransformed[j]);
currIndex += 2;
if (_crossSection.IsVertexSharp(i))
{
++j;
AddPositionAndNormal(_lastPositionsTransformedStart[i], _lastNormalsTransformed[j]);
AddPositionAndNormal(_lastPositionsTransformedEnd[i], _lastNormalsTransformed[j]);
currIndex += 2;
}
}
vertexIndexOffset = currIndex;
}
// now the start cap
if (null != resultingStartCap)
{
resultingStartCap.AddGeometry(
AddPositionAndNormal,
AddIndices,
ref vertexIndexOffset,
true,
lineStart,
_westVector,
_northVector,
_forwardVector,
_crossSection,
drawLine ? _lastPositionsTransformedStart : null,
_lastNormalsTransformed,
ref _startCapTemporaryStorageSpace);
}
else if (drawLine)
{
LineCaps.Flat.AddGeometry(
AddPositionAndNormal,
AddIndices,
ref vertexIndexOffset,
true,
lineStart,
_forwardVector,
_lastPositionsTransformedStart
);
}
if (null != resultingEndCap)
{
resultingEndCap.AddGeometry(
AddPositionAndNormal,
AddIndices,
ref vertexIndexOffset,
false,
lineEnd,
_westVector,
_northVector,
_forwardVector,
_crossSection,
drawLine ? _lastPositionsTransformedEnd : null,
_lastNormalsTransformed,
ref _endCapTemporaryStorageSpace);
}
else if (drawLine)
{
LineCaps.Flat.AddGeometry(
AddPositionAndNormal,
AddIndices,
ref vertexIndexOffset,
false,
lineEnd,
_forwardVector,
_lastPositionsTransformedEnd
);
}
}
public static void Add(
Action<PointD3D, VectorD3D> AddPositionAndNormal,
Action<int, int, int, bool> AddIndices,
ref int vertexIndexOffset,
bool isStartCap,
PointD3D basePoint,
VectorD3D westVector,
VectorD3D northVector,
VectorD3D forwardVectorNormalized,
ICrossSectionOfLine lineCrossSection,
PointD3D[] crossSectionPositions,
VectorD3D[] crossSectionNormals,
ref object temporaryStorageSpace,
ILineCapContour capContour
)
{
var crossSectionVertexCount = lineCrossSection.NumberOfVertices;
var crossSectionNormalCount = lineCrossSection.NumberOfNormals;
var contourZScale = 0.5 * Math.Max(lineCrossSection.Size1, lineCrossSection.Size2);
// do we need a flat end at the beginning of the cap?
if (null == crossSectionPositions && // if lineCrossSectionPositions are null, it means that our cap is not connected to the line and needs a flat end
capContour.Vertices(0) == _pointD2D_0_1) // furthermore the cap assumes to be started at the cross section
{
// the parameter isStartCap must be negated, because this flat cap is the "counterpart" of our cap to draw
Flat.AddGeometry(
AddPositionAndNormal,
AddIndices,
ref vertexIndexOffset,
!isStartCap,
basePoint,
westVector,
northVector,
forwardVectorNormalized,
lineCrossSection);
}
if (isStartCap)
forwardVectorNormalized = -forwardVectorNormalized;
var contourVertexCount = capContour.NumberOfVertices;
var contourNormalCount = capContour.NumberOfNormals;
// now the calculation can start
CrossSectionCases previousCrossSectionType = CrossSectionCases.MiddlePointSmooth;
int previousGeneratedPoints = 0;
int previousContourVertexIndex = 0;
bool isOnSecondSideOfContourVertexSharp = true;
for (int contourVertexIndex = 0, contourNormalIndex = 0; contourVertexIndex < contourVertexCount; ++contourVertexIndex, ++contourNormalIndex)
{
// we have 4 different situations here:
// 1st) the crossSection.Y is zero, thus this is the middle point (the normal should then go in z-direction) -> we need only one single vertex and normal for that
// 2nd) the countour normal is in x-direction -> we need only a point for each crossSection vertex, but not for each crossSectionNormal
// 3rd) the regular case -> we need a point for each crossSection normal
var capContourVertex = capContour.Vertices(contourVertexIndex);
var capContourNormal = capContour.Normals(contourNormalIndex);
CrossSectionCases currentCrossSectionType;
if (capContourVertex.Y == 0 && capContourNormal.Y == 0)
currentCrossSectionType = CrossSectionCases.MiddlePointSmooth;
else if (capContourVertex.Y == 0)
currentCrossSectionType = CrossSectionCases.MiddlePointSharp;
else if (0 == capContourNormal.Y)
currentCrossSectionType = CrossSectionCases.VerticesOnly;
else
currentCrossSectionType = CrossSectionCases.Regular;
var currentLocation = basePoint + forwardVectorNormalized * capContourVertex.X * contourZScale;
var matrix = Matrix4x3.NewFromBasisVectorsAndLocation(westVector, northVector, forwardVectorNormalized, currentLocation);
int currentGeneratedPoints = 0;
switch (currentCrossSectionType)
{
case CrossSectionCases.MiddlePointSmooth:
{
var position = matrix.Transform(PointD2D.Empty);
var normal = matrix.Transform(new VectorD3D(0, 0, capContourNormal.X));
AddPositionAndNormal(position, normal);
currentGeneratedPoints = 1;
}
break;
case CrossSectionCases.MiddlePointSharp:
{
for (int i = 0, j = 0; i < crossSectionVertexCount; ++i, ++j)
{
var normal1 = (i == 0) ? lineCrossSection.Normals(crossSectionNormalCount - 1) : lineCrossSection.Normals(j - 1);
var normal2 = lineCrossSection.Normals(j);
var sn = (normal1 + normal2).Normalized;
var utNormal = GetNormalVector(lineCrossSection.Vertices(i), sn, capContourNormal, contourZScale);
AddPositionAndNormal(currentLocation, matrix.Transform(utNormal)); // store the tip point with the averaged normal
if (lineCrossSection.IsVertexSharp(i))
{
++j;
}
}
currentGeneratedPoints = crossSectionVertexCount;
}
break;
case CrossSectionCases.VerticesOnly:
{
var commonNormal = matrix.Transform(new VectorD3D(0, 0, capContourNormal.X));
for (int i = 0; i < crossSectionVertexCount; ++i)
{
var position = matrix.Transform(lineCrossSection.Vertices(i) * capContourVertex.Y);
AddPositionAndNormal(position, commonNormal);
}
currentGeneratedPoints = crossSectionVertexCount;
}
break;
case CrossSectionCases.Regular:
{
for (int i = 0, j = 0; i < crossSectionVertexCount; ++i, ++j)
{
var sp = lineCrossSection.Vertices(i);
var sn = lineCrossSection.Normals(j);
var utNormal = GetNormalVector(sp, sn, capContourNormal, contourZScale);
var position = matrix.Transform(sp * capContourVertex.Y);
var normal = matrix.Transform(utNormal);
AddPositionAndNormal(position, normal);
if (lineCrossSection.IsVertexSharp(i))
{
++j;
sn = lineCrossSection.Normals(j);
utNormal = GetNormalVector(sp, sn, capContourNormal, contourZScale);
normal = matrix.Transform(utNormal);
AddPositionAndNormal(position, normal);
}
}
currentGeneratedPoints = crossSectionNormalCount;
}
break;
default:
throw new NotImplementedException();
}
vertexIndexOffset += currentGeneratedPoints;
// now we start generating triangles
if (contourVertexIndex > previousContourVertexIndex)
{
int voffset1 = vertexIndexOffset - currentGeneratedPoints;
int voffset0 = voffset1 - previousGeneratedPoints;
switch (previousCrossSectionType)
{
case CrossSectionCases.MiddlePointSmooth:
{
switch (currentCrossSectionType)
{
case CrossSectionCases.MiddlePointSmooth: // Middle point to middle point
{
// no triangles, since from middle point to middle point we have an infinity thin line
}
break;
case CrossSectionCases.MiddlePointSharp: // Middle point to middle point
{
// no triangles, since from middle point to middle point we have an infinity thin line
}
break;
case CrossSectionCases.VerticesOnly: // Middle point to vertices only
{
for (int i = 0; i < crossSectionVertexCount; ++i)
{
AddIndices(voffset0, voffset1 + i, voffset1 + (i + 1) % crossSectionVertexCount, isStartCap);
}
}
break;
case CrossSectionCases.Regular: // Middle point to regular
{
for (int i = 0; i < crossSectionNormalCount; ++i)
{
AddIndices(voffset0, voffset1 + i, voffset1 + (i + 1) % crossSectionNormalCount, isStartCap);
}
}
break;
default:
throw new NotImplementedException();
}
}
break;
case CrossSectionCases.MiddlePointSharp:
{
switch (currentCrossSectionType)
{
case CrossSectionCases.MiddlePointSmooth: // Middle point to middle point
{
// no triangles, since from middle point to middle point we have an infinity thin line
}
break;
case CrossSectionCases.MiddlePointSharp: // Middle point to middle point
{
// no triangles, since from middle point to middle point we have an infinity thin line
}
break;
case CrossSectionCases.VerticesOnly: // MiddlePointSharp to VerticesOnly
{
for (int i = 0; i < crossSectionVertexCount; ++i)
{
AddIndices(voffset0, voffset1 + i, voffset1 + (i + 1) % crossSectionVertexCount, isStartCap);
}
}
break;
case CrossSectionCases.Regular: // MiddlePointSharp to Regular
{
for (int i = 0, j = 0; i < crossSectionNormalCount; ++i, ++j)
{
AddIndices(voffset0 + i, voffset1 + i, voffset1 + (i + 1) % crossSectionNormalCount, isStartCap);
}
}
break;
default:
throw new NotImplementedException();
}
}
break;
case CrossSectionCases.VerticesOnly:
{
switch (currentCrossSectionType)
{
case CrossSectionCases.MiddlePointSmooth: // VerticesOnly to MiddlePoint
{
for (int i = 0; i < crossSectionVertexCount; ++i)
{
AddIndices(voffset1, voffset0 + i, voffset0 + (i + 1) % crossSectionVertexCount, isStartCap);
}
}
break;
case CrossSectionCases.VerticesOnly: // VerticesOnly to VerticesOnly
{
for (int i = 0; i < crossSectionVertexCount; ++i)
{
AddIndices(voffset0 + ((i == 0) ? crossSectionVertexCount - 1 : i - 1), voffset0 + i, voffset1 + i, isStartCap);
AddIndices(voffset0 + ((i == 0) ? crossSectionVertexCount - 1 : i - 1), voffset1 + i, voffset1 + ((i == 0) ? crossSectionVertexCount - 1 : i - 1), isStartCap);
}
}
break;
case CrossSectionCases.Regular: // VerticesOnly to regular
{
throw new NotImplementedException();
}
//break;
default:
throw new NotImplementedException();
}
}
break;
case CrossSectionCases.Regular:
{
switch (currentCrossSectionType)
{
case CrossSectionCases.MiddlePointSmooth: // Regular to MiddlePointOnly
{
for (int i = 0, j = 0; i < crossSectionVertexCount; ++i, ++j)
{
AddIndices(voffset0 + ((j == 0) ? crossSectionNormalCount - 1 : j - 1), voffset0 + j, voffset1, isStartCap);
if (lineCrossSection.IsVertexSharp(i))
++j;
}
}
break;
case CrossSectionCases.MiddlePointSharp: // Regular to MiddlePointSharp
{
for (int i = 0, j = 0; i < crossSectionVertexCount; ++i, ++j)
{
AddIndices(voffset0 + ((j == 0) ? crossSectionNormalCount - 1 : j - 1), voffset0 + j, voffset1 + i, isStartCap);
if (lineCrossSection.IsVertexSharp(i))
++j;
}
}
break;
case CrossSectionCases.VerticesOnly: // Regular to VerticesOnly
{
for (int i = 0, j = 0; i < crossSectionVertexCount; ++i, ++j)
{
AddIndices(voffset0 + ((j == 0) ? crossSectionNormalCount - 1 : j - 1), voffset0 + j, voffset1 + i, isStartCap);
AddIndices(voffset0 + ((j == 0) ? crossSectionNormalCount - 1 : j - 1), voffset1 + i, voffset1 + ((i == 0) ? crossSectionVertexCount - 1 : i - 1), isStartCap);
if (lineCrossSection.IsVertexSharp(i))
++j;
}
}
break;
case CrossSectionCases.Regular: // Regular to Regular
{
for (int i = 0, j = 0; i < crossSectionVertexCount; ++i, ++j)
{
AddIndices(voffset0 + ((j == 0) ? crossSectionNormalCount - 1 : j - 1), voffset0 + j, voffset1 + j, isStartCap);
AddIndices(voffset0 + ((j == 0) ? crossSectionNormalCount - 1 : j - 1), voffset1 + j, voffset1 + ((j == 0) ? crossSectionNormalCount - 1 : j - 1), isStartCap);
if (lineCrossSection.IsVertexSharp(i))
++j;
}
}
break;
default:
throw new NotImplementedException();
}
}
break;
default:
throw new NotImplementedException();
}
}
if (!isOnSecondSideOfContourVertexSharp && capContour.IsVertexSharp(contourVertexIndex) && contourVertexIndex < (contourVertexCount - 1))
{
previousContourVertexIndex = contourVertexIndex;
--contourVertexIndex; // trick: decrement the vertex index, it is incremented then again in the following for loop, so that contourVertexIndex stays constant
isOnSecondSideOfContourVertexSharp = true;
continue;
}
isOnSecondSideOfContourVertexSharp = false;
// now we switch the current calculated positions and normals with the old ones
previousCrossSectionType = currentCrossSectionType;
previousGeneratedPoints = currentGeneratedPoints;
previousContourVertexIndex = contourVertexIndex;
}
}