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#7 Code refactoring and cleanup
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@artem-ogre
artem-ogre committed Aug 22, 2023
1 parent 498b7eb commit 88c8ce6
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Showing 4 changed files with 66 additions and 76 deletions.
2 changes: 2 additions & 0 deletions CDT/include/CDTUtils.h
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Expand Up @@ -463,6 +463,8 @@ sineOfSmallestAngle(const V2d<T>& a, const V2d<T>& b, const V2d<T>& c);
template <typename T>
CDT_EXPORT T smallestAngle(const V2d<T>& a, const V2d<T>& b, const V2d<T>& c);

CDT_EXPORT bool touchesSuperTriangle(const Triangle& t);

} // namespace CDT

#ifndef CDT_USE_AS_COMPILED_LIBRARY
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5 changes: 5 additions & 0 deletions CDT/include/CDTUtils.hpp
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Expand Up @@ -363,4 +363,9 @@ T smallestAngle(const V2d<T>& a, const V2d<T>& b, const V2d<T>& c)
return std::asin(angleSine);
}

bool touchesSuperTriangle(const Triangle& t)
{
return t.vertices[0] < 3 || t.vertices[1] < 3 || t.vertices[2] < 3;
}

} // namespace CDT
21 changes: 7 additions & 14 deletions CDT/include/Triangulation.h
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Expand Up @@ -520,16 +520,13 @@ class CDT_EXPORT Triangulation
const Triangle& tri,
RefinementCriterion::Enum refinementCriterion,
T refinementThreshold) const;
/// Search in all fixed edges to find encroached edges, each fixed edge is
/// checked against its opposite vertices
/// Returns queue of encroached edges
EdgeQueue detectEncroachedEdges();
/// Search in all fixed edges to find encroached edges, each fixed edge is
/// checked against its opposite vertices and vertex v
/// Returns queue of encroached edges
EdgeQueue detectEncroachedEdges(const V2d<T>& v);
/// Check if edge is encroached by its opposed vertices
bool isEdgeEncroached(const Edge& edge) const;
/// Find all fixed edges encroached by its opposed vertices
EdgeQueue allEncroachedEdges() const;
/// Find all fixed edges encroached by a given vertex
EdgeQueue edgesEncroachedBy(const V2d<T>& v) const;
/// Recursively split encroached edges
/// @return vector of badly shaped triangles
TriIndVec resolveEncroachedEdges(
EdgeQueue encroachedEdges,
VertInd& newVertBudget,
Expand All @@ -538,11 +535,7 @@ class CDT_EXPORT Triangulation
RefinementCriterion::Enum refinementCriterion =
RefinementCriterion::SmallestAngle,
T badTriangleThreshold = T(0));
VertInd splitEncroachedEdge(
Edge e,
TriInd iT,
TriInd iTopo,
VertInd steinerVerticesOffset);
VertInd splitEncroachedEdge(Edge edge, VertInd steinerVerticesOffset);
void changeNeighbor(TriInd iT, TriInd oldNeighbor, TriInd newNeighbor);
void changeNeighbor(
TriInd iT,
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114 changes: 52 additions & 62 deletions CDT/include/Triangulation.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -136,8 +136,7 @@ void Triangulation<T, TNearPointLocator>::eraseSuperTriangle()
TriIndUSet toErase;
for(TriInd iT(0); iT < TriInd(triangles.size()); ++iT)
{
Triangle& t = triangles[iT];
if(t.vertices[0] < 3 || t.vertices[1] < 3 || t.vertices[2] < 3)
if(touchesSuperTriangle(triangles[iT]))
toErase.insert(iT);
}
finalizeTriangulation(toErase);
Expand Down Expand Up @@ -1283,25 +1282,31 @@ bool Triangulation<T, TNearPointLocator>::isRefinementNeeded(
}

template <typename T, typename TNearPointLocator>
EdgeQueue Triangulation<T, TNearPointLocator>::detectEncroachedEdges()
bool Triangulation<T, TNearPointLocator>::isEdgeEncroached(
const Edge& edge) const
{
// Search in all fixed edges to find encroached edges, each fixed edge is
// checked against its opposite vertices
TriInd iT, iTopo;
std::tie(iT, iTopo) = edgeTriangles(edge.v1(), edge.v2());
assert(iT != invalidIndex && iTopo != invalidIndex);
const VertInd v1 = opposedVertex(triangles[iT], iTopo);
const VertInd v2 = opposedVertex(triangles[iTopo], iT);
const V2d<T>& edgeStart = vertices[edge.v1()];
const V2d<T>& edgeEnd = vertices[edge.v2()];
return isEncroachingOnEdge(vertices[v1], edgeStart, edgeEnd) ||
isEncroachingOnEdge(vertices[v2], edgeStart, edgeEnd);
}

template <typename T, typename TNearPointLocator>
EdgeQueue Triangulation<T, TNearPointLocator>::allEncroachedEdges() const
{
// Search in all fixed edges to find encroached edges
// Returns queue of encroached edges
EdgeQueue encroachedEdges;
typedef EdgeUSet::const_iterator Iter;
for(Iter it = fixedEdges.begin(); it != fixedEdges.end(); ++it)
{
const Edge edge = *it;
TriInd iT, iTopo;
std::tie(iT, iTopo) = edgeTriangles(edge.v1(), edge.v2());
assert(iT != invalidIndex && iTopo != invalidIndex);
const VertInd v1 = opposedVertex(triangles[iT], iTopo);
const VertInd v2 = opposedVertex(triangles[iTopo], iT);
const V2d<T>& edgeStart = vertices[edge.v1()];
const V2d<T>& edgeEnd = vertices[edge.v2()];
if(isEncroachingOnEdge(vertices[v1], edgeStart, edgeEnd) ||
isEncroachingOnEdge(vertices[v2], edgeStart, edgeEnd))
if(isEdgeEncroached(edge))
{
encroachedEdges.push(edge);
}
Expand All @@ -1311,11 +1316,10 @@ EdgeQueue Triangulation<T, TNearPointLocator>::detectEncroachedEdges()

template <typename T, typename TNearPointLocator>
EdgeQueue
Triangulation<T, TNearPointLocator>::detectEncroachedEdges(const V2d<T>& v)
Triangulation<T, TNearPointLocator>::edgesEncroachedBy(const V2d<T>& v) const
{
// Search in all fixed edges to find encroached edges, each fixed edge is
// checked against its opposite vertices and vertex v
// Returns queue of encroached edges
// Search in all fixed edges to find edges encroached by v, each fixed edge
// is checked vertex v Returns queue of encroached edges
EdgeQueue encroachedEdges;
typedef EdgeUSet::const_iterator Iter;
for(Iter it = fixedEdges.begin(); it != fixedEdges.end(); ++it)
Expand Down Expand Up @@ -1349,29 +1353,26 @@ TriIndVec Triangulation<T, TNearPointLocator>::resolveEncroachedEdges(
{
continue;
}
TriInd iT, iTopo;
std::tie(iT, iTopo) = edgeTriangles(edge.v1(), edge.v2());
assert(iT != invalidIndex && iTopo != invalidIndex);
const VertInd i =
splitEncroachedEdge(edge, iT, iTopo, steinerVerticesOffset);
// split encroached edge
const VertInd iSplitVert =
splitEncroachedEdge(edge, steinerVerticesOffset);
--remainingVertexBudget;

const TriInd start = m_vertTris[i];
TriInd currTri = start;
const TriInd start = m_vertTris[iSplitVert];
TriInd iT = start;
do
{
const Triangle& t = triangles[currTri];
const Triangle& t = triangles[iT];
if(circumcenterOrNull &&
isRefinementNeeded(t, refinementCriterion, badTriangleThreshold))
{
badTriangles.push_back(currTri);
badTriangles.push_back(iT);
}
for(int i = 0; i < 3; ++i)
{
const Edge edge(t.vertices[i], t.vertices[cw(i)]);
if(fixedEdges.find(edge) == fixedEdges.end())
continue;
const TriInd iT = currTri;
const TriInd iTopo =
edgeNeighbor(triangles[iT], edge.v1(), edge.v2());
const Triangle& tOpo = triangles[iTopo];
Expand All @@ -1388,26 +1389,26 @@ TriIndVec Triangulation<T, TNearPointLocator>::resolveEncroachedEdges(
encroachedEdges.push(edge);
}
}
currTri = t.next(i).first;
} while(currTri != start);
iT = t.next(iSplitVert).first;
} while(iT != start);
}
return badTriangles;
}

template <typename T, typename TNearPointLocator>
VertInd Triangulation<T, TNearPointLocator>::splitEncroachedEdge(
const Edge splitEdge,
const TriInd iT,
const TriInd iTopo,
const Edge edge,
const VertInd steinerVerticesOffset)
{
TriInd iT, iTopo;
std::tie(iT, iTopo) = edgeTriangles(edge.v1(), edge.v2());
assert(iT != invalidIndex && iTopo != invalidIndex);
const VertInd iMid = static_cast<VertInd>(vertices.size());
const V2d<T>& start = vertices[splitEdge.v1()];
const V2d<T>& end = vertices[splitEdge.v2()];
const V2d<T>& start = vertices[edge.v1()];
const V2d<T>& end = vertices[edge.v2()];
T split = T(0.5);
// check if any of the split edge vertices are Steiner vertices
if(splitEdge.v1() >= steinerVerticesOffset ||
splitEdge.v2() >= steinerVerticesOffset)
if(edge.v1() >= steinerVerticesOffset || edge.v2() >= steinerVerticesOffset)
{
// In Ruppert's paper, he used D(0.01) factor to divide edge length, but
// that introduces FP rounding erros, so it's avoided.
Expand All @@ -1425,29 +1426,29 @@ VertInd Triangulation<T, TNearPointLocator>::splitEncroachedEdge(
}
assert(abs(nearestPowerOfTwo - pow(2, round(log(d) / log(2.0)))) < 1e6);
split = nearestPowerOfTwo / len;
if(splitEdge.v1() >= steinerVerticesOffset)
if(edge.v1() >= steinerVerticesOffset)
split = T(1) - split;
}
const V2d<T> mid = V2d<T>::make(
detail::lerp(start.x, end.x, split),
detail::lerp(start.y, end.y, split));

// split constraint edge that already exists in triangulation
if(fixedEdges.find(splitEdge) != fixedEdges.end())
if(fixedEdges.find(edge) != fixedEdges.end())
{
const Edge half1(splitEdge.v1(), iMid);
const Edge half2(iMid, splitEdge.v2());
const BoundaryOverlapCount overlaps = overlapCount[splitEdge];
const Edge half1(edge.v1(), iMid);
const Edge half2(iMid, edge.v2());
const BoundaryOverlapCount overlaps = overlapCount[edge];
// remove the edge that will be split
fixedEdges.erase(splitEdge);
overlapCount.erase(splitEdge);
fixedEdges.erase(edge);
overlapCount.erase(edge);
// add split edge's halves
fixEdge(half1, overlaps);
fixEdge(half2, overlaps);
// maintain piece-to-original mapping
EdgeVec newOriginals(1, splitEdge);
EdgeVec newOriginals(1, edge);
const unordered_map<Edge, EdgeVec>::const_iterator originalsIt =
pieceToOriginals.find(splitEdge);
pieceToOriginals.find(edge);
if(originalsIt != pieceToOriginals.end())
{ // edge being split was split before: pass-through originals
newOriginals = originalsIt->second;
Expand Down Expand Up @@ -2278,27 +2279,16 @@ void Triangulation<T, TNearPointLocator>::refineTriangles(
VertInd remainingVertexBudget = maxVerticesToInsert;
const VertInd steinerVerticesOffset = vertices.size();
resolveEncroachedEdges(
detectEncroachedEdges(), remainingVertexBudget, steinerVerticesOffset);
allEncroachedEdges(), remainingVertexBudget, steinerVerticesOffset);

std::queue<TriInd> badTriangles;
for(TriInd iT(0), n = triangles.size(); iT < n; ++iT)
{
const Triangle& t = triangles[iT];
if(t.vertices[0] < 3 || t.vertices[1] < 3 || t.vertices[2] < 3)
continue;

if(isRefinementNeeded(t, refinementCriterion, refinementThreshold))
if(!touchesSuperTriangle(t) &&
isRefinementNeeded(t, refinementCriterion, refinementThreshold))
{
const V2d<T> vert = circumcenter(
vertices[t.vertices[0]],
vertices[t.vertices[1]],
vertices[t.vertices[2]]);
if(locatePointTriangle(
vert, vertices[0], vertices[1], vertices[2]) !=
PtTriLocation::Outside)
{
badTriangles.push(iT);
}
badTriangles.push(iT);
}
}

Expand All @@ -2323,7 +2313,7 @@ void Triangulation<T, TNearPointLocator>::refineTriangles(
}

const TriIndVec badTris = resolveEncroachedEdges(
detectEncroachedEdges(vert),
edgesEncroachedBy(vert),
remainingVertexBudget,
steinerVerticesOffset,
&vert,
Expand Down

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