ccPolyline* ccContourExtractor::ExtractFlatContour( CCLib::GenericIndexedCloudPersist* points,
bool allowMultiPass,
PointCoordinateType maxEdgeLength/*=0*/,
const PointCoordinateType* preferredNormDim/*=0*/,
const PointCoordinateType* preferredUpDir/*=0*/,
ContourType contourType/*=FULL*/,
std::vector<unsigned>* originalPointIndexes/*=0*/,
bool enableVisualDebugMode/*=false*/,
double maxAngleDeg/*=0.0*/)
{
assert(points);
if (!points)
return 0;
unsigned ptsCount = points->size();
if (ptsCount < 3)
return 0;
CCLib::Neighbourhood Yk(points);
CCVector3 O,X,Y; //local base
bool useOXYasBase = false;
//we project the input points on a plane
std::vector<Vertex2D> points2D;
PointCoordinateType* planeEq = 0;
//if the user has specified a default direction, we'll use it as 'projecting plane'
PointCoordinateType preferredPlaneEq[4] = {0, 0, 0, 0};
if (preferredNormDim != 0)
{
const CCVector3* G = points->getPoint(0); //any point through which the point passes is ok
preferredPlaneEq[0] = preferredNormDim[0];
preferredPlaneEq[1] = preferredNormDim[1];
preferredPlaneEq[2] = preferredNormDim[2];
CCVector3::vnormalize(preferredPlaneEq);
preferredPlaneEq[3] = CCVector3::vdot(G->u, preferredPlaneEq);
planeEq = preferredPlaneEq;
if (preferredUpDir != 0)
{
O = *G;
Y = CCVector3(preferredUpDir);
X = Y.cross(CCVector3(preferredNormDim));
useOXYasBase = true;
}
}
if (!Yk.projectPointsOn2DPlane<Vertex2D>(points2D, planeEq, &O, &X, &Y, useOXYasBase))
{
ccLog::Warning("[ExtractFlatContour] Failed to project the points on the LS plane (not enough memory?)!");
return 0;
}
//update the points indexes (not done by Neighbourhood::projectPointsOn2DPlane)
{
for (unsigned i = 0; i < ptsCount; ++i)
points2D[i].index = i;
}
//try to get the points on the convex/concave hull to build the contour and the polygon
Hull2D hullPoints;
if (!ExtractConcaveHull2D( points2D,
hullPoints,
contourType,
allowMultiPass,
maxEdgeLength*maxEdgeLength,
enableVisualDebugMode,
maxAngleDeg))
{
ccLog::Warning("[ExtractFlatContour] Failed to compute the convex hull of the input points!");
return 0;
}
if (originalPointIndexes)
{
try
{
originalPointIndexes->resize(hullPoints.size(), 0);
}
catch (const std::bad_alloc&)
{
//not enough memory
ccLog::Error("[ExtractFlatContour] Not enough memory!");
return 0;
}
unsigned i=0;
for (Hull2D::const_iterator it = hullPoints.begin(); it != hullPoints.end(); ++it, ++i)
(*originalPointIndexes)[i] = (*it)->index;
}
unsigned hullPtsCount = static_cast<unsigned>(hullPoints.size());
//create vertices
ccPointCloud* contourVertices = new ccPointCloud();
{
if (!contourVertices->reserve(hullPtsCount))
{
delete contourVertices;
contourVertices = 0;
ccLog::Error("[ExtractFlatContour] Not enough memory!");
return 0;
}
//projection on the LS plane (in 3D)
for (Hull2D::const_iterator it = hullPoints.begin(); it != hullPoints.end(); ++it)
contourVertices->addPoint(O + X*(*it)->x + Y*(*it)->y);
contourVertices->setName("vertices");
contourVertices->setEnabled(false);
}
//we create the corresponding (3D) polyline
ccPolyline* contourPolyline = new ccPolyline(contourVertices);
if (contourPolyline->reserve(hullPtsCount))
{
contourPolyline->addPointIndex(0, hullPtsCount);
contourPolyline->setClosed(contourType == FULL);
contourPolyline->setVisible(true);
contourPolyline->setName("contour");
contourPolyline->addChild(contourVertices);
}
else
{
delete contourPolyline;
contourPolyline = 0;
ccLog::Warning("[ExtractFlatContour] Not enough memory to create the contour polyline!");
}
return contourPolyline;
}
ccPolyline* ccPolyline::ExtractFlatContour( CCLib::GenericIndexedCloudPersist* points,
PointCoordinateType maxEdgelLength/*=0*/,
const PointCoordinateType* preferredNormDim/*=0*/,
const PointCoordinateType* preferredUpDir/*=0*/,
ContourType contourType/*=FULL*/,
std::vector<unsigned>* originalPointIndexes/*=0*/)
{
assert(points);
if (!points)
return 0;
unsigned ptsCount = points->size();
if (ptsCount < 3)
return 0;
CCLib::Neighbourhood Yk(points);
CCVector3 O,X,Y; //local base
bool useOXYasBase = false;
//we project the input points on a plane
std::vector<CCLib::PointProjectionTools::IndexedCCVector2> points2D;
PointCoordinateType* planeEq = 0;
//if the user has specified a default direction, we'll use it as 'projecting plane'
PointCoordinateType preferredPlaneEq[4] = {0, 0, 0, 0};
if (preferredNormDim != 0)
{
const CCVector3* G = points->getPoint(0); //any point through which the point passes is ok
preferredPlaneEq[0] = preferredNormDim[0];
preferredPlaneEq[1] = preferredNormDim[1];
preferredPlaneEq[2] = preferredNormDim[2];
CCVector3::vnormalize(preferredPlaneEq);
preferredPlaneEq[3] = CCVector3::vdot(G->u,preferredPlaneEq);
planeEq = preferredPlaneEq;
if (preferredUpDir != 0)
{
O = *G;
Y = CCVector3(preferredUpDir);
X = Y.cross(CCVector3(preferredNormDim));
useOXYasBase = true;
}
}
if (!Yk.projectPointsOn2DPlane<CCLib::PointProjectionTools::IndexedCCVector2>(points2D,planeEq,&O,&X,&Y,useOXYasBase))
{
ccLog::Warning("[ccPolyline::ExtractFlatContour] Failed to project the points on the LS plane (not enough memory?)!");
return 0;
}
//update the points indexes (not done by Neighbourhood::projectPointsOn2DPlane)
{
for (unsigned i=0; i<ptsCount; ++i)
points2D[i].index = i;
}
//try to get the points on the convex/concave hull to build the contour and the polygon
Hull2D hullPoints;
if (!CCLib::PointProjectionTools::extractConcaveHull2D( points2D,
hullPoints,
maxEdgelLength*maxEdgelLength) )
{
ccLog::Warning("[ccPolyline::ExtractFlatContour] Failed to compute the convex hull of the input points!");
return 0;
}
bool isClosed = true;
if (contourType != FULL)
{
//look for the min and max 'X' coordinates (preferredNormDim and preferredUpDir should have been defined ;)
PointCoordinateType xMin = 0, xMax = 0;
{
unsigned i=0;
for (Hull2D::const_iterator it = hullPoints.begin(); it != hullPoints.end(); ++it, ++i)
{
const CCLib::PointProjectionTools::IndexedCCVector2* P = *it;
if (i != 0)
{
if (P->x < xMin)
xMin = P->x;
else if (P->x > xMax)
xMax = P->x;
}
else
{
xMin = xMax = P->x;
}
}
}
if (xMin != xMax)
{
//now identify the 'min' vertex
Hull2D::const_iterator firstIt = hullPoints.end();
{
for (Hull2D::const_iterator it = hullPoints.begin(); it != hullPoints.end(); ++it)
{
const CCLib::PointProjectionTools::IndexedCCVector2* P = *it;
if (P->x == xMin)
{
if ( firstIt == hullPoints.end()
//we take the lowest (resp highest) if multiple points with x == xMin
|| (contourType == LOWER && (*firstIt)->y > P->y)
|| (contourType == UPPER && (*firstIt)->y < P->y) )
{
firstIt = it;
}
}
}
}
assert(firstIt != hullPoints.end());
//now we are going to keep only the right part
try
{
//determine the right way
Hull2D::const_iterator prevIt = (firstIt != hullPoints.begin() ? firstIt : hullPoints.end()); --prevIt;
Hull2D::const_iterator nextIt = firstIt; ++nextIt; if (nextIt == hullPoints.end()) nextIt = hullPoints.begin();
bool forward = ( (contourType == LOWER && (*nextIt)->y < (*prevIt)->y)
|| (contourType == UPPER && (*nextIt)->y > (*prevIt)->y) );
if (!forward)
std::swap(prevIt,nextIt);
Hull2D hullPart;
hullPart.push_back(*firstIt);
nextIt = firstIt;
while ((*nextIt)->x != xMax)
{
if (forward)
{
++nextIt;
if (nextIt == hullPoints.end())
nextIt = hullPoints.begin();
}
else
{
if (nextIt == hullPoints.begin())
nextIt = hullPoints.end();
--nextIt;
}
hullPart.push_back(*nextIt);
}
hullPoints = hullPart;
isClosed = false;
}
catch(std::bad_alloc)
{
ccLog::Error("[ccPolyline::ExtractFlatContour] Not enough memory!");
return 0;
}
}
else //xMin == xMax
{
//flat contour?!
}
}
if (originalPointIndexes)
{
try
{
originalPointIndexes->resize(hullPoints.size(),0);
}
catch(std::bad_alloc)
{
//not enough memory
ccLog::Error("[ccPolyline::ExtractFlatContour] Not enough memory!");
return 0;
}
unsigned i=0;
for (Hull2D::const_iterator it = hullPoints.begin(); it != hullPoints.end(); ++it, ++i)
(*originalPointIndexes)[i] = (*it)->index;
}
unsigned hullPtsCount = static_cast<unsigned>(hullPoints.size());
//create vertices
ccPointCloud* contourVertices = new ccPointCloud();
{
if (!contourVertices->reserve(hullPtsCount))
{
delete contourVertices;
contourVertices = 0;
ccLog::Error("[ccPolyline::ExtractFlatContour] Not enough memory!");
return 0;
}
//projection on the LS plane (in 3D)
for (Hull2D::const_iterator it = hullPoints.begin(); it != hullPoints.end(); ++it)
contourVertices->addPoint(O + X*(*it)->x + Y*(*it)->y);
contourVertices->setName("vertices");
contourVertices->setEnabled(false);
}
//we create the corresponding (3D) polyline
ccPolyline* contourPolyline = new ccPolyline(contourVertices);
if (contourPolyline->reserve(hullPtsCount))
{
contourPolyline->addPointIndex(0,hullPtsCount);
contourPolyline->setClosed(isClosed);
contourPolyline->setVisible(true);
contourPolyline->setName("contour");
contourPolyline->addChild(contourVertices);
}
else
{
delete contourPolyline;
contourPolyline = 0;
ccLog::Warning("[ccPolyline::ExtractFlatContour] Not enough memory to create the contour polyline!");
}
return contourPolyline;
}
