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/*
* vim: ts=4 sw=4 et tw=0 wm=0
*
* libcola - A library providing force-directed network layout using the
* stress-majorization method subject to separation constraints.
*
* Copyright (C) 2010 Monash University
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* See the file LICENSE.LGPL distributed with the library.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Author(s): Michael Wybrow
*
*/
#include <sstream>
#include "libcola/cola.h"
#include "libcola/compound_constraints.h"
#include "libcola/cc_clustercontainmentconstraints.h"
using vpsc::XDIM;
using vpsc::YDIM;
namespace cola {
static const int AboveBoundary = 1;
static const int BelowBoundary = -1;
class ClusterShapeOffsets : public SubConstraintInfo
{
public:
ClusterShapeOffsets(unsigned ind, vpsc::Dim dim, double offset, int boundarySide,
unsigned int boundaryVar) :
SubConstraintInfo(ind),
offset(offset),
dim(dim),
boundarySide(boundarySide),
boundaryVar(boundaryVar)
{
}
double offset; // half the width or height value
vpsc::Dim dim; // The dimension
int boundarySide; // The boundary side we are constraining on.
unsigned int boundaryVar; // The boundary var.
};
ClusterContainmentConstraints::ClusterContainmentConstraints(Cluster *cluster,
unsigned int priority, std::vector<vpsc::Rectangle*>& boundingBoxes)
: CompoundConstraint(vpsc::HORIZONTAL, priority)
{
Box padding = cluster->padding();
_combineSubConstraints = true;
for (std::set<unsigned>::iterator curr = cluster->nodes.begin();
curr != cluster->nodes.end(); ++curr)
{
unsigned id = *curr;
double halfW = (boundingBoxes[id]->width() / 2.0);
double halfH = (boundingBoxes[id]->height() / 2.0);
_subConstraintInfo.push_back(new ClusterShapeOffsets(
id, XDIM, halfW + padding.min(XDIM), AboveBoundary,
cluster->clusterVarId));
_subConstraintInfo.push_back(new ClusterShapeOffsets(
id, XDIM, halfW + padding.max(XDIM), BelowBoundary,
cluster->clusterVarId + 1));
_subConstraintInfo.push_back(new ClusterShapeOffsets(
id, YDIM, halfH + padding.min(YDIM), AboveBoundary,
cluster->clusterVarId));
_subConstraintInfo.push_back(new ClusterShapeOffsets(
id, YDIM, halfH + padding.max(YDIM), BelowBoundary,
cluster->clusterVarId + 1));
}
for (std::vector<Cluster *>::iterator curr = cluster->clusters.begin();
curr != cluster->clusters.end(); ++curr)
{
Cluster *childCluster = *curr;
Box margin = childCluster->margin();
_subConstraintInfo.push_back(new ClusterShapeOffsets(
childCluster->clusterVarId, XDIM,
padding.min(XDIM) + margin.min(XDIM), AboveBoundary,
cluster->clusterVarId));
_subConstraintInfo.push_back(new ClusterShapeOffsets(
childCluster->clusterVarId + 1, XDIM,
padding.max(XDIM) + margin.max(XDIM), BelowBoundary,
cluster->clusterVarId + 1));
_subConstraintInfo.push_back(new ClusterShapeOffsets(
childCluster->clusterVarId, YDIM,
padding.min(YDIM) + margin.min(YDIM), AboveBoundary,
cluster->clusterVarId));
_subConstraintInfo.push_back(new ClusterShapeOffsets(
childCluster->clusterVarId + 1, YDIM,
padding.max(YDIM) + margin.max(YDIM), BelowBoundary,
cluster->clusterVarId + 1));
}
}
std::string ClusterContainmentConstraints::toString(void) const
{
std::ostringstream stream;
stream << "ClusterContainmentConstraints()";
return stream.str();
}
void ClusterContainmentConstraints::generateVariables(const vpsc::Dim dim,
vpsc::Variables& vars)
{
COLA_UNUSED(dim);
COLA_UNUSED(vars);
}
SubConstraintAlternatives
ClusterContainmentConstraints::getCurrSubConstraintAlternatives(vpsc::Variables vs[])
{
SubConstraintAlternatives alternatives;
ClusterShapeOffsets *info = static_cast<ClusterShapeOffsets *>
(_subConstraintInfo[_currSubConstraintIndex]);
assertValidVariableIndex(vs[_primaryDim], info->varIndex);
if (info->boundarySide == BelowBoundary)
{
// Constrain the objects with negative offsets to be
// to the left of the boundary.
vpsc::Constraint constraint = vpsc::Constraint(
vs[info->dim][info->varIndex], vs[info->dim][info->boundaryVar],
info->offset);
alternatives.push_back(SubConstraint(info->dim, constraint));
}
else
{
// Constrain the objects with positive offsets to be
// to the right of the boundary.
vpsc::Constraint constraint = vpsc::Constraint(
vs[info->dim][info->boundaryVar], vs[info->dim][info->varIndex],
info->offset);
alternatives.push_back(SubConstraint(info->dim, constraint));
}
//fprintf(stderr, "===== BOUNDARYLINE ALTERNATIVES -======\n");
return alternatives;
}
void ClusterContainmentConstraints::generateSeparationConstraints(
const vpsc::Dim dim, vpsc::Variables& vs, vpsc::Constraints& cs,
std::vector<vpsc::Rectangle*>& bbs)
{
COLA_UNUSED(bbs);
for (SubConstraintInfoList::iterator o = _subConstraintInfo.begin();
o != _subConstraintInfo.end(); ++o)
{
ClusterShapeOffsets *info = static_cast<ClusterShapeOffsets *> (*o);
if (info->dim != dim)
{
continue;
}
vpsc::Constraint *constraint = nullptr;
if (info->boundarySide == BelowBoundary)
{
// Constrain the objects with negative offsets to be
// to the left of the boundary.
constraint = new vpsc::Constraint(vs[info->varIndex],
vs[info->boundaryVar], info->offset);
}
else
{
// Constrain the objects with positive offsets to be
// to the right of the boundary.
constraint = new vpsc::Constraint(vs[info->boundaryVar],
vs[info->varIndex], info->offset);
}
constraint->creator = this;
cs.push_back(constraint);
}
}
} // namespace cola
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