void PlanarDrawLayout::doCall(
const Graph &G,
adjEntry adjExternal,
GridLayout &gridLayout,
IPoint &boundingBox,
bool fixEmbedding)
{
// require to have a planar graph without multi-edges and self-loops;
// planarity is checked below
OGDF_ASSERT(isSimple(G) && isLoopFree(G));
// handle special case of graphs with less than 3 nodes
if(G.numberOfNodes() < 3)
{
node v1, v2;
switch(G.numberOfNodes())
{
case 0:
boundingBox = IPoint(0,0);
return;
case 1:
v1 = G.firstNode();
gridLayout.x(v1) = gridLayout.y(v1) = 0;
boundingBox = IPoint(0,0);
return;
case 2:
v1 = G.firstNode();
v2 = G.lastNode ();
gridLayout.x(v1) = gridLayout.y(v1) = gridLayout.y(v2) = 0;
gridLayout.x(v2) = 1;
boundingBox = IPoint(1,0);
return;
}
}
// we make a copy of G since we use planar biconnected augmentation
GraphCopySimple GC(G);
if(fixEmbedding) {
PlanarAugmentationFix augmenter;
augmenter.call(GC);
} else {
// augment graph planar biconnected
m_augmenter.get().call(GC);
// embed augmented graph
PlanarModule pm;
bool isPlanar = pm.planarEmbed(GC);
if(isPlanar == false)
OGDF_THROW_PARAM(PreconditionViolatedException, pvcPlanar);
}
// compute shelling order
m_computeOrder.get().baseRatio(m_baseRatio);
ShellingOrder order;
m_computeOrder.get().call(GC,order,adjExternal);
// compute grid coordinates for GC
NodeArray<int> x(GC), y(GC);
computeCoordinates(GC,order,x,y);
boundingBox.m_x = x[order(1,order.len(1))];
boundingBox.m_y = 0;
node v;
forall_nodes(v,GC)
if(y[v] > boundingBox.m_y) boundingBox.m_y = y[v];
// copy coordinates from GC to G
forall_nodes(v,G) {
node vCopy = GC.copy(v);
gridLayout.x(v) = x[vCopy];
gridLayout.y(v) = y[vCopy];
}
void PlanarStraightLayout::doCall(
const Graph &G,
adjEntry adjExternal,
GridLayout &gridLayout,
IPoint &boundingBox,
bool fixEmbedding)
{
// require to have a planar graph without multi-edges and self-loops;
// planarity is checked below
OGDF_ASSERT(isSimple(G) && isLoopFree(G));
// handle special case of graphs with less than 3 nodes
if(G.numberOfNodes() < 3)
{
node v1, v2;
switch(G.numberOfNodes())
{
case 0:
boundingBox = IPoint(0,0);
return;
case 1:
v1 = G.firstNode();
gridLayout.x(v1) = gridLayout.y(v1) = 0;
boundingBox = IPoint(0,0);
return;
case 2:
v1 = G.firstNode();
v2 = G.lastNode ();
gridLayout.x(v1) = gridLayout.y(v1) = gridLayout.y(v2) = 0;
gridLayout.x(v2) = 1;
boundingBox = IPoint(1,0);
return;
}
}
// we make a copy of G since we use planar biconnected augmentation
GraphCopySimple GC(G);
if(fixEmbedding) {
// determine adjacency entry on external face of GC (if required)
if(adjExternal != 0) {
edge eG = adjExternal->theEdge();
edge eGC = GC.copy(eG);
adjExternal = (adjExternal == eG->adjSource()) ? eGC->adjSource() : eGC->adjTarget();
}
PlanarAugmentationFix augmenter;
augmenter.call(GC);
} else {
adjExternal = 0;
// augment graph planar biconnected
m_augmenter.get().call(GC);
// embed augmented graph
m_embedder.get().call(GC,adjExternal);
}
// compute shelling order with shelling order module
m_computeOrder.get().baseRatio(m_baseRatio);
ShellingOrder order;
m_computeOrder.get().callLeftmost(GC,order,adjExternal);
// compute grid coordinates for GC
NodeArray<int> x(GC), y(GC);
computeCoordinates(GC,order,x,y);
boundingBox.m_x = x[order(1,order.len(1))];
boundingBox.m_y = 0;
node v;
forall_nodes(v,GC)
if(y[v] > boundingBox.m_y) boundingBox.m_y = y[v];
// copy coordinates from GC to G
forall_nodes(v,G) {
node vCopy = GC.copy(v);
gridLayout.x(v) = x[vCopy];
gridLayout.y(v) = y[vCopy];
}