/**
* Assignes the least crowded corner loopSide to the given components. The crowding will be
* recalculated after each added edge.
*
* @param components The components to assign a loopSide for.
*/
private void assignCornerSide(final List<ConnectedSelfLoopComponent> components) {
for (final ConnectedSelfLoopComponent component : components) {
final LoopSide side = loopSides.getLeastCrowdedCorner();
loopSides.addSize(side, component.getTextWidth(), component.getTextHeight());
component.setLoopSide(side, true);
}
}
/**
* Sets the loopSide of all self-loops of the component individually, depending on the side(s)
* already defined for at least one port in the component. At least one portSide must be defined,
* otherwise this method will run infinitely.
*
* @param component The connected component to process.
* @return The LoopSide that is equal to the assigned portSides. Undefined, if there is not a
* common side for all loops.
*/
private LoopSide setPortSideByConstraint(final ConnectedSelfLoopComponent component) {
// Iterator over the edges of the component.
// The iterator is cycling, as there is no guarantee, that (at least) one port of the current
// edge has a portSide defined. If both portSides of the current edge are UNDEFINED, we will
// return to it later.
final Iterator<LEdge> iter = Iterators.cycle(Lists.newArrayList(component.getEdges()));
// LoopSides in this component will be collected here
final EnumSet<LoopSide> loopSidesInComponent = EnumSet.noneOf(LoopSide.class);
while (iter.hasNext()) {
final LEdge edge = iter.next();
final PortSide sourceSide = edge.getSource().getSide();
final PortSide targetSide = edge.getTarget().getSide();
if (sourceSide == PortSide.UNDEFINED) {
// source side is undefined
if (targetSide != PortSide.UNDEFINED) {
// only targetSide is defined. Edge becomes a sideLoop on the side of target.
final LoopSide side = LoopSide.fromPortSides(targetSide);
edge.setProperty(InternalProperties.SPLINE_LOOPSIDE, side);
edge.getSource().setSide(targetSide);
loopSidesInComponent.add(side);
iter.remove();
}
} else {
// source side is defined
if (targetSide == PortSide.UNDEFINED) {
// only sourceSide is defined. Edge becomes a sideLoop on the side of source.
final LoopSide side = LoopSide.fromPortSides(sourceSide);
edge.setProperty(InternalProperties.SPLINE_LOOPSIDE, side);
edge.getTarget().setSide(sourceSide);
loopSidesInComponent.add(side);
iter.remove();
} else {
// both sides are defined, set edge side resulting from the combination
final LoopSide side = LoopSide.fromPortSide(sourceSide, targetSide);
edge.setProperty(InternalProperties.SPLINE_LOOPSIDE, side);
loopSidesInComponent.add(side);
iter.remove();
}
}
}
// Now all edges have a LoopSide assigned.
// Check if we can find a LoopSide for the whole component.
LoopSide side;
if (loopSidesInComponent.size() == 1) {
side = loopSidesInComponent.iterator().next();
} else {
side = LoopSide.UNDEFINED;
}
component.setLoopSide(side, false);
return side;
}
/**
* Distributes the self-loops equally around the node.
*
* @param components
*/
public void calculate(final List<ConnectedSelfLoopComponent> components) {
final List<ConnectedSelfLoopComponent> withLongText = Lists.newArrayList();
final List<ConnectedSelfLoopComponent> withShortText = Lists.newArrayList();
final List<ConnectedSelfLoopComponent> withoutText = Lists.newArrayList();
// first we are going to check for the size of possible edge labels
for (final ConnectedSelfLoopComponent component : components) {
if (component.getTextWidth() > MAX_TEXT_LENGTH) {
withLongText.add(component);
} else if (component.getTextWidth() > 0.0) {
withShortText.add(component);
} else {
withoutText.add(component);
}
}
// if there is only one loop with text, handle this loop as a long text loop
if (withShortText.size() == 1 && withLongText.isEmpty()) {
withLongText.addAll(withShortText);
withShortText.clear();
}
// try to put the components with long text to one of the horizontal across loop sides.
// if there are no such sides available, handle long text loops as short text loops.
if (!withLongText.isEmpty()
&& loopSides.availableSides().contains(LoopSide.N)
&& loopSides.availableSides().contains(LoopSide.S)) {
assignAcrossSide(withLongText);
} else {
withShortText.addAll(withLongText);
}
// put the components with short text to one of the corner loop sides
if (!withShortText.isEmpty()) {
assignCornerSide(withShortText);
}
// Last but not least: loops without text get spread equally.
if (!withoutText.isEmpty()) {
// ////////////////////////////////////////////////////////////
// First of all we try to put those ConnectedSelfLoops who have more than one edge,
// to one of the available straight sides.
// ////////////////////////////////////////////////////////////
final Set<LoopSide> availableStraights = loopSides.availableStraightSides();
if (!availableStraights.isEmpty()) {
final Iterator<ConnectedSelfLoopComponent> itrComponent = withoutText.iterator();
final Iterator<LoopSide> itrAvailable = Iterables.cycle(availableStraights).iterator();
while (itrComponent.hasNext()) {
// look for a component with more than one edge
ConnectedSelfLoopComponent component = itrComponent.next();
while (itrComponent.hasNext() && component.getEdges().size() < 2) {
component = itrComponent.next();
}
// If we have found a component with more than one edge, assign the next
// straight side to the component.
if (component.getEdges().size() > 1) {
final LoopSide side = itrAvailable.next();
component.setLoopSide(side, true);
itrComponent.remove();
loopSides.removeSide(side);
}
}
}
// ////////////////////////////////////////////////////////////
// Now we can distribute the remaining components around the node.
// ////////////////////////////////////////////////////////////
// number of required sides
final int number = withoutText.size();
// Center of the assigned pattern.
final LoopSide center = findCenter();
// The list of portSides we assign to the set of connected components.
final List<LoopSide> portSides = Lists.newArrayList();
// How many times must a "full set" of LoopSide-elements be constructed?
final int fullSets = number / loopSides.availableNotAcrossSides().size();
// Construct the full sets.
for (int i = 0; i < fullSets; i++) {
portSides.addAll(loopSides.availableNotAcrossSides());
}
// How many elements are remaining to be constructed after the full sets have been
// constructed?
int remainer = number % loopSides.availableNotAcrossSides().size();
// If more than three elements are remaining, the pattern includes all four corners
// and the sides that would be included in the pattern for (n-4) elements.
if (remainer > 3) {
portSides.addAll(LoopSide.getAllCornerSides());
remainer -= 4;
}
// Create the pattern for 1-3 elements.
switch (remainer) {
case 3:
// opposed side (from center) and the the same sides as for two elements
portSides.add(center.opposite());
case 2:
// the first AVAILABLE neighbors of the neighbors of the opposed side of the
// center
LoopSide tmpSide = center.opposite().left();
do {
tmpSide = tmpSide.left();
} while (!loopSides.availableSides().contains(tmpSide));
portSides.add(tmpSide);
tmpSide = center.opposite().right();
do {
tmpSide = tmpSide.right();
} while (!loopSides.availableSides().contains(tmpSide));
portSides.add(tmpSide);
break;
case 1:
// opposed side (from center)
portSides.add(center.opposite());
break;
default:
break;
}
// Now assign the remaining sides to the set of portSides we just have constructed.
final Iterator<LoopSide> itrSides = portSides.iterator();
final Iterator<ConnectedSelfLoopComponent> itrComponent = withoutText.iterator();
while (itrSides.hasNext() && itrComponent.hasNext()) {
itrComponent.next().setLoopSide(itrSides.next(), true);
}
}
}
/** {@inheritDoc} */
public void process(final LGraph layeredGraph, final IElkProgressMonitor monitor) {
monitor.begin("Spline SelfLoop positioning", 1);
/** Stores which loop placement strategy to choose. */
final SelfLoopPlacement loopPlacement =
layeredGraph.getProperty(Properties.SPLINE_SELF_LOOP_PLACEMENT);
////////////////////////////////////////////////////////
// There are two main jobs to be done:
// 1) Find a loop-side for each component.
// 2) Position ports in the correct order around the node.
////////////////////////////////////////////////////////
// Process all nodes on all layers.
for (final Layer layer : layeredGraph) {
for (final LNode node : layer) {
// Read self-loops components.
final List<ConnectedSelfLoopComponent> components =
node.getProperty(InternalProperties.SPLINE_SELFLOOP_COMPONENTS);
// Components to be distributed by the placement strategy.
final List<ConnectedSelfLoopComponent> componentsToBePlaced = Lists.newArrayList();
for (final ConnectedSelfLoopComponent component : components) {
// Re-Add all hidden edges to their ports.
component.unhideEdges();
if (component.getConstrainedPorts().isEmpty()) {
// If there is no constraint on any port, we have to process this component later
componentsToBePlaced.add(component);
} else {
// If there is at least one port with a constraint to it's port-side,
// we will set the port- and loop-sides by this constraint. (Job 1)
setPortSideByConstraint(component);
if (!component.getNonLoopPorts().isEmpty()) {
// Position and re-add all ports to the node, that are part of a component
// with at least one non-loop edge. (Job 2)
addComponentWithNonLoopEdges(component);
}
}
}
// Now we have to find a loop-side (job 1) for the remaining components. They are all
// stored in componentsToBePlaced. All these components don't have a port with a
// constraint on it's portSide, so we can arrange them accordingly to the cosen strategy.
switch (loopPlacement) {
case EQUALLY_DISTRIBUTED:
setPortSideSpreadEqually(componentsToBePlaced, node);
break;
case NORTH_SEQUENCE:
for (final ConnectedSelfLoopComponent component : componentsToBePlaced) {
component.setLoopSide(LoopSide.N, true);
}
break;
case NORTH_STACKED:
for (final ConnectedSelfLoopComponent component : componentsToBePlaced) {
component.setLoopSide(LoopSide.N, true);
}
break;
default:
// Unknown strategy chosen.
assert false;
break;
}
// Position and re-add all ports to the node.
// This is job 2)
switch (loopPlacement) {
case EQUALLY_DISTRIBUTED:
case NORTH_STACKED:
portStackedPositioning(components);
break;
case NORTH_SEQUENCE:
portLinedPositioning(components);
break;
default:
break;
}
}
}
monitor.done();
}