/**
* Draws the arrows between the nodes
*
* @param attributes the attributes of the relation
* @param fd the functionalDependency to display
* @param nearNodes the Array of Nodes which are closer to the attribute-Nodes
* @param farNodes the Array of Nodes which are further away of the attribute-Nodes
*/
private void drawAttributeArrows(
ArrayList<Attribute> attributes,
FunctionalDependency fd,
ArrayList<mxCell> nearNodes,
ArrayList<mxCell> farNodes) {
int index;
ArrayList<Integer> indices = new ArrayList<>();
// draw arrows for the SourceAttributes
for (Attribute sourceAttr : fd.getSourceAttributes()) {
index = attributes.indexOf(sourceAttr);
graph.insertEdge(
parentPane, null, fd, nearNodes.get(index), farNodes.get(index), "EDGE_PLAIN");
indices.add(index);
}
// draw arrows for the TargetAttributes
for (Attribute targetAttr : fd.getTargetAttributes()) {
index = attributes.indexOf(targetAttr);
graph.insertEdge(
parentPane, null, fd, farNodes.get(index), nearNodes.get(index), "EDGE_ARROW");
indices.add(index);
}
// Connect arrows
java.util.Collections.sort(indices);
graph.insertEdge(
parentPane,
null,
fd,
farNodes.get(indices.get(0)),
farNodes.get(indices.get(indices.size() - 1)),
"EDGE_PLAIN");
}
