/**
* Inserts a given Relation in a graph
*
* @param graph the graph as target for insertion
* @param relation the relation that should be inserted
* @param verticalOffset the vertical offset of the relation
* @return the mxCell representing the Relation
*/
private Object insertRelation(mxGraph graph, RelationSchema relation, int verticalOffset) {
int attributeOffset;
int horizontalOffset = 0;
ArrayList<mxCell> attributeCells = new ArrayList<>();
mxCell relationVertex =
(mxCell)
graph.insertVertex(
parentPane,
relation.getName(),
relation,
horizontalOffset,
verticalOffset,
15 * relation.getName().length(),
25,
"RELATION_HEADER");
attributeOffset = (int) (relationVertex.getGeometry().getY() + 25);
// Add attributes
for (Attribute attr : relation.getAttributes()) {
attributeCells.add(
(mxCell)
graph.insertVertex(
parentPane,
attr.getName(),
attr,
horizontalOffset,
attributeOffset,
30,
25,
super.getAttributeStyle(attr, getImageSizeClass(attr))));
graph.updateCellSize(attributeCells.get(attributeCells.size() - 1));
horizontalOffset += 30;
}
double currentXPos = 0;
for (int i = 0; i < attributeCells.size(); i++) {
mxGeometry geo = attributeCells.get(i).getGeometry();
if (i > 0) {
currentXPos += attributeCells.get(i - 1).getGeometry().getWidth();
geo.setX(currentXPos);
}
geo.setHeight(25);
geo.setWidth(geo.getWidth() + 5);
}
drawFunctionalDependencies(
relation.getAttributes(), attributeCells, relation.getFunctionalDependencies());
return relationVertex;
}
/** Displays all relations with their functional dependencies */
private void display() {
int offset = 5;
mxCell relationCell;
removeAllRelations();
for (RelationSchema relation : dbRelations) {
relationCell = (mxCell) insertRelation(graph, relation, offset);
offset +=
relationCell.getGeometry().getHeight()
+ (50 + 30 * relation.getFunctionalDependencies().size());
}
}
