public Component prepareRenderer(
RenderContext<V, E> rc,
EdgeLabelRenderer graphLabelRenderer,
Object value,
boolean isSelected,
E edge) {
return rc.getEdgeLabelRenderer()
.<E>getEdgeLabelRendererComponent(
rc.getScreenDevice(),
value,
rc.getEdgeFontTransformer().transform(edge),
isSelected,
edge);
}
@Override
public void labelEdge(RenderContext<V, E> rc, Layout<V, E> layout, E e, String label) {
if (label == null || label.length() == 0) {
return;
}
Graph<V, E> graph = layout.getGraph();
// don't draw edge if either incident vertex is not drawn
Pair<V> endpoints = graph.getEndpoints(e);
V v1 = endpoints.getFirst();
V v2 = endpoints.getSecond();
if (!rc.getVertexIncludePredicate().evaluate(Context.<Graph<V, E>, V>getInstance(graph, v1))
|| !rc.getVertexIncludePredicate()
.evaluate(Context.<Graph<V, E>, V>getInstance(graph, v2))) {
return;
}
Point2D p1 = layout.transform(v1);
Point2D p2 = layout.transform(v2);
p1 = rc.getMultiLayerTransformer().transform(Layer.LAYOUT, p1);
p2 = rc.getMultiLayerTransformer().transform(Layer.LAYOUT, p2);
float x1 = (float) p1.getX();
float y1 = (float) p1.getY();
float x2 = (float) p2.getX();
float y2 = (float) p2.getY();
GraphicsDecorator g = rc.getGraphicsContext();
float distX = x2 - x1;
float distY = y2 - y1;
double totalLength = Math.sqrt(distX * distX + distY * distY);
double closeness =
rc.getEdgeLabelClosenessTransformer()
.transform(Context.<Graph<V, E>, E>getInstance(graph, e))
.doubleValue();
int posX = (int) (x1 + (closeness) * distX);
int posY = (int) (y1 + (closeness) * distY);
int xDisplacement = 0;
int yDisplacement = 0;
/*
* BUG 1: change X and Y in distXXX xDisplacement = (int) (rc.getLabelOffset() * (distY /
* totalLength)); yDisplacement = (int) (rc.getLabelOffset() * (-distX / totalLength));
*/
xDisplacement = (int) (rc.getLabelOffset() * (distX / totalLength));
yDisplacement = (int) (rc.getLabelOffset() * (-distY / totalLength));
// BUG 2
/*
* Component component = prepareRenderer(rc, rc.getEdgeLabelRenderer(), label,
* rc.getPickedEdgeState().isPicked(e), e); Dimension d = component.getPreferredSize();
* Shape edgeShape = rc.getEdgeShapeTransformer().transform(Context.<Graph<V, E>, E>
* getInstance(graph, e)); double parallelOffset = 1;
*
* parallelOffset -= rc.getParallelEdgeIndexFunction().getIndex(graph, e);
*
* if (edgeShape instanceof Ellipse2D) { parallelOffset +=
* edgeShape.getBounds().getHeight(); parallelOffset = -parallelOffset; }
*
* parallelOffset *= d.height;
*/
AffineTransform old = g.getTransform();
AffineTransform xform = new AffineTransform(old);
xform.translate(posX + xDisplacement, posY + yDisplacement);
// BUG 3
/*
* double dx = x2 - x1; double dy = y2 - y1; if
* (rc.getEdgeLabelRenderer().isRotateEdgeLabels()) { double theta = Math.atan2(dy, dx); if
* (dx < 0) { theta += Math.PI; } xform.rotate(theta); } if (dx < 0) { parallelOffset =
* -parallelOffset; }
*/
double parallelOffset = 0.0d;
Component component =
prepareRenderer(
rc, rc.getEdgeLabelRenderer(), label, rc.getPickedEdgeState().isPicked(e), e);
Dimension d = component.getPreferredSize();
xform.translate(-d.width / 2.0d, -(d.height / 2.0d - parallelOffset));
g.setTransform(xform);
g.draw(component, rc.getRendererPane(), 0, 0, d.width, d.height, true);
g.setTransform(old);
}