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); }