Hi,

You could handle the drawLink event to draw the label where you want it, or use a text-only node attached to the link to act as link label. The latter option lets you control the text position by setting the node's Bounds, and also the users will be able to move labels to any position they like:

ShapeNode label = diagram.getFactory().createShapeNode(rectNearTheLink);
label.attachTo(link, ...);
label.setTransparent(true);
label.setText("...");
label.setIgnoreLayout(true);
//label.setLocked(true); 

I hope that helps,
Stoyan

In the general case, set it at the middle of the link, e.g. at the middle control point. Then if getCommonLinks() finds more than one link between the same nodes, you can call resizeToFitText for all labels, sort them by Y, and pull them apart by setting Y for each next node to be at some distance below the previous node.

For that matter, instead of custom drawing or label nodes, you could pull the common links further apart by measuring their text via Diagram.measureString and leaving as much distance between adjacent links. I.e. modify the pairOffset value from diagram_LinkCreated to be big enough for the text, instead of fixed 5 millimeters.

I hope that helps,
Stoyan

When I use LinkTextStyle.Center, is it possible to get the exact place where the text is placed on the link and than to shift it if necessary?
It can help me a lot if I can move the text by the line

Thanks for your answer, I hope you understand what I mean

Michal

Hi,

I have one more simple idea. Is it possible to use text wrapping on a text that is attached to a line? (I use DiagramLink.setText and LinkTextStyle.Center). Some of my texts are very long and this can solve the problem easily, I hope

Thanks for your help

Michal

We are going to combine this with another feature request we have for jdiagram - displaying multiple labels on links. You could try this preview version:
https://mindfusion.eu/_beta/jdiag_labels.zip

Now you can call link.addLabel() to add a standard LinkLabel object, or link.addLabel(label) to add a derived one, e.g.:

LinkLabel label = link.addLabel(veryLongString);
label.setEnableWrap(true);
label.setMaxWidth(30);
label.setHorizontalAlign(Align.Center); 

If you derive from LinkLabel, you could override its draw method to decide where to draw the text in runtime.

The LinkLabel class now provides methods for associating the label with a specific control point or segment, and if you pass a negative value that's counted as a point or segment in destination to origin direction. We'll also try to implement some dynamic layout for the official release, so that labels avoid overlapping nodes and other labels.

I hope that helps,
Stoyan