Add and move/re-locate annotation

[Mike Watts]

I want to add an annotation ( maybe with a pointer ) but I can imagine a user wanting to 'drag' the annotation to finely position it. Anyone tried doing this?

[skunk]

The problem is that, as delivered, Annotations are immutable. So you will need to cut and paste some code to achieve what you want.

But it does work

[david.gilbert]

Initially, I made annotations immutable because I didn't want the overhead of event listeners to notify the chart whenever an annotation changes, in order to trigger the automatic chart repainting.

You'll notice that now the classes aren't really immutable (you can modify some attributes), but there is also still no event notification. This needs tidying up. Perhaps adding event notification, and allowing annotations to be completely modifiable makes sense. It would certainly make it easier to implement more complex annotations (for instance, an entire chart could be added in one corner of a larger chart, as an annotation).

[paradoxoff]

I have uploaded a patch to add the (still missing) event handling code for annotations (artifact id 2809117).