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---------- Forwarded message ----------
From: Anthony Floyd <[EMAIL PROTECTED]>
Date: Wed, Aug 6, 2008 at 12:28 PM
Subject: Re: [Matplotlib-users] Moving legend with mouse?
To: Søren Nielsen <[EMAIL PROTECTED]>
On Fri, Aug 1, 2008 at 6:10 AM, Søren Nielsen
<[EMAIL PROTECTED]> wrote:
>
> I'm using matplotlib 0.98 together with wxpython 2.8.8.0. It would be nice
> to be able to click on the legend and move it with the mouse. Is that
> possible? Is there a simple way to do this? Has anyone tried this or can
> someone point in the direction?
>
> Thanks,
> Soren
Hi Soren,
Sorry for the delay. This is pretty easy to do if you're using the API.
Our code is pretty ... um, integrated, so I can't provide you with a
detailed step-by-step, but here's the general idea:
- On a FigureCanvas, use mpl_connect to hook into the
'motion_notify_event'. So, we have
"self.mpl_connect('motion_notify_event', self._onMouseMove)"
- onMouseMove checks to see if we've previously picked the legend and
adds mplEvent.x and mplEvent.y to the original pick location and calls
our self._moveLegend function
- The _moveLegend routine is:
def _moveLegend(self, x, y, autoDraw=True):
height = float(self.figure.bbox.height())
width = float(self.figure.bbox.width())
dx = x/width
dy = y/height
self._legendLocation = (dx, dy)
self.plot.getLegend().setLocation(self._legendLocation)
self._legend._loc=(dx,dy)
if autoDraw:
self.draw()
Now, you won't need most of this, but the important things here are
the dx,dy calculations and the _legend._loc=(dx,dy) assignment.
It's not a very complete set of instructions, but it might get you
pointed in the right direction. Legend dragging in this manner works
quite smoothly for us.
Regards,
Anthony.
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