Revision: 8100
http://matplotlib.svn.sourceforge.net/matplotlib/?rev=8100&view=rev
Author: jdh2358
Date: 2010-01-28 21:46:12 +0000 (Thu, 28 Jan 2010)
Log Message:
-----------
added drabbable state to legend -- thanks Adam Fraser
Modified Paths:
--------------
trunk/matplotlib/lib/matplotlib/legend.py
Modified: trunk/matplotlib/lib/matplotlib/legend.py
===================================================================
--- trunk/matplotlib/lib/matplotlib/legend.py 2010-01-28 20:37:46 UTC (rev
8099)
+++ trunk/matplotlib/lib/matplotlib/legend.py 2010-01-28 21:46:12 UTC (rev
8100)
@@ -38,6 +38,51 @@
from matplotlib.offsetbox import HPacker, VPacker, TextArea, DrawingArea
+class DraggableLegend:
+ """helper code for a draggable legend -- see Legend.draggable"""
+
+ def __init__(self, legend):
+ self.legend = legend
+ self.gotLegend = False
+
+ c1 = legend.figure.canvas.mpl_connect('motion_notify_event',
self.on_motion)
+ c2 = legend.figure.canvas.mpl_connect('pick_event', self.on_pick)
+ c3 = legend.figure.canvas.mpl_connect('button_release_event',
self.on_release)
+ legend.set_picker(self.my_legend_picker)
+ self.cids = [c1, c2, c3]
+
+ def on_motion(self, evt):
+ if self.gotLegend:
+ dx = evt.x - self.mouse_x
+ dy = evt.y - self.mouse_y
+ loc_in_canvas = self.legend_x + dx, self.legend_y + dy
+ loc_in_norm_axes =
self.legend.parent.transAxes.inverted().transform_point(loc_in_canvas)
+ self.legend._loc = tuple(loc_in_norm_axes)
+ self.legend.figure.canvas.draw()
+
+ def my_legend_picker(self, legend, evt):
+ return self.legend.legendPatch.contains(evt)
+
+ def on_pick(self, evt):
+ legend = self.legend
+ if evt.artist == legend:
+ bbox = self.legend.get_window_extent()
+ self.mouse_x = evt.mouseevent.x
+ self.mouse_y = evt.mouseevent.y
+ self.legend_x = bbox.xmin
+ self.legend_y = bbox.ymin
+ self.gotLegend = 1
+
+ def on_release(self, event):
+ if self.gotLegend:
+ self.gotLegend = False
+
+ def disconnect(self):
+ 'disconnect the callbacks'
+ for cid in self.cids:
+ self.legend.figure.canvas.mpl_disconnect(cid)
+
+
class Legend(Artist):
"""
Place a legend on the axes at location loc. Labels are a
@@ -182,7 +227,7 @@
self.texts = []
self.legendHandles = []
self._legend_title_box = None
-
+
localdict = locals()
for name in propnames:
@@ -284,7 +329,7 @@
# We use FancyBboxPatch to draw a legend frame. The location
# and size of the box will be updated during the drawing time.
-
+
self.legendPatch = FancyBboxPatch(
xy=(0.0, 0.0), width=1., height=1.,
facecolor=rcParams["axes.facecolor"],
@@ -316,6 +361,7 @@
self._last_fontsize_points = self._fontsize
+ self._draggable = None
def _set_artist_props(self, a):
"""
@@ -584,7 +630,7 @@
textbox = TextArea(lab, textprops=label_prop,
multilinebaseline=True, minimumdescent=True)
text_list.append(textbox._text)
-
+
labelboxes.append(textbox)
handlebox = DrawingArea(width=self.handlelength*fontsize,
@@ -597,7 +643,7 @@
handleboxes.append(handlebox)
- if len(handleboxes) > 0:
+ if len(handleboxes) > 0:
# We calculate number of lows in each column. The first
# (num_largecol) columns will have (nrows+1) rows, and remaing
@@ -613,7 +659,7 @@
[nrows] * num_smallcol)
else:
largecol, smallcol = [], []
-
+
handle_label = safezip(handleboxes, labelboxes)
columnbox = []
for i0, di in largecol+smallcol:
@@ -889,3 +935,16 @@
return ox, oy
+ def draggable(self):
+ """
+ toggle the draggable state; if on, you can drag the legend on
+ the canvas. The DraggableLegend helper class is returned
+ """
+ if self._draggable is not None:
+ self._draggable.disconnect()
+ self._draggable = None
+ else:
+
+ self._draggable = DraggableLegend(self)
+
+ return self._draggable
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