René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Draggable legend results RuntimeError and AttributeError on Mac OS 10.8.1","articleBody":"Environment:\n- Python 2.7.3\n- Matplotlib 1.1.1\n- Max OS 10.8.1\n\nCode:\n\n``` python:\nIn [1]: import matplotlib.pyplot as plt\n\nIn [2]: plt.bar([1, 2, 3], [2, 3, 2], label='label')\nOut[2]: \n[\u003cmatplotlib.patches.Rectangle at 0x1043415d0\u003e,\n \u003cmatplotlib.patches.Rectangle at 0x104341650\u003e,\n \u003cmatplotlib.patches.Rectangle at 0x104341ad0\u003e]\n\nIn [3]: l = plt.legend()\n\nIn [4]: l.draggable()\nOut[4]: \u003cmatplotlib.legend.DraggableLegend at 0x10434fbd0\u003e\n```\n\nOnce I drag the legend, the following errors occurred. The same code works fine in Windows XP.\n\n```\n  File \"/Users/sin/Library/Python/2.7/lib/python/site-packages/matplotlib/offsetbox.py\", line 376, in get_extent_offsets\n    whd_list = [c.get_extent(renderer) for c in self.get_visible_children()]\n  File \"/Users/sin/Library/Python/2.7/lib/python/site-packages/matplotlib/offsetbox.py\", line 639, in get_extent\n    \"lp\", self._text._fontproperties, ismath=False)\n  File \"/Users/sin/Library/Python/2.7/lib/python/site-packages/matplotlib/backends/backend_macosx.py\", line 161, in get_text_width_height_descent\n    width, height, descent = self.gc.get_text_width_height_descent(unicode(s), family, size, weight, style)\nRuntimeError: CGContextRef is NULL\n```\n\n```\nTraceback (most recent call last):\n  File \"/Users/sin/Library/Python/2.7/lib/python/site-packages/matplotlib/backend_bases.py\", line 1588, in motion_notify_event\n    self.callbacks.process(s, event)\n  File \"/Users/sin/Library/Python/2.7/lib/python/site-packages/matplotlib/cbook.py\", line 262, in process\n    proxy(*args, **kwargs)\n  File \"/Users/sin/Library/Python/2.7/lib/python/site-packages/matplotlib/cbook.py\", line 188, in __call__\n    return mtd(*args, **kwargs)\n  File \"/Users/sin/Library/Python/2.7/lib/python/site-packages/matplotlib/offsetbox.py\", line 1434, in on_motion\n    self.update_offset(dx, dy)\n  File \"/Users/sin/Library/Python/2.7/lib/python/site-packages/matplotlib/offsetbox.py\", line 1504, in update_offset\n    loc_in_canvas = self.offsetbox_x + dx, self.offsetbox_y + dy\nAttributeError: 'DraggableLegend' object has no attribute 'offsetbox_x'\n```\n","author":{"url":"https://github.com/sinhrks","@type":"Person","name":"sinhrks"},"datePublished":"2012-09-17T15:19:46.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":10},"url":"https://github.com/1266/matplotlib/issues/1266"}