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Viewing changes to enthought/chaco/tools/tracking_pan_tool.py

  • Committer: Bazaar Package Importer
  • Author(s): Varun Hiremath
  • Date: 2011-07-08 20:38:02 UTC
  • mfrom: (7.2.3 sid)
  • Revision ID: james.westby@ubuntu.com-20110708203802-5t32e0ldv441yh90
Tags: 4.0.0-1
http://bugs.debian.org/633604
* New upstream release
* debian/control:
  - Depend on python-traitsui (Closes: #633604)
  - Bump Standards-Version to 3.9.2
* Update debian/watch file
* Remove debian/patches/* -- no longer needed

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enthought/chaco/tools/tracking_pan_tool.py
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""" Defines the TrackingPanTool class.
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"""
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# Chaco imports
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from enthought.chaco.tools.api import PanTool
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class TrackingPanTool(PanTool):
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    """ Allows the user to pan around a plot.
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    The user clicks a mouse button and drags to pan; the tool then returns to
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    a tracking state. 
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    """
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    def _end_pan(self, event):
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        plot = self.component
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        xrange = plot.x_mapper.range
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        yrange = plot.y_mapper.range
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        if not self.constrain or self.constrain_direction == "x":
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            high = xrange.high
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            low = xrange.low
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            if xrange.default_state == 'low_track':
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                hi_val = max([source.get_bounds()[1] for source in xrange.sources])
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                if hi_val >= low and hi_val <= high:
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                    xrange.set_bounds('track','auto')
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            elif xrange.default_state == 'high_track':
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                lo_val = min([source.get_bounds()[0] for source in xrange.sources])
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                if lo_val >= low and lo_val <= high:
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                    xrange.set_bounds('auto','track')
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        if not self.constrain or self.constrain_direction == "y":
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            high = yrange.high
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            low = yrange.low
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            if yrange.default_state == 'low_track':
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                hi_val = max([source.get_bounds()[1] for source in yrange.sources])
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                if hi_val >= low and hi_val <= high:
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                    yrange.set_bounds('track','auto')
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            elif yrange.default_state == 'high_track':
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                lo_val = min([source.get_bounds()[0] for source in yrange.sources])
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                if lo_val >= low and lo_val <= high:
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                    yrange.set_bounds('auto','track')
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        if self._auto_constrain:
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            self.constrain = False
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            self.constrain_direction = None
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        self.event_state = "normal"
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        event.window.set_pointer("arrow")
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        if event.window.mouse_owner == self:
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            event.window.set_mouse_owner(None)
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        event.handled = True
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        return
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# EOF