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# Copyright 2008 Nanorex, Inc. See LICENSE file for details.
"""
Zoom in/out mode functionality.
@author: Mark Sims
@version: $Id$
@copyright: 2008 Nanorex, Inc. See LICENSE file for details.
@license: GPL
"""
from Numeric import exp
from temporary_commands.TemporaryCommand import TemporaryCommand_Overdrawing
# == GraphicsMode part
class ZoomInOutMode_GM( TemporaryCommand_Overdrawing.GraphicsMode_class ):
"""
Custom GraphicsMode for use as a component of ZoomInOutMode.
"""
def leftDown(self, event):
"""
Event handler for LMB press event.
@param event: A Qt mouse event.
@type event: U{B{QMouseEvent}<http://doc.trolltech.com/4/qmouseevent.html>}
"""
# Setup zoom operation
self.prevY = event.y()
return
def leftDrag(self, event):
"""
Event handler for LMB drag event.
@param event: A Qt mouse event.
@type event: U{B{QMouseEvent}<http://doc.trolltech.com/4/qmouseevent.html>}
"""
dScale = .025 # This works nicely. Mark 2008-01-29.
delta = self.prevY - event.y()
self.prevY = event.y()
factor = exp(dScale * delta)
#print "y, py =", event.y(), self.prevY, ", delta =", delta, ", factor=", factor
self.glpane.rescale_around_point(factor)
self.glpane.gl_update()
return
def update_cursor_for_no_MB(self): # Fixes bug 1638. Mark 3/12/2006.
"""
Update the cursor for 'Zoom In/Out' mode.
"""
self.glpane.setCursor(self.win.ZoomInOutCursor)
pass
# == Command part
class ZoomInOutMode(TemporaryCommand_Overdrawing):
"""
Encapsulates the Zoom In/Out functionality.
"""
# class constants
commandName = 'ZOOMINOUT'
featurename = "Zoom In/Out Tool"
from utilities.constants import CL_VIEW_CHANGE
command_level = CL_VIEW_CHANGE
GraphicsMode_class = ZoomInOutMode_GM
def command_enter_misc_actions(self):
"""
See superclass method for documentation
"""
self.win.zoomInOutAction.setChecked(True)
def command_exit_misc_actions(self):
"""
See superclass method for documentation
"""
self.win.zoomInOutAction.setChecked(False)
#END new command API methods==============================================
# end
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