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"""
This page is in the table of contents.
Zoom in is a mouse tool to zoom in the display at the point where the mouse was clicked, increasing the scale by a factor of two.
"""
from __future__ import absolute_import
#Init has to be imported first because it has code to workaround the python bug where relative imports don't work if the module is imported as a main module.
import __init__
from skeinforge_tools.analyze_plugins.analyze_utilities.mouse_tool_base import MouseToolBase
from skeinforge_tools.skeinforge_utilities import settings
__author__ = "Enrique Perez (perez_enrique@yahoo.com)"
__date__ = "$Date: 2008/21/04 $"
__license__ = "GPL 3.0"
def getNewMouseTool():
"Get a new mouse tool."
return ZoomIn()
class ZoomIn( MouseToolBase ):
"The zoom in mouse tool."
def button1( self, event, shift = False ):
"Print line text and connection line."
scaleSetting = self.window.repository.scale
scaleSetting.value *= self.getMultiplier()
delta = complex( float( event.x ) / float( self.window.screenSize.real ), float( event.y ) / float( self.window.screenSize.imag ) ) - self.window.canvasScreenCenter
delta *= 1.0 - 1.0 / self.getMultiplier()
scrollPaneCenter = self.window.getScrollPaneCenter() + delta
self.window.updateNewDestroyOld( scrollPaneCenter )
def click( self, event = None ):
"Set the window mouse tool to this."
self.window.destroyMouseToolRaiseMouseButtons()
self.window.mouseTool = self
self.mouseButton[ 'relief' ] = settings.Tkinter.SUNKEN
def getReset( self, window ):
"Reset the mouse tool to default."
self.setWindowItems( window )
self.mouseButton = None
return self
def getMultiplier( self ):
"Get the scale multiplier."
return 2.0
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