def __init__(self, master):
"""
This is the highest class in the hierarchy. It maintains a reference to the
main data structure that this GUI is manipulating. All other classes keep a reference to
their parent and can access the Truss via this class.
"""
self.master = master
# Instantiate data structure
self.truss = Truss()
# Graphics
self.frame = Frame(master, width=WINDOW_WIDTH, height=WINDOW_HEIGHT)
self.designSpace = DesignSpace(self)
#self.infoPane = InfoPane(self)
self.toolbar = Toolbar(self)
# Menu
TopMenu(self)
# Display
self.toolbar.frame.grid(row=0, column=0)
self.frame.pack()
# Event Binding
root.bind("<Control-g>", self.designSpace.toggleSnap)
# Current filename
self.fileName = None
