def set_resistance(r):
"""
Sets the resistance of this resistor to be the string |r|, after
appropriately modifying it.
"""
if not r:
self.board.display_message('No resistance entered', ERROR)
return
try:
old_r = self.get_resistance()
new_r = resistance_to_string(resistance_from_string(r))
do = lambda: _set_resistance(new_r)
undo = lambda: _set_resistance(old_r)
do()
self.board.set_changed(True, Action(do, undo, 'set_resistance'))
except Exception as e:
self.board.display_message(e.message, ERROR)
def draw_on(self, canvas, offset=(0, 0)):
ox, oy = offset
w, h = self.width, self.height
self._resistor_zig_zags = draw_resistor_zig_zags(canvas, ox, oy, w, h)
self.parts |= self._resistor_zig_zags
text = resistance_to_string(resistance_from_string(self.init_resistance))
if w > h: # horizontal
self.resistor_text = canvas.create_text(ox + w / 2,
oy - RESISTOR_TEXT_PADDING, text=text, font=FONT)
else: # vertical
self.resistor_text = canvas.create_text(ox + w + RESISTOR_TEXT_PADDING +
8, oy + h / 2, text=text, font=FONT)
self.parts.add(self.resistor_text)
def get_resistance():
"""
Returns the string representing this resistor's resistance.
"""
return canvas.itemcget(self.resistor_text, 'text')
self.get_resistance = get_resistance
def _set_resistance(r):
canvas.itemconfig(self.resistor_text, text=r)
self.init_resistance = r
def set_resistance(r):
"""
Sets the resistance of this resistor to be the string |r|, after
appropriately modifying it.
"""
if not r:
self.board.display_message('No resistance entered', ERROR)
return
try:
old_r = self.get_resistance()
new_r = resistance_to_string(resistance_from_string(r))
do = lambda: _set_resistance(new_r)
undo = lambda: _set_resistance(old_r)
do()
self.board.set_changed(True, Action(do, undo, 'set_resistance'))
except Exception as e:
self.board.display_message(e.message, ERROR)
self.set_resistance = set_resistance