reptX = abs(diffX) // pickUnits[0] # incr per move, number moves
reptY = abs(diffY) // pickUnits[0] # from last to event click
incrX = pickUnits[0] ((diffX > 0) or −1) # 3.x // trunc div required
incrY = pickUnits[0] ((diffY > 0) or −1)
return incrX, reptX, incrY, reptY
def onMove(self, event):
traceEvent('onMove', event, 0) # move current object to click
object = self.object # ignore some ops during mv
if object and object not in self.moving:
msecs = int(pickDelays[0] * 1000)
parms = 'Delay=%d msec, Units=%d' % (msecs, pickUnits[0])
self.setTextInfo(parms)
self.moving.append(object)
canvas = event.widget
incrX, reptX, incrY, reptY = self.plotMoves(event)
for i in range(reptX):
canvas.move(object, incrX, 0)
canvas.update()
time.sleep(pickDelays[0])
for i in range(reptY):
canvas.move(object, 0, incrY)
canvas.update() # update runs other ops
time.sleep(pickDelays[0]) # sleep until next move
self.moving.remove(object)
if self.object == object: self.where = event
def onSelect(self, event):
self.where = event
self.object = self.canvas.find_closest(event.x, event.y)[0] # tuple
def onDrag(self, event):
diffX = event.x - self.where.x # OK if object in moving
diffY = event.y - self.where.y # throws it off course
self.canvas.move(self.object, diffX, diffY)
self.where = event
def onOptions(self, event):
keymap = {
'w': lambda self: self.changeOption(pickWidths, 'Pen Width'),
'c': lambda self: self.changeOption(pickFills, 'Color'),
'u': lambda self: self.changeOption(pickUnits, 'Move Unit'),
's': lambda self: self.changeOption(pickDelays, 'Move Delay'),
'x': lambda self: self.changeOption(pickPens, 'Pen Mode'),
'o': lambda self: self.changeDraw(Canvas.create_oval, 'Oval'),
'r': lambda self: self.changeDraw(Canvas.create_rectangle, 'Rect'),
'l': lambda self: self.changeDraw(Canvas.create_line, 'Line'),
'a': lambda self: self.changeDraw(Canvas.create_arc, 'Arc'),
'd': MovingPics.deleteObject,
'1': MovingPics.raiseObject,
'2': MovingPics.lowerObject, # if only 1 call pattern
'f': MovingPics.fillObject, # use unbound method objects
'b': MovingPics.fillBackground, # else lambda passed self
'p': MovingPics.addPhotoItem,
'z': MovingPics.savePostscript,
742 | Chapter 11: Complete GUI Programs