Demo/tkinter/matt/printing-coords-of-items.py

   1 from Tkinter import *
   2
   3 # this file demonstrates the creation of widgets as part of a canvas object
   4
   5 class Test(Frame):
   6     ###################################################################
   7     ###### Event callbacks for THE CANVAS (not the stuff drawn on it)
   8     ###################################################################
   9     def mouseDown(self, event):
  10         # see if we're inside a dot. If we are, it
  11         # gets tagged as "current" for free by tk.
  12
  13         if not event.widget.find_withtag("current"):
  14             # there is no dot here, so we can make one,
  15             # and bind some interesting behavior to it.
  16             # ------
  17
  18             # create a dot, and mark it as current
  19             fred = self.draw.create_oval(event.x - 10, event.y -10, event.x +10, event.y + 10,
  20                                          {"fill" : "green", "tag" : "current"})
  21
  22             self.draw.bind(fred, "<Any-Enter>", self.mouseEnter)
  23             self.draw.bind(fred, "<Any-Leave>", self.mouseLeave)
  24
  25         self.lastx = event.x
  26         self.lasty = event.y
  27
  28
  29     def mouseMove(self, event):
  30         self.draw.move("current", event.x - self.lastx, event.y - self.lasty)
  31         self.lastx = event.x
  32         self.lasty = event.y
  33
  34     ###################################################################
  35     ###### Event callbacks for canvas ITEMS (stuff drawn on the canvas)
  36     ###################################################################
  37     def mouseEnter(self, event):
  38         # the "current" tag is applied to the object the cursor is over.
  39         # this happens automatically.
  40         self.draw.itemconfig("current", {"fill" : "red"})
  41         print self.tk.splitlist(self.draw.coords("current"))
  42
  43     def mouseLeave(self, event):
  44         # the "current" tag is applied to the object the cursor is over.
  45         # this happens automatically.
  46         self.draw.itemconfig("current", {"fill" : "blue"})
  47
  48     def createWidgets(self):
  49         self.QUIT = Button(self, {'text': 'QUIT',
  50                                   'fg': 'red',
  51                                   'command': self.quit})
  52         self.QUIT.pack({'side': 'left', 'fill': 'both'})
  53         self.draw = Canvas(self, {"width" : "5i", "height" : "5i"})
  54         self.draw.pack({'side': 'left'})
  55
  56
  57         Widget.bind(self.draw, "<1>", self.mouseDown)
  58         Widget.bind(self.draw, "<B1-Motion>", self.mouseMove)
  59
  60     def __init__(self, master=None):
  61         Frame.__init__(self, master)
  62         Pack.config(self)
  63         self.createWidgets()
  64
  65 test = Test()
  66 test.mainloop()
  67
  68
  69