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             # create a dot, and mark it as current
  18             fred = self.draw.create_oval(
  19                 event.x - 10, event.y -10, event.x +10, event.y + 10,
  20                 fill="green")
  21             self.draw.tag_bind(fred, "<Enter>", self.mouseEnter)
  22             self.draw.tag_bind(fred, "<Leave>", self.mouseLeave)
  23         self.lastx = event.x
  24         self.lasty = event.y
  25
  26     def mouseMove(self, event):
  27         self.draw.move(CURRENT, event.x - self.lastx, event.y - self.lasty)
  28         self.lastx = event.x
  29         self.lasty = event.y
  30
  31     ###################################################################
  32     ###### Event callbacks for canvas ITEMS (stuff drawn on the canvas)
  33     ###################################################################
  34     def mouseEnter(self, event):
  35         # the "current" tag is applied to the object the cursor is over.
  36         # this happens automatically.
  37         self.draw.itemconfig(CURRENT, fill="red")
  38         print self.draw.coords(CURRENT)
  39
  40     def mouseLeave(self, event):
  41         # the "current" tag is applied to the object the cursor is over.
  42         # this happens automatically.
  43         self.draw.itemconfig(CURRENT, fill="blue")
  44
  45     def createWidgets(self):
  46         self.QUIT = Button(self, text='QUIT', foreground='red',
  47                            command=self.quit)
  48         self.QUIT.pack(side=LEFT, fill=BOTH)
  49         self.draw = Canvas(self, width="5i", height="5i")
  50         self.draw.pack(side=LEFT)
  51
  52         Widget.bind(self.draw, "<1>", self.mouseDown)
  53         Widget.bind(self.draw, "<B1-Motion>", self.mouseMove)
  54
  55     def __init__(self, master=None):
  56         Frame.__init__(self, master)
  57         Pack.config(self)
  58         self.createWidgets()
  59
  60 test = Test()
  61 test.mainloop()
  62
  63
  64