Matt's examples
diff --git a/Demo/tkinter/matt/canvas-gridding.py b/Demo/tkinter/matt/canvas-gridding.py
new file mode 100644
index 0000000..3524084
--- /dev/null
+++ b/Demo/tkinter/matt/canvas-gridding.py
@@ -0,0 +1,60 @@
+from Tkinter import *
+
+# this is the same as simple-demo-1.py, but uses
+# subclassing.
+# note that there is no explicit call to start Tk.
+# Tkinter is smart enough to start the system if it's not already going.
+
+class Test(Frame):
+ def printit(self):
+ print "hi"
+
+ def createWidgets(self):
+ self.QUIT = Button(self, {'text': 'QUIT',
+ 'bg': 'red',
+ 'fg': 'white',
+ 'height' : 3,
+ 'command': self.quit})
+ self.QUIT.pack({'side': 'bottom', 'fill': 'both'})
+
+ self.canvasObject = Canvas(self, {"width" : "5i", "height" : "5i"})
+ self.canvasObject.pack({'side': 'left'})
+
+ def mouseDown(self, event):
+ # canvas x and y take the screen coords from the event and translate
+ # them into the coordinate system of the canvas object
+ self.startx = self.canvasObject.canvasx(event.x, self.griddingSize)
+ self.starty = self.canvasObject.canvasy(event.y, self.griddingSize)
+
+ def mouseMotion(self, event):
+ # canvas x and y take the screen coords from the event and translate
+ # them into the coordinate system of the canvas object
+ x = self.canvasObject.canvasx(event.x, self.griddingsize)
+ y = self.canvasObject.canvasy(event.y, self.griddingsize)
+
+ if (self.startx != event.x) and (self.starty != event.y) :
+ self.canvasObject.delete(self.rubberbandBox)
+ self.rubberbandBox = self.canvasObject.create_rectangle(self.startx, self.starty, x, y)
+ # this flushes the output, making sure that
+ # the rectangle makes it to the screen
+ # before the next event is handled
+ self.update_idletasks()
+
+ def __init__(self, master=None):
+ Frame.__init__(self, master)
+ Pack.config(self)
+ self.createWidgets()
+
+ # this is a "tagOrId" for the rectangle we draw on the canvas
+ self.rubberbandBox = None
+
+ # this is the size of the gridding squares
+ self.griddingSize = 50
+
+ Widget.bind(self.canvasObject, "<Button-1>", self.mouseDown)
+ Widget.bind(self.canvasObject, "<Button1-Motion>", self.mouseMotion)
+
+
+test = Test()
+
+test.mainloop()