On Tue, Jul 8, 2008 at 3:29 PM, Christopher Spears <<a href="mailto:cspears2002@yahoo.com">cspears2002@yahoo.com</a>> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
I have been reading everyone's comments on my line class. I have decided to implement some of the suggestions. Someone suggested that I create a Point.__cmp__ method. Here is what I have so far:<br>
<br>
def __cmp__(self, other):<br>
if self.x == other.x and self.y == other.y:<br>
return 0<br>
elif self.x < other.x and self.y < other.y:<br>
return -1<br>
elif self.x > other.x and self.y > other.y:<br>
return 1<br>
<br>
Figuring out the results for the above situations was easy. However, what should I do with the following situations:<br>
self.x > other.x and self.y < other.y<br>
self.x < other.x and self.y > other.y<br>
</blockquote><div><br>Sorry to jump in late - I missed the first part of the discussion - but what do you want to achieve with a Point.__cmp__ method? <br><br>Is it just to determine whether two points are identical - in which case I'd write it like so:<br>
def __cmp__(self, other):<br> if (self.x == other.x) and (self.y == other.y): <br>
return True<br> else:<br>
return False<br>
<br>
<br></div></div>Or are you trying to determine the slope of the line between two points, in which case I'd write it like this:<br>
def __cmp__(self, other):<br> if self.x == other.x:<br>
return False # points are identical, or one above the other - slope is undefined<br> else:<br> return (self.y - other.y) / (self.x - other.x) # rise over run<br>
<br>or... or... or... First decide what you want out of it, then write the function/method to give you the result you want.<br>
<br>-- <br><a href="http://www.fsrtechnologies.com">www.fsrtechnologies.com</a>