Points & Rectangles
A pair of classes to provide points and rectangles.
Surprisingly, I haven't been able to find a single Python module providing such primitive support.
WxPython supports wxPoint and wxRect, but it lacks many basic functions (such as, say, adding two points together to produce a third point..!)
This code is lacking a zillion essential features (but interpoint distance can now be calculated). I only put in the ones I needed immediately. Please add, refactor, optimize, rename stuff to be more standard, etc., as you see fit..!
If there's an actual, accessible, easy-to-include Python module, not tied to a graphics library, that does this stuff already, please write about it here! No sense in reinventing the wheel. I've looked, but haven't found one. Hence this.
1 # Code is Public Domain.
2
3 import math # required because of 'sqrt' in 'distanceTo' function.
4
5 def normalize(x1, y1, x2, y2):
6 return min(x1,x2), min(y1,y2), max(x1,x2), max(y1,y2)
7
8 class Point:
9 def __init__(self, x, y):
10 self.x = x
11 self.y = y
12 def __add__(self, other):
13 return Point(self.x+other.x, self.y+other.y)
14 def __sub__(self, other):
15 return Point(self.x-other.x, self.y-other.y)
16 def __mul__( self, scalar ):
17 return Point(self.x*scalar, self.y*scalar)
18 def __div__(self, scalar):
19 return Point(self.x/scalar, self.y/scalar)
20 def __str__(self):
21 return "(%s, %s)" % (self.x, self.y)
22 def __repr__(self):
23 return "%s(%r, %r)" % (self.__class__.__name__, self.x, self.y)
24 def XY(self):
25 return self.x,self.y
26 def Clone(self):
27 return Point(self.x, self.y)
28 def Integerize(self):
29 self.x = int(self.x)
30 self.y = int(self.y)
31 def Floatize(self):
32 self.x = float(self.x)
33 self.y = float(self.y)
34 def distanceTo(self,pt):
35 '''Distance between 2 points.'''
36 dy = self.y - pt.y
37 dx = self.x - pt.x
38 return sqrt(dy*dy + dx*dx)
39
40 class Rect:
41 def __init__(self, pt1, pt2):
42 self.Set(pt1, pt2)
43 def Contains(self, pt):
44 x,y = pt.XY()
45 return self.left <= x <= self.right and self.top <= y <= self.bottom
46 def Set( self, pt1, pt2 ):
47 extrema = normalize(pt1.x, pt1.y, pt2.x, pt2.y)
48 self.left, self.top, self.right, self.bottom = extrema
49 def Overlaps(self, other):
50 return (self.right > other.left and self.left < other.right
51 and self.top < other.bottom and self.bottom > other.top)
52 def GetTL(self):
53 return Point(self.left, self.top)
54 def GetBR(self):
55 return Point(self.right, self.bottom)
56 def ExpandedBy(self, n):
57 p1 = Point(self.left-n, self.top+n)
58 p2 = Point(self.right+n, self.bottom+n)
59 return Rect(p1, p2)
60 def TransformedByFunction(self, foo):
61 p1 = Point(self.left, self.top)
62 p2 = Point(self.right, self.bottom)
63 return Rect(foo(p1), foo(p2))
64 def __str__( self ):
65 return "<Rect (%s,%s)-(%s,%s)>" % (self.left,self.top,
66 self.right,self.bottom)
67 def __repr__(self):
68 return "%s(%r, %r)" % (self.__class__.__name__,
69 Point(self.left, self.top),
70 Point(self.right, self.bottom))