53 lines
1.0 KiB
Python
53 lines
1.0 KiB
Python
#!/usr/bin/env python3
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import math
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class Vertex():
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post=None
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pre=None
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def __init__(self,_x,_y):
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self.x=_x
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self.y=_y
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def __sub__(self,r):
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return Vertex(self.x-r.x,self.y-r.y)
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def __str__(self):
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return "("+str(self.x)+","+str(self.y)+")"
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def __repr__(self):
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return "("+str(self.x)+","+str(self.y)+")"
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def __eq__(self,p):
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return (self.x==p.x) and (self.y==p.y)
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def __add__(self,p):
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return Vertex(self.x+p.x,self.y+p.y)
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#inner product
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def dot(self,p):
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return self.x*p.x+self.y*p.y
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def cross(self,p):
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return self.x*p.y-self.y*p.x
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def length(self):
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return math.hypot(self.x,self.y)
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def rotate(self,radian):
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originalX=self.x
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self.x=self.x*math.cos(radian)-self.y*math.sin(radian)
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self.y=originalX*math.sin(radian)+self.y*math.cos(radian)
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def set(self,_x,_y):
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self.x=_x
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self.y=_y
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def set(self,p):
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self.x=p.x
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self.y=p.y
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#SVG for output
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def toSVG(self):
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return str(self.x)+","+str(self.y)
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