from cs1graphics import *
from math import *

class Star(Polygon):
    def __init__(self,numRays=5,outerRadius=30,innerRatio=0.5,center=Point(30,30)):
        Polygon.__init__(self) # call the parent constructor
        
        top = Point(0,-outerRadius) # top point of the star
        print "Top point:",top
        angle = 360.0/(2*numRays) # angle between points
        print "Angle:",angle

        for i in range(numRays):
            self.addPoint(top^(angle*2*i)) # adding ray point
            #print i+1,'th ray point:',top^(angle*i)
            self.addPoint(innerRatio*top^(angle*(2*i+1))) # adding inner point
            #print i+1,'th inner point:',top^(angle*(i+0.5))
            
        self.adjustReference(0,outerRadius) # moving Reference Point from the
        #top point to the center of the star
        self.moveTo(center.getX(),center.getY())
        #self.move(100,100)
        #moving the star to the given by the user point (as the center of the star)
        self._innerRatio=innerRatio # record the inner ratio as attribute

    def setInnerRatio(self,newRatio):
        factor=newRatio/self._innerRatio
        self._innerRatio=newRatio

        #we will modify only inner points
        for i in range(1,self.getNumberOfPoints(),2):
            self.setPoint(factor*self.getPoint(i),i)

def main():
    paper=Canvas(400,600,'lightyellow','Stars')

    s=Star()
    paper.add(s)

    tt=raw_input('Press Enter to continue')
    
    s.setInnerRatio(0.2)

    s1=Star(8,40,0.3,Point(200,200))
    s1.setBorderColor('dark blue')
    s1.setFillColor('blue')

    paper.add(s1)
    

main()