#coding=utf-8

from math import sqrt,cos,sin
import Image, ImageDraw

class SpireShape(object):
    def __init__(self, draw):
        self.draw = draw
        self.line_width = 1
        self.line_color = (0,0,0)
        self.current_point = (0, 0)

    def setPoints(self,points):
        self.points = points

    def setLineWidth(self,line_width):
        self.line_width = line_width

    def setLineColor(self,line_color):
        self.line_color = line_color
   
    def moveto(self, p):
        self.current_point = p
   
    def lineto(self, p):
        self.draw.line((self.current_point, p), width=self.line_width, fill=self.line_color)
        self.current_point = p

    def point(self, p):
        self.draw.point(p,fill=self.line_color)
        self.current_point = p

    def spire(self, p, angle,rate):
        '''
        p is start point,angle is start angle,rate is scatter speed len/thita.
            '''
        r = 0;
        thita = 0;
        pi = 3.14
        du = 2*pi/360
        while r<=500.0:
            posX = r*cos(thita+angle*du)
            posY = r*sin(thita+angle*du)
           
            pSpare =(posX+p[0],posY+p[1])
            self.point(pSpare)

            r = r+thita*rate
            thita = thita+du

# 測試程式碼
if __name__ == '__main__':
    im = Image.new('RGBA', (1024,1024), (255,255,255))
    draw = ImageDraw.Draw(im)

    b = SpireShape(draw)
    point = (500,500)
    b.spire(point,0,0.2)
    #b.spire(point,90,0.2)
   
    del draw
    im.show()