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a guest Apr 23rd, 2019 63 Never
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  1. this is my first gist
  2. import math        
  3. import turtle
  4.  
  5. def drawPhyllPattern(turtle, t, petalstart, angle = 137.508, size = 2, cspread = 4 ):
  6.     """print a pattern of circles using spiral phyllotactic data"""
  7.     # initialize position
  8.     # turtle.pen(outline=1, pencolor="black", fillcolor="orange")
  9.     turtle.color('black')
  10.     turtle.fillcolor("orange")
  11.     phi = angle * ( math.pi / 180.0 ) #we convert to radian
  12.     xcenter = 0.0
  13.     ycenter = 0.0
  14.      
  15.     # for loops iterate in this case from the first value until < 4, so
  16.     for n in range (0, t):
  17.         r = cspread * math.sqrt(n)
  18.         theta = n * phi
  19.          
  20.         x = r * math.cos(theta) + xcenter
  21.         y = r * math.sin(theta) + ycenter
  22.  
  23.         # move the turtle to that position and draw  
  24.         turtle.up()
  25.         turtle.setpos(x, y)
  26.         turtle.down()
  27.         # orient the turtle correctly
  28.         turtle.setheading(n * angle)
  29.         if n > petalstart-1:
  30.             turtle.color("yellow")
  31.             drawPetal(turtle, x, y)
  32.         else: turtle.stamp()
  33.              
  34.  
  35. def drawPetal(turtle, x, y ):
  36.     turtle.penup()
  37.     turtle.goto(x, y)
  38.     turtle.pendown()
  39.     turtle.color('black')
  40.     turtle.fillcolor('yellow')
  41.     turtle.begin_fill()
  42.     turtle.right(20)
  43.     turtle.forward(70)
  44.     turtle.left(40)
  45.     turtle.forward(70)
  46.     turtle.left(140)
  47.     turtle.forward(70)
  48.     turtle.left(40)
  49.     turtle.forward(70)
  50.     turtle.penup()
  51.     turtle.end_fill() # this is needed to complete the last petal
  52.  
  53.  
  54. gfg = turtle.Turtle()
  55. gfg.shape("turtle")
  56. gfg.speed(0) # make the turtle go as fast as possible
  57. drawPhyllPattern(gfg, 200, 160, 137.508 )
  58. gfg.penup()
  59. gfg.forward(1000)
  60. turtle.exitonclick()
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