#!/usr/bin/python
# -*- coding: utf-8 -*-

# http://stackoverflow.com/questions/8997099/algorithm-to-generate-random-2d-polygon

import os, glob, errno
import math, random
from PIL import Image, ImageDraw
import svgwrite

def generatePolygon( ctrX, ctrY, aveRadius, irregularity, spikeyness, numVerts ) :
   '''Start with the centre of the polygon at ctrX, ctrY,
    then creates the polygon by sampling points on a circle around the centre.
    Randon noise is added by varying the angular spacing between sequential points,
    and by varying the radial distance of each point from the centre.

    Params:
    ctrX, ctrY - coordinates of the "centre" of the polygon
    aveRadius - in px, the average radius of this polygon, this roughly controls how large the polygon is, really only useful for order of magnitude.
    irregularity - [0,1] indicating how much variance there is in the angular spacing of vertices. [0,1] will map to [0, 2pi/numberOfVerts]
    spikeyness - [0,1] indicating how much variance there is in each vertex from the circle of radius aveRadius. [0,1] will map to [0, aveRadius]
    numVerts - self-explanatory

    Returns a list of vertices, in CCW order.
    '''

   irregularity = clip( irregularity, 0,1 ) * 2*math.pi / numVerts
   spikeyness = clip( spikeyness, 0,1 ) * aveRadius

   # generate n angle steps
   angleSteps = []
   lower = (2*math.pi / numVerts) - irregularity
   upper = (2*math.pi / numVerts) + irregularity
   sum = 0
   for i in range(numVerts) :
      tmp = random.uniform(lower, upper)
      angleSteps.append( tmp )
      sum = sum + tmp

   # normalize the steps so that point 0 and point n+1 are the same
   k = sum / (2*math.pi)
   for i in range(numVerts) :
     angleSteps[i] = angleSteps[i] / k

   # now generate the points
   points = []
   angle = random.uniform(0, 2*math.pi)
   for i in range(numVerts) :
     r_i = clip( random.gauss(aveRadius, spikeyness), 0, 2*aveRadius )
     x = ctrX + r_i*math.cos(angle)
     y = ctrY + r_i*math.sin(angle)
     points.append( (int(x),int(y)) )

     angle = angle + angleSteps[i]

   return points

def clip(x, min, max) :
   if( min > max ) :  return x
   elif( x < min ) :  return min
   elif( x > max ) :  return max
   else :             return x

# create maps export folder
directory = "maps"
try:
   os.makedirs(directory)
except OSError as exception:
   if exception.errno != errno.EEXIST:
      raise
# remove old image
# os.chdir(directory)
# files=glob.glob('*')
# for filename in files:
#     os.unlink(filename)

for i in range(0, 1):

   verts = generatePolygon( ctrX=500, ctrY=500, aveRadius=300, irregularity=1, spikeyness=0.15, numVerts=13 )

   index = str(i) if i > 9 else '0'+str(i)

   #    ______    ________
   #   / ___/ |  / / ____/
   #   \__ \| | / / / __
   #  ___/ /| |/ / /_/ /
   # /____/ |___/\____/

   svg = svgwrite.Drawing(filename = directory+"/map"+index+".svg",size = ("1000px", "1000px"))

   print(len(verts))
   for v in range(0, len(verts)):
      print('---- '+str(v)+' ----')
      # p1 = verts[v]
      # p2 = verts[0] if v >= len(verts) else verts[v+1];
      # print(p1)
      # print(p2)
      # svg.add(svg.line(p1, p2))

   svg.save()


   #     __    _ __
   #    / /_  (_) /_____ ___  ____ _____
   #   / __ \/ / __/ __ `__ \/ __ `/ __ \
   #  / /_/ / / /_/ / / / / / /_/ / /_/ /
   # /_.___/_/\__/_/ /_/ /_/\__,_/ .___/
   #                            /_/
   # black = (0,0,0)
   # white=(255,255,255)
   # im = Image.new('RGB', (1000, 1000), white)
   # imPxAccess = im.load()
   # draw = ImageDraw.Draw(im)
   # tupVerts = list(map(tuple,verts))
   #
   # # either use .polygon(), if you want to fill the area with a solid colour
   # # draw.polygon( tupVerts, outline=black,fill=white )
   #
   # # or .line() if you want to control the line thickness, or use both methods together!
   # draw.line( tupVerts+[tupVerts[0]], width=1, fill=black )
   #
   # # im.show()
   # im.save(directory+'/map-'+str(index)+'.bmp')
   # # now you can save the image (im), or do whatever else you want with it.