import drawsvg as draw
import math
import random


class Circle:
    def __init__(self, length=1000, height=1000, radius=10, distance=60, offset=30):
        # run validations
        assert length >= 0, "length can not be negative"
        assert radius >= 0, "radius can not be negative"
        assert distance >= 2*radius, "distance must be grater den two times the radius"

        # Assign to self object
        self.__length = length
        self.__height = height
        self.__radius = radius
        self.__distance = distance
        self.__offset = offset

    def circle_generation(self):

        x1 = 10
        y1 = 10
        y = y1
        v = 1
        g = 1

        canvas = draw.Drawing(self.__length, self.__height, origin=(0, 0))

        while y <= self.__height:
            x = x1 + self.__offset * v
            while x <= self.__length:
                canvas.append(draw.Circle(x, y, self.__radius,
                                          fill='none', stroke_width=1, stroke='black'))
                x = x + self.__distance
            y = y + self.__distance
            v = -((1 - g) / 2)
            g = -g

        canvas.save_svg('example.svg')


if __name__ == '__main__':
    circle = Circle()
    circle.circle_generation()