blup/generators/checkerboard.py

#!/usr/bin/env python3

import sys
import random
import math
import argparse
import collections
import blup.frame
import blup.output
import blup.animation
import blup.writebml
import colorsys


WIDTH = 22
HEIGHT = 16
DEPTH = 256


class Point(collections.namedtuple('Point', ['x', 'y'])):
    def __add__(self, other):
        return Point(self.x + other.x, self.y + other.y)
    def __sub__(self, other):
        return Point(self.x - other.x, self.y - other.y)
    def __mul__(self, other):
        if isinstance(other, Point):
            raise Exception('not implemented')
        else:
            return Point(self.x * other, self.y * other)
    def __truediv__(self, other):
        if isinstance(other, Point):
            raise ValueError()
        else:
            return self * (1/other)
    @property
    def len(self):
        return math.sqrt(self.x**2 + self.y**2)
    @property
    def n(self):
        n = Point(self.y, -self.x)
        return n / n.len
    @property
    def intp(self):
        return Point(int(round(self.x)), int(round(self.y)))


def convert_color(c):
    return list(map(lambda x: int(round(x*(DEPTH-1))), c))


def get_random_color():
    return colorsys.hsv_to_rgb(random.random(), 0.5 + random.random() / 2, 1)


class BlinkingCheckerboard:
    def __init__(self, size, fieldsize, h, num_fields, rounds):
        self.size, self.fieldsize, self.h, self.num_fields, self.rounds = \
            size, fieldsize, h, num_fields, rounds
        self.roundtime = 0.5

        self.fieldpoints = [
            Point(random.randint(0, WIDTH-1), random.randint(0, HEIGHT-1))
        ]
        xm = self.fieldpoints[-1].x % (fieldsize * 2)
        ym = self.fieldpoints[-1].y % (fieldsize * 2)
        while len(self.fieldpoints) < self.num_fields:
            p = random.choice(self.fieldpoints)
            o = Point(random.randint(-2, 2), random.randint(-2, 2))
            if abs(o.x) + abs(o.y) != 2:
                continue
            p += o * fieldsize
            if p.x < 0 or p.y < 0 or p.x >= size.x or p.y > size.y:
                continue
            if p not in self.fieldpoints:
                self.fieldpoints.append(p)
        self.done = False

    def update(self, t, dt):
        r = t / self.roundtime
        if r >= self.rounds + 1:
            self.done = True
            self.fieldvals = [0] * self.num_fields
        else:
            self.fieldvals = []
            for i in range(self.num_fields):
                offs = i / (self.num_fields - 1) * 2 * math.pi
                pos = 2 * math.pi * r
                self.fieldvals.append(max(math.sin(offs + pos), 0))
                if r > self.rounds and r < self.rounds + 1:
                    if self.fieldvals[-1] < 0.01:
                        self.fieldvals[-1] = 0

    def draw(self, frame):
        for i, f in enumerate(self.fieldpoints):
            color = colorsys.hsv_to_rgb(self.h, 1, self.fieldvals[i])
            for x in range(self.fieldsize):
                for y in range(self.fieldsize):
                    try:
                        p = f + Point(x, y)
                        frame.setPixel(p.x, p.y, convert_color(color))
                    except ValueError:
                        pass


if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='Generate animations')
    parser.add_argument('-d', '--delay', type=int, default=50)
    parser.add_argument('-t', '--time', type=int, default=15)
    parser.add_argument('output_file')
    args = parser.parse_args()

    dim = blup.frame.FrameDimension(WIDTH, HEIGHT, DEPTH, 3)
    anim = blup.animation.Animation(dim)
    anim.tags['description'] = ' '.join(sys.argv)

    t = 0
    dt = args.delay / 1000
    tt = 0
    bc = None
    while t < args.time or not bc.done:
        t += dt
        tt += dt
        frame = blup.animation.AnimationFrame(dim, args.delay)

        if (bc is None or bc.done) and t < args.time:
            tt = 0
            bc = BlinkingCheckerboard(
                Point(WIDTH, HEIGHT),
                2,
                random.random(),
                random.randint(13, 23),
                random.randint(3, 5)
            )

        bc.update(tt, dt)
        bc.draw(frame)

        anim.addFrame(frame)

    blup.writebml.writeBml(anim, args.output_file)