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"""Rendering classes and helper functions."""
from __future__ import division
import color
import random
import constants
from constants import *
import math
from show import Show
class ShootingStar(object):
"""Object displayed on the bridge, probably a fish."""
def __init__(self):
"""Create fish with default parameters."""
self.x = random.random() * BRIDGE_WIDTH
self.y = random.random() * 1.5
self.width = 5
self.height = 0.5
self.color = color.RGB(1, 1, 1)
if random.random() >= 0.5:
self.speed = 8
else:
self.speed = -8
def update(self):
self.x += self.speed
self.speed *= 0.9
return abs(self.speed) > 1 and self.x < BRIDGE_WIDTH
class Light(object):
"""Represent a bridge light and its state."""
def __init__(self, x, y, light):
"""Store all facts about a light."""
self.light = light
self.color = color.black
self.result_color = self.color
self.transitioning_to = self.color
self.step = 0
self.on = False
self.increasing = False
self.x = x
self.y = y
self.fade_step = 0
def update_base(self):
"""Change color depending on where the fish is."""
if not self.on and random.random() < 0.0005:
self.transitioning_to = color.RGB(1, 1, 1)
self.step = abs(self.transitioning_to - self.color) / (FRAME_RATE / 2)
self.increasing = True
self.on = True
self.color = transition(self.color, self.transitioning_to, self.step)
elif self.on:
if abs(self.transitioning_to - self.color) <= self.step:
if self.increasing == True:
self.transitioning_to = color.RGB(0, 0, 0)
self.step = abs(self.transitioning_to - self.color) / (FRAME_RATE / 2)
self.increasing = False
else:
self.increasing = False
self.on = False
self.color = transition(self.color, self.transitioning_to, self.step)
self.result_color = self.color
def update_star(self, star):
coverage = compute_coverage(star, self.x, self.y)
self.result_color = coverage * star.color + (1 - coverage) * self.result_color
def blit(self):
self.light.setRGBRaw(
*map(lambda x: clamp(0, x, 1), self.result_color.components)
)
def fade_to_black(self, steps):
hue = self.color.to_HSV().h()
sat = self.color.to_HSV().s()
value = self.color.to_HSV().v()
new_color = color.HSV(hue, sat, value - value / steps * self.fade_step).to_RGB()
self.fade_step += 1
self.light.setRGBRaw(*map(lambda x: clamp(0, x, 1), new_color.components))
class TwinkleShow(Show):
def init(self):
self.lights = [[Light(x, y, self.bridge.get_light(x, y))
for y in xrange(self.bridge.HEIGHT)]
for x in xrange(self.bridge.WIDTH)]
#self.sun = Sun()
self.stars = set()
self.tick_count = 0
def update(self):
if self.tick_count > FRAME_RATE * 90:
fade_time = 3 # sec
if self.tick_count > FRAME_RATE * 90 + fade_time * FRAME_RATE:
self.stop()
return
for col in self.lights:
for light in col:
light.fade_to_black(fade_time * FRAME_RATE)
else:
if random.random() < 0.01:
self.stars.add(ShootingStar())
for col in self.lights:
for light in col:
light.update_base()
for star in list(self.stars):
if not star.update():
self.stars.remove(star)
for x in xrange(int(star.x), int(star.x+star.width+1)):
if x < len(self.lights):
for light in self.lights[x]:
light.update_star(star)
for col in self.lights:
for light in col:
light.blit()
self.tick_count += 1
def compute_coverage(fish, x, y):
"""Calculate the coverage of a fish over a box."""
middle_of_fish = fish.x + fish.width / 2
middle_of_panel = x + 0.5
diff = abs(middle_of_fish - middle_of_panel) / (fish.width / 2)
scale = 1 - diff
min_x = min(max(x, fish.x), x + 1)
max_x = max(min(x+1, fish.x + fish.width), x)
min_y = min(max(y, fish.y), y + 1)
max_y = max(min(y+1, fish.y + fish.height), y)
coverage = (max_x - min_x) * (max_y - min_y)
return coverage * scale
def transition(start, end, step):
"""Return a vector equal to (end - start) * step + start."""
if start == end:
return start
diff_vector = end - start
step_vector = diff_vector / abs(diff_vector) * step
result = step_vector + start
return result
def clamp(low, x, high):
"""Return v such that low <= v <= high and |x - v| is minimal."""
return max(low, min(x, high))
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