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from __future__ import division
import color
import random
import constants
from constants import *
import math
from show import Show
class Fish(object):
"""Object displayed on the bridge, probably a fish."""
def __init__(self, x, y, width, height, color, step):
"""Create fish with default parameters."""
self.x = x
self.y = y
self.width = width
self.height = height
self.color = color
self.speed = step
self.step = step
def update(self):
"""Swim gently to the other side of the bridge."""
self.x += self.step
if self.x > 200:
self.x = 0
self.y = 0.25 + 0.25 * math.sin(math.pi * self.x / 10)
#theta = random.random() * math.pi / 2 - math.pi / 4
#self.y += 0.01 * math.sin(theta)
#print(self.y)
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.transitioning_to = self.color
self.step = 0
self.x = x
self.y = y
def update(self, fish):
"""Change color depending on where the fish is."""
if abs(self.transitioning_to - self.color) <= self.step:
self.transitioning_to = pick_HSV().to_RGB()
self.step = (random_change()
* abs(self.color - self.transitioning_to))
new_background = transition(
self.color, self.transitioning_to, self.step
)
coverage = compute_coverage(fish, self.x, self.y)
#coverage *= coverage
new_color = coverage * fish.color + (1 - coverage) * new_background
#new_color = new_background
self.color = new_background
if self.x == 30 and self.y == 0:
pass
#print(self.color.r(), self.color.g(), self.color.b())
self.light.setRGBRaw(
*map(lambda x: clamp(0, x, 1), new_color.components)
)
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 pick_HSV():
"""Return a random color in an appropriate interval."""
hue = random.random() * (constants.MAX_HUE - constants.MIN_HUE) + constants.MIN_HUE
saturation = random.random() * (MAX_SATURATION - MIN_SATURATION) + MIN_SATURATION
value = random.random() * (MAX_VALUE - MIN_VALUE) + MIN_VALUE
return color.HSV(hue, saturation, value)
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 random_change():
"""Return a random amount that a light should change each frame."""
min_time = int(constants.MIN_TIME * FRAME_RATE)
max_time = int(MAX_TIME * FRAME_RATE)
return 1 / random.randint(min_time, max_time)
def clamp(low, x, high):
"""Return v such that low <= v <= high and |x - v| is minimal."""
return max(low, min(x, high))
class FishShow(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.fish = Fish(0, 0, 23, 1.5, color.black, 1)
def update(self):
self.fish.update()
for light in self.lights:
light.update(self.fish)
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