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"""Rendering classes and helper functions."""
from __future__ import division
import color
import random
import constants
from constants import *
import math
class Fish(object):
"""Object displayed on the bridge, probably a fish."""
def __init__(self, x, y, width, height, c, step):
"""Create fish with default parameters."""
self.x = x
self.y = y
self.x = 75
self.y = -2
self.width = width
self.width = 75
self.height = height
self.height = 2
self.color = c
self.color = color.RGB(1, 0.5, 0)
self.speed = step
self.step = step
self.wait = 0
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)
self.y += 0.000005
if self.y >= 1:
self.y = 1
self.wait += 1
if self.wait >= 200:
self.wait = 0
self.y = -2
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 self.y == 1:
new_color = color.RGB(0.5, 0.5, 0.5)
else:
new_color = color.RGB(0.5, 0.5, 0)
coverage = compute_coverage(fish, self.x, self.y)
ccolor = new_color * (1 - coverage) + fish.color * coverage
self.light.setRGBRaw(
*map(lambda x: clamp(0, x, 1), ccolor.components)
)
class Bridge(object):
"""Store objects on the bridge."""
def __init__(self, lights, fish, rig):
"""Initialize with lights and fish."""
self.lights = lights
self.fish = fish
self.rig = rig
def update(self):
"""Compute fish coverages and push lights to bridge."""
for x, light_col in enumerate(self.lights):
for y, light in enumerate(light_col):
self.fish.update()
light.update(self.fish)
self.rig.updateOnce()
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))
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