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244
boid.py
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244
boid.py
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import pygame as pg
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from math import sqrt, ceil, floor
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from random import random, randint
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from lpgf import Pane, DynamicPane, isoceles_triangle
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SCREEN_DIMENSIONS = (1500, 1000)
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PADDING_CONSTANT = 0.75
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FRAME_RATE = 144
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N_BOIDS = 250
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def clamp(x, min, max) -> int:
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if x < min:
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return min
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if x > max:
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return max
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return x
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def surface_color(position: pg.Vector2, surf: pg.Surface) -> tuple[int,int,int]:
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rect = surf.get_rect()
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x = clamp(position.x, 0, rect.width)
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y = clamp(position.y, 0, rect.height)
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return (
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ceil(255 * (x / rect.width)),
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ceil(255 * (y / rect.height)),
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100
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)
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class Boid:
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def __init__(
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self,
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search_radius: float,
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separation_radius: float,
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max_speed: float,
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cohesion: float,
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alignment: float,
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separation: float,
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bounds: pg.Rect,
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image: pg.Surface = isoceles_triangle((15,10)) #this is the same triangle instance on purpose
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):
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self.position = pg.Vector2(randint(bounds.left, bounds.right), randint(bounds.top, bounds.bottom))
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self.velocity = pg.Vector2(2*(random()-0.5)*max_speed, 2*(random()-0.5)*max_speed) #Know this can technically produce velicities higher than max, dont care
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self._acceleration = pg.Vector2(0,0)
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self._max_speed = max_speed
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self.cohesion = cohesion
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self.alignment = alignment
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self.separation = separation
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self.bounds = bounds
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self._radius_squared = search_radius**2
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self._separation_radius_squared = separation_radius**2
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self._image = pg.transform.scale_by(image, random() * 0.5 + 0.5)
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@property
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def search_radius(self):
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return sqrt(self._radius_squared)
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@search_radius.setter
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def search_radius(self, rad: float):
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self._radius_squared = rad**2
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@property
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def separation_radius(self):
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return sqrt(self._separation_radius_squared)
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@separation_radius.setter
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def separation_radius(self, speed: float):
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self._max_speed_squared = speed**2
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def calculate_next_timestep(self, boids: list['Boid']):
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centroid_target = pg.Vector2(0,0)
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velocity_target = pg.Vector2(0,0)
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nearby = 0
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for b in boids:
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if (self.position-b.position).length_squared() > self._radius_squared or b is self:
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continue
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centroid_target += b.position
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velocity_target += b.velocity
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nearby += 1
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if (self.position - b.position).length_squared() < self._separation_radius_squared:
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self._acceleration += self.separation * (self.position - b.position).normalize()
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if nearby > 0:
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centroid_target /= nearby
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velocity_target /= nearby
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self._acceleration += self.cohesion * (centroid_target - self.position).normalize()
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self._acceleration += self.alignment * velocity_target.normalize()
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if self.position.y < self.bounds.top:
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self._acceleration += pg.Vector2(0,150)
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elif self.position.y > self.bounds.bottom:
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self._acceleration -= pg.Vector2(0,150)
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if self.position.x < self.bounds.left:
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self._acceleration += pg.Vector2(150,0)
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elif self.position.x > self.bounds.right:
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self._acceleration -= pg.Vector2(150,0)
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def attract(self, p: pg.Vector2, radius: float, strength: float) -> None:
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diff = p - self.position
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if diff.length_squared() < radius**2:
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self._acceleration += strength * diff.normalize()
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def update(self, dt: float) -> None:
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self.velocity += dt * self._acceleration
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if self.velocity.length_squared() > self._max_speed**2:
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self.velocity.scale_to_length(self._max_speed)
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self.position += self.velocity * dt
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self._acceleration = pg.Vector2(0,0)
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def draw(self, surface: pg.Surface):
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image = self._image.copy() #as per pygame docs, do not continuously rotate an image. Make a copy of a prefab image
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image.fill(surface_color(self.position, surface), special_flags=pg.BLEND_ADD)
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image = pg.transform.rotate(image, self.velocity.angle_to(pg.Vector2(1,0)))
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surface.blit(image, self.position)
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class BoidSim:
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def set_attractor(self, m_pos):
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self._attractor = m_pos
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def clear_attractor(self, _):
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self._attractor = None
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def set_repulsor(self, m_pos):
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self._repulsor = m_pos
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def clear_repulsor(self, _):
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self._repulsor = None
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def clear_all(self, m_pos):
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self.clear_repulsor(m_pos)
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self.clear_attractor(m_pos)
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def spawn(self, m_pos):
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boid = Boid(
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150,
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20,
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100,
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80,
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80,
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100,
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self._pane.get_rect().scale_by(0.75),
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)
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boid.position = pg.Vector2(m_pos)
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self._boids.append(boid)
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def __init__(self, n_boids: int, pane: Pane):
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self._pane: Pane = pane
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self._pane.on_click_held = self.set_attractor
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self._pane.on_click_release = self.clear_attractor
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self._pane.on_right_click = self.set_repulsor
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self._pane.on_right_click_release = self.clear_repulsor
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self._pane.on_middle_click = self.spawn
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self._pane.on_mouse_exit = self.clear_all
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self._attractor: tuple[int,int] | None = None
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self._repulsor: tuple[int,int] | None = None
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self._boids: list[Boid] = []
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bounds = pane.get_rect_position_zero().scale_by(0.75)
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for _ in range(n_boids):
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self._boids.append(
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Boid(
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150,
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20,
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100,
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80,
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80,
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100,
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bounds,
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)
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)
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def update(self, dt: float):
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for boid in self._boids:
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boid.calculate_next_timestep(self._boids)
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if self._attractor:
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boid.attract(self._attractor, 200, 1000)
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if self._repulsor:
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boid.attract(self._repulsor, 200, -1000)
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boid.update(dt)
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boid.draw(self._pane)
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def main():
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running = True
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pg.init()
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clock = pg.time.Clock()
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cat = pg.image.load("cat.png")
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screen: Pane = Pane.master_pane(SCREEN_DIMENSIONS, (0,0,255))
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boid_pane1 = DynamicPane(
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(cat.get_rect().width, cat.get_rect().height),
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(10,10),
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screen,
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10,
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blanking_color=(150,0,150),
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background_image=cat
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)
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boid_pane2 = DynamicPane(
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(200,200),
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(250,250),
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boid_pane1.content_pane,
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10,
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blanking_color=(0,0,0,100),
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ribbon_color=(0,50,100,180),
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content_flags=pg.SRCALPHA,
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ribbon_flags=pg.SRCALPHA
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)
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DynamicPane(
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(100,100),
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(0,0),
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screen,
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10,
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blanking_color=(255,255,255,0),
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background_image=isoceles_triangle((100,90)),
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content_flags=pg.SRCALPHA
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)
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sim1 = BoidSim(20, screen)
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sim2 = BoidSim(20, boid_pane2.content_pane)
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while running:
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screen.blank()
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screen.update()
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screen.poll_mouse()
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dt = clock.tick(FRAME_RATE) / 1000
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print(screen._subpanes)
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events = pg.event.get()
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for event in events:
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if event.type == pg.QUIT:
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running = False
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sim1.update(dt)
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sim2.update(dt)
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screen.draw()
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pg.display.flip()
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if __name__ == "__main__":
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main()
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