134 lines
5.6 KiB
Python
134 lines
5.6 KiB
Python
from typing import Optional
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from physics.CollisionDirection import CollisionDirection
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from physics.TickData import TickData
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from sprite.DynamicSprite import DynamicSprite
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from sprite.Sprite import Sprite
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from sprite.StaticSprite import StaticSprite
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from ui_elements.UiElement import UiElement
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MOTION_STEPS = 10
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TOLERANCE = 1
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class PhysicsElementsHandler:
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def __init__(self):
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self.collision_callbacks = []
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def add_collision_callback(self, callback):
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self.collision_callbacks.append(callback)
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def remove_collision_callback(self, callback):
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self.collision_callbacks.remove(callback)
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def tick(self, tick_data: TickData, layers: dict[str, list[UiElement]]):
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sprites = []
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for layer in layers:
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for sprite in layers[layer]:
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sprite.tick(tick_data)
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if isinstance(sprite, Sprite):
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sprites.append(sprite)
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# handle motion and collisions. To do this:
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# 1. Find all sprites that have collision enabled and store them in a list
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# 2. Create a list of all sprites that are dynamic sprites
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# 3. Sort the sprites by their y position
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# 4. For each sprite:
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# 4.1. Divide the motion into MOTION_STEPS steps
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# 4.2. For each step:
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# 4.2.1. Check if the sprite collides with any other sprite
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# 4.2.2. If it does, move the sprite back to the previous position and stop the motion
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# 4.2.3. If it doesn't, move the sprite to the new position
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colliders = [sprite for sprite in sprites if isinstance(sprite, StaticSprite) and sprite.is_collider]
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for collider in colliders:
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collider.reset_collides_with()
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dynamic_sprites = [sprite for sprite in sprites if isinstance(sprite, DynamicSprite)]
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sorted_dynamic_sprites = sorted(dynamic_sprites, key=lambda spr: spr.position_scale.position[1])
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for sprite in sorted_dynamic_sprites:
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collides_with = self.attempt_move(tick_data.dt, sprite, colliders, MOTION_STEPS)
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if collides_with is not None:
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for callback in self.collision_callbacks:
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callback(sprite, collides_with)
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def attempt_move(self, dt: float, sprite: DynamicSprite, colliders: list[StaticSprite],
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motion_steps: int) -> Optional[StaticSprite]:
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total_motion = sprite.motion
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motion_step = ((total_motion[0] * dt) / motion_steps, (total_motion[1] * dt) / motion_steps)
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collides_with_last = None
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collided = [False, False]
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for i in range(motion_steps):
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if not collided[0]:
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sprite.position_scale.position = (
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sprite.position_scale.position[0] + motion_step[0],
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sprite.position_scale.position[1]
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)
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collides_with = self.check_collides(sprite, colliders)
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if collides_with is not None:
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sprite.position_scale.position = (
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sprite.position_scale.position[0] - motion_step[0],
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sprite.position_scale.position[1]
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)
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if sprite.motion[0] > 0:
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sprite.add_collides_with(
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CollisionDirection(CollisionDirection.RIGHT, sprite, collides_with))
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collides_with.add_collides_with(
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CollisionDirection(CollisionDirection.LEFT, collides_with, sprite))
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if sprite.motion[0] < 0:
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sprite.add_collides_with(
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CollisionDirection(CollisionDirection.LEFT, sprite, collides_with))
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collides_with.add_collides_with(
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CollisionDirection(CollisionDirection.RIGHT, collides_with, sprite))
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sprite.motion = (0, sprite.motion[1])
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collides_with_last = collides_with
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collided[0] = True
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if not collided[1]:
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sprite.position_scale.position = (
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sprite.position_scale.position[0],
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sprite.position_scale.position[1] + motion_step[1]
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)
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collides_with = self.check_collides(sprite, colliders)
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if collides_with is not None:
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sprite.position_scale.position = (
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sprite.position_scale.position[0],
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sprite.position_scale.position[1] - motion_step[1]
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)
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if sprite.motion[1] > 0:
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sprite.add_collides_with(
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CollisionDirection(CollisionDirection.BOTTOM, sprite, collides_with))
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collides_with.add_collides_with(
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CollisionDirection(CollisionDirection.TOP, collides_with, sprite))
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if sprite.motion[1] < 0:
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sprite.add_collides_with(
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CollisionDirection(CollisionDirection.TOP, sprite, collides_with))
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collides_with.add_collides_with(
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CollisionDirection(CollisionDirection.BOTTOM, collides_with, sprite))
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sprite.motion = (sprite.motion[0], 0)
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collides_with_last = collides_with
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collided[1] = True
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return collides_with_last
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def check_collides(self, sprite: StaticSprite, colliders: list[StaticSprite]) -> Optional[StaticSprite]:
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for collider in colliders:
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if sprite is not collider:
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if sprite.collides_with(collider, TOLERANCE):
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return collider
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return None
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