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game.system.Collision = (entitiesGrid) => {
const update = (elapsedTime, entities, changedIds) => {
for (let entity of Object.keys(entities).map((id) => entities[id])) {
if (entity.hasComponent("controllable") && entity.hasComponent("gridPosition") && entity.hasComponent("momentum")) {
const momentum = unitize(entity.components.momentum);
let found;
const proposed = {x: entity.components.gridPosition.x + momentum.dx, y: entity.components.gridPosition.y + momentum.dy};
const entitiesToPush = [];
let wall = false;
do {
const proposedClampedInBounds = clamp(proposed, game.config.xDim-1, game.config.yDim-1);
if (!equivalence(proposed, proposedClampedInBounds)) {
break;
}
found = false;
const entitiesInCell = entitiesGrid[proposed.y][proposed.x];
for (let next of entitiesInCell.values()) {
if (next.hasComponent("stop")) {
wall = next;
found = false;
break;
}
if (next.hasComponent("pushable")) {
entitiesToPush.push(next);
found = true;
}
}
proposed.x += momentum.dx;
proposed.y += momentum.dy;
} while(found);
if (wall) {
entity.removeComponent("momentum");
} else {
entitiesToPush.map((e) => {
const particles = game.createBorderParticles({
colors: ["#16f7c9", "#0d6e5a", "#2fa18a", "#48cfb4", "#58877d", "#178054", "#2cdb92"],
maxSpeed: 0.20,
minRadius: 1,
maxRadius: 3,
minLife: 100,
maxLife: 300,
minAmount: 20,
maxAmount: 50,
});
particles.addComponent(game.components.Position(e.components.position));
particles.addComponent(game.components.Appearance({width: game.canvas.width / game.config.xDim, height: game.canvas.height / game.config.yDim}));
game.entities[particles.id] = particles;
e.addComponent(game.components.Momentum({...momentum}))
});
}
}
}
return new Set();
};
return { update };
};
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