jumpstorm/engine/Game.ts

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import { Entity } from "./entities";
import { System } from "./systems";
export class Game {
private systemOrder: string[];
private running: boolean;
private lastTimeStamp: number;
public entities: Map<string, Entity>;
public systems: Map<string, System>;
public componentEntities: Map<string, Set<string>>;
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constructor() {
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this.lastTimeStamp = performance.now();
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this.running = false;
this.systemOrder = [];
this.systems = new Map();
this.entities = new Map();
this.componentEntities = new Map();
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}
public start() {
this.lastTimeStamp = performance.now();
this.running = true;
}
public addEntity(entity: Entity) {
this.entities.set(entity.id, entity);
}
public getEntity(id: string): Entity | undefined {
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return this.entities.get(id);
}
public removeEntity(id: string) {
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this.entities.delete(id);
}
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public forEachEntityWithComponent(
componentName: string,
callback: (entity: Entity) => void,
) {
this.componentEntities.get(componentName)?.forEach((entityId) => {
const entity = this.getEntity(entityId);
if (!entity) return;
callback(entity);
});
}
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public addSystem(system: System) {
if (!this.systemOrder.includes(system.name)) {
this.systemOrder.push(system.name);
}
this.systems.set(system.name, system);
}
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public getSystem(name: string): System | undefined {
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return this.systems.get(name);
}
public doGameLoop = (timeStamp: number) => {
if (!this.running) {
return;
}
const dt = timeStamp - this.lastTimeStamp;
this.lastTimeStamp = timeStamp;
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// rebuild the Component -> { Entity } map
this.componentEntities.clear();
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this.entities.forEach((entity) =>
entity.getComponents().forEach((component) => {
if (!this.componentEntities.has(component.name)) {
this.componentEntities.set(
component.name,
new Set<string>([entity.id]),
);
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return;
}
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this.componentEntities.get(component.name)?.add(entity.id);
}),
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);
this.systemOrder.forEach((systemName) => {
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this.systems.get(systemName)?.update(dt, this);
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});
};
}