Created
November 17, 2024 15:42
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Typescript ECS System
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export type ComponentFn<T extends EcsComponent = EcsComponent> = new ( | |
...args: any[] | |
) => T; | |
export type QueryData<T extends QueryObject = QueryObject> = { | |
[P in keyof T]: InstanceType<T[P]>[]; | |
}; | |
export interface QueryObject<T extends ComponentFn = ComponentFn> { | |
[componentName: string]: T; | |
} | |
type UpdateFunction<T extends QueryObject> = ( | |
components: QueryData<T>, | |
gameTime: number, | |
) => void; | |
abstract class EcsComponent {} | |
export class EcsSystem<T extends QueryObject = QueryObject> { | |
private onUpdate: UpdateFunction<T> | null = null; | |
constructor(public query: Readonly<T>) {} | |
runUpdate(components: QueryData<T>, gameTime: number) { | |
if (this.onUpdate) { | |
this.onUpdate(components, gameTime); | |
} | |
} | |
withUpdate(updateFunction: UpdateFunction<T>): void { | |
this.onUpdate = updateFunction; | |
} | |
} | |
class CounterComponent extends EcsComponent { | |
currentValue: number = 0; | |
} | |
const counterSystem = new EcsSystem({ | |
counter: CounterComponent, | |
}); | |
counterSystem.withUpdate(({counter}) => { | |
counter[0].currentValue += 42; | |
console.log("Amount during update", counter[0].currentValue); | |
}); |
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