All files / games/engine/src/systems draw.ts

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import { DisplayInterface } from "jga-games-display";
 
import { AppearanceComponent, ComponentName, PositionComponent } from "../components";
 
import { Entity } from "../entities";
import { System } from "./system";
 
export interface OffsetInterface {
    x: number;
    y: number;
}
 
export class DrawSystem extends System {
    protected display: DisplayInterface;
    protected offset: OffsetInterface;
 
    public constructor(
        entities: Map<string, Entity>,
        display: DisplayInterface,
        offset: OffsetInterface = { x: 0, y: 0 },
    ) {
        super(entities, [ComponentName.APPEARANCE, ComponentName.POSITION]);
        this.display = display;
        this.offset = offset;
    }
 
    public setOffset(offset: OffsetInterface): void {
        this.offset = offset;
    }
 
    public getOffset(): OffsetInterface {
        return this.offset;
    }
 
    public run(): void {
        this.entities.forEach((entity): void => {
            const positionComponent = entity.getComponent(ComponentName.POSITION) as PositionComponent;
 
            const appeareanceComponent = entity.getComponent(ComponentName.APPEARANCE) as AppearanceComponent;
 
            const position = {
                x: positionComponent.getPosition().x - this.offset.x,
                y: positionComponent.getPosition().y - this.offset.y,
            };
 
            this.display.draw(position, appeareanceComponent.getGlyph());
        });
    }
}