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import { MapData } from '../model/data/map';
import { loadSimpleEntity } from '../view/entity';
import { DirectionHandler } from '../view/input/directionhandler';
import { loadMap } from '../view/map';
import { Renderer } from '../view/renderer/renderer';
import { SpriteView } from '../view/sprite';
import { LineSegment, Movement } from '../math/line';
import { getJSON } from '../util';
import { vec2 } from 'gl-matrix';
export class GameContext {
public static async load(renderer: Renderer): Promise<GameContext> {
const mapView = this.loadMap(renderer);
const entity = loadSimpleEntity(renderer, 'simple_circle');
return new GameContext(
renderer,
await mapView,
await entity,
);
}
private static async loadMap(renderer: Renderer): Promise<SpriteView> {
const map = new MapData(await getJSON('resources/map/test.json'));
return loadMap(renderer, map);
}
private time: number|null = null;
private readonly tick = 10; // ms per tick
private readonly speed = 0.05; // movement per tick
private readonly maxSkip = 20; // maximum ticks to process in a single render step
private readonly input: DirectionHandler;
private readonly entityPos: vec2 = vec2.clone([6, 6]);
private readonly entityMovement: vec2 = vec2.create();
private readonly walls: LineSegment[] = [
LineSegment.fromPoints(vec2.fromValues(1, 1), vec2.fromValues(11, 1)),
LineSegment.fromPoints(vec2.fromValues(11, 1), vec2.fromValues(11, 5)),
LineSegment.fromPoints(vec2.fromValues(11, 5), vec2.fromValues(12, 5)),
LineSegment.fromPoints(vec2.fromValues(12, 5), vec2.fromValues(12, 7)),
LineSegment.fromPoints(vec2.fromValues(12, 7), vec2.fromValues(11, 7)),
LineSegment.fromPoints(vec2.fromValues(11, 7), vec2.fromValues(11, 11)),
LineSegment.fromPoints(vec2.fromValues(11, 11), vec2.fromValues(7, 11)),
LineSegment.fromPoints(vec2.fromValues(7, 11), vec2.fromValues(7, 12)),
LineSegment.fromPoints(vec2.fromValues(7, 12), vec2.fromValues(5, 12)),
LineSegment.fromPoints(vec2.fromValues(5, 12), vec2.fromValues(5, 11)),
LineSegment.fromPoints(vec2.fromValues(5, 11), vec2.fromValues(1, 11)),
LineSegment.fromPoints(vec2.fromValues(1, 11), vec2.fromValues(1, 7)),
LineSegment.fromPoints(vec2.fromValues(1, 7), vec2.fromValues(0, 7)),
LineSegment.fromPoints(vec2.fromValues(0, 7), vec2.fromValues(0, 5)),
LineSegment.fromPoints(vec2.fromValues(0, 5), vec2.fromValues(1, 5)),
LineSegment.fromPoints(vec2.fromValues(1, 5), vec2.fromValues(1, 1)),
];
private constructor(
private readonly renderer: Renderer,
private readonly mapView: SpriteView,
private readonly entity: SpriteView,
) {
this.input = new DirectionHandler();
this.input.addListener((v) => {
if (vec2.sqrLen(v) > 0)
vec2.normalize(this.entityMovement, v);
else
vec2.copy(this.entityMovement, [0, 0]);
});
window.requestAnimationFrame(this.render);
}
private updateTime(time: number): number {
const diff = this.time !== null ? time - this.time : 0;
this.time = time;
return diff;
}
private updateStep(): void {
const dest = vec2.scaleAndAdd(vec2.create(), this.entityPos, this.entityMovement, this.speed);
const dest2 = vec2.create();
let rescan = true;
while (rescan) {
rescan = false;
if (vec2.equals(dest, this.entityPos))
return;
const move = new Movement(this.entityPos, dest);
for (const w of this.walls) {
if (!w.collidesMove(dest2, move))
continue;
if (!vec2.exactEquals(dest, dest2)) {
vec2.copy(dest, dest2);
rescan = true;
break;
}
}
}
vec2.copy(this.entityPos, dest);
}
private update(time: number): void {
const diff = Math.min(this.maxSkip, this.updateTime(time));
if (vec2.sqrLen(this.entityMovement) === 0) {
this.renderer.snapToGrid(this.entityPos, this.entityPos);
return;
}
for (let i = 0; i < diff; i++)
this.updateStep();
}
private render = (time: number) => {
this.update(Math.round(time / this.tick));
this.renderer.setCenter(this.entityPos);
this.renderer.clear();
this.mapView.render();
this.renderer.setTranslation(this.entityPos);
this.entity.render();
window.requestAnimationFrame(this.render);
}
}
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