60 lines
1.5 KiB
JavaScript
60 lines
1.5 KiB
JavaScript
import {System} from '@/ecs/index.js';
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// import {RESOLUTION} from '@/util/constants.js'
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// const [hx, hy] = [RESOLUTION.x / 2, RESOLUTION.y / 2];
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export default class FollowCamera extends System {
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static queries() {
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return {
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default: ['Camera', 'Position'],
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};
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}
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reindex(entities) {
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super.reindex(entities);
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for (const id of entities) {
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this.updateCamera(1, this.ecs.get(id));
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}
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}
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tick(elapsed) {
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for (const {id} of this.select('default')) {
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this.updateCamera(elapsed * 3, this.ecs.get(id));
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}
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}
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updateCamera(portion, entity) {
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const {Camera, Position} = entity;
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if (Camera && Position) {
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// const {AreaSize: {x, y}} = this.ecs.get(1);
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// const [px, py] = [
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// Math.max(hx, Math.min(Math.round(Position.x), x - hx)),
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// Math.max(hy, Math.min(Math.round(Position.y), y - hy)),
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// ];
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const [px, py] = [
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Math.round(Position.x),
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Math.round(Position.y),
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];
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if (Camera.x === px && Camera.y === py) {
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return;
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}
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if (Math.abs(Camera.x - px) < 0.01) {
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Camera.x = px;
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}
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if (Math.abs(Camera.y - py) < 0.01) {
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Camera.y = py;
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}
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const [dx, dy] = [
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(px - Camera.x) * portion,
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(py - Camera.y) * portion,
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];
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[Camera.x, Camera.y] = [
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Camera.x + (Math.sign(dx) * Math.max(0.01, Math.abs(dx))),
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Camera.y + (Math.sign(dy) * Math.max(0.01, Math.abs(dy))),
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];
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}
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}
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}
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