91 lines
1.6 KiB
JavaScript
91 lines
1.6 KiB
JavaScript
import {Trait} from '@avocado/entity';
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import {Camera} from '../camera';
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export class Followed extends Trait {
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static defaultParams() {
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return {
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viewSize: [320, 180],
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}
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}
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static type() {
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return 'followed';
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}
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constructor(entity, params, state) {
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super(entity, params, state);
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const camera = new Camera();
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camera.viewSize = this.params.viewSize;
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this._camera = camera;
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this.updatePosition();
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this.onRoomSizeChanged();
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}
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destroy() {
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if (!this.entity.is('roomed')) {
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return;
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}
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const room = this.entity.room;
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if (room) {
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room.off('sizeChanged', this.onRoomSizeChanged);
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}
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}
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get camera() {
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return this._camera;
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}
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onRoomSizeChanged() {
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if (!this.entity.is('roomed')) {
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return;
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}
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const room = this.entity.room;
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if (room) {
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this._camera.areaSize = room.size;
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}
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}
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updatePosition() {
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if (!this.entity.is('positioned')) {
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return;
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}
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this._camera.position = this.entity.position;
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}
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listeners() {
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return {
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addedToRoom: () => {
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this.onRoomSizeChanged();
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this.entity.room.on('sizeChanged', this.onRoomSizeChanged, this);
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},
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removedFromRoom: (room) => {
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room.off('sizeChanged', this.onRoomSizeChanged);
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},
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traitAdded: (type) => {
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if (-1 === [
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'positioned',
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'followed',
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].indexOf(type)) {
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return;
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}
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this.updatePosition();
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},
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}
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}
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tick(elapsed) {
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this.updatePosition();
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}
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renderTick(elapsed) {
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this._camera.tick(elapsed);
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}
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}
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