70 lines
1.3 KiB
JavaScript
70 lines
1.3 KiB
JavaScript
import {compose} from '@avocado/core';
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import {Vector} from '@avocado/math';
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import {EventEmitter} from '@avocado/mixins';
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import {Trait} from '../trait';
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const decorate = compose(
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EventEmitter,
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Vector.Mixin('_position', 'x', 'y', {
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track: true,
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}),
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);
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// < 16768 will pack into 1 short per axe and give +/- 0.25 precision.
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class PositionedBase extends Trait {
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static defaultState() {
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return {
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x: 0,
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y: 0,
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};
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}
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initialize() {
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this.on('_positionChanged', (oldPosition, newPosition) => {
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const x = Math.floor(newPosition[0]) * 4;
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const y = Math.floor(newPosition[1]) * 4;
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this.state = this.state.set('x', x).set('y', y);
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this.entity.emit('positionChanged', oldPosition, newPosition);
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});
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const x = this.state.get('x') / 4;
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const y = this.state.get('y') / 4;
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this._position = [x, y];
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}
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get position() {
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return this._position;
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}
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set position(position) {
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this._position = position;
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}
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transformPatchValue(key, value) {
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if (-1 !== ['x', 'y'].indexOf(key)) {
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return value / 4;
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}
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super.transformPatchValue(key, value);
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}
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get x() {
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return this.x;
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}
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set x(x) {
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this.x = x;
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}
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get y() {
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return this.y;
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}
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set y(y) {
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this.y = y;
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}
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}
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export class Positioned extends decorate(PositionedBase) {}
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