32 lines
1.4 KiB
JavaScript
32 lines
1.4 KiB
JavaScript
"use strict";
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import { DiagonalDirections, Directions } from '../../Directions';
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import { MINIMAL_RECOGNIZABLE_MAGNITUDE } from '../constants';
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export default class Vector {
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constructor(x, y) {
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this.x = x;
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this.y = y;
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this._magnitude = Math.hypot(this.x, this.y);
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const isMagnitudeSufficient = this._magnitude > MINIMAL_RECOGNIZABLE_MAGNITUDE;
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this.unitX = isMagnitudeSufficient ? this.x / this._magnitude : 0;
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this.unitY = isMagnitudeSufficient ? this.y / this._magnitude : 0;
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}
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static fromDirection(direction) {
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return DirectionToVectorMappings.get(direction) ?? new Vector(0, 0);
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}
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static fromVelocity(tracker, pointerId) {
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const velocity = tracker.getVelocity(pointerId);
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return velocity ? new Vector(velocity.x, velocity.y) : null;
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}
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get magnitude() {
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return this._magnitude;
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}
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computeSimilarity(vector) {
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return this.unitX * vector.unitX + this.unitY * vector.unitY;
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}
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isSimilar(vector, threshold) {
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return this.computeSimilarity(vector) > threshold;
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}
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}
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const DirectionToVectorMappings = new Map([[Directions.LEFT, new Vector(-1, 0)], [Directions.RIGHT, new Vector(1, 0)], [Directions.UP, new Vector(0, -1)], [Directions.DOWN, new Vector(0, 1)], [DiagonalDirections.UP_RIGHT, new Vector(1, -1)], [DiagonalDirections.DOWN_RIGHT, new Vector(1, 1)], [DiagonalDirections.UP_LEFT, new Vector(-1, -1)], [DiagonalDirections.DOWN_LEFT, new Vector(-1, 1)]]);
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//# sourceMappingURL=Vector.js.map
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