38 lines
731 B
JavaScript
38 lines
731 B
JavaScript
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export const TO_RADIANS = 180 / Math.PI;
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export class Vector2 {
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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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}
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add(other) {
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return Vector2(this.x + other.x, this.y + other.y);
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}
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sub(other) {
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return Vector2(this.x - other.x, this.y - other.y);
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}
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scale(s) {
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return Vector2(s * this.x, s * this.y);
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}
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static random(x, y) {
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let theta = random() * 2 * Math.PI;
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// if neither specified, use (1, 1)
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if (x === undefined) {
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x = 1;
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}
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// if only x specified, use (x, x)
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if (y === undefined) {
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y = x;
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}
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return Vector2(x * cos(theta), y * sin(theta));
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}
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static polar(mag, angle) {
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return Vector2(mag * Math.cos(angle), mag * Math.sin(angle));
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}
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}
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