21 lines
372 B
JavaScript
21 lines
372 B
JavaScript
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export function lengthSquared(p) {
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return p.x * p.x + p.y * p.y;
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}
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export function length(p) {
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return Math.sqrt(lengthSquared(p));
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}
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export function normalize(p) {
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const l = length(p);
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return { x: p.x / l, y: p.y / l };
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}
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export function dot(a, b) {
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return a.x * b.x + a.y * b.y;
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}
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export function subtract(a, b) {
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return { x: a.x - b.x, y: a.y - b.y };
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}
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