35 lines
847 B
JavaScript
35 lines
847 B
JavaScript
export const subtract = (a, b) => ({
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x: a.x - b.x,
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y: a.y - b.y
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});
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export const add = (a, b) => ({
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x: a.x + b.x,
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y: a.y + b.y
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});
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export const scale = (v, factor) => ({
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x: v.x * factor,
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y: v.y * factor
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});
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export const divide = (v, factor) => ({
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x: v.x / factor,
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y: v.y / factor
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});
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export const normal = (v) => ({
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x: -v.y,
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y: v.x
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});
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export const equals = (a, b) => a.x === b.x && a.y === b.y;
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export const almostEquals = (a, b) => Math.abs(a.x - b.x) < 0.001 && Math.abs(a.y - b.y) < 0.001;
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export const dot = (a, b) => a.x * b.x + a.y * b.y;
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export const length = (v) => Math.sqrt(v.x * v.x + v.y * v.y);
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export const distanceTo = (a, b) => length(subtract(a, b));
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export const angle = (v) => Math.atan2(v.y, v.x);
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export const normalize = (v) => {
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const l = length(v);
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return {
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x: v.x / l,
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y: v.y / l
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};
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};
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