The avatar for @tonyhschu
Tony Chu
Published
Edited
Feb 23, 2018
8 stars
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rotateVector = (vector, theta) => {
const { x, y } = vector
// first column of the matrix
const xa = x * Math.cos(theta)
const xb = x * Math.sin(theta)
// second column of the matrix
const yc = y * -Math.sin(theta)
const yd = y * Math.cos(theta)
// sum the components
return {
x: xa + yc,
y: xb + yd
}
}
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resultA = rotateVector({ x: 1, y: 0 }, theta)
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resultB = rotateVector({ x: 0, y: 1 }, theta)
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resultC = rotateVector({ x: 1, y: 1 }, theta)
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