cornerstone-math
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Math and computation geometry functionality for cornerstone
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<h1 class="page-title">math.js</h1>
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<pre class="prettyprint source linenums"><code>const EPSILON = 0.0001;
// Based on THREE.JS
function clamp (x, a, b) {
return (x < a) ? a : ((x > b) ? b : x);
}
function degToRad (degrees) {
const degreeToRadiansFactor = Math.PI / 180;
return degrees * degreeToRadiansFactor;
}
function radToDeg (radians) {
const radianToDegreesFactor = 180 / Math.PI;
return radians * radianToDegreesFactor;
}
// Returns sign of number
function sign (x) {
return typeof x === 'number' ? x ? x < 0 ? -1 : 1 : x === x ? 0 : NaN : NaN;
}
/**
*
* Compare if two numbers are equal(if they have approximately the same value). to prevent js float precision issue
* Adapted from glmatrix
* @param {number} a
* @param {number} b
* @param {number} epsilon Precision to define proximity
* @return {boolean} check whether or not the arguments have approximately the same value
*
*/
function approximatelyEquals (a, b, epsilon) {
const _epsilon = epsilon || EPSILON;
return Math.abs(a - b) <= _epsilon*Math.max(1.0, Math.abs(a), Math.abs(b));
}
export {
clamp,
degToRad,
approximatelyEquals,
radToDeg,
sign
};
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