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Merge pull request #5184 from ericrius1/utilities

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Utilities
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Philip Rosedale 2015-06-22 12:14:17 -07:00
commit fd96c3a280
1 changed files with 38 additions and 34 deletions
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72
examples/utilities.js
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@ -9,48 +9,52 @@
// Distributed under the Apache License, Version 2.0.
// See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
function hslToRgb(hslColor) {
var h = hslColor.hue;
var s = hslColor.sat;
var l = hslColor.light;
var r, g, b;
if (s == 0) {
r = g = b = l; // achromatic
} else {
var hue2rgb = function hue2rgb(p, q, t) {
if (t < 0) t += 1;
if (t > 1) t -= 1;
if (t < 1 / 6) return p + (q - p) * 6 * t;
if (t < 1 / 2) return q;
if (t < 2 / 3) return p + (q - p) * (2 / 3 - t) * 6;
return p;
map = function(value, min1, max1, min2, max2) {
return min2 + (max2 - min2) * ((value - min1) / (max1 - min1));
}
hslToRgb = function(hslColor) {
var h = hslColor.hue;
var s = hslColor.sat;
var l = hslColor.light;
var r, g, b;
if (s == 0) {
r = g = b = l; // achromatic
} else {
var hue2rgb = function hue2rgb(p, q, t) {
if (t < 0) t += 1;
if (t > 1) t -= 1;
if (t < 1 / 6) return p + (q - p) * 6 * t;
if (t < 1 / 2) return q;
if (t < 2 / 3) return p + (q - p) * (2 / 3 - t) * 6;
return p;
}
var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
var p = 2 * l - q;
r = hue2rgb(p, q, h + 1 / 3);
g = hue2rgb(p, q, h);
b = hue2rgb(p, q, h - 1 / 3);
}
var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
var p = 2 * l - q;
r = hue2rgb(p, q, h + 1 / 3);
g = hue2rgb(p, q, h);
b = hue2rgb(p, q, h - 1 / 3);
}
return {
red: Math.round(r * 255),
green: Math.round(g * 255),
blue: Math.round(b * 255)
};
return {
red: Math.round(r * 255),
green: Math.round(g * 255),
blue: Math.round(b * 255)
};
}
function map(value, min1, max1, min2, max2) {
return min2 + (max2 - min2) * ((value - min1) / (max1 - min1));
}
function randFloat(low, high) {
return low + Math.random() * (high - low);
randFloat = function(low, high) {
return low + Math.random() * (high - low);
}
function randInt(low, high) {
return Math.floor(randFloat(low, high));
randInt = function(low, high) {
return Math.floor(randFloat(low, high));
}