mirror of
https://github.com/ether/etherpad-lite.git
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124 lines
3.4 KiB
JavaScript
124 lines
3.4 KiB
JavaScript
/**
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* This code is mostly from the old Etherpad. Please help us to comment this code.
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* This helps other people to understand this code better and helps them to improve it.
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* TL;DR COMMENTS ON THIS FILE ARE HIGHLY APPRECIATED
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*/
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// DO NOT EDIT THIS FILE, edit infrastructure/ace/www/colorutils.js
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// THIS FILE IS ALSO SERVED AS CLIENT-SIDE JS
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/**
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* Copyright 2009 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS-IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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var colorutils = {};
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// "#ffffff" or "#fff" or "ffffff" or "fff" to [1.0, 1.0, 1.0]
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colorutils.css2triple = function(cssColor)
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{
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var sixHex = colorutils.css2sixhex(cssColor);
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function hexToFloat(hh)
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{
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return Number("0x" + hh) / 255;
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}
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return [hexToFloat(sixHex.substr(0, 2)), hexToFloat(sixHex.substr(2, 2)), hexToFloat(sixHex.substr(4, 2))];
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}
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// "#ffffff" or "#fff" or "ffffff" or "fff" to "ffffff"
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colorutils.css2sixhex = function(cssColor)
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{
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var h = /[0-9a-fA-F]+/.exec(cssColor)[0];
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if (h.length != 6)
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{
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var a = h.charAt(0);
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var b = h.charAt(1);
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var c = h.charAt(2);
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h = a + a + b + b + c + c;
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}
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return h;
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}
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// [1.0, 1.0, 1.0] -> "#ffffff"
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colorutils.triple2css = function(triple)
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{
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function floatToHex(n)
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{
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var n2 = colorutils.clamp(Math.round(n * 255), 0, 255);
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return ("0" + n2.toString(16)).slice(-2);
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}
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return "#" + floatToHex(triple[0]) + floatToHex(triple[1]) + floatToHex(triple[2]);
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}
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colorutils.clamp = function(v, bot, top)
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{
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return v < bot ? bot : (v > top ? top : v);
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};
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colorutils.min3 = function(a, b, c)
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{
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return (a < b) ? (a < c ? a : c) : (b < c ? b : c);
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};
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colorutils.max3 = function(a, b, c)
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{
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return (a > b) ? (a > c ? a : c) : (b > c ? b : c);
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};
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colorutils.colorMin = function(c)
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{
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return colorutils.min3(c[0], c[1], c[2]);
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};
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colorutils.colorMax = function(c)
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{
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return colorutils.max3(c[0], c[1], c[2]);
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};
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colorutils.scale = function(v, bot, top)
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{
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return colorutils.clamp(bot + v * (top - bot), 0, 1);
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};
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colorutils.unscale = function(v, bot, top)
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{
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return colorutils.clamp((v - bot) / (top - bot), 0, 1);
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};
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colorutils.scaleColor = function(c, bot, top)
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{
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return [colorutils.scale(c[0], bot, top), colorutils.scale(c[1], bot, top), colorutils.scale(c[2], bot, top)];
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}
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colorutils.unscaleColor = function(c, bot, top)
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{
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return [colorutils.unscale(c[0], bot, top), colorutils.unscale(c[1], bot, top), colorutils.unscale(c[2], bot, top)];
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}
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colorutils.luminosity = function(c)
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{
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// rule of thumb for RGB brightness; 1.0 is white
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return c[0] * 0.30 + c[1] * 0.59 + c[2] * 0.11;
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}
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colorutils.saturate = function(c)
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{
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var min = colorutils.colorMin(c);
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var max = colorutils.colorMax(c);
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if (max - min <= 0) return [1.0, 1.0, 1.0];
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return colorutils.unscaleColor(c, min, max);
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}
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colorutils.blend = function(c1, c2, t)
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{
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return [colorutils.scale(t, c1[0], c2[0]), colorutils.scale(t, c1[1], c2[1]), colorutils.scale(t, c1[2], c2[2])];
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}
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exports.colorutils = colorutils;
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