mirror of
https://github.com/jiawanlong/Cesium-Examples.git
synced 2025-11-04 01:04:17 +00:00
308 lines
7.1 KiB
JavaScript
308 lines
7.1 KiB
JavaScript
/*
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RainbowVis-JS
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Released under Eclipse Public License - v 1.0
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*/
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function Rainbow()
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{
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"use strict";
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var gradients = null;
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var minNum = 0;
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var maxNum = 100;
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var colours = ['ff0000', 'ffff00', '00ff00', '0000ff'];
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setColours(colours);
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function setColours (spectrum)
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{
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if (spectrum.length < 2) {
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throw new Error('Rainbow must have two or more colours.');
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} else {
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var increment = (maxNum - minNum)/(spectrum.length - 1);
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var firstGradient = new ColourGradient();
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firstGradient.setGradient(spectrum[0], spectrum[1]);
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firstGradient.setNumberRange(minNum, minNum + increment);
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gradients = [ firstGradient ];
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for (var i = 1; i < spectrum.length - 1; i++) {
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var colourGradient = new ColourGradient();
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colourGradient.setGradient(spectrum[i], spectrum[i + 1]);
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colourGradient.setNumberRange(minNum + increment * i, minNum + increment * (i + 1));
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gradients[i] = colourGradient;
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}
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colours = spectrum;
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}
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}
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this.setSpectrum = function ()
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{
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setColours(arguments);
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return this;
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}
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this.setSpectrumByArray = function (array)
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{
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setColours(array);
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return this;
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}
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this.colourAt = function (number)
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{
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if (isNaN(number)) {
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throw new TypeError(number + ' is not a number');
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} else if (gradients.length === 1) {
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return gradients[0].colourAt(number);
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} else {
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var segment = (maxNum - minNum)/(gradients.length);
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var index = Math.min(Math.floor((Math.max(number, minNum) - minNum)/segment), gradients.length - 1);
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return gradients[index].colourAt(number);
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}
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}
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this.colorAt = this.colourAt;
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this.setNumberRange = function (minNumber, maxNumber)
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{
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if (maxNumber > minNumber) {
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minNum = minNumber;
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maxNum = maxNumber;
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setColours(colours);
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} else {
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throw new RangeError('maxNumber (' + maxNumber + ') is not greater than minNumber (' + minNumber + ')');
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}
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return this;
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}
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}
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function ColourGradient()
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{
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"use strict";
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var startColour = 'ff0000';
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var endColour = '0000ff';
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var minNum = 0;
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var maxNum = 100;
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this.setGradient = function (colourStart, colourEnd)
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{
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startColour = getHexColour(colourStart);
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endColour = getHexColour(colourEnd);
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}
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this.setNumberRange = function (minNumber, maxNumber)
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{
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if (maxNumber > minNumber) {
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minNum = minNumber;
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maxNum = maxNumber;
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} else {
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throw new RangeError('maxNumber (' + maxNumber + ') is not greater than minNumber (' + minNumber + ')');
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}
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}
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this.colourAt = function (number)
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{
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return calcHex(number, startColour.substring(0,2), endColour.substring(0,2))
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+ calcHex(number, startColour.substring(2,4), endColour.substring(2,4))
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+ calcHex(number, startColour.substring(4,6), endColour.substring(4,6));
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}
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function calcHex(number, channelStart_Base16, channelEnd_Base16)
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{
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var num = number;
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if (num < minNum) {
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num = minNum;
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}
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if (num > maxNum) {
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num = maxNum;
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}
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var numRange = maxNum - minNum;
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var cStart_Base10 = parseInt(channelStart_Base16, 16);
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var cEnd_Base10 = parseInt(channelEnd_Base16, 16);
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var cPerUnit = (cEnd_Base10 - cStart_Base10)/numRange;
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var c_Base10 = Math.round(cPerUnit * (num - minNum) + cStart_Base10);
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return formatHex(c_Base10.toString(16));
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}
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function formatHex(hex)
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{
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if (hex.length === 1) {
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return '0' + hex;
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} else {
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return hex;
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}
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}
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function isHexColour(string)
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{
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var regex = /^#?[0-9a-fA-F]{6}$/i;
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return regex.test(string);
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}
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function getHexColour(string)
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{
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if (isHexColour(string)) {
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return string.substring(string.length - 6, string.length);
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} else {
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var name = string.toLowerCase();
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if (colourNames.hasOwnProperty(name)) {
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return colourNames[name];
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}
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throw new Error(string + ' is not a valid colour.');
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}
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}
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// Extended list of CSS colornames s taken from
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// http://www.w3.org/TR/css3-color/#svg-color
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var colourNames = {
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aliceblue: "F0F8FF",
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antiquewhite: "FAEBD7",
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aqua: "00FFFF",
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aquamarine: "7FFFD4",
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azure: "F0FFFF",
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beige: "F5F5DC",
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bisque: "FFE4C4",
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black: "000000",
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blanchedalmond: "FFEBCD",
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blue: "0000FF",
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blueviolet: "8A2BE2",
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brown: "A52A2A",
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burlywood: "DEB887",
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cadetblue: "5F9EA0",
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chartreuse: "7FFF00",
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chocolate: "D2691E",
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coral: "FF7F50",
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cornflowerblue: "6495ED",
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cornsilk: "FFF8DC",
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crimson: "DC143C",
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cyan: "00FFFF",
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darkblue: "00008B",
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darkcyan: "008B8B",
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darkgoldenrod: "B8860B",
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darkgray: "A9A9A9",
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darkgreen: "006400",
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darkgrey: "A9A9A9",
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darkkhaki: "BDB76B",
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darkmagenta: "8B008B",
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darkolivegreen: "556B2F",
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darkorange: "FF8C00",
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darkorchid: "9932CC",
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darkred: "8B0000",
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darksalmon: "E9967A",
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darkseagreen: "8FBC8F",
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darkslateblue: "483D8B",
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darkslategray: "2F4F4F",
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darkslategrey: "2F4F4F",
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darkturquoise: "00CED1",
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darkviolet: "9400D3",
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deeppink: "FF1493",
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deepskyblue: "00BFFF",
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dimgray: "696969",
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dimgrey: "696969",
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dodgerblue: "1E90FF",
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firebrick: "B22222",
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floralwhite: "FFFAF0",
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forestgreen: "228B22",
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fuchsia: "FF00FF",
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gainsboro: "DCDCDC",
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ghostwhite: "F8F8FF",
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gold: "FFD700",
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goldenrod: "DAA520",
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gray: "808080",
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green: "008000",
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greenyellow: "ADFF2F",
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grey: "808080",
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honeydew: "F0FFF0",
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hotpink: "FF69B4",
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indianred: "CD5C5C",
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indigo: "4B0082",
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ivory: "FFFFF0",
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khaki: "F0E68C",
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lavender: "E6E6FA",
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lavenderblush: "FFF0F5",
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lawngreen: "7CFC00",
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lemonchiffon: "FFFACD",
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lightblue: "ADD8E6",
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lightcoral: "F08080",
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lightcyan: "E0FFFF",
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lightgoldenrodyellow: "FAFAD2",
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lightgray: "D3D3D3",
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lightgreen: "90EE90",
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lightgrey: "D3D3D3",
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lightpink: "FFB6C1",
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lightsalmon: "FFA07A",
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lightseagreen: "20B2AA",
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lightskyblue: "87CEFA",
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lightslategray: "778899",
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lightslategrey: "778899",
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lightsteelblue: "B0C4DE",
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lightyellow: "FFFFE0",
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lime: "00FF00",
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limegreen: "32CD32",
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linen: "FAF0E6",
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magenta: "FF00FF",
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maroon: "800000",
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mediumaquamarine: "66CDAA",
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mediumblue: "0000CD",
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mediumorchid: "BA55D3",
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mediumpurple: "9370DB",
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mediumseagreen: "3CB371",
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mediumslateblue: "7B68EE",
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mediumspringgreen: "00FA9A",
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mediumturquoise: "48D1CC",
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mediumvioletred: "C71585",
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midnightblue: "191970",
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mintcream: "F5FFFA",
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mistyrose: "FFE4E1",
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moccasin: "FFE4B5",
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navajowhite: "FFDEAD",
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navy: "000080",
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oldlace: "FDF5E6",
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olive: "808000",
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olivedrab: "6B8E23",
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orange: "FFA500",
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orangered: "FF4500",
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orchid: "DA70D6",
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palegoldenrod: "EEE8AA",
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palegreen: "98FB98",
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paleturquoise: "AFEEEE",
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palevioletred: "DB7093",
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papayawhip: "FFEFD5",
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peachpuff: "FFDAB9",
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peru: "CD853F",
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pink: "FFC0CB",
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plum: "DDA0DD",
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powderblue: "B0E0E6",
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purple: "800080",
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red: "FF0000",
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rosybrown: "BC8F8F",
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royalblue: "4169E1",
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saddlebrown: "8B4513",
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salmon: "FA8072",
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sandybrown: "F4A460",
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seagreen: "2E8B57",
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seashell: "FFF5EE",
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sienna: "A0522D",
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silver: "C0C0C0",
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skyblue: "87CEEB",
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slateblue: "6A5ACD",
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slategray: "708090",
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slategrey: "708090",
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snow: "FFFAFA",
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springgreen: "00FF7F",
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steelblue: "4682B4",
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tan: "D2B48C",
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teal: "008080",
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thistle: "D8BFD8",
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tomato: "FF6347",
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turquoise: "40E0D0",
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violet: "EE82EE",
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wheat: "F5DEB3",
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white: "FFFFFF",
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whitesmoke: "F5F5F5",
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yellow: "FFFF00",
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yellowgreen: "9ACD32"
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}
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}
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if (typeof module !== 'undefined') {
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module.exports = Rainbow;
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} |