ColorPalette dispenses colors.

platform/features/plot-reborn/src/ColorPalette.js

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+/*****************************************************************************
+ * Open MCT Web, Copyright (c) 2014-2015, United States Government
+ * as represented by the Administrator of the National Aeronautics and Space
+ * Administration. All rights reserved.
+ *
+ * Open MCT Web is licensed under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ * Open MCT Web includes source code licensed under additional open source
+ * licenses. See the Open Source Licenses file (LICENSES.md) included with
+ * this source code distribution or the Licensing information page available
+ * at runtime from the About dialog for additional information.
+ *****************************************************************************/
+
+/*global define*/
+define(
+    function () {
+        'use strict';
+
+        var COLOR_PALETTE = [
+            [ 0x20, 0xB2, 0xAA ],
+            [ 0x9A, 0xCD, 0x32 ],
+            [ 0xFF, 0x8C, 0x00 ],
+            [ 0xD2, 0xB4, 0x8C ],
+            [ 0x40, 0xE0, 0xD0 ],
+            [ 0x41, 0x69, 0xFF ],
+            [ 0xFF, 0xD7, 0x00 ],
+            [ 0x6A, 0x5A, 0xCD ],
+            [ 0xEE, 0x82, 0xEE ],
+            [ 0xCC, 0x99, 0x66 ],
+            [ 0x99, 0xCC, 0xCC ],
+            [ 0x66, 0xCC, 0x33 ],
+            [ 0xFF, 0xCC, 0x00 ],
+            [ 0xFF, 0x66, 0x33 ],
+            [ 0xCC, 0x66, 0xFF ],
+            [ 0xFF, 0x00, 0x66 ],
+            [ 0xFF, 0xFF, 0x00 ],
+            [ 0x80, 0x00, 0x80 ],
+            [ 0x00, 0x86, 0x8B ],
+            [ 0x00, 0x8A, 0x00 ],
+            [ 0xFF, 0x00, 0x00 ],
+            [ 0x00, 0x00, 0xFF ],
+            [ 0xF5, 0xDE, 0xB3 ],
+            [ 0xBC, 0x8F, 0x8F ],
+            [ 0x46, 0x82, 0xB4 ],
+            [ 0xFF, 0xAF, 0xAF ],
+            [ 0x43, 0xCD, 0x80 ],
+            [ 0xCD, 0xC1, 0xC5 ],
+            [ 0xA0, 0x52, 0x2D ],
+            [ 0x64, 0x95, 0xED ]
+        ];
+
+        /**
+         * A representation of a color that allows conversions between different
+         * formats.
+         *
+         * @constructor
+         */
+        function Color(integerArray) {
+            this.integerArray = integerArray;
+        }
+
+        /**
+         * Return color as a three element array of RGB values, where each value
+         * is a integer in the range of 0-255.
+         *
+         * @return {number[]} the color, as integer RGB values
+         */
+        Color.prototype.asIntegerArray = function () {
+            return this.integerArray.map(function (c) {
+                return c;
+            });
+        };
+
+       /**
+        * Return color as a string using #-prefixed six-digit RGB hex notation
+        * (e.g. #FF0000).  See http://www.w3.org/TR/css3-color/#rgb-color.
+        *
+        * @return {string} the color, as a style-friendly string
+        */
+
+        Color.prototype.asHexString = function () {
+            return '#' + this.integerArray.map(function (c) {
+                return (c < 16 ? '0' : '') + c.toString(16);
+            }).join('');
+        };
+
+        /**
+         * Return color as a RGBA float array.
+         *
+         * This format is present specifically to support use with
+         * WebGL, which expects colors of that form.
+         *
+         * @return {number[]} the color, as floating-point RGBA values
+         */
+        Color.prototype.asRGBAArray = function () {
+            return this.integerArray.map(function (c) {
+                return c / 255.0;
+            }).concat([1]);
+        };
+
+        /**
+         * A color palette which returns colors from a predefined palette.
+         * When all colors in the palette have been allocated, it starts reusing
+         * colors.
+         *
+         * @constructor
+         */
+        function ColorPalette() {
+            this.nextColor = 0;
+            this.colors = COLOR_PALETTE.map(function (color) {
+                return new Color(color);
+            });
+        }
+
+        /**
+         *
+         * @return {Color} the next color in the palette.
+         */
+        ColorPalette.prototype.getColor = function () {
+            var color = this.colors[this.nextColor % this.colors.length];
+            this.nextColor++;
+            return color;
+        };
+
+        return ColorPalette;
+    }
+);