colorPalette.js
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
import {makeInner, normalizeToArray} from '../../util/model';
var inner = makeInner();
function getNearestColorPalette(colors, requestColorNum) {
var paletteNum = colors.length;
// TODO colors must be in order
for (var i = 0; i < paletteNum; i++) {
if (colors[i].length > requestColorNum) {
return colors[i];
}
}
return colors[paletteNum - 1];
}
export default {
clearColorPalette: function () {
inner(this).colorIdx = 0;
inner(this).colorNameMap = {};
},
/**
* @param {string} name MUST NOT be null/undefined. Otherwise call this function
* twise with the same parameters will get different result.
* @param {Object} [scope=this]
* @param {Object} [requestColorNum]
* @return {string} color string.
*/
getColorFromPalette: function (name, scope, requestColorNum) {
scope = scope || this;
var scopeFields = inner(scope);
var colorIdx = scopeFields.colorIdx || 0;
var colorNameMap = scopeFields.colorNameMap = scopeFields.colorNameMap || {};
// Use `hasOwnProperty` to avoid conflict with Object.prototype.
if (colorNameMap.hasOwnProperty(name)) {
return colorNameMap[name];
}
var defaultColorPalette = normalizeToArray(this.get('color', true));
var layeredColorPalette = this.get('colorLayer', true);
var colorPalette = ((requestColorNum == null || !layeredColorPalette)
? defaultColorPalette : getNearestColorPalette(layeredColorPalette, requestColorNum));
// In case can't find in layered color palette.
colorPalette = colorPalette || defaultColorPalette;
if (!colorPalette || !colorPalette.length) {
return;
}
var color = colorPalette[colorIdx];
if (name) {
colorNameMap[name] = color;
}
scopeFields.colorIdx = (colorIdx + 1) % colorPalette.length;
return color;
}
};