给定这个函数，我想用随机颜色生成器替换颜色。
document.overlay = GPolyline.fromEncoded({
color: "#0000FF",
weight: 10,
points: encoded_points,
zoomFactor: 32,
levels: encoded_levels,
numLevels: 4
});
我该怎么做呢?
当前回答
我想要材质-颜色ui。这个答案是stackoverflow
和这个github repo defaultPalette()，我做了这个javascript，你可以导入到，你可以通过const color= defaultPalette()调用它;or const color = defaultPalette('flatui');
<!-- language: lang-js -->
const defaultPalette = {
// Red, Pink, Purple, Deep Purple, Indigo, Blue, Light Blue, Cyan, Teal, Green, Light Green, Lime, Yellow, Amber, Orange, Deep Orange, Brown, Grey, Blue Grey
'50': ['#FFEBEE', '#FCE4EC', '#F3E5F5', '#EDE7F6', '#E8EAF6', '#E3F2FD', '#E1F5FE', '#E0F7FA', '#E0F2F1', '#E8F5E9', '#F1F8E9', '#F9FBE7', '#FFFDE7', '#FFF8E1', '#FFF3E0', '#FBE9E7', '#EFEBE9', '#FAFAFA', '#ECEFF1'],
'100': ['#FFCDD2', '#F8BBD0', '#E1BEE7', '#D1C4E9', '#C5CAE9', '#BBDEFB', '#B3E5FC', '#B2EBF2', '#B2DFDB', '#C8E6C9', '#DCEDC8', '#F0F4C3', '#FFF9C4', '#FFECB3', '#FFE0B2', '#FFCCBC', '#D7CCC8', '#F5F5F5', '#CFD8DC'],
'200': ['#EF9A9A', '#F48FB1', '#CE93D8', '#B39DDB', '#9FA8DA', '#90CAF9', '#81D4FA', '#80DEEA', '#80CBC4', '#A5D6A7', '#C5E1A5', '#E6EE9C', '#FFF59D', '#FFE082', '#FFCC80', '#FFAB91', '#BCAAA4', '#EEEEEE', '#B0BEC5'],
'300': ['#E57373', '#F06292', '#BA68C8', '#9575CD', '#7986CB', '#64B5F6', '#4FC3F7', '#4DD0E1', '#4DB6AC', '#81C784', '#AED581', '#DCE775', '#FFF176', '#FFD54F', '#FFB74D', '#FF8A65', '#A1887F', '#E0E0E0', '#90A4AE'],
'400': ['#EF5350', '#EC407A', '#AB47BC', '#7E57C2', '#5C6BC0', '#42A5F5', '#29B6F6', '#26C6DA', '#26A69A', '#66BB6A', '#9CCC65', '#D4E157', '#FFEE58', '#FFCA28', '#FFA726', '#FF7043', '#8D6E63', '#BDBDBD', '#78909C'],
'500': ['#F44336', '#E91E63', '#9C27B0', '#673AB7', '#3F51B5', '#2196F3', '#03A9F4', '#00BCD4', '#009688', '#4CAF50', '#8BC34A', '#CDDC39', '#FFEB3B', '#FFC107', '#FF9800', '#FF5722', '#795548', '#9E9E9E', '#607D8B'],
'600': ['#E53935', '#D81B60', '#8E24AA', '#5E35B1', '#3949AB', '#1E88E5', '#039BE5', '#00ACC1', '#00897B', '#43A047', '#7CB342', '#C0CA33', '#FDD835', '#FFB300', '#FB8C00', '#F4511E', '#6D4C41', '#757575', '#546E7A'],
'700': ['#D32F2F', '#C2185B', '#7B1FA2', '#512DA8', '#303F9F', '#1976D2', '#0288D1', '#0097A7', '#00796B', '#388E3C', '#689F38', '#AFB42B', '#FBC02D', '#FFA000', '#F57C00', '#E64A19', '#5D4037', '#616161', '#455A64'],
'800': ['#C62828', '#AD1457', '#6A1B9A', '#4527A0', '#283593', '#1565C0', '#0277BD', '#00838F', '#00695C', '#2E7D32', '#558B2F', '#9E9D24', '#F9A825', '#FF8F00', '#EF6C00', '#D84315', '#4E342E', '#424242', '#37474F'],
'900': ['#B71C1C', '#880E4F', '#4A148C', '#311B92', '#1A237E', '#0D47A1', '#01579B', '#006064', '#004D40', '#1B5E20', '#33691E', '#827717', '#F57F17', '#FF6F00', '#E65100', '#BF360C', '#3E2723', '#212121', '#263238'],
'A100': ['#FF8A80', '#FF80AB', '#EA80FC', '#B388FF', '#8C9EFF', '#82B1FF', '#80D8FF', '#84FFFF', '#A7FFEB', '#B9F6CA', '#CCFF90', '#F4FF81', '#FFFF8D', '#FFE57F', '#FFD180', '#FF9E80'],
'A200': ['#FF5252', '#FF4081', '#E040FB', '#7C4DFF', '#536DFE', '#448AFF', '#40C4FF', '#18FFFF', '#64FFDA', '#69F0AE', '#B2FF59', '#EEFF41', '#FFFF00', '#FFD740', '#FFAB40', '#FF6E40'],
'A400': ['#FF1744', '#F50057', '#D500F9', '#651FFF', '#3D5AFE', '#2979FF', '#00B0FF', '#00E5FF', '#1DE9B6', '#00E676', '#76FF03', '#C6FF00', '#FFEA00', '#FFC400', '#FF9100', '#FF3D00'],
'A700': ['#D50000', '#C51162', '#AA00FF', '#6200EA', '#304FFE', '#2962FF', '#0091EA', '#00B8D4', '#00BFA5', '#00C853', '#64DD17', '#AEEA00', '#FFD600', '#FFAB00', '#FF6D00', '#DD2C00'],
'flatui': ['#1ABC9C', '#2ECC71', '#3498DB', '#9B59B6', '#34495E', '#16A085', '#27AE60', '#2980B9', '#8E44AD', '#2C3E50', '#F1C40F', '#E67E22', '#E74C3C', '#ECF0F1', '#95A5A6', '#F39C12', '#D35400', '#C0392B', '#BDC3C7', '#7F8C8D'],
'metro': ['#A4C400', '#60A917', '#008A00', '#00ABA9', '#1BA1E2', '#0050EF', '#6A00FF', '#AA00FF', '#F472D0', '#D80073', '#A20025', '#E51400', '#FA6800', '#F0A30A', '#E3C800', '#825A2C', '#6D8764', '#647687', '#76608A', '#A0522D']
}
const defaultBase = ['50', '100', '200', '300', '400', '500', '600', '700', '800', '900', 'A100', 'A200', 'A400', 'A700', 'flatui', 'metro']
const randomIntFromInterval = (min, max) => { // min and max included
return Math.floor(Math.random() * (max - min + 1) + min)
}
export default (choosePalette)=>{
if (choosePalette === undefined) {
const nrindexdefault = defaultBase.length - 1;
const number = randomIntFromInterval(0, nrindexdefault);
const defaultPaletteColorsArray = defaultPalette[defaultBase[number]];
const nrindexcolor = defaultPaletteColorsArray.length - 1;
const defaultColor = randomIntFromInterval(0, nrindexcolor)
return defaultPaletteColorsArray[defaultColor];
} else {
const defaultPaletteColorsArray = defaultPalette[choosePalette];
const nrindexcolor = defaultPaletteColorsArray.length - 1;
const defaultColor = randomIntFromInterval(0, nrindexcolor)
return defaultPaletteColorsArray[defaultColor];
}
}
其他回答
这段代码(Mohsen的)不能生成像#fcfc80这样的颜色。
'#' + Math.random().toString(16).substr(-6);
Nicolas Buduroi的方法有效，除非Math.random()返回0，合理。
'#' + (Math.random().toString(16) + "000000").substring(2,8)
这段代码生成了很多非法的颜色(比如#abcde)。
'#' + Math.floor(Math.random()*16777215).toString(16);
我一直在用(+1或其他也可以，但我习惯了毫无理由的+2)
"#" + ((Math.random()+2)*16777216|0).toString(16).slice(1)
我已经生成了100种不同对比度的不同颜色，你可以根据需要增加数值:
Feedle举例:http://jsfiddle.net/zFbfE/29/ -
// CHANGE THE INITIAL SEED HERE
Math.seed = 23;
/**
* Math.seededRandom()
*
*/
Math.seededRandom = function(max, min) {
max = max || 1;
min = min || 0;
Math.seed = (Math.seed * 9301 + 49297) % 233280;
var rnd = Math.seed / 233280.0;
return min + rnd * (max - min);
}
var c, r = 0,
l = 100000,
t,
random = [],
seededRandom = [];
for(var i=0; i<100; i++)
{
random[i] = 0;
seededRandom[i] = 0;
}
// Do some loops withouth benchmarking
// to have a "fair" comparison
/*for (c = 0; c < l; ++c) {
r = 5+5;
}*/
// benchmark Math.random()
t = new Date().getTime();
s = '';
// benchmark Math.seededRandom()
t = new Date().getTime();
while(l--){
r = Math.seededRandom();
seededRandom[(r*100)|0] += 1;
}
var inc = 0;
for(c=0; c<seededRandom.length; c++) {
//var inc=15;
for(var i=0; i<seededRandom.length; i++)
{
if(i!==c) {
if(seededRandom[c] == seededRandom[i]) {
seededRandom[c] += inc;
inc = inc + 10;
// console.log(seededRandom[c]);
}
}
}
inc = inc > 255 ? 0 : inc;
}
var a=[], b=[], d=[], inc=0, dec=255;
for(c=0; c<seededRandom.length; c++) {
a[c] = (seededRandom[c] % 100) + inc;
b[c] = dec - Math.floor(seededRandom[c]/100);
if(b[c] < 0)
b[c] = b[c]* - 1;
if(a[c] > 255)
a[c] -= 255;
d[c] = Math.floor(b[c]/2);
inc += 5;
dec -= 5;
}
var app = angular.module("myAppp", []).controller('myCtrl',function($scope, $http) {
$scope.id = [];
for(var i=0; i<seededRandom.length; i++)
$scope.id.push(i);
// Generate random number
$scope.Icon = [];$scope.Icon2 = [], $scope.Icon3 = [];
var ran = 0, inc = 5, dec = 255;
for(var i=0;i<seededRandom.length;i++)
{
$scope.Icon.push(a[i]%100);
$scope.Icon2.push(b[i]%100);
$scope.Icon3.push(d[i]%100);
console.log(a[i] + "|" + b[i] + "|" + d[i]);
}
});
它对我有用，我想它对你也会有帮助。
这个例子中最好的一点是，它将生成100个随机颜色，并且每个页面加载的颜色都是相同的。
这是我的两个版本的随机十六进制代码生成器。
/* Slowest but shortest. */
"#000000".replace(/0/g,function(){return (~~(Math.random()*16)).toString(16);});
/* Good performance with small size. */
"#"+(function(a,b){while(a--){b+=""+(~~(Math.random()*16)).toString(16);} return b;})(6,"");
/* Remy Sharp provided one that's the fastest but a little bit too long */
(function(h){return '#000000'.substr(0,7-h.length)+h})((~~(Math.random()*(1<<24))).toString(16))
Paul Irish写的文章《JavaScript中的随机十六进制颜色代码生成器》绝对令人惊叹。使用:
'#' + Math.floor(Math.random()*16777215).toString(16).padStart(6, '0');
感谢Haytam分享padStart来解决十六进制代码长度的问题。
function generateRandomColor()
{
var randomColor = '#'+Math.floor(Math.random()*16777215).toString(16);
return randomColor;
//random color will be freshly served
}
document.body.style.backgroundColor = generateRandomColor() // -> #e1ac94
someDiv.style.color = generateRandomColor() // -> #34c7aa
