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
投票最多的回答表明，Martin Ankerl的方法比随机十六进制数字更好，尽管我还没有改进Ankerl的方法，但我已经成功地将其翻译成JavaScript。
我想我应该对这个已经非常大的Stack Overflow问题发布一个额外的答案，因为顶部的答案有另一个评论链接到一个带有Ankerl逻辑的JavaScript实现的Gist，而这个链接是坏的(404)。如果我有这样的声誉，我就会简单地注释我创建的jsbin链接。
// Adapted from
// http://jsfiddle.net/Mottie/xcqpF/1/light/
const rgb2hex = (rgb) => {
return (rgb && rgb.length === 3) ? "#" +
("0" + parseInt(rgb[0],10).toString(16)).slice(-2) +
("0" + parseInt(rgb[1],10).toString(16)).slice(-2) +
("0" + parseInt(rgb[2],10).toString(16)).slice(-2) : '';
}
// The next two methods are converted from Ruby to JavaScript.
// It is sourced from http://martin.ankerl.com/2009/12/09/how-to-create-random-colors-programmatically/
// # HSV values in [0..1[
// # returns [r, g, b] values from 0 to 255
const hsv_to_rgb = (h, s, v) => {
const h_i = Math.floor(h*6)
const f = h*6 - h_i
const p = v * (1 - s)
const q = v * (1 - (f * s))
const t = v * (1 - (1 - f) * s)
let r, g, b
switch(h_i) {
case(0):
[r, g, b] = [v, t, p]
break
case(1):
[r, g, b] = [q, v, p]
break
case(2):
[r, g, b] = [p, v, t]
break
case(3):
[r, g, b] = [p, q, v]
break
case(4):
[r, g, b] = [t, p, v]
break
case(5):
[r, g, b] = [v, p, q]
break
}
return [Math.floor(r * 256), Math.floor(g * 256), Math.floor(b * 256)]
}
// # Use the golden ratio
const golden_ratio_conjugate = 0.618033988749895
let h = Math.random() // # Use a random start value
const gen_hex = (numberOfColors) => {
const colorArray = []
while (numberOfColors > 0) {
h += golden_ratio_conjugate
h %= 1
colorArray.push(rgb2hex(hsv_to_rgb(h, 0.99, 0.99)))
numberOfColors -= 1
}
console.log(colorArray)
return colorArray
}
gen_hex(100)
https://jsbin.com/qeyevoj/edit?js,console
其他回答
function get_random_color() {
return "#" + (Math.round(Math.random() * 0XFFFFFF)).toString(16);
}
http://jsfiddle.net/XmqDz/1/
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];
}
}
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)
Use:
function random_color(format)
{
var rint = Math.round(0xffffff * Math.random());
switch(format)
{
case 'hex':
return ('#0' + rint.toString(16)).replace(/^#0([0-9a-f]{6})$/i, '#$1');
break;
case 'rgb':
return 'rgb(' + (rint >> 16) + ',' + (rint >> 8 & 255) + ',' + (rint & 255) + ')';
break;
default:
return rint;
break;
}
}
升级版:
function random_color( format ){
var rint = Math.floor( 0x100000000 * Math.random());
switch( format ){
case 'hex':
return '#' + ('00000' + rint.toString(16)).slice(-6).toUpperCase();
case 'hexa':
return '#' + ('0000000' + rint.toString(16)).slice(-8).toUpperCase();
case 'rgb':
return 'rgb(' + (rint & 255) + ',' + (rint >> 8 & 255) + ',' + (rint >> 16 & 255) + ')';
case 'rgba':
return 'rgba(' + (rint & 255) + ',' + (rint >> 8 & 255) + ',' + (rint >> 16 & 255) + ',' + (rint >> 24 & 255)/255 + ')';
default:
return rint;
}
}
正则表达式
总是返回有效的十六进制6位颜色
"#xxxxxx".replace(/x/g, y=>(Math.random()*16|0).toString(16))
令c= "#xxxxxx"。替换(/ x / g, y = > (math . random () * 16 | 0) .toString (16)); console.log (c); document.body.style.background = c
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