@aappddeevv/dynamics-client-ui/src/Dynamics/colors.js

## What is it? A library to help you create great dynamics applications.

/**
 * See: https://stackoverflow.com/questions/5560248/programmatically-lighten-or-darken-a-hex-color-or-rgb-and-blend-colors
 * 
 * First arg is light, then color1, color2. Color2 means convert.
 * Can take a string color as input. Don't user names of colors
 * as "from" or "to".
 */
export function shadeBlendConvert(p, from, to) {
    if(typeof(p)!="number"||p<-1||p>1||typeof(from)!="string"||(from[0]!='r'&&from[0]!='#')||(typeof(to)!="string"&&typeof(to)!="undefined"))return null; //ErrorCheck
    if(!this.sbcRip)this.sbcRip=(d)=>{
        let l=d.length,RGB=new Object();
        if(l>9){
            d=d.split(",");
            if(d.length<3||d.length>4)return null;//ErrorCheck
            RGB[0]=i(d[0].slice(4)),RGB[1]=i(d[1]),RGB[2]=i(d[2]),RGB[3]=d[3]?parseFloat(d[3]):-1;
        }else{
            if(l==8||l==6||l<4)return null; //ErrorCheck
            if(l<6)d="#"+d[1]+d[1]+d[2]+d[2]+d[3]+d[3]+(l>4?d[4]+""+d[4]:""); //3 digit
            d=i(d.slice(1),16),RGB[0]=d>>16&255,RGB[1]=d>>8&255,RGB[2]=d&255,RGB[3]=l==9||l==5?r(((d>>24&255)/255)*10000)/10000:-1;
        }
        return RGB;}
    var i=parseInt,r=Math.round,h=from.length>9,h=typeof(to)=="string"?to.length>9?true:to=="c"?!h:false:h,b=p<0,p=b?p*-1:p,to=to&&to!="c"?to:b?"#000000":"#FFFFFF",f=this.sbcRip(from),t=this.sbcRip(to);
    if(!f||!t)return null; //ErrorCheck
    if(h)return "rgb("+r((t[0]-f[0])*p+f[0])+","+r((t[1]-f[1])*p+f[1])+","+r((t[2]-f[2])*p+f[2])+(f[3]<0&&t[3]<0?")":","+(f[3]>-1&&t[3]>-1?r(((t[3]-f[3])*p+f[3])*10000)/10000:t[3]<0?f[3]:t[3])+")");
    else return "#"+(0x100000000+(f[3]>-1&&t[3]>-1?r(((t[3]-f[3])*p+f[3])*255):t[3]>-1?r(t[3]*255):f[3]>-1?r(f[3]*255):255)*0x1000000+r((t[0]-f[0])*p+f[0])*0x10000+r((t[1]-f[1])*p+f[1])*0x100+r((t[2]-f[2])*p+f[2])).toString(16).slice(f[3]>-1||t[3]>-1?1:3);
}

export function pastelColour(input_str) {

    //TODO: adjust base colour values below based on theme
    var baseRed = 128;
    var baseGreen = 128;
    var baseBlue = 128;

    //lazy seeded random hack to get values from 0 - 256
    //for seed just take bitwise XOR of first two chars
    //var seed = input_str.charCodeAt(0) ^ input_str.charCodeAt(1);
    var seed = 0;
    for (var i in input_str) { seed ^= i; }

    var rand_1 = Math.abs((Math.sin(seed++) * 10000)) % 256;
    var rand_2 = Math.abs((Math.sin(seed++) * 10000)) % 256;
    var rand_3 = Math.abs((Math.sin(seed++) * 10000)) % 256;

    //build colour
    var red = Math.round((rand_1 + baseRed) / 2);
    var green = Math.round((rand_2 + baseGreen) / 2);
    var blue = Math.round((rand_3 + baseBlue) / 2);

    return { red: red, green: green, blue: blue };
}

export function stringToColour(str) {
    var hash = 0;
    for (var i = 0; i < str.length; i++) {
        hash = str.charCodeAt(i) + ((hash << 5) - hash);
    }
    var colour = '#';
    for (var i = 0; i < 3; i++) {
        var value = (hash >> (i * 8)) & 0xFF;
        colour += ('00' + value.toString(16)).substr(-2);
    }
    return colour;
}