rainbow.user.js

// ==UserScript==
// @name          johnRainbow
// @namespace    http://w3.tbd.my/
// @description   Masukkan shoutbox ngan rainbow text
// @include       http://w3.tbd.my/index.php
// @include       http://w3.tbd.my/
// ==/UserScript==

function init() {
    var textarea = document.getElementById("shout_data");
    var img = document.createTextNode("[ rainbow ]");
    button = document.createElement('a');
    button.href = '#';
    button.addEventListener('click', MakeSFX, false);
    button.appendChild(img);
    textarea.parentNode.insertBefore(button, textarea);
}


function tohex(decval) {
    var l, h;
    var str = "";

    l = Math.floor(decval % 16);
    h = Math.floor(decval / 16);

    if (h < 10) {
        str = "" + h;
    }
    if (h > 9) {
        switch (h) {
        case 10:
            str = "A";
            break;
        case 11:
            str = "B";
            break;
        case 12:
            str = "C";
            break;
        case 13:
            str = "D";
            break;
        case 14:
            str = "E";
            break;
        case 15:
            str = "F";
            break;
        default:
            str = "X";
            break;
        }
    }

    if (l < 10) {
        str = str + "" + l;
    }
    if (l > 9) {
        switch (l) {
        case 10:
            str += "A";
            break;
        case 11:
            str += "B";
            break;
        case 12:
            str += "C";
            break;
        case 13:
            str += "D";
            break;
        case 14:
            str += "E";
            break;
        case 15:
            str += "F";
            break;
        default:
            str += "X";
            break;
        }
    }

    return str;
}

function getSFXColor(k) {
    var r, g, b, k1, min, max;

    if (g_cstyle == 0) {

        k1 = k;
        r = 127 + 127 * Math.cos(k1 - .5);
        g = 127 + 127 * Math.cos(k1 - 2.5);
        b = 127 + 127 * Math.cos(k1 - 4.5);

        min = r;
        if (g < min) min = g;
        if (b < min) min = b;

        r -= min;
        g -= min;
        b -= min;

        max = r;
        if (g > max) max = g;
        if (b > max) max = b;

        max = 255.0 / max;
        r *= max;
        g *= max;
        b *= max;

        max = 1;
        min = 0;

        r = r * max + min;
        g = g * max + min;
        b = b * max + min;

        if (r < 0) r = 0;
        if (g < 0) g = 0;
        if (b < 0) b = 0;

        if (r > 255) r = 255;
        if (g > 255) g = 255;
        if (b > 255) b = 255;

    }
    g_r = r;
    g_g = g;
    g_b = b;

}

function MakeSFX() {

    var shout = document.getElementById("shout_data");
    var r, g, b;
    var i, j, k, l;
    var x, scale, res;
    var min, max;
    var in_tag = 0;
    var oignumi = 0;
    temp = new String("");

    instr = new String(shout.value);
    outstr = new String("");
    tempstr = new String("");
    res = 2;
    if (res < 1) res = 1;

    j = instr.length;

    scale = Math.PI * (2 - .21) / j;
    g_cstyle = 0;

    for (i = 0; i < j; i++) {

        if (instr.charAt(i) == "<") in_tag = 1;
        if (in_tag == 0) {

            k = scale * i;
            getSFXColor(k);
            r = g_r;
            g = g_g;
            b = g_b;

            tempstr = tohex(r) + tohex(g) + tohex(b);

            temp = instr.charAt(i);

            if (instr.charAt(i) == "&") {

                for (l = i + 1; l < j; l++) {
                    if (instr.charAt(l) == " ") break;
                    if (instr.charAt(l) == "<") break;
                    if (instr.charAt(l) == ">") break;
                    if (instr.charAt(l) == ";") break;
                }
                if (instr.charAt(l) == ";") {
                    temp = instr.substr(i, l - i + 1);
                }

            }


            if (i % res == 0) {
                outstr = outstr + "[color=#" + tempstr + "]";
                oignumi = 1;
            }
            outstr = outstr + temp;
            if ((i + 1) % res == 0) {
                outstr = outstr + "[/color]";
                oignumi = 0;
            }
            if (temp.length > 1) i += (temp.length - 1);

        }
        if (in_tag == 1) outstr = outstr + instr.charAt(i);
        if (instr.charAt(i) == ">") in_tag = 0;

    }

    if (oignumi > 0) {
        outstr = outstr + "[/color]";
    }
    //shout.focus();
    shout.value = "";
    shout.value = outstr;
    //shout.focus();
}

init();