rainbowArmor.java (Source code)

import java.util.*;
import java.io.*;

public class rainbowArmor
{
    public static void main(String[] args) throws IOException
    {
        int r = 255;
        int g = 0;
        int b = 0;
        int mode = 0;
        int tick = 0;
        String output = "scoreboard players set @a[tag=rainbowArmor,score_timer="+tick+",score_timer_min="+tick+"] timer 0\n";

        do
        {
            int color = (r << 16) + (g << 8) + b;

            output += "replaceitem entity @a[tag=rainbowArmor,score_timer="+tick+",score_timer_min="+tick+"] slot.armor.head leather_helmet 1 0 {Unbreakable:1,display:{color:"+color+"}}\nreplaceitem entity @a[tag=rainbowArmor,score_timer="+tick+",score_timer_min="+tick+"] slot.armor.chest leather_chestplate 1 0 {Unbreakable:1,display:{color:"+color+"}}\nreplaceitem entity @a[tag=rainbowArmor,score_timer="+tick+",score_timer_min="+tick+"] slot.armor.legs leather_leggings 1 0 {Unbreakable:1,display:{color:"+color+"}}\nreplaceitem entity @a[tag=rainbowArmor,score_timer="+tick+",score_timer_min="+tick+"] slot.armor.feet leather_boots 1 0 {Unbreakable:1,display:{color:"+color+"}}\nscoreboard players add @a[tag=rainbowArmor,score_timer="+tick+",score_timer_min="+tick+"] timer 1\n";

            tick++;

            switch(mode)
            {
                case 0: g++;break;
                case 1: r--;break;
                case 2: b++;break;
                case 3: g--;break;
                case 4: r++;break;
                case 5: b--;break;
            }

            if(r==255 && g==0 && b==0)
                mode = 0;
            else if(r==255 && g==255 && b==0)
                mode = 1;
            else if(r==0 && g==255 && b==0)
                mode = 2;
            else if(r==0 && g==255 && b==255)
                mode = 3;
            else if(r==0 && g==0 && b==255)
                mode = 4;
            else if(r==255 && g==0 && b==255)
                mode = 5;

            //System.out.println(r+" "+g+" "+b+" "+mode+" "+(r != 255 && g != 0 && b != 0));
        } while(!(r==255 && g==0 && b==0));

        OutputStream out = new FileOutputStream("rainbowArmor.mcfunction");
        out.write(output.getBytes());
        out.close();
    }
}