Lottery

[InsomniacPro]

So I'm in the process of coding a lottery system. The problem I'm having is that I can only think of a way to pick items at completely random. I can't figure out how to pick an item on chance. Basically all I'm doing is picking a group of entries with all the same chance value, and picking an item out of there. This is working completely random instead of chance so it kind of messes it up and beefs up the lotto. Any suggestions?

[abdoumatrix]

try something like this i used for using random spell

 Spoiler

//adding them to new dic. with asending ids

PHP Code:

 foreach (ISkill s in Bot.Spells.Values)
                                {
                                    if (Conquer_Online_Server.Database.SpellTable.SpellInformations[s.ID][s.Level].CanKill == true)
                                    {
                                        skills skill = new skills()
                                        {
                                            ID = s.ID,
                                            Level = s.Level
                                        };
                                        Count_AISkills++;
                                        AISkills.Add(Count_AISkills, skill);
                                    }
                                } 


when sellecting

PHP Code:

 num9 = (uint)Kernel.Random.Next(1, (int)Math.Max(1, Count_AISkills));
                    spell = AISkills[num9]; 


most sources use list

 Spoiler

PHP Code:

public class LotteryTable
    {
        public class LotteryItem
        {
            public int Rank, Chance;
            public string Name;
            public uint ID;
            public byte Color;
            public byte Sockets;
            public byte Plus;
        }
        public static List<LotteryItem> LotteryItems = new List<LotteryItem>();
        public static void Load()
        {
            using (var cmd = new MySqlCommand(MySqlCommandType.SELECT).Select("lottery"))
            using (var reader = cmd.CreateReader())
            {
                while (reader.Read())
                {
                    LotteryItem item = new LotteryItem();
                    item.Rank = reader.ReadInt32("Rank");
                    item.Chance = reader.ReadInt32("Chance");
                    item.Name = reader.ReadString("Prize_Name");
                    item.ID = reader.ReadUInt32("Prize_Item");
                    item.Color = reader.ReadByte("Color");
                    item.Sockets = reader.ReadByte("Hole_Num");
                    item.Plus = reader.ReadByte("Addition_Lev");
                    LotteryItems.Add(item);
                }
            }
            Console.WriteLine("Lottery items loaded.");
        }
    } 


[Aceking]

Well create a chance method.

Have the chance percent as an argument, then perform your random calculations, and return if it was a success or failure.
Almost every source in the released section has one of these systems, take a look.
Should be rather easy to create one yourself.

[Super Aids]

Something like this?

	ConquerItem SelectItem()
	{
		while (true)
		{
			foreach (byte key; in m_lotteryItems.keys) // ConquerItemCollection[byte] m_lotteryItems;
			{
				import dconquer.calculations;
				if (ChanceSuccess(key))
					return new ConquerItem(m_lotteryItems[key].SelectRandomItem());
			}
		}
		return null;
	}

ChanceSuccess:

bool ChanceSuccess(byte chance)
{
	import std.random;
	import dconquer.core.generators;

	if (chance >= 100)
		return true;
	auto rn = uniform(0, chance, RandomGenerator);
        return (rn < chance);
}

[Y u k i]

a while(true) loop without a sleep? Fishy.

[Spirited]

Originally Posted by Y u k i

a while(true) loop without a sleep? Fishy.

It's also written in D, hinting he's working on a conquer online server source written in D.

[_DreadNought_]

Originally Posted by Spirited Fang

It's also written in D, hinting he's working on a conquer online server source written in D.

Explains my confusion on a couple keywords :P

[Super Aids]

@Yuki, if you had a bit common sense you'd figure out that it probably wouldn't run infinite, because the rates on items aren't 0% and that some items might have high rates so it would probably only run 1-3 times.

If it makes you happy this could be used:

import core.thread;
Thread.sleep(dur!("msecs")( 1 ));

@fang I was, although I've considering writing a new.