Left 4 Voting

Left 4 Dead has a new VGUI voting system, it's controlled by a bunch of events. You can use either a string from the resource file, or L4D_TargetID_Player which will let you create any vote you want.

How voting works

1. Server sends a vote_started event
2. Servers sends a vote_changed event
3. Clients use the "Vote" command to register their votes ("Yes" or "No"), after which the server sends a vote_cast_yes or vote_cast_no event, followed by a vote_changed event with updated numbers.
4. Server ends the vote by sending vote_ended event, followed by a vote_passed or vote_failed event.

Console Commands

Vote

Note: This command is only valid when a vote is ongoing.

Name:	Vote
Structure:	string option "Yes" or "No"

Events

Note: team is -1 when sent to all players)

vote_ended

Name:	vote_ended
Structure:	None None

vote_started

Name:	vote_started
Structure:	string issue string param1 byte team long initiator entity id of the player who initiated the vote

vote_changed

Name:	vote_changed
Structure:	byte yesVotes byte noVotes byte potentialVotes

vote_passed

Name:	vote_passed
Structure:	string details string param1 byte team

vote_failed

Name:	vote_failed
Structure:	byte team

vote_cast_yes

Name:	vote_cast_yes
Structure:	byte team long entityid entity id of the voter

vote_cast_no

Name:	vote_cast_no
Structure:	byte team long entityid entity id of the voter

Example voting plugin

This is a basic plugin that starts a vote, "Is gaben fat?". It does not ensure the same client does not vote multiple times, nor does it actually kick the user.

#include <sourcemod>
new yesvotes;
new novotes;
#define MAX_VOTES 4

public OnPluginStart()
{
	RegConsoleCmd("testvote",Callvote_Handler);
	RegConsoleCmd("Vote",vote);
}
public Action:Callvote_Handler(client, args)
{
	new Handle:msg = CreateEvent("vote_started");
	SetEventString(msg,"issue","#L4D_TargetID_Player");
	SetEventString(msg,"param1","Is gaben fat?");
	SetEventInt(msg,"team",0);
	SetEventInt(msg,"initiator",0);
	FireEvent(msg);
	
	yesvotes = 0;
	novotes = 0;
	UpdateVotes();
	
	return Plugin_Handled;
}
public UpdateVotes()
{
	new Handle:msg = CreateEvent("vote_changed");
	SetEventInt(msg,"yesVotes",yesvotes);
	SetEventInt(msg,"noVotes",novotes);
	SetEventInt(msg,"potentialVotes",MAX_VOTES);
	FireEvent(msg);
	
	if (yesvotes+novotes == MAX_VOTES)
	{
		PrintToServer("voting complete!");
		msg = CreateEvent("vote_ended");
		FireEvent(msg);
		if (yesvotes > novotes)
		{
			msg = CreateEvent("vote_passed");
			SetEventString(msg,"details","#L4D_TargetID_Player");
			SetEventString(msg,"param1","Gaben is fat");
			SetEventInt(msg,"team",0);
			FireEvent(msg);
		}
		else
		{
			msg = CreateEvent("vote_failed");
			SetEventInt(msg,"team",0);
			FireEvent(msg);
		}
	}
}
public Action:vote(client, args)
{
	new String:arg[8];
	GetCmdArg(1,arg,8);
	PrintToServer("Got vote %s from %i",arg,client);
	if (strcmp(arg,"Yes",true) == 0)
	{
		yesvotes++;
	}
	else if (strcmp(arg,"No",true) == 0)
	{
		novotes++;
	}
	
	UpdateVotes();
	return Plugin_Continue;
}

See the following images for examples what this looks like:

http://devicenull.org/temp/l4d_question.jpg

http://devicenull.org/temp/l4d_result.jpg

See Also

• Left 4 Voting 2
• TF2 Voting
• BuiltinVotes, a SourceMod extension that exposes a voting API that uses this voting system.