MLPV2 RLV Capture Plugin

MLPV2
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This is another RLV plugin I wrote. It is used in a Ball. On touch it allows to choose an avatar within a range and tries to capture the selected avatar, forcing them to sit on the ball.
// ~capture Script V1.01
// drop into a ball
//
// constants
integer DEBUG           = FALSE;

float TIMER_TIMEOUT     = 60.0;
float TIMER_LOCKED      = 900.0;
integer RANGE_CAPTURE   = 20;

integer RELAY_CHANNEL   = -1812221819;

// texts
string MSG_NO_SENSOR   = "No avatars in sensor range.";
string MSG_MENU_IN_USE = " is using the menu. Please try again in a while.";
string MSG_CHOOSE_AV   = "Choose avatar:";
string MSG_TIMEOUT     = "Dialog timeout. Please touch again to retry.";

// internal use
integer dialog_handle;
integer dialog_channel;
key avatar_victim = NULL_KEY;
integer channel;

list sensor_keys;
list sensor_names;
key avatar_menu;

// write a log message in DEBUG mode
log(string message)
{
	if (DEBUG) llOwnerSay("MENU: " + message);
}

// out a message to the user
out(string message)
{
	llSay(0, message);
}

capture(key avatar)
{
	relay(avatar, "@sit:" + (string)llGetKey() + "=force");
}

lock(key avatar)
{
	relay(avatar, "@unsit=n");
}

release(key avatar)
{
	relay(avatar, "@unsit=y");
	relay(avatar, "!release");
}

// write a message to the RLV Relay
relay(key avatar, string message)
{
	if (avatar != NULL_KEY)
	{
		llSay(RELAY_CHANNEL, llGetObjectName() + "," + (string) avatar + "," + message);
		log("RLV: " + llGetObjectName() + "," + (string) avatar + "," + message);
	}
}

init()
{
	dialog_channel= -(integer)(llFrand(100000 - 10000) + 10000);
	dialog_handle = llListen(dialog_channel, "", NULL_KEY, "");
	llListenControl(dialog_handle, FALSE);
	avatar_menu = NULL_KEY;
}

// default state
default
{
	// on state entry: show dialog
	state_entry()
	{
		init();
	}

	on_rez(integer start_param)
	{
		channel = start_param;
		init();
	}

	// av touched me
	touch_start(integer total_number)
	{
		key id = llDetectedKey(0);

		// check if menu is in use
		if (avatar_menu != NULL_KEY && id != avatar_menu)
		{
			out(llKey2Name(avatar_menu) + MSG_MENU_IN_USE);
			return;
		}

		avatar_menu = id;
		llSensor("", NULL_KEY, AGENT, RANGE_CAPTURE, PI);
	}

	// no av in sensor range
	no_sensor()
	{
		out(MSG_NO_SENSOR);
	}

	// some av in sensor range
	sensor(integer total_number)
	{
		sensor_keys = [];
		sensor_names = [];
		integer i;
		for(i=0; i < total_number; i++)
		{
			key id = llDetectedKey(i);
			string name = llKey2Name(id);
			if (llStringLength(name) > 24)
			{
				name = llGetSubString(name, 0, 23);
			}
			sensor_keys += [id];
			sensor_names += [name];
			log("found: " + name);
		}

		// show dialog if list contains names
		if (llGetListLength(sensor_names) > 0)
		{
			llListenControl(dialog_handle, TRUE);
			llSetTimerEvent(TIMER_TIMEOUT);
			llDialog(avatar_menu, MSG_CHOOSE_AV, sensor_names, dialog_channel);
		}
	}

	// menu selected
	listen(integer channel, string name, key id, string message)
	{
		llListenControl(dialog_handle, FALSE);
		integer index = llListFindList(sensor_names, [message]);
		if (index != -1)
		{
			key selected = llList2Key(sensor_keys, index);
			log ("capture " + llKey2Name(selected));
			capture(selected);
		}
		avatar_menu = NULL_KEY;
	}

	// dialog timeout
	timer()
	{
		if (avatar_menu != NULL_KEY)
		{
			out(MSG_TIMEOUT);
			avatar_menu = NULL_KEY;
			llListenControl(dialog_handle, FALSE);
		}

		llSetTimerEvent(0);
	}

	changed(integer change) {
		if(change & CHANGED_LINK)
		{
			key id = llAvatarOnSitTarget();
			if (id != NULL_KEY)
			{
				avatar_victim = id;
				lock(avatar_victim);
				log ("sitting: " + llKey2Name(avatar_victim));
				state locked;
			}
		}
	}
}

state locked
{
	state_entry()
	{
		llListen(channel, "", NULL_KEY, "DIE");
		llSetTimerEvent(TIMER_LOCKED);
	}

	listen(integer channel, string name, key id, string message)
	{
		if (message == "DIE")
		{
			log ("DIE");
			release(avatar_victim);
		}
	}

	changed(integer change) {
		if(change & CHANGED_LINK)
		{
			key id = llAvatarOnSitTarget();
			if (id == NULL_KEY)
			{
				log ("unsitting " + llKey2Name(avatar_victim));
				release(avatar_victim);
				avatar_victim = id;
				state default;
			}
		}
	}

	timer()
	{
		release(avatar_victim);
	}
}
MLPV2 RLV Capture Plugin

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