Linedef type 313

Linedef type 313, No More Enemies – Once, is a type of linedef executor trigger which activates any linedef executor in the control sector once no more enemies (bosses included) exist within a specified area. The linedef executor will trigger only the first time, and then will not be triggered again until the map is reloaded. This effect is useful for creating areas where the player has to destroy all enemies to move on.

Setup

This trigger uses invisible, intangible FOFs (linedef type 223) to specify the area that is checked for enemies; it is only activated when no more Objects with the flag MF_ENEMY or MF_BOSS exist inside these FOFs.

Create a control sector outside of your map and give as many linedefs as you wish linedef type 223, and tag each one to a target sector you want to be scanned for the presence of enemies. Give this control sector an unused tag. Next, create another control sector and give one of its linedefs linedef type 313. Give this linedef the same tag as the control sector for the invisible, intangible FOFs. Any linedef executor effect you would like to be triggered should be applied to other linedefs on the control sector with linedef type 313. The game will go through the linedefs of the FOF control sector, checking inside the areas occupied by the FOFs to see if any enemies exist. The floor height and ceiling height of the FOF control sector indicate the floor and ceiling heights of the FOFs. If no enemies exist in any of the FOF areas, this linedef executor is run once.

Sample

Example file: ex_ld313_trigger_nomoreenemiesonce.wad (MAP01)

Play this map in Single Player mode.

How to use
You may load this file into your favorite map editor, such as Zone Builder. Select `MAP01` as the map to load. You may also load this file in the game: Save `ex_ld313_trigger_nomoreenemiesonce.wad` into the `addons` folder of your SRB2 directory. Start SRB2, go to the Addons menu, and then select `ex_ld313_trigger_nomoreenemiesonce.wad`. Start the game in Single Player mode. Press the Console button (`~`), and type in the command `MAP MAP01` to access the example map. When you load this file in the game, it replaces Greenflower Zone Act 1.

UDMF Setup

Unlike Binary, this trigger only requires a target sector to specify the area that is checked for enemies; it is only activated when no more Objects with the flag MF_ENEMY or MF_BOSS exist inside the sector(s).

Give your target sector an unused tag. Create a control sector outside of your map and give one of it's linedefs Linedef Type 313. Under Argument 1, "Target Sector Tag:", enter the Tag given to aforementioned target sector. The game will check the area inside the target sector, if no enemies exist in any of the FOF areas, this linedef executor is run once.

	Linedef types – Linedef executors	[view]
Triggers: Continuous • Each Time • Once • Ring Count (Continuous • Once) • Character Ability (Continuous • Each Time • Once) • Race Only – Once • CTF Red Team (Continuous • Each Time) • CTF Blue Team (Continuous • Each Time) • No More Enemies – Once • Number of Pushables (Continuous • Once) • Condition Set Trigger (Continuous • Once) • Unlockable (Continuous • Once) • Trigger After X Calls (Continuous • Each Time) • NiGHTSerize (Each Time • Once) • De-NiGHTSerize (Each Time • Once) • NiGHTS Lap (Each Time • Once) • Ideya Capture Touch (Each Time • Once) • Player Skin (Continuous • Each Time • Once) • Object Dye (Continuous • Each Time • Once) • Emerald Check (Continuous • Each Time • Once) • NiGHTS Mare (Continuous • Each Time • Once) • Gravity Check (Continuous • Each Time • Once) • Level Load

Actions:
Sector: Set Tagged Sector's Floor Height/Texture • Set Tagged Sector's Ceiling Height/Texture • Copy Light Level to Tagged Sectors • Set Tagged Sector's Flats • Change Tagged Sectors' Tag • Change Front Sector's Tag • Start Adjustable Flickering Light • Start Adjustable Pulsating Light • Start Adjustable Blinking Light (unsynchronized) • Start Adjustable Blinking Light (synchronized) • Fade Light Level • Stop Lighting Effect • Change Plane Scroller Direction • Set Tagged Sector's Light Level
Plane movement: Move Tagged Sector's Floor • Move Tagged Sector's Ceiling • Move Floor According to Front Texture Offsets • Move Ceiling According to Front Texture Offsets • Stop Plane Movement • Start Platform Movement • Crush Ceiling Once • Crush Floor Once • Crush Ceiling and Floor Once
Player/Object: Teleporter • Change Object State • Stop Object • Award Score • Enable/Disable 2D Mode • Enable/Disable Gravity Flip • Award Power-Up • Disable Player Control • Change Object Size • Change Object Type State • Enable Bosses with Parameter • Track Object's Angle • Stop Tracking Object's Angle • Award Rings • Spawn Object • Stop Timer/Exit Stage in Record Attack • Dye Object • Trigger Egg Capsule
Other: Change Music • Play Sound Effect • Run Script • Switch to Cut-Away View • Change Sky • Change Weather • Shatter FOF • Change Tagged Linedef's Textures • Start Metal Sonic Race • Condition Set Trigger • Call Lua Function • Earthquake • Make FOF Disappear/Reappear • Make FOF Crumble • Change Tagged Sector's Colormap • Change Skybox • Execute Linedef Executor (from Tag) • Execute Linedef Executor (Random Range) • Set FOF Translucency • Fade FOF • Stop Fading FOF • Fade Tagged Sector's Colormap • Stop Fading Tagged Sector's Colormap • Control Text Prompt • Toggle Level Fail
PolyObject: Door Slide • Door Swing • Move • Move, Override • Rotate Right • Rotate Right, Override • Rotate Left • Rotate Left, Override • Move by Waypoints • Turn Invisible, Intangible • Turn Visible, Tangible • Set Translucency • Fade Translucency