Wind-waker style stealth.
Guard NPC script: trapezoidal line-of-sight, with variable sight angle and distance. Follows a path of flags.
Spotlight FFC script: circular light, with variable radius. Can be set up to move with changers.
Spawn NPC ffc script: Spawn an NPC at the FFC's location, and set it's direction

Barrel FFC script, that you can hide in, which also uses an item script.

Test quest (showcased in video) included in download.

V1.0 (24-Jun-2019) - Initial Release
V1.0.1 (03-Jul-2019) - Update EmilyMisc.zh requirement

Headers: EmilyMisc.zh (v1.3 or higher), ffcscript.zh, std.zh

1. Set up constants in the script, as follows. Any which list a default will work fine at their default value.
BARREL_ITEM (must be manually set!): ID of the item which will be used to run the barrel item script
DRAW_LAYER (default 6): layer to draw the spotlight/npc line of sight on
DRAW_OPACITY (default OP_TRANS): the opacity to draw the line of sight/spotlight in
WARP_SFX (default 0): The SFX to play when warping.
WARP_FLAGS (default 0): The set of flags to use for WarpEx - use `WARP_FLAG_` constants from std.zh.
CAUGHT_SFX (default 0): The SFX to play when you are noticed

2. Set up the passive item script:
For the item you set to BARREL_ITEM,
Make sure `Equipment Item` is checked. The Item Class should be a `Custom ItemClass ##` class.
Under `Flags`, check `Constant Script`
Set an LTM, and create associated graphics, to make the hero look like he's walking while under a barrel.
Assign the "Action Script" as `barrelItem`
Set parameters-
D0: If 0, barrel can only be placed on walkable areas. Else, ignores solidity.
D1: If 0, all graphics are handled by the link tile modifier. If 1, the barrel combo will be drawn over link when he is hiding.
* Note: the walking tiles still need to be handled by the LTM.
Set QR- `ZScript->Quest Script Settings->Item Scripts Run for Multiple Frames` must be checked

3. Set up patrol enemies!
Place the enemy using an inherent enemy placement flag, on a path of placed flags (of any type, preferrably a scripted flag)
* Or, spawn the enemy using a script, on a placed path of flags (instead of using an inherent placement flag).
* * The included `ffc script enemyPlacement` can be used for this.
* It will follow these flags in a path, and if it sees Hero, it will play a cutscene of running towards him and then jail him.
* The enemy will ignore all solidity, to follow this path.
D0: The color to use to draw the line of sight. Use `0` for no drawing.
D1: DMap to warp to
D2: Screen to warp to
D3: Warp return square to use. 0-3 for A-D, -1 for pit warp
D4: Forward sight range, in pixels
D5: Forward sight angle (between 0 and 90, inclusive. 0/1 are tunnel vision, 89/90 are wide vision). Recommended: 45.
D6: If 0, will prefer clockwise movement at turns, else, counterclockwise.
D7: Flag to follow. If 0, uses placed flag being stood on. Reading `npc->InitD[7]` will tell you what flag is being used.

Enemy Editor data:
* Enemy type should be "Other"
* Step speed will be used for the movement
* Defenses should ALL be set to "Block", unless you want the guard to be killable of course.
* If you set it to be unkillable, be sure to set "Doesn't count as beatable enemy"
* Homing Factor / Halt Rate / Random Rate / Hunger are totally ignored.
* Damage will be forcibly set to 0. Weapon damage is unaffected.

Set QR: `ZScript->Quest Script Settings->Sprite Coordinates are Float` must be checked

4. Placing barrels
Place an FFC, and set the script to `hidableBarrel`.
Set the combo to look like a barrel, should look similar to the graphics used for your LTM.
...That's it. Barrel done.

5. Placing Spotlights
Place an FFC, and set the script to `spotlight`.
Set the combo to something invisible.
Set parameters:

D0: The color to use to draw the spotlight. Use `0` for no drawing.
D1: DMap to warp to
D2: Screen to warp to
D3: Warp return square to use. 0-3 for A-D, -1 for pit warp
D4: Radius of circle, from center of FFC, to be a spotlight.

Movement: You can set this up using default FFC movement, and changers. No scripted movement is provided.

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If you are confused with any part of this setup, reference the test quest included with the package. It includes various situations that can be set up using these scripts.