While playing quests that feature custom bosses (especially ghosted ones), I was annoyed by one quite maddening fact: you can`t know how how many HP the boss still has left! Especially annoying when you are low on HP and have a dilemma: should you just drink valuable potion for a chance of finishing off that nasty monster, or hit F6 and restart. Even more annoying with bosses that require limited resources, like bombs or arrows, to defeat. I have seen a Z2-styled boss HP meter script, but it has hardcoded indicator setup and can`t be adapted to suit any other tileset beyond Classic.

So I have created my own version of boss health meter that pretty much mimicks Link`s one in the passive subscreen.

Update: Added an arguments to set font for boss name drawing and to alter boss HP meter`s Y position.

Update #2 Added ability to draw customizable background beneath Boss HP gauge.
Also added possibility to hide boss HP meter until Link obtains specific item.
Credit goes to Gege for suggesting this feature as well as providing the screen shot.

Update #3 Added intro string, Megaman-like intro HP generation and multi-row carryover for OP bosses on request by SkyFlare. It`s recommended to do full set up from scratch to update your quests to new version of this script.

Update #4: Added option to cuatomize left and right caps for boss HP meter. See new constant in script file.

Update#5. Added cursed Logarithmic boss HP meter variant, renders fewer HP than boss actually has. Refactored backdrop drawing.

Requires std.zh and string.zh.

1. Set up 5 consecutive tiles in a row in Tile Editor as following:
1. Full heart.
2. 3/4 heart.
3. 1/2 heart.
4. 1/4 heart.
5. Empty heart.
2. Note down ID of the first tile in the row (the "Full Heart" one).
A. Set up 3*3 frame for Boss HP meter background, if you want one.
3. Import and compile the script.
4. In your boss screen, place the invisible FFC, one for each boss, if multiple bosses are in one screen, and assign the following arguments:
X and Y position: Position of HP meter.
CSet - Cset used for drawing the life gauge. Setting value to 0 results in health meter flashing trough all csets.
D0: ID of the tile you noted down in step 2.
D1: Slot number of the boss enemy, or his weak spot.
D2: Hit Points per tile. Larger values means smaller life meter and vise versa.
D3: Tile, top left of 3*3 frame, used to render background. 0 to disable.
D4: Quake power on boss introdiction. Best used for jump scares.
D5: >0 - Logarithmic boss HP meter. Rendered HP is smaller than actual boss HP. A very cuesed and deceiving way to make player waste potions in very hard boss battles.
D6: Maximum tiles in row before carrying over to nex one. Recommended to be even one.
D7: String to display at the start of the battle.
Otherwise, it sets Y position of boss health gauge.
5. Assign the script to FFC.
6. Test and enjoy.