Sprite: Difference between revisions

! Offset !! Length !! [[Data types|Type]] !! Description

| 0x08 || 4 || optional pointer32 || Pointer to sprite tile data

! Offset !! Length !! [[Data types|Type]] !! Description

! Offset !! Length !! [[Data types|Type]] !! Description

The sprite graphics are located at [[$84:8000]] and each 16x16 tile is 0x80 bytes long, so the address of the graphics for a given tile number can be calculated as "0x20000 + TileNumber * 0x80".

! Type !! Description !! Solid to<br />players !! Solid to<br />monsters

| 0x0000 || None. Sprites set to this type will have no collision. || ||

| 0x0001 || Victim || || ✓

| 0x0002 || Monster that does no damage || || ✓

| 0x00110x000C || [[BazookaSquirt gun]] [[item pickup]] || ||

| 0x00120x000D || [[SodaFire pop cansextinguisher]] item pickup || ||

| 0x00130x000E || [[TomatoesMartian bubble gun]] item pickup || ||

| 0x00140x000F || [[Ice popsWeed-eater]] item pickup || ||

| 0x00150x0010 || [[BananasAncient artifact]] item pickup || ||

| 0x00160x0011 || [[PlateBazooka]] item pickup || ||

| 0x00170x0012 || [[SilverwareSoda pop cans]] item pickup || ||

| 0x00180x0013 || [[FootballTomatoes]] item pickup || ||

| 0x00190x0014 || [[FlamethrowerIce pops]] item pickup || ||

| 0x0021 || [[Key]] item pickup || ||

| 0x00220x0026 || [[SpeedGrey shoespotion]] item pickup || ||

| 0x00230x0027 || [[Monster potionHamburger]] item pickup || ||

| 0x00240x0028 || [[GhostFirst kidaid potionkit]] item pickup || ||

| 0x00250x0029 || [[RandomPandora's potionbox]] item pickup || ||

| 0x00260x002A || [[GreySkeleton potionkey]] item pickup || ||

| 0x00270x002B || [[HamburgerDecoys]] item pickup || ||

| 0x00280x002C || [[FirstPile aidof kitkeys]] item|| || pickup

| 0x00290x002D || [[Pandora'sSecret boxitem]] item|| || pickup

| 0x002A0x002E || [[Skeleton key1up]] item|| || pickup

| 0x002B0x002F || [[DecoysGold]] item|| || pickup

| 0x002C0x0030 || [[PileDollar of keysbills]] || ||

| 0x002D0x0031 || [[SecretUnused item]] pickup type || ||

| 0x00300x0034 || [[DollarJelly billsblob]] shot || ✓ || ✓

| 0x00320x0036 || UnusedFrozen itemmonster pickup|| ✓ || type✓

| 0x0040 || Victim insta-killer used by [[Debug.asm]] || ||

| 0x005C || [[Squirt gun]] shot from Zeke || || ✓

| 0x005D || [[Fire extinguisher]] shot from Zeke || || ✓

| 0x005E || [[Martian bubble gun]] shot from Zeke || || ✓

| 0x005F || [[Weed-eater]] shot from Zeke || || ✓

| 0x0060 || [[Ancient artifact]] shot from Zeke/invincible after dying damage from Zeke || || ✓

| 0x0061 || [[Bazooka]] shot from Zeke || || ✓

| 0x0062 || [[Soda pop cans]]/[[Flamethrower]] shot from Zeke || || ✓

| 0x0063 || [[Tomatoes]] shot from Zeke || || ✓

| 0x0064 || [[Ice pops]]/[[Bananas]] shot from Zeke || || ✓

| 0x0065 || Unused, but damages [[fire]] || || ✓

| 0x0066 || [[Plate]] shot from Zeke || || ✓

| 0x0067 || [[Silverware]] shot from Zeke || || ✓

| 0x0068 || [[Football]] shot from Zeke || || ✓

| 0x0069 || Pop-up wall || || ✓

| 0x006A || Unused weapon shot type || || ✓

| 0x006B || Unused weapon shot type || || ✓

| 0x006C || Unused weapon shot type || || ✓

| 0x006D || Unused weapon shot type || || ✓

| 0x006E || Unused weapon shot type || || ✓

| 0x006F || [[Pandora's box]] shot from Zeke || || ✓

| 0x0070 || [[Monster potion]] punch from Zeke || || ✓

| 0x00FF || SpriteOne-shot monster/victim went off screen || ||

[[Entity|Entities]] can call [[$80:8475]] to set a collision handler for the sprites they own. When a sprite collides with another sprite, the collision handler of the parent entity of each sprite is called, with the type of the sprite it collided with provided in the accumulator. In addition, [[$7E:0076]] and [[$7E:0078]] can be used to access the two sprites involved in the collision. The collision handlers are set per entity, so even if an entity has multiple sprites, they must share the same collision handler. Collision handlers are run outside the context of the entity, so [[$80:8353]] cannot be called to wait. However, the direct page will be set to the entity memory, so data from there can be accessed.

Sprites are considered collided if their X and Y positions are both less than 8 pixels apart, they are both on-screen (meaning they must be visible), they both have non-zero sprite type, and they have different sprite types. Collision can also triggered over an arbitrary area by calling [[$80:BF1B]]. The same restrictions on sprite type apply to this as well.

Certain sprite types are considered solid. That is, players andor monsters will not be able to move through them. Sprite types that are solid are highlightedshown in the [[#Sprite types|sprite type]] table above. In addition, types 0x39 through 0x5B are solid to both players and monsters, and types 0x71 and greater are solid to monsters, but these types are not used in the original game.

Solid sprites are implemented in a different way from normal sprite collision. An entity must manually call [[$80:BFC8]] to check if a given position is overlappingsolid to players, or [[$80:BF67]] to check if a position is solid spriteto monsters.