Routines
Prev: 54191 Up: Map Next: 54462
54368: Goldfish Game: Print Sprite
Used by the routines at GoldfishGame_Collision, GoldfishGame_EraseSprite and GoldfishGame_PrintBoats.
Input
A Sprite ID (where to begin)
BC Print co-ordinates
D Sprite height
E Sprite width
GoldfishGame_PrintSprite 54368 PUSH HL Preserve HL on the stack as it's not actively used.
Store the Sprite ID. Note; it is incremented on each UDG character block being printed (see GoldfishGame_PrintSprite_PrintUDG), hence why it's -1 here.
54369 DEC A Decrease the Spite ID by one and store it at *GoldfishGame_TempSpriteID.
54370 LD (56124),A
54373 LD A,E Store the Sprite width at *GoldfishGame_TempSpriteWidth.
54374 LD (56123),A
Ensure that we're printing within the screen boundaries.
GoldfishGame_PrintSprite_Loop 54377 LD A,C Jump to GoldfishGame_PrintSprite_Return if C is lower than 2.
54378 CP 2
54380 JP C,GoldfishGame_PrintSprite_Return
54383 LD A,(56123) E=*GoldfishGame_TempSpriteWidth.
54386 LD E,A
54387 LD A,C Jump to GoldfishGame_FindViewableSprite if C is higher than 34.
54388 CP 34
54390 JP NC,GoldfishGame_FindViewableSprite
GoldfishGame_PrintSprite_At 54393 PUSH BC Stash the print co-ordinates and the sprite height/ width on the stack.
54394 PUSH DE
Set the current printing location.
54395 CALL 3545 Call CL_SET.
54398 POP DE Restore the sprite height/ width from the stack, they're used here as loop counters.
Action this sprite ID (+1 and print it to the screen buffer).
GoldfishGame_PrintSprite_PrintUDG 54399 LD A,(56124) Increment *GoldfishGame_TempSpriteID by one.
54402 INC A
54403 LD (56124),A
54406 CALL GoldfishGame_PrintColourUDG Call GoldfishGame_PrintColourUDG.
54409 LD A,C Call GoldfishGame_PrintSprite_0 if C is equal to 2.
54410 CP 2
54412 CALL Z,GoldfishGame_PrintSprite_0
Keep track of where we're printing to on the screen.
54415 DEC C Move right one character block.
54416 DEC E Decrease the sprite width counter by one.
54417 JR NZ,GoldfishGame_PrintSprite_PrintUDG Jump to GoldfishGame_PrintSprite_PrintUDG until the sprite width counter is zero.
A row of the sprite has been printed, so restore the screen position and move onto the next line.
54419 POP BC Restore the current print co-ordinates from the stack.
54420 DEC D Decrease the sprite height counter by one.
54421 JR Z,GoldfishGame_PrintSprite_Return Jump to GoldfishGame_PrintSprite_Return if the whole sprite has now finished printing.
54423 DEC B Move down one row.
54424 JR GoldfishGame_PrintSprite_Loop Jump to GoldfishGame_PrintSprite_Loop.
Housekeeping, and return.
GoldfishGame_PrintSprite_Return 54426 POP HL Restore HL from the stack.
54427 RET Return.
GoldfishGame_PrintSprite_0 54428 DEC E Decrease E by one.
54429 PUSH AF Stash AF on the stack.
54430 INC E Increment E by one.
54431 LD A,(56124) Increment *GoldfishGame_TempSpriteID by one.
54434 INC A
54435 LD (56124),A
54438 POP AF Restore AF from the stack.
54439 RET Z Return if A is zero.
54440 DEC E Decrease E by one.
54441 JR GoldfishGame_PrintSprite_0 Jump to GoldfishGame_PrintSprite_0.
Try to discover the printable part of the sprite.
GoldfishGame_FindViewableSprite 54443 LD A,(56124) Increment *GoldfishGame_TempSpriteID by one.
54446 INC A
54447 LD (56124),A
54450 DEC E Decrease the sprite width counter by one.
54451 JP Z,GoldfishGame_PrintSprite_Return Jump to GoldfishGame_PrintSprite_Return if the sprite width counter is zero.
54454 DEC C Move right one character block.
54455 LD A,C Jump to GoldfishGame_PrintSprite_At if C is higher than 34.
54456 CP 34
54458 JR NC,GoldfishGame_PrintSprite_At
54460 JR GoldfishGame_FindViewableSprite Keep looping back to GoldfishGame_FindViewableSprite until we either return if this is invalid, or find a printable part of the sprite.
Prev: 54191 Up: Map Next: 54462