Routines
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681C: Print Lives
Used by the routines at PrintHeader, Handler_BulletCollisionEffects, Handler_LevelComplete and Handler_AlienExplosions.
PrintLives 681C LD DE,$4008 Set the screen buffer position to 4008 (where the life icons start being displayed).
681F LD A,($66F0) Load the number of lives from *Player_Lives, subtract one and store the result in C.
6822 DEC A
6823 LD C,A
6824 LD B,$05 Set a counter in B for 05 icon positions.
PrintLives_Loop 6826 DEC C Decrease the lives counter by one.
6827 PUSH BC Stash the loop counters and screen buffer position on the stack.
6828 PUSH DE
6829 LD A,$05 Jump to PrintLifeIcon if the position should show a life icon.
682B CP C
682C JR NC,PrintLifeIcon
682E LD HL,$613D Point HL to the blank mask graphic at Graphics_Masks.
6831 JR PrintLives_DrawIcon Jump to PrintLives_DrawIcon.
Print a "life" icon.
udg24614_66x4
PrintLifeIcon 6833 LD HL,$6026 HL=Graphics_LivesIcon.
PrintLives_DrawIcon 6836 LD B,$08 Set a line counter in B (08 lines in a UDG).
PrintLives_LineLoop 6838 LD A,(HL) Copy the UDG data to the screen buffer.
6839 LD (DE),A
683A INC HL Move to the next UDG graphic data byte.
683B INC D Move down one pixel line in the screen buffer.
683C DJNZ PrintLives_LineLoop Decrease the line counter by one and loop back to PrintLives_LineLoop until all 08 lines of the UDG character have been drawn.
683E POP DE Restore the original screen buffer position from the stack.
683F INC DE Move right two character blocks, ready for printing the next life icon.
6840 INC DE
6841 POP BC Restore the lives counter from the stack.
6842 DJNZ PrintLives_Loop Decrease the lives counter by one and loop back to PrintLives_Loop until all the remaining lives have an icon displayed in the header.
6844 RET Return.
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