Routines
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BDDE: Draw a sprite several times in a line
Used by the routines at DISPLAY_PANEL and PRINT_BORDER.
Used to build the border and the panel out of repeated pieces. As Knight Lore's multiple_print_sprite.
Input
IX the record, loaded by TRANSFER_SPRITE
B how many times
E the step in x between copies
D the step in y between copies
MULTIPLE_PRINT_SPRITE BDDE PUSH BC draw it, keeping the registers
BDDF PUSH DE
BDE0 PUSH HL
BDE1 CALL DRAW_SPRITE
BDE4 POP HL
BDE5 POP DE
BDE6 POP BC
BDE7 LD A,(IX+$1A) move the record's x by E and y by D
BDEA ADD A,E
BDEB LD (IX+$1A),A
BDEE LD A,(IX+$1B)
BDF1 ADD A,D
BDF2 LD (IX+$1B),A
BDF5 DJNZ MULTIPLE_PRINT_SPRITE and again
BDF7 RET
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