Routines
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D392: Highlight objects belonging to temp_wizard_number.
Used by the routines at routine21 and routine41.
Objects are inverted by printing solid block characters using the ROM print routine with OVER flag set.
highlight_objects D392 DI Disable interrupts and preserve registers.
D393 PUSH AF
D394 PUSH BC
D395 PUSH DE
D396 PUSH HL
D397 LD HL,map_object_table Set HL to address of map_object_table.
D39A LD B,$9F Set B to 195 as loop counter.
highlight_objects_loop D39C PUSH HL Preserve address and loop counter.
D39D PUSH BC
D39E LD A,(HL) If object number is zero jump to ignore_object.
D39F OR A
D3A0 JR Z,ignore_object
D3A2 LD DE,$0141 Else add $0141 to get corresponding entry in map_animation_frame_table.
D3A5 ADD HL,DE
D3A6 LD A,(HL) If animation frame is $04 (dead sprite) jump to ignore_object.
D3A7 CP $04
D3A9 JR Z,ignore_object
D3AB LD DE,$00A0 Else add $00A0 to get corresponding entry in map_object_properties_table.
D3AE ADD HL,DE
D3AF LD A,(HL) Read entry into A.
D3B0 LD DE,$01E1 Subtract $01E1 to get corresponding entry in map_object_table.
D3B3 SBC HL,DE
D3B5 AND $07 If low three bits (wizard number) of object properties equal temp_wizard_number jump to owner_matches.
D3B7 LD E,A
D3B8 LD A,(temp_wizard_number)
D3BB CP E
D3BC JR Z,owner_matches
ignore_object D3BE POP BC Restore loop counter and address in map_object_table.
D3BF POP HL
D3C0 INC HL Increment address and loop back to highlight_objects_loop for 160 iterations.
D3C1 DJNZ highlight_objects_loop
D3C3 POP HL Restore registers and return.
D3C4 POP DE
D3C5 POP BC
D3C6 POP AF
D3C7 RET
owner_matches D3C8 LD (temp_entry_pointer),HL Store address of object properties entry in temp_entry_pointer.
D3CB LD A,$02 Call CHAN-OPEN in ROM to set output channel to 2 (Screen).
D3CD CALL $1601
D3D0 CALL address_to_coordinate Convert address of entry to coordinates.
D3D3 LD A,$16 Use PRINT-A routine in ROM to print AT control code followed by coordinates H, L.
D3D5 RST $10
D3D6 LD A,H
D3D7 RST $10
D3D8 LD A,L
D3D9 RST $10
D3DA LD A,$8F Print filled block twice to invert pixels.
D3DC RST $10
D3DD LD A,$8F
D3DF RST $10
D3E0 LD A,$16 Print AT code followed by coordinates H+1, L.
D3E2 RST $10
D3E3 LD A,H
D3E4 INC A
D3E5 RST $10
D3E6 LD A,L
D3E7 RST $10
D3E8 LD A,$8F
D3EA RST $10 Print filled block twice to invert pixels.
D3EB LD A,$8F
D3ED RST $10
D3EE JR ignore_object Jump back to ignore_object.
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