Routines
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C0D4: Can this thing be picked up?
Used by the routine at TAKE_OR_LEAVE.
Only the bucket (graphic 90) and the collectables (144 to 148), and only when he is on or beside it: their boxes overlap in U and V, and in Z with him lowered by 4, so that a thing he stands on counts as touching. The caller has made his box 4 bigger each way. Knight Lore's can_pickup_spec_obj and is_on_or_near_obj together.
Input
IX the player's legs
IY the thing
Output
F carry set if it can
CAN_PICK_UP C0D4 LD A,(IY+$00) the bucket, or graphic 144 to 148; otherwise no carry
C0D7 CP $5A
C0D9 JR Z,CAN_PICK_UP_0
C0DB SUB $90
C0DD CP $05
C0DF RET NC
CAN_PICK_UP_0 C0E0 PUSH BC overlapping in U and V, with no offset
C0E1 LD BC,$0000
C0E4 LD L,C
C0E5 LD H,C
C0E6 CALL DO_OBJS_INTERSECT_ON_U
C0E9 JR NC,CAN_PICK_UP_1
C0EB CALL DO_OBJS_INTERSECT_ON_V
C0EE JR NC,CAN_PICK_UP_1
C0F0 LD A,(IX+$03) in Z, with him 4 lower, then put back
C0F3 SUB $04
C0F5 LD (IX+$03),A
C0F8 CALL DO_OBJS_INTERSECT_ON_Z
C0FB PUSH AF
C0FC LD A,(IX+$03)
C0FF ADD A,$04
C101 LD (IX+$03),A
C104 POP AF
CAN_PICK_UP_1 C105 POP BC
C106 RET
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