Routines
Prev: D4CC Up: Map Next: D51A
D4EF: Check Object Match Criteria
Used by the routines at CountObjectsInLocation and FindMatchingObject.
Sets the carry when the object matches the id, the location and the remaining checks. Returns with the carry clear when any check fails.
Input
A Object ID
B Location ID
Output
F Carry flag set if object matches all criteria (location, visibility, type, etc.)
CheckObjectMatchCriteria D4EF CP (IY+$01) Go to CheckObjectMatchCriteria_NoMatch if the object id does not match.
D4F2 JR NZ,CheckObjectMatchCriteria_NoMatch
D4F4 LD A,($A036) Go to CheckObjectMatchCriteria_NoMatch if the object is the character being processed.
D4F7 CP (IX+$00)
D4FA JR Z,CheckObjectMatchCriteria_NoMatch
D4FC LD A,(IX+$00) Go to CheckObjectMatchCriteria_NoMatch if the object is not in this location.
D4FF CALL CheckObjectLocationMatch
D502 JR Z,CheckObjectMatchCriteria_NoMatch
D504 LD A,(IY+$00) Jump to CheckObjectMatchCriteria_NoMatch if the character id is at least 02.
D507 CP $02
D509 JR NC,CheckObjectMatchCriteria_NoMatch
Perform final validation check.
D50B LD A,($A036) Read the current character.
D50E PUSH IX
D510 POP HL
D511 CALL $D278 Call D278 to perform an additional validation check.
D514 JR C,CheckObjectMatchCriteria_NoMatch Go to CheckObjectMatchCriteria_NoMatch if D278 sets the carry.
All checks passed - object matches the criteria.
D516 SCF Mark the condition as met.
D517 RET Return.
Clear the carry so an object that failed the checks returns as no match.
Object doesn't match any criteria.
CheckObjectMatchCriteria_NoMatch D518 AND A Clear the carry before returning the failed object match.
D519 RET Return.
Prev: D4CC Up: Map Next: D51A