Routines
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29578: Check whether Sam or a gangster is inside a region
Used by the routines at 29597 and 31362. On entry, HL points at the first or second entry in a table of region definitions (at 64780, 64806, 64836, 64868 or 64892) used by a gangster who is on the lookout for Sam. On exit, the carry flag is set if Sam or the gangster is outside the region.
Input
D Gangster's character number (215-224), or 230 (Sam)
HL Address of a region definition
29578 LD E,1 A=Sam's or the gangster's x-coordinate
29580 LD A,(DE)
29581 CP (HL) Is Sam or the gangster to the left of the region?
29582 RET C Return with the carry flag set if so
29583 INC HL Point HL at the upper x-coordinate
29584 CP (HL) Is Sam or the gangster to the right of the region?
29585 CCF Return with the carry flag set if so
29586 RET C
29587 INC HL Point HL at the lower y-coordinate
29588 INC E A=Sam's or the gangster's y-coordinate
29589 LD A,(DE)
29590 CP (HL) Is Sam or the gangster above the region?
29591 RET C Return with the carry flag set if so
29592 INC HL Point HL at the upper y-coordinate
29593 CP (HL) Compare it with Sam's or the gangster's y-coordinate
29594 INC HL Point HL at either the disguise ID, or the first byte of the second entry in the table of region definitions
29595 CCF Set the carry flag if Sam or the gangster is below the region
29596 RET
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