Routines
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B399: Collect Overlapping Item
Used by the routine at DrawItems.
Adds the entity in IX to the table of overlapping items that is being built by DrawItems. Four bytes are stored: the screen position from fields 0E and 0F the width from field 16 (times eight) and the height from field 17.
Input
IX The entity
HL' Pointer to the next free entry in the table
C' The number of entries
Output
HL' Updated pointer
CollectOverlappingItem B399 EXX Keep the table pointer aside.
B39A LD E,(IX+$0E) The column and the row.
B39D LD D,(IX+$0F)
B3A0 LD A,(IX+$16) The width, times eight.
B3A3 LD B,(IX+$17)
B3A6 AND $0F
B3A8 ADD A,A
B3A9 ADD A,A
B3AA ADD A,A
B3AB LD (HL),E Write the column, the row and the width.
B3AC INC HL
B3AD LD (HL),D
B3AE INC HL
B3AF LD (HL),A
B3B0 INC HL
B3B1 LD A,B The height, without the shape flags.
B3B2 AND $3F
B3B4 LD (HL),A
B3B5 INC HL
B3B6 INC C Count this item.
B3B7 EXX Bring the table pointer back.
B3B8 RET Return.
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