Routines
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53714: Check tunnel item type for collision checks and movement (boundary, bats and spiders)
Used by the routine at 51359.
Check for collisions with all tunnel objects (left/right boundary, bats or spiders).
  • Collision with a boundary wall drains Maroc's energy by 1 point
  • Collision with a spider or bat drains Maroc's energy by 16 points
53714 LD A,(60238) Object properties byte
53717 AND 1 Bit 1 indicates if the item is visible on-screen
53719 JR Z,53787 If not, skip the rest of this routine
Check what tunnel object we're dealing with:
53721 LD A,(60230) Tunnel boundary wall type. 1 = right, 2 = left
53724 CP 1
53726 JR Z,53819 Right boundary wall check
53728 CP 2
53730 JR Z,53840 Left boundary wall check
If it's not a right/left boundary wall, the item must be a creature - spider or bat.
In which case, run a collision check with Maroc and reduce his energy if a collision is detected.
53732 LD A,2 Set the counter/length/frequency used for the generic sound effect routine at 49274 as spiders and bats make a scuttling/flapping sound as they move down the tunnel
53734 LD (60246),A
53737 LD C,0 Collision/event type to check - 0 = Collision with Maroc
53739 CALL 57293 Run event/collision check
53742 CP 0 The A register is returned with 1 = Collision, 0 = No collision
53744 JR Z,53751
53746 LD A,16 If there's a collision...
53748 CALL 58316 ...Reduce Maroc's energy (by 16)
Creature movement
53751 LD A,(60230) Creature type. 4 = Spider, 8 = Bat
53754 CP 8 Is it a bat?
53756 JP NZ,53885 If not, jump to spider movement
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