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Routines |
| Prev: 28304 | Up: Map | Next: 28380 |
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Used by the routines at 28220 and 30890. Returns with C and B holding the lower and upper x-coordinates of the range within which the target character can see or be seen. This routine is called with DE holding either (a) the coordinates of a teacher (to determine where kids must be in order to get lines), or (b) the coordinates of a kid (to determine where a teacher must be in order to give lines).
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| 28327 | LD A,E | A=x (character's x-coordinate) | ||||||||
| 28328 | LD BC,24576 | B=96, C=0 (maximum and minimum bounds) | ||||||||
| 28331 | SUB 10 | Is the character's x-coordinate < 10? | ||||||||
| 28333 | JR C,28356 | Jump if so | ||||||||
| 28335 | LD C,A | C=x-10 | ||||||||
| 28336 | LD A,D | A=floor nearest to the character | ||||||||
| 28337 | CP 169 | Is the character nearest the bottom floor? | ||||||||
| 28339 | JR Z,28356 | Jump if so | ||||||||
| 28341 | CP 162 | Set the zero flag if the character is nearest the middle floor | ||||||||
| 28343 | LD A,38 | This is the x-coordinate of the Exam Room wall | ||||||||
| 28345 | JR Z,28349 | Jump if the character is nearest the middle floor | ||||||||
| 28347 | LD A,57 | This is the x-coordinate of the Map Room wall | ||||||||
| 28349 | CP C | Is the character more than 10 paces to the right of a wall? | ||||||||
| 28350 | JR C,28356 | Jump if so | ||||||||
| 28352 | CP E | Is the character to the left of a wall? | ||||||||
| 28353 | JR NC,28356 | Jump if so | ||||||||
| 28355 | LD C,A | C=x-coordinate of the wall that the character is within 10 paces to the right of | ||||||||
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Now C holds the lower x-coordinate of the visibility range. Time to calculate the upper x-coordinate.
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| 28356 | LD A,E | A=x (character's x-coordinate) | ||||||||
| 28357 | ADD A,10 | A=x+10 | ||||||||
| 28359 | CP B | Is the character within 10 paces of the far right wall? | ||||||||
| 28360 | RET NC | Return if so | ||||||||
| 28361 | LD B,A | B=x+10 | ||||||||
| 28362 | LD A,D | A=floor nearest to the character | ||||||||
| 28363 | CP 169 | Is the character nearest the bottom floor? | ||||||||
| 28365 | RET Z | Return if so | ||||||||
| 28366 | CP 162 | Set the zero flag if the character is nearest the middle floor | ||||||||
| 28368 | LD A,37 | This is the x-coordinate of the White Room wall | ||||||||
| 28370 | JR Z,28374 | Jump if the character is nearest the middle floor | ||||||||
| 28372 | LD A,56 | This is the x-coordinate of the Reading Room wall | ||||||||
| 28374 | CP B | Is the character more than 10 paces to the left of a wall? | ||||||||
| 28375 | RET NC | Return if so | ||||||||
| 28376 | CP E | Is the character to the right of a wall? | ||||||||
| 28377 | RET C | Return if so | ||||||||
| 28378 | LD B,A | B=x-coordinate of the wall | ||||||||
| 28379 | RET | |||||||||
| Prev: 28304 | Up: Map | Next: 28380 |