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Routines |
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The handler for entity types 96 to 99, which are enemies that hunt for the robot. The enemy heads for the robot, and chooses a new direction when it is blocked.
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| MoveHunter | 42220 | CALL ToggleSprite | Move on to the next sprite using ToggleSprite. | |||||
| 42223 | CALL RemoveDistantEntity | Remove the enemy if it is far away from the camera using RemoveDistantEntity. | ||||||
| 42226 | CALL GetPosition | Fetch the position of the enemy. | ||||||
| 42229 | LD B,64 | The enemy can take up to 64 steps in this frame. | ||||||
| MoveHunter_Step | 42231 | CALL TryMove | Take a step using TryMove. | |||||
| 42234 | JR NZ,MoveHunter_Blocked | Jump if the enemy has been blocked by a cell. | ||||||
| 42236 | CALL CheckEnemyOverlap | Check whether another enemy is in the way using CheckEnemyOverlap. | ||||||
| 42239 | JR C,MoveHunter_Reverse | Jump if there is. | ||||||
| 42241 | LD A,E | Jump if the enemy is not at the start of a cell. | ||||||
| 42242 | OR L | |||||||
| 42243 | JR NZ,MoveHunter_Store | |||||||
| 42245 | CALL FindDirectionToRobot | Choose a direction towards the robot using FindDirectionToRobot... | ||||||
| 42248 | LD (IX+7),A | ...and store it. | ||||||
| 42251 | LD A,B | Loop back to take another step if there are steps left. | ||||||
| 42252 | AND A | |||||||
| 42253 | JR NZ,MoveHunter_Step | |||||||
| MoveHunter_Store | 42255 | CALL SetPosition | Store the new position of the enemy. | |||||
| 42258 | CALL FaceEnemy | Face the enemy in the direction that it is heading using FaceEnemy. | ||||||
| 42261 | JP AddEntity | Draw the enemy using AddEntity. | ||||||
| MoveHunter_Blocked | 42264 | PUSH HL | Save the Y position. | |||||
| 42265 | LD HL,(38446) | Fetch the address of the cell that blocked the enemy... | ||||||
| 42268 | LD A,(HL) | ...and its type. | ||||||
| 42269 | AND 15 | Keep the current type of the cell. | ||||||
| 42271 | JR MoveHunter_Turn | Jump to choose a direction. | ||||||
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This code is never run. It would have let the enemy pick up programs, like MoveThief.
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| MoveHunter_Unused | 42273 | CP 6 | Jump to pick up the item if the cell is type 6... | |||||
| 42275 | JR Z,MoveHunter_Unused_Pick | |||||||
| 42277 | CP 7 | ...or type 7. | ||||||
| 42279 | JR NZ,MoveHunter_Turn | |||||||
| MoveHunter_Unused_Pick | 42281 | LD B,A | Keep the type. | |||||
| 42282 | LD A,(IX+8) | Fetch the item that the enemy is carrying. | ||||||
| 42285 | AND A | Jump if it is carrying one already. | ||||||
| 42286 | JR NZ,MoveHunter_Turn | |||||||
| 42288 | LD (IX+8),B | Store the item that it has picked up. | ||||||
| 42291 | CALL EmptyCell | Remove it from the cell using EmptyCell. | ||||||
| 42294 | POP HL | Restore the Y position. | ||||||
| 42295 | JR MoveHunter_Store | Carry on. | ||||||
| MoveHunter_Turn | 42297 | POP HL | Restore the Y position. | |||||
| 42298 | CALL FindDirectionToRobot | Choose a direction towards the robot using FindDirectionToRobot... | ||||||
| 42301 | LD (IX+7),A | ...and store it. | ||||||
| 42304 | JP AddEntity | Draw the enemy using AddEntity. | ||||||
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The enemy is in the way of another enemy.
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| MoveHunter_Reverse | 42307 | CALL ReverseDirection | Turn the enemy round using ReverseDirection. | |||||
| 42310 | CALL FaceEnemy | Face the enemy in the direction that it is heading using FaceEnemy. | ||||||
| 42313 | CALL AddEntity | Draw the enemy using AddEntity. | ||||||
| 42316 | RET NC | Return if it was not drawn. | ||||||
| 42317 | JP MakeBumpSound | Otherwise make a sound using MakeBumpSound. | ||||||
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