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Routines |
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The handler for entity types 10 to 13 and 18 to 1B, which are the robot when it is heading in direction zero or two (across the map).
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| MoveRobotHorizontally | AB03 | SET 7,(IX+$00) | Show the sprite flipped. | |||||
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This entry point is used by the routine at MoveRobotVertically.
This entry point is shared by both handlers. It does all of the work for the robot in a frame: it looks at the action key, shows the robot on the map, works out how far to move, moves the robot, checks whether it has hit an enemy and fires the weapons.
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| UpdateRobot | AB07 | CALL UseActionKey | Deal with the action key using UseActionKey. | |||||
| AB0A | CALL UpdateRobotMarker | Update the position of the robot on the map of the sectors using UpdateRobotMarker. | ||||||
| AB0D | CALL GetRobotSpeed | Find how far the robot can move using GetRobotSpeed. | ||||||
| AB10 | LD A,(IX+$06) | Fetch the speed of the robot... | ||||||
| AB13 | AND $F0 | ...and move on to the next sprite using NextSpriteNumber if the robot is moving fast enough. | ||||||
| AB15 | CALL NZ,NextSpriteNumber | |||||||
| AB18 | CALL MoveRobot | Move the robot using MoveRobot. | ||||||
| AB1B | LD A,(IX+$00) | Fetch the type of the robot... | ||||||
| AB1E | EX AF,AF' | ...and keep it in A'. | ||||||
| AB1F | CALL CheckShotHit | Check whether the robot has hit an enemy using CheckShotHit. | ||||||
| AB22 | LD A,(IX+$00) | Fetch the type of the robot again. | ||||||
| AB25 | CP $38 | Jump if it has not been turned into smoke. | ||||||
| AB27 | JR NZ,MoveRobotHorizontally_ReadControls | |||||||
| AB29 | LD A,($965A) | Fetch the number of sectors that have been dealt with. | ||||||
| AB2C | ADD A,$1A | Add 1A to get the energy that the collision costs... | ||||||
| AB2E | LD B,A | ...and keep it in B. | ||||||
| AB2F | LD A,($963B) | Fetch the energy of the battery. | ||||||
| AB32 | SUB B | Take off the cost. | ||||||
| AB33 | JR C,MoveRobotHorizontally_NoEnergy | Jump if there is not enough energy. | ||||||
| AB35 | EX AF,AF' | Otherwise get the type that the robot had... | ||||||
| AB36 | LD (IX+$00),A | ...and restore it, so that it is not destroyed... | ||||||
| AB39 | EX AF,AF' | Switch back to the energy. | ||||||
| AB3A | JR UpdateRobot_Store | ...and jump to store the energy. | ||||||
| MoveRobotHorizontally_NoEnergy | AB3C | CALL ExplodeEnemies | The battery is empty, so turn all of the enemies into smoke using ExplodeEnemies. | |||||
| AB3F | XOR A | Set the energy to zero. | ||||||
| UpdateRobot_Store | AB40 | LD ($963B),A | Store the energy of the battery. | |||||
| MoveRobotHorizontally_ReadControls | AB43 | LD A,($9625) | Fetch the controls. | |||||
| AB46 | BIT 3,A | Jump if the second weapon is not being fired. | ||||||
| AB48 | JR Z,MoveRobotHorizontally_FirstWeapon | |||||||
| AB4A | CALL FireWeaponB | Fire the second weapon using FireWeaponB. | ||||||
| AB4D | JR UpdateRobot_Draw | Jump to draw the robot. | ||||||
| MoveRobotHorizontally_FirstWeapon | AB4F | BIT 4,A | Fire the first weapon using FireWeaponA if it is being fired. | |||||
| AB51 | CALL NZ,FireWeaponA | |||||||
| UpdateRobot_Draw | AB54 | JP AddEntity | Draw the robot using AddEntity. | |||||
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