Routines
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8CBC: Handler: Jetman Walk
Jetman is walking on the ground. Keep him walking while there is ground beneath him, or launch him if UP is pressed or the ground ends.
Input
IX Actor slot
Set the vertical thrust first. F0 is a signed -10 upward thrust.
Handler_JetmanWalk 8CBC LD (IX+$06),$F0 Write F0 to *IX+06.
8CC0 CALL HandlerControls Call HandlerControls.
8CC3 BIT 3,A Jump to LaunchJetman if UP is pressed.
8CC5 JP Z,LaunchJetman
Keep walking if there is ground under Jetman, otherwise launch.
8CC8 CALL ReadTerrainCell Call ReadTerrainCell.
8CCB LD A,D Jump to LaunchJetman if there is no terrain under Jetman.
8CCC AND A
8CCD JP Z,LaunchJetman
8CD0 LD A,E Jump to LaunchJetman if the cell beside Jetman is empty.
8CD1 AND A
8CD2 JP Z,LaunchJetman
8CD5 LD A,E Jump to LaunchJetman if bit 3 of the second terrain byte is set (a crater tile).
8CD6 OR E
8CD7 BIT 3,A
8CD9 JP NZ,LaunchJetman
8CDC JP Handler_JetmanMovement_Animate Jump to Handler_JetmanMovement_Animate to move and animate Jetman.
This entry point is used by the routine at Handler_Jetman.
Handler_JetmanWalk_Face 8CDF JP Handler_JetmanMovement_Draw Jump to Handler_JetmanMovement_Draw.
This entry point is used by the routine at Handler_Jetman.
Face Jetman left and keep walking. F0 is a signed -10 leftward speed.
Handler_JetmanWalk_FaceLeft 8CE2 LD A,$F0 Write F0 to *IX+05.
8CE4 LD (IX+$05),A
Bit 2 of the 0-based sprite index is the facing: reset means left and set means right.
8CE7 LD A,(IX+$00) A=*IX+00.
8CEA DEC A Decrease it to a 0-based sprite index.
8CEB RES 2,A Reset the facing bit.
8CED INC A Restore the 1-based sprite ID.
8CEE LD (IX+$00),A Write A back to *IX+00.
8CF1 JP Handler_JetmanWalk Jump to Handler_JetmanWalk.
This entry point is used by the routine at Handler_Jetman.
Face Jetman right and keep walking. 10 is a signed +10 rightward speed.
Handler_JetmanWalk_FaceRight 8CF4 LD A,$10 Write 10 to *IX+05.
8CF6 LD (IX+$05),A
Same 0-based facing bit as 8CE7, but set it for right.
8CF9 LD A,(IX+$00) A=*IX+00.
8CFC DEC A Decrease it to a 0-based sprite index.
8CFD SET 2,A Set the facing bit.
8CFF INC A Restore the 1-based sprite ID.
8D00 LD (IX+$00),A Write A back to *IX+00.
8D03 JP Handler_JetmanWalk Jump to Handler_JetmanWalk.
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