Routines
Prev: 48093 Up: Map Next: 48236
48183: Choose Outlaw Move
Used by the routine at HandleWaitingOutlaw.
Gives the waiting outlaw a new move: a speed in each direction of up to three, taken from random numbers, and a time for the move of eight to thirty nine frames. On the last move the speeds are doubled.
Input
IX The address of the outlaw
Choose a horizontal speed.
ChooseOutlawMove 48183 LD A,(41496) Fetch a random number and keep it in C.
48186 LD C,A
48187 AND %00000011 Keep a number from 0 to 3.
48189 BIT 7,C Jump to ChooseOutlawMove_Vertical if the top bit of the random number is clear.
48191 JR Z,ChooseOutlawMove_Vertical
48193 NEG Make the speed negative.
Store it, then choose a vertical speed.
ChooseOutlawMove_Vertical 48195 LD (IX+1),A Set the horizontal speed.
48198 LD A,(41497) Fetch another random number and keep it in C.
48201 LD C,A
48202 AND %00000011 Keep a number from 0 to 3.
48204 BIT 7,C Jump to ChooseOutlawMove_Time if the top bit of the random number is clear.
48206 JR Z,ChooseOutlawMove_Time
48208 NEG Make the speed negative.
Store the vertical speed, then set the time of the move.
ChooseOutlawMove_Time 48210 LD (IX+3),A Set the vertical speed.
48213 LD A,(41494) Fetch the frame counter.
48216 AND %00011111 Keep a number from 0 to 31.
48218 ADD A,8 Add eight.
48220 LD (IX+11),A Set the timer for the move.
48223 DEC (IX+10) Count down the moves left.
48226 RET NZ Return unless that was the last move.
48227 SLA (IX+1) Double the horizontal speed.
48231 SLA (IX+3) Double the vertical speed.
48235 RET Return.
Prev: 48093 Up: Map Next: 48236