Routines
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26225: Alien hit
Call when the player bullet hits an alien. The alien explosion is drawn where the alien is, the blurbler is called, then the explosion is cleared. The game freezes while the explosion is on screen and the sound is playing, but you don't notice it.
If there are more aliens this jumps out the recalc_horde_stats routine. If the last one was hit, rind the end of screen siren, clean up a bit, then return.
Used by the routine at bullet_alien_coll_yaxis.
Input
IX Address of alien structure UDG data, less 2
alien_hit 26225 CALL alien_hit_zero_udgs Zero out the alien in the UDG data
26228 LD HL,_EXPLOSION_UDG_TOP Puts _EXPLOSION_UDG_TOP into _EXPLOSION_GFX_TOP. Top char row of explosion graphic
26231 LD (_EXPLOSION_GFX_TOP),HL
26234 LD HL,_EXPLOSION_UDG_BOTTOM Put _EXPLOSION_UDG_BOTTOM into _EXPLOSION_GFX_BOTTOM. Bottom char row of explosion graphic
26237 LD (_EXPLOSION_GFX_BOTTOM),HL
26240 CALL draw_alien_explosion Draw the explosion on screen and remove the player bullet
26243 CALL clear_player_bullet
26246 CALL sound_burbler Sound burbler
26249 DEFB 16,80,32,40,64,20,128,10 Alien hit sound
26257 DEFB 0
Sound burbler return point
26258 CALL increase_score Bump score based on alien type hit
26261 LD HL,_EXPLOSION_UDG_CLEAR Now draw an "blank" alien explosion to clear that bit of the screen
26264 LD (_EXPLOSION_GFX_TOP),HL
26267 LD (_EXPLOSION_GFX_BOTTOM),HL
26270 CALL draw_alien_explosion
26273 LD A,(_NUM_ALIENS_REMAINING) One fewer alien to deal with
26276 DEC A
26277 LD (_NUM_ALIENS_REMAINING),A
26280 JP NZ,recalc_horde_stats If there are more aliens, jump out via the routine which works out the horde's extremes
If we get here the last alien has been zapped
26283 CALL clear_alien_bullets Clear all alien bullets from screen
26286 LD B,40 40 rings of the siren
screen_clear_siren 26288 LD A,(_PORT254_SHADOW) Pick up port 254 shadow
26291 ADD A,8 Roll the border colour
26293 AND 56
26295 LD (_PORT254_SHADOW),A
26298 CALL sound_burbler Sound burbler
26301 DEFB 16,100,32,50,64,25,32,50 Last alien hit sound
26309 DEFB 0
26310 DJNZ screen_clear_siren
Clean up a bit, return to go and start next screen
26312 CALL clear_spaceship
26315 CALL clear_bottom_char_row Clear bottom row
26318 POP HL
26319 RET
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