71 lines
1.5 KiB
C
71 lines
1.5 KiB
C
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/* mp1-given.c
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* Code I wrote so that the students don't have to. In the kernel, these
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* reside in rtc.c
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* Mark Murphy 2007
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*/
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#include "mp1.h"
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/* These are defined in mp1.c */
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extern char base_alive[3];
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extern struct missile* mp1_missile_list;
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extern int mp1_score;
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/* Check if an explosion at (x,y) touches any of the three bases */
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static int explode_base(int x, int y){
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int bases_killed = 0;
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if(y >= 23){
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if(17 <= x && x <= 23){
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if(base_alive[0])
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bases_killed++;
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base_alive[0] = 0;
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}else
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if(37 <= x && x <= 43){
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if(base_alive[1])
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bases_killed++;
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base_alive[1] = 0;
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}else
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if(57 <= x && x <= 63){
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if(base_alive[2])
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bases_killed++;
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base_alive[2] = 0;
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}
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}
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return bases_killed;
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}
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/* missile_explode()
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* Check if an exploding missile has side-effects - killing other missiles,
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* killing bases, etc.
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* Arguments : struct missile *m - the missile which exploded
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* Returns : zero if no game state was changed, nonzero if game state
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* (other missiles or bases) has changed
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*/
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int missile_explode(struct missile *m){
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struct missile *i = mp1_missile_list;
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int exploded = 0;
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if(!m->exploded){
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m->exploded = 50;
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}
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if(m->c == 'e'){
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exploded += explode_base(m->x>>16, m->y>>16);
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}
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while(i){
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if(i != m){
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int dx, dy;
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dx = (m->x>>16) - (i->x>>16);
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dy = (m->y>>16) - (i->y>>16);
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if(dx >= -2 && dx <= 2 && dy >= -1 && dy <= 1 &&
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i->exploded == 0 && i->c == 'e' && m->c == '*'){
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mp1_score++;
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exploded++;
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i->exploded = 50;
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}
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}
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i = i->next;
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}
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return exploded;
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}
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