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#include "video.h"
#include "keyboard.h"
#include "sound.h"
#include "delay.h"
struct shot_t {
int8 x,y; // x==-1 -> inactive shot
};
#define NUMSHOTS 5
static struct shot_t shots[NUMSHOTS];
static int8 ship,shipmove;
struct alien_t {
int8 x,y; // x==-1 -> dead alien
int8 xadd;
};
#define NUMALIENS 40
static struct alien_t aliens[NUMALIENS];
static bool gameover, winner;
void resetgame()
{
gameover=false;
winner=false;
{
uint8 i;
for (i=0;i<NUMSHOTS;++i) shots[i].x=-1;
};
ship=40;
shipmove=0;
{
uint8 x,y;
for (x=0;x<8;++x) {
for (y=0;y<5;++y) {
struct alien_t *a = &aliens[y*8+x];
a->x=x*7+12;
a->y=y*2;
a->xadd = ( (x%2) ^ (y%2) ) ? -1 : 1;
};
};
};
};
void display()
{
// clear screen
video_usecolor(0,0);
video_fill(0,0,80,25,0);
// display shots
{
uint8 i;
video_usecolor(4,0);
for (i=0;i<NUMSHOTS;++i) {
if (shots[i].x!=-1) {
video_putchar(shots[i].x,shots[i].y,'|');
};
};
};
// display ship
{
video_usecolor(5,0);
video_putchar(ship-1,24,'/');
video_putchar(ship,23,'_');
video_putchar(ship+1,24,'\\');
};
// display aliens
{
uint8 i;
video_usecolor(3,0);
for (i=0;i<NUMALIENS;++i) {
if (aliens[i].x!=-1) {
video_putchar(aliens[i].x-1,aliens[i].y,'-');
video_putchar(aliens[i].x,aliens[i].y,'*');
video_putchar(aliens[i].x+1,aliens[i].y,'-');
};
};
};
// show the picture
video_update();
};
void keywork()
{
uint8 key;
bool pressed;
for (;;) {
key_decode(&key,&pressed);
switch (key) {
case '<':
if (pressed) {
shipmove=-1;
}else{
if (shipmove==-1) shipmove=0;
};
break;
case '>':
if (pressed) {
shipmove=1;
}else{
if (shipmove==1) shipmove=0;
};
break;
case ' ':
{
uint8 i;
if (!pressed) break;
for (i=0;i<NUMSHOTS;++i) {
if (shots[i].x==-1) {
shots[i].x=ship;
shots[i].y=24;
break;
};
};
};
break;
case 'x':
return;
};
};
};
void calculate()
{
uint8 i,k;
bool foundalien=false;
ship+=shipmove;
if (ship<1) ship=1;
if (ship>78) ship=78;
for (i=0;i<NUMSHOTS;++i) {
if (shots[i].x!=-1) {
shots[i].y--;
if (shots[i].y==-1) {
shots[i].x=-1;
};
};
};
for (i=0;i<NUMALIENS;++i) {
if (aliens[i].x!=-1) {
foundalien=true;
for (k=0;k<NUMSHOTS;++k) {
if (shots[k].x!=-1) {
if (shots[k].y==aliens[i].y) {
if ( (shots[k].x<=aliens[i].x+1) &&
(shots[k].x>=aliens[i].x-1) ) {
shots[k].x=-1;
aliens[i].x=-1;
goto nextalien;
};
};
};
};
aliens[i].x += aliens[i].xadd;
if (aliens[i].x<1) {
aliens[i].x=1;
aliens[i].xadd=1;
aliens[i].y++;
}else if (aliens[i].x>78) {
aliens[i].x=78;
aliens[i].xadd=-1;
aliens[i].y++;
};
if (aliens[i].y>=20) gameover=true;
};
nextalien:;
};
if (!foundalien) gameover = winner = true;
};
void sounder()
{
{
uint8 i;
for (i=0;i<NUMSHOTS;++i) {
if (shots[i].x!=-1) {
sound_freq(shots[i].y*100+100);
}else{
sound_nosound();
};
delay_wait(1193180/80);
};
};
sound_nosound();
};
void displaygameover()
{
uint8 key;
bool pressed;
video_usecolor(6,1);
video_putstring(30,10," GAME OVER ");
video_putstring(30,11,winner ? " YOU WIN " : " YOU LOOSE ");
video_putstring(30,12," PRESS ESC ");
video_update();
do{
key_decode(&key,&pressed);
key_polling();
} while (!(pressed&&(key=='@')));
};
void game()
{
// video_blinkchars(false);
video_hidecursor();
for (;;) {
resetgame();
while (!gameover) {
display();
sounder();
keywork();
calculate();
};
displaygameover();
};
};
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