void moveAlienBullets(){
int i;
tankDeathOccurred = 0;
for(i = 0; i < NUM_ALIEN_BULLETS; i++){
if(bulletArray[i].type != INACTIVE_BULLET){ //bullet is active
bulletArray[i].y += ALIEN_BULLETS_PIXELS_PER_MOVE;
bulletArray[i].state = (bulletArray[i].state + 1) % 3;
undrawAlienBullet();
ScreenPoint hitCoord = alienBulletCollision(i);
if(bulletArray[i].y >= BOTTOM_OF_PLAYABLE_AREA - BULLET_HEIGHT){
bulletArray[i].type = INACTIVE_BULLET; //bullet has gone offscreen so deactivate the bullet
clearAlienBullet(i);
bulletArray[i].y = -BULLET_HEIGHT; //make sure the tank isn't overwritten by a rogue bullet
//schedule the next bullet fire
if(tankDeathOccurred)
tankDeath();
else
insertDC(rand() % MAX_TICS_BETWEEN_ALIEN_FIRE, EVENT_ALIEN_FIRE);
}
else if(hitCoord.xcoord >= 0 && hitCoord.ycoord >= 0){
if(DB_ON1) xil_printf("These are the alien bullet hit coordiantes: %d, %d\n\r",hitCoord.xcoord, hitCoord.ycoord);
if(DB_ON1) xil_printf("And these are the bullet's x,y coordinates: %d, %d\n\r",bulletArray[i].x, bulletArray[i].y);
bulletArray[i].type = INACTIVE_BULLET; //deactive the bullet since it's hit either the bunker or the tank
clearAlienBullet(i);
if(tankDeathOccurred)
tankDeath();
else
insertDC(rand() % MAX_TICS_BETWEEN_ALIEN_FIRE, EVENT_ALIEN_FIRE);
}
}
}
drawAlienBullet(-1);
}
// Update the locations of all alien bullets.
// This generally means moving the bullets down by two pixels.
// However, it also erases the bullets when they reach the bottom line.
void updateBullets() {
int i;
for (i=0; i<BULLET_COUNT; i++) {
if (getAlienBullet(i).is_in_flight) {
//drawTBullet0(getAlienBullet(i), true);
int isHit = checkAlienBulletHits(i);
clearAlienBullet(false, getAlienBullet(i));
shiftAlienBullet(i);
if (getAlienBullet(i).point.y < 430 && isHit) {
incrementBulletStage(i);
if (getAlienBullet(i).type == T_type) {
switch(getAlienBullet(i).bullet_stage) {
case (BULLET_STAGE_0):
drawTBullet0(getAlienBullet(i), false);
break;
case (BULLET_STAGE_1):
drawTBullet1(getAlienBullet(i), false);
break;
case (BULLET_STAGE_2):
drawTBullet2(getAlienBullet(i), false);
break;
default:
break;
}
} else {
switch(getAlienBullet(i).bullet_stage) {
case (BULLET_STAGE_0):
drawSBullet0(getAlienBullet(i), false);
break;
case (BULLET_STAGE_1):
drawSBullet1(getAlienBullet(i), false);
break;
case (BULLET_STAGE_2):
drawSBullet2(getAlienBullet(i), false);
break;
case (BULLET_STAGE_3):
drawSBullet3(getAlienBullet(i), false);
break;
default:
break;
}
}
} else {
disableBullet(i);
}
}
}
}
