void
collideBullets(void)
{
int i,j,k1,k2;
float dx,dy;
float x,y,r;
float xv,yv,e;
for (i=0; i<MAX_BULLETS; i++)
if (bullet[i].inuse)
for (j=0; j<MAX_ROCKS; j++)
if (rock[j].inuse) {
x = rock[j].x;
y = rock[j].y;
r = rock[j].radius;
dx = abs(bullet[i].x - x);
dy = abs(bullet[i].y - y);
if (dx + dy < r) { /* quick manhattan metric */
xv = rock[j].xv;
yv = rock[j].yv;
/* remove bullet and rock from circulation */
rock[j].inuse = bullet[i].inuse = 0;
if (r > 1.2) {
/* split larger asteroids into two smaller ones */
k1 = allocRock();
if (k1 >= 0) {
initRock(k1, r/2.0 + frand(0.5) - 0.3);
rock[k1].x = x + frand(r) - r/2.0;
rock[k1].y = y + frand(r) - r/2.0;
}
k2 = allocRock();
if (k2 >= 0) {
initRock(k2, r/2.0 + frand(0.5) - 0.2);
rock[k2].x = x + frand(r) - r/2.0;
rock[k2].y = y + frand(r) - r/2.0;
}
if (k1 + k2 >= 0) {
/* conserve momentum assuming equal masses */
e = rock[k1].xv + rock[k2].xv - xv;
rock[k1].xv -= e/2.0;
rock[k2].xv -= e/2.0;
e = rock[k1].yv + rock[k2].yv - yv;
rock[k1].yv -= e/2.0;
rock[k2].yv -= e/2.0;
}
}
j = MAX_ROCKS;
}
}
}
void
initRocks(void)
{
int i;
for (i=0; i<4; i++) {
initRock(i, 1.0 + frand(3.0));
}
}
//Draw the rocks out
void drawRocks()
{
glPushMatrix();
glTranslated(planepos[0], planepos[1], planepos[2]); // change the position of terrain to make it shows infront of camera
glRotatef(180, 0, 1, 0);
drawplane();
glPopMatrix();
for (int i = 0; i < 9; i++) {
glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18,'A');
initRock();
if(rocks[i].age > 0){
rocks[i].age -= 1.5;
rockpos=(float) (rand() %10 );
glPushMatrix();
rocks[i].pos[2] += speed;
glColor3f(rocks[i].color[0], rocks[i].color[1], rocks[i].color[2]);
glMaterialfv(GL_FRONT, GL_AMBIENT, colorBlue);
glTranslatef(rocks[i].pos[0], rocks[i].pos[1], rocks[i].pos[2]);
//rocks[i].pos[0] += rocks[i].velo[0];
//glutSolidCube(10);
glutSolidSphere(10, 15, 15);
glPopMatrix();
}
}
}
