struct XYZ
{
float x;
float y;
float z;
}
void CSolar :: CreateSphere(XYZ c,double r,int n)
{
int i,j;
double theta1,theta2,theta3;
XYZ e,p;
if (r < 0) r = -r;
if (n < 0) n = -n;
if (n < 4 || r <= 0)
{
glBegin(GL_POINTS);
glVertex3f(c.x,c.y,c.z);
glEnd();
return;
}
for (j=0;j<n/2;j++)
{
theta1 = j * TWOPI / n - PID2;
theta2 = (j + 1) * TWOPI / n - PID2;
glBegin(GL_QUAD_STRIP);
for (i=0;i<=ni++)
{
theta3 = i * TWOPI / n;
e.x = cos(theta2) * cos(theta3);
e.y = sin(theta2);
e.z = cos(theta2) * sin(theta3);
p.x = c.x + r * e.x;
p.y = c.y + r * e.y;
p.z = c.z + r * e.z;
glNormal3f(e.x,e.y,e.z);
glTexCoord2f(i/(double)n,2*(j+1)/(double)n);
glVertex3f(p.x,p.y,p.z);
e.x = cos(theta1) * cos(theta3);
e.y = sin(theta1);
e.z = cos(theta1) * sin(theta3);
p.x = c.x + r * e.x;
p.y = c.y + r * e.y;
p.z = c.z + r * e.z;
glNormal3f(e.x,e.y,e.z);
glTexCoord2f(i/(double)n,2*j/(double)n);
glVertex3f(p.x,p.y,p.z);
}
glEnd();
}
}
