loop problem in code

Basically ive made a class that stores functions for a ball and then a main class that stores my world objects. From the main i create an instance of the ball using its constructor and an array (for multiple instances) and for a set period the ball bounces around using a call to the ball classes evolve function (time steps its path). Problem is that i want to fire many balls at the same time however the program pauses while it carries out the while loop to evolve the current ball.

The code is below.

Code:

#include "cannon.h" #include <windows.h> #include <iostream.h> #include <math.h> #include <stdlib.h> #include <glut.h> float angle1=45.0f; float angle2= -90.0f; double mag=5; double move=0; float Camera_angle = 0.0,ratio, Camera_posx = 0.0,Camera_posy = 0.0,Camera_posz = 0.0; float Los_posx = 0.0,Los_posy = 0.0,Los_posz = -0.5; GLfloat ballColor[] = {0.3,0.3,0.9,1.0}; GLfloat crossHColor[] = {0.8,0.3,0.3,1.0}; float ballY; float ballX; float ballZ = -1; float crossX; float crossY; float crossZ; bool ballMov=false; void init(void) { glEnable(GL_DEPTH_TEST); glClearColor(0.0f,0.0f,0.0f,0.5f); glShadeModel (GL_SMOOTH); glEnable(GL_LIGHTING); //Light 0 Properties/Position GLfloat ambientLight[]={0.1,0.1,0.1,1.0}; GLfloat position[] = {-3,3,3,1}; glLightfv(GL_LIGHT0, GL_AMBIENT, ambientLight); glLightfv(GL_LIGHT0, GL_POSITION, position); glEnable(GL_LIGHT0); //Perspective /* glMatrixMode(GL_PROJECTION) ; glLoadIdentity() ; gluPerspective(45.0, 1.0, 1.0, 40000.0); glMatrixMode(GL_MODELVIEW) ;*/ } void crosshair(float x,float y,float z) { glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, crossHColor); glutSolidSphere(0.02,20,20); } void cannonBall(double x,double y,double z) { glTranslatef(x,y,z); glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, ballColor); glutSolidSphere(0.05,20,20); } void createGround() { GLfloat grassColor[] = {0.0,1.0,0.0,1.0}; GLfloat seaColor[] = {0.3,0.6,0.3,1.0}; float floorHeight=-0.05f;//-0.1745 glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, seaColor); glBegin(GL_QUADS); glVertex3f(-30.0f, floorHeight, -1.0f); //far left glVertex3f(30.0f, floorHeight, -1.0f); //far right glVertex3f(30.0f, floorHeight, -30.0f); //rear right glVertex3f(-30.0f, floorHeight, -30.0f); //rear left glEnd( ); glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, grassColor); glBegin(GL_QUADS); glVertex3f(-30.0f, floorHeight, -1.0f); //far left glVertex3f(30.0f, floorHeight, -1.0f); //far right glVertex3f(30.0f, floorHeight, 4.0f); //rear right glVertex3f(-30.0f, floorHeight, 4.0f); //rear left glEnd( ); } void display(void) { glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glMatrixMode(GL_MODELVIEW); //glRotatef(rotateangle,0,1,0); //glRotatef(rotateangle1,1,0,0); //glRotatef(rotateangle2,0,0,1); //Draw Ball glPushMatrix(); cannonBall(ballX,ballY,ballZ); glPopMatrix(); glPushMatrix(); //crosshair(crossX, crossY, crossZ); createGround(); glPopMatrix(); //glLoadIdentity(); //glEnd(); //gluLookAt(0,0,0, 0,0,-3,0,1,0); glFlush(); glutSwapBuffers(); } int ballNo=0; cannon *cballs[90]; void fire() { cballs[ballNo] = new cannon(5*ballNo,90,5); float delta=0.006; int iter = 100; while(iter>2) { cballs[ballNo]->evolve(delta); ballY = cballs[ballNo]->gety(); ballX = cballs[ballNo]->getx(); ballZ = cballs[ballNo]->getz(); iter-=1; display(); } ballNo+=1; } void anim() { display(); } void orientate(float ang) { Los_posx = sin(ang); Los_posz = -cos(ang); glLoadIdentity(); gluLookAt(Camera_posx, Camera_posy, Camera_posz, Camera_posx + Los_posx,Camera_posy + Los_posy,Camera_posz + Los_posz, 0.0,1.0,0.0); } void moveFlat(int direction) { Camera_posx = Camera_posx + direction*(Los_posx)*0.1; Camera_posz = Camera_posz + direction*(Los_posz)*0.1; glLoadIdentity(); gluLookAt(Camera_posx, Camera_posy, Camera_posz, Camera_posx + Los_posx,Camera_posy + Los_posy,Camera_posz + Los_posz, 0.0,1.0,0.0); } void moveUp(int direction) { Camera_posy = Camera_posy + direction*(Los_posx)*0.1; Camera_posy = Camera_posy + direction*(Los_posz)*0.1; glLoadIdentity(); gluLookAt(Camera_posx, Camera_posy, Camera_posz, Camera_posx + Los_posx,Camera_posy + Los_posy,Camera_posz + Los_posz, 0.0,1.0,0.0); } void keyboard(unsigned char key, int x, int y) { char c='#'; switch(key) { case('w'): moveFlat(1); break; case('s'): moveFlat(-1); break; case('q'): moveUp(1); break; case('e'): moveUp(-1); break; case('a'): Camera_angle -= 0.05; orientate(Camera_angle); break; case('d'): Camera_angle += 0.05; orientate(Camera_angle); break; case('m'): mag+=1; break; case('n'): angle1=angle1+1; break; case('l'): ballMov=false; cout<<"nien"; break; case('f'): fire(); break; } glutPostRedisplay(); } void reshape(int w, int h)//Function To Create Prospective { glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(55, 1.0, 0.1, 400); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } int main( int argc, char * argv[]) { glutInit(&argc, argv); glutInitDisplayMode (GLUT_DOUBLE|GLUT_RGB|GLUT_DEPTH); glutInitWindowSize (800,800); glutCreateWindow ("Game"); init(); glutReshapeFunc(reshape); glutDisplayFunc(display); glutKeyboardFunc(keyboard); glutIdleFunc(anim); glutMainLoop(); return 0; }

As you can see when the f key is hit an instance is created and the while loop in the fire(); function is initiated however it hangs on that loop and does not allow me to fire a second ball until this while loop has finished. Any ideas how to get round this problem?