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[l]Hi Ahmed,

I downloaded OpenGL-T and ran the program.. My experience in OpenGL is not good at all.

I can help you but to let the particles reflect you need to have some equations that do that..

I need to know the equations first..

Also, what kind of shape you need to put..?

Take care..[/l]

First of all the program you have contains some errors

here is a correct version of your code

#include 
#include 
#include 
#include 

const ParticleTotal = 250; 

int ActiveParticles=0; 
int NewOnes = 5; 

int Front=0; 

struct Particle 
{ 
	int age; 
	double x,y,z; //location 
	double dx,dy,dz; // movement vector 
}; 

Particle PSys[ParticleTotal]; 

void InitParticle(int X, int Y, int Z, 
				  int Age, 
				  int MaxAngle, int Radius, 
				  int Speed, 
				  int Tilt, Particle &P) 
{ 
	int AgeMin = Age/2; 
	P.age = Age/2 + rand() % AgeMin; // age--->.5*age to age 

	double R = 1.0 - ((rand() % 200) * .01);	// R = [-0.99, 1.0]
	P.x = R * Radius + X; 
	P.y = 1.0 * Y; 

	const float pi_180 = 3.14 / 180;
	double Alpha = R * MaxAngle * pi_180; // times pi/180 --->radians 
	double Beta = Tilt * pi_180; 
	P.dy = -(cos(Beta) * Speed)/10; 
	P.dx = -(tan(Alpha)* P.dy);
} 


void ProcessParticle (double Grav, Particle &P) //.003 works 
{ 
	P.age--; 
	P.x = P.x + P.dx; 
	P.y = P.y + P.dy; 
	P.dy = P.dy + Grav;
} 

void Retire(int Loc) 
{ 
	for (int i = Loc; i < ActiveParticles; i++) 
		PSys = PSys[i+1]; 
	--ActiveParticles;
} 

void DoParticles () 
{ 
	int A; 
	int Spot = ActiveParticles;
	if (ActiveParticles + NewOnes < ParticleTotal) 
	{ 
		for (int j=0; j < NewOnes;++j) 
		{ 
			// x y z age angle rad speed tilt 
			InitParticle(150,60,0,100,45,5,5,0,PSys[Spot]); 
			++ActiveParticles; 
			++Spot;
		}
	} 

	if (ActiveParticles > 0) 
	{ 
		for (int i=0; i< ActiveParticles;i++) 
		{ 
			A=PSys.age; 
			if (A<1) 
				Retire(i); 
			else 
			{ 
				ProcessParticle(0.1,PSys); //gravity 
			}
		}
	} 

	glutPostRedisplay();

	// Suspends the process for 60 milliseconds
	Sleep(60); // just to slow things down
} 

void display() 
{ 
	glClear (GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); 

	int Spot = Front; 
	for (int i=0 ; i	{ 
		glBegin(GL_POINTS); 
		glColor3f(1.0, 0.0, 0.0); 
		glVertex2f(PSys.x,PSys.y); 
		glEnd(); 

		if (Spot == ParticleTotal) 
			Spot= 0; 
		else 
			++Spot; 
	} 
 	glutSwapBuffers();
} 

void init() 
{ 
	gluOrtho2D(0.0,300,300,0.0); //1-r-b-t 
	glPointSize(1);
} 

void main (int argc, char**argv) 
{ 
	srand(time(NULL));

	glutInit(&argc,argv);
	glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB);
	glutInitWindowSize(300,300);
	glutInitWindowPosition(100,100);
	glutCreateWindow("Particle System");
	init(); 
	glutIdleFunc(DoParticles); 
	glutDisplayFunc(display); 
	glutMainLoop();
}

Sallam

Thank you for your quick response, the program works correctly , if you can give me your e-mail to send the code so you can run it again.

I have a handout from 3 pages, and it contains the equations that you ask about and code.

Could you tell me how I can send it to you? If you have fax number or another way to send it you let me know.

This homework is due to 2, February 2002, The shape could be any shape (ex triangle, circle, square..)

I looking for your response !