// sample code to handle the graphics, etc for the flocking project
// try number 2
// Date: 10/23/08
// Author: Don Allison

#include <iostream>
#include <cmath>
#include <GL/glut.h>
#include "boids.h"
using namespace std;

// quick & dirty globals to make things, well, quick & dirty!
const int width = 500;					// window width
const int height = 500;					// window height
const int nBoids = 10;					// number of critters to flock
boids critters[nBoids];					// allocate creature data array




void init(void)
{
	glClearColor(0.5, 0.5, 0.9, 1.0);
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();

	return;
}



void display(void)
{
	int i;
	double x, y;

	glClear(GL_COLOR_BUFFER_BIT);

	for (i=0; i<nBoids; i++)
	{
		critters[i].setx(x = critters[i].getnextx()); critters[i].sety(y = critters[i].getnexty());
		glPushMatrix();
		glTranslated(x, y, 0.0);
		critters[i].draw();
		glPopMatrix();
	}

	glutSwapBuffers();
	return;
}



void animate(void)
{
	int i;

	for (i=0; i<nBoids; i++)
	{
		critters[i].nextPosition();
	}
	glutPostRedisplay();
	return;
}


int main(int argc, char** argv)
{
	glutInit(&argc, argv);
	glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
	glutInitWindowSize(width, height);
	glutInitWindowPosition(100, 100);
	glutCreateWindow("flocks");
	init();
	glutDisplayFunc(display);
	glutIdleFunc(animate);
	glutMainLoop();
	return 0;
}