Programming and Graphics

8.2 Graphics events 277

#include <iostream>

#include <cmath>

#include <freeglut.h>

using namespace std;

void pacman(void);

void resize(int, int);

void quit(unsigned char, int, int);

int win;

const float pi = 3.14159265358;

int N=64; // for Pac-Man

float Dtheta = 1.5*pi/N; // for Pac-Man

/*---------- main---------------------*/

int main(int argc, char **argv)

{

glutInit(&argc, argv);

glutInitDisplayMode(GLUTDEPTH | GLUTDOUBLE | GLUTRGBA);

glutInitWindowPosition(100,100);

glutInitWindowSize(320,320);

win=glutCreateWindow("GLUT shapes");

glOrtho(-1.2, 1.2, -1.2, 1.2, -1.2, 1.2);

glutDisplayFunc(pacman);

glutIdleFunc(pacman);

glutReshapeFunc(resize);

glutKeyboardFunc(quit);

glutMainLoop();

return 0;

}

/*---------- Pac-Man ---------------------*/

void pacman()

{

glClear(GLCOLORBUFFERBIT);

glBegin(GLTRIANGLEFAN);

glColor3f(0.1,0.9,0.0);

glVertex2f(0,0);

for (int i=0; i <= N; i++)

{

float angle = i*Dtheta+0.5*pi;

glVertex2f(cos(angle),sin(angle));

}

glEnd();

glutSwapBuffers();

}