Regarding glutReshapeFunc()
I have small code drawing a square initially but when I maximize the
window it changes to rectangle. I know this has do with aspect ratio and
when I add glutReshapeFunc(Reshape); call it works perfectly, I mean after
maximizing the window, it remains square only. ReshapFunc is called every
time display is modified and before the first display as well. I am not
getting just by adding reshapefunc, how it maintains aspect ratio. Please
help me understanding this. I am copying my code here:
void display()
{
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(0.5, 0.5, 1.0);
glBegin(GL_POLYGON);
glVertex2f(-0.5, -0.5);
glVertex2f(0.5, -0.5);
glVertex2f(0.5, 0.5);
glVertex2f(-0.5, 0.5);
glEnd();
glutSwapBuffers();
glFlush();
}
void Reshape(int w, int h) {
glutPostRedisplay();
}
void init()
{
glClearColor(1.0, 0.0, 1.0, 0.0);
glColor3f(1.0, 1.0, 1.0);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(-1.0, 1.0, -1.0, 1.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE);
glutInitWindowSize(500, 500);
glutInitWindowPosition(200, 200);
glutCreateWindow("basics");
glutDisplayFunc(display);
// If I comment this, it will become rectangle.
glutReshapeFunc(Reshape);
init();
glutMainLoop();
}