/* Displays a sphere and allows you to change the stacks and slices.

Written by Scott D. Anderson
scott.anderson@acm.org
Fall 2003
*/

#include <stdio.h>
#include <math.h>
#include <tw.h>

int Stacks = 4;
int Slices = 4;
bool wire = true;               // when true, draw a wire-frame figure.  Controlled by a key callback.

void display(void) {
    twDisplayInit();
    twCamera();

    twColorName(TW_BLUE);
    if(wire) 
        glutWireSphere(4,Slices,Stacks);
    else
        glutSolidSphere(4,Slices,Stacks);

    glFlush();
    glutSwapBuffers();       // necessary for animation
}

void adjust(unsigned char key, int x, int y) {
    switch(key) {
    case '1': Slices++; break;
    case '2': Slices--; break;
    case '3': Stacks++; break;
    case '4': Stacks--; break;
    case 'w': wire = !wire;
    }
    glutPostRedisplay();
}

int main(int argc, char** argv) {
  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
  twInitWindowSize(500,500);
  glutCreateWindow(argv[0]);
  glutDisplayFunc(display);
  twBoundingBox(-4,+4,-4,+4,-4,+4);
  twMainInit(); 
  twKeyCallback('1',adjust,"More Slices");
  twKeyCallback('2',adjust,"Fewer Slices");
  twKeyCallback('3',adjust,"More Stacks");
  twKeyCallback('4',adjust,"Fewer Stacks");
  twKeyCallback('w',adjust,"toggle wireframe mode");
  glutMainLoop();
  return 0;
}