/*
 * (c) Copyright 1993, Silicon Graphics, Inc.
 *               1993-1995 Microsoft Corporation
 *
 * ALL RIGHTS RESERVED
 *
 * Please refer to OpenGL/readme.txt for additional information
 *
 */

/*
 *  disk.c
 *  This program demonstrates the use of the quadrics
 *  Utility Library routines to draw circles and arcs.
 */
#include "glos.h"

#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glaux.h>

void myinit(void);
void CALLBACK myReshape(GLsizei w, GLsizei h);
void CALLBACK display(void);

GLUquadricObj * quadObj;

/*  Clear the screen.  For each triangle, set the current 
 *  color and modify the modelview matrix.
 */
void CALLBACK display(void)
{
    glClearColor (0.0, 0.0, 0.0, 1.0);
    glClear (GL_COLOR_BUFFER_BIT);

    glPushMatrix();
    gluQuadricDrawStyle (quadObj, GLU_FILL);
    glColor3f (1.0, 1.0, 1.0);
    glTranslatef (10.0, 10.0, 0.0);
    gluDisk (quadObj, 0.0, 5.0, 10, 2);
    glPopMatrix();

    glPushMatrix();
    glColor3f (1.0, 1.0, 0.0);
    glTranslatef (20.0, 20.0, 0.0);
    gluPartialDisk (quadObj, 0.0, 5.0, 10, 3, 30.0, 120.0);
    glPopMatrix();

    glPushMatrix();
    gluQuadricDrawStyle (quadObj, GLU_SILHOUETTE);
    glColor3f (0.0, 1.0, 1.0);
    glTranslatef (30.0, 30.0, 0.0);
    gluPartialDisk (quadObj, 0.0, 5.0, 10, 3, 135.0, 270.0);
    glPopMatrix();

    glPushMatrix();
    gluQuadricDrawStyle (quadObj, GLU_LINE);
    glColor3f (1.0, 0.0, 1.0);
    glTranslatef (40.0, 40.0, 0.0);
    gluDisk (quadObj, 2.0, 5.0, 10, 10);
    glPopMatrix();
    glFlush();
}

void myinit (void) {
    quadObj = gluNewQuadric ();
    glShadeModel(GL_FLAT);
}

void CALLBACK myReshape(GLsizei w, GLsizei h)
{
    h = (h == 0) ? 1 : h;
    glViewport(0, 0, w, h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    if (w <= h) 
    glOrtho (0.0, 50.0, 
        0.0, 50.0*(GLfloat)h/(GLfloat)w, -1.0, 1.0);
    else 
    glOrtho (0.0, 50.0*(GLfloat)w/(GLfloat)h, 
        0.0, 50.0, -1.0, 1.0);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity ();
}

/*  Main Loop
 *  Open window with initial window size, title bar, 
 *  RGBA display mode, and handle input events.
 */
int main(int argc, char** argv)
{
    auxInitDisplayMode (AUX_SINGLE | AUX_RGB);
    auxInitPosition (0, 0, 500, 500);
    auxInitWindow ("Quadrics");
    myinit ();
    auxReshapeFunc (myReshape);
    auxMainLoop(display);
    return(0);
}
