/*****************************************************************
  orbits.cpp
  by Dave Pape
  18 Feb 2003

*****************************************************************/
#include <stdlib.h>
#include <math.h>
#include <unistd.h>
#include <stdio.h>
#include <GL/glut.h>
#include <GL/gl.h>
#include <dms/dms.h>

using namespace dms;

void createScene(Object& root);
void spinObject(Object&,void*);
void drawEverything(void);

void mousemotion(int x, int y);
void key(unsigned char k, int x, int y);
void specialkey(int k, int x, int y);
void idle(void);


PerspCamera camera;
Light light;
Object root;

int main(int argc, char *argv[])
    {
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    glutInitWindowSize(512,512);
    glutCreateWindow(argv[0]);
    
    glutDisplayFunc(drawEverything);
    glutKeyboardFunc(key);
    glutSpecialFunc(specialkey);
    glutMotionFunc(mousemotion);
    glutIdleFunc(idle);
    
    camera.setPosition(0, 0, 10);
    light.setInfinitePosition(-5, 4, 1);
    createScene(root);
    
    glutMainLoop();
    return 0;
    }


void createScene(Object& root)
    {
    QuadricObject *ball1, *ball2, *ball3;
    Material *material;
    SimpleTransform *xform;
    float *speed;
    
    ball1 = new QuadricObject;
    ball1->setDrawStyle(GLU_LINE);
    material = new Material(Color::Yellow);
    ball1->setMaterial(*material);
    xform = new SimpleTransform;
    ball1->setTransform(*xform);
    speed = new float;
    *speed = 10.0;
    ball1->setUpdateCallback(spinObject,speed);
    root.attach(*ball1);
    
    ball2 = new QuadricObject;
    material = new Material(Color::Red);
    ball2->setMaterial(*material);
    xform = new SimpleTransform;
    xform->setTranslation(5.0, 0.0, 0.0);
    ball2->setTransform(*xform);
    speed = new float;
    *speed = 30.0;
    ball2->setUpdateCallback(spinObject,speed);
    ball1->attach(*ball2);
    
    ball3 = new QuadricObject;
    material = new Material(Color::Grey30);
    ball3->setMaterial(*material);
    xform = new SimpleTransform;
    xform->setTranslation(2.0, 0.0, 0.0);
    xform->setScaling(0.2);
    ball3->setTransform(*xform);
    ball2->attach(*ball3);
    
    ball3 = new QuadricObject;
    material = new Material(Color::Magenta);
    ball3->setMaterial(*material);
    xform = new SimpleTransform;
    xform->setTranslation(0.0, 0.0, 2.0);
    xform->setScaling(0.2);
    ball3->setTransform(*xform);
    ball2->attach(*ball3);
    }


void spinObject(Object& object, void* data)
    {
    float speed = *((float*)data);
    SimpleTransform& xform = (SimpleTransform&)object.transform();
    xform.setRotation(currentTime() * speed, 0.0, 1.0, 0.0);
    }


void drawEverything(void)
    {
    glClearColor(0.5, 0.7, 1.0, 0.0);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    glEnable(GL_DEPTH_TEST);
    
    camera.apply();
    
    light.apply();

    root.drawAll();

    glutSwapBuffers();

    checkGLError("end-of-frame");
    }


void key(unsigned char k, int x, int y)
    {
    if (k == 27)
        exit(0);
    }


void specialkey(int k, int x, int y)
    {
    if (k == GLUT_KEY_LEFT)
        camera.moveLeft(0.25);
    else if (k == GLUT_KEY_RIGHT)
        camera.moveLeft(-0.25);
    else if (k == GLUT_KEY_UP)
        camera.moveForward(0.25);
    else if (k == GLUT_KEY_DOWN)
        camera.moveForward(-0.25);
    else if (k == GLUT_KEY_PAGE_UP)
        camera.zoom(-1);
    else if (k == GLUT_KEY_PAGE_DOWN)
        camera.zoom(1);
    }


void mousemotion(int x, int y)
    {
    GLfloat xrot, yrot;
    xrot = -(((float)y / glutGet(GLUT_WINDOW_HEIGHT)) * 90.0 - 45.0);
    yrot = -(((float)x / glutGet(GLUT_WINDOW_WIDTH)) * 180.0 - 90.0);
    camera.setXRotation(xrot);
    camera.setYRotation(yrot);
    }


void idle(void)
    {
    root.updateAll();
    glutPostRedisplay();
    }