/*****************************************************************
  glutText1.cpp
  by Dave Pape
  22 April 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 drawEverything(void);

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


PerspCamera camera;
OrthoCamera orthocamera(0, 1, 0, 1);
Light light;

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);
    glutIdleFunc(idle);
    
    camera.setPosition(0, 3, 40);
    light.setInfinitePosition(1, 1, 1);
    
    glutMainLoop();
    return 0;
    }


void drawStrokeString(char *string)
    {
    for (char *p=string; *p; p++)
        glutStrokeCharacter(GLUT_STROKE_ROMAN, *p);
    }

void drawBitmapString(char *string)
    {
    for (char *p=string; *p; p++)
        glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24, *p);
    }


void drawEverything(void)
    {
    float y = fabs(sin(currentTime()/2)) * 20;
    char str[256];
    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();
    glPushMatrix();
     glTranslatef(0, y, 0);
     glEnable(GL_LIGHTING);
     glutSolidTeapot(1);
     glDisable(GL_LIGHTING);
     
     glPushMatrix();
      glRotatef(currentTime()*20, 0, 1, 0);
      glTranslatef(2, 0, 0);
      glScalef(0.015, 0.015, 0.015);
      sprintf(str, "Y = %0.1f", y);
      glColor3f(0, 0, 0);
      drawStrokeString(str);
     glPopMatrix();

    glPopMatrix();

    orthocamera.apply();
    sprintf(str, "time = %.2f", currentTime());
    glColor3f(1, 1, 0);
    glRasterPos2f(0.05, 0.1);
    drawBitmapString(str);
    glColor3f(0.5, 0.4, 0.2);
    sprintf(str, "teapot height = %.2f",  y);
    glRasterPos2f(0.05, 0.02);
    drawBitmapString(str);
    
    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.turn(3);
    else if (k == GLUT_KEY_RIGHT)
        camera.turn(-3);
    else if (k == GLUT_KEY_UP)
        camera.pitch(2);
    else if (k == GLUT_KEY_DOWN)
        camera.pitch(-2);
    else if (k == GLUT_KEY_HOME)
        camera.moveForward(0.25);
    else if (k == GLUT_KEY_END)
        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 idle(void)
    {
    glutPostRedisplay();
    }


/*
    glRasterPos2f(sin(currentTime())/5.0, 0.3);
    drawBitmapString(str);
    drawBitmapString2(str, sin(currentTime())/5.0, 0.2);

void drawBitmapString2(char *string,float x,float y)
    {
    for (char *p=string; *p; p++)
        {
        glRasterPos2f(x,y);
        glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_24, *p);
        x += (float)glutBitmapWidth(GLUT_BITMAP_TIMES_ROMAN_24, *p) / glutGet(GLUT_WINDOW_WIDTH);
        }
    }
*/