/*
 *  a1p2.cpp
 *  CompFormApp
 *
 *  Created by Matthew Parker on 9/7/07.
 *  Copyright 2007 __MyCompanyName__. All rights reserved.
 *
 */

#include <a1p2.h>

#include <gl/gl.h>
#include <gl/glut.h>

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

float    mouseX = 0;
float    mouseY = 0;
int        windowW = 800;
int        windowH = 600;

#define PI 3.14159265358979

void drawPortrait(void){
    
    glColor3f(0,0,0);                        //sets color to red (red, green, blue)   
   
    glBegin(GL_TRIANGLE_FAN);   
    
    for(int i = 0; i < facePtsLength; i++){
        glVertex2f(facePts[i][0],facePts[i][1]);
    }
    
    glEnd();
   
    glColor3f(1,1,1);                        //sets color to red (red, green, blue)   
   
    glBegin(GL_TRIANGLE_STRIP);   
    
    for(int i = 0; i < eyePtsLength; i++){
        glVertex2f(eyePts[i][0],eyePts[i][1]);
    }
    
    glEnd();
   
    glColor3f(1,0,0);    //sets color to red (red, green, blue)   

    glLineWidth(3);

    //Draw "M"

    glBegin(GL_LINE_STRIP);   
   
    glVertex2f(600, 50);    
    glVertex2f(600,100);
    glVertex2f(625, 75);
    glVertex2f(650,100);
    glVertex2f(650,50);
   
    glEnd();

    //Draw "P"

    glBegin(GL_LINE_STRIP);   
   
    glVertex2f(670, 50);    
    glVertex2f(670,100);
    glVertex2f(700, 90);
    glVertex2f(700, 80);
    glVertex2f(670, 70);
   
    glEnd();
}

void displayFunc ( void )        //what to display on screen (only place to draw on screen)
{
    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );    //clears the screen (clear color and depth)

    // place your drawing code here

    drawPortrait();
   
    glColor3f( 1,0,1);                        //sets color to red (red, green, blue)   
//    glColor4f( 1,0,0, 0.5);                        //sets color to red and transparent (red, green, blue, transparency)
    glRectf( mouseX-5, mouseY-5, mouseX+5, mouseY+5 );    //draw a rectangle (to opposite coordinates)
   
    glutPostRedisplay();                        //redraw off screen buffer (allows for animation)
    glutSwapBuffers();                        //switch from off screen buffer to on screen buffer
}


void reshapeFunc ( int w, int h )    //resize the window
{
    windowW = w;                            //update global variables
    windowH = h;                           

    glViewport( 0, 0, w, h );                    //window coords, drawing region of window
    glMatrixMode( GL_PROJECTION );                //how the camera operates
    glLoadIdentity();                            //
    gluOrtho2D( 0,w,0,h );                        //

    glMatrixMode( GL_MODELVIEW );                    //defines what you're drawing
    glLoadIdentity();
}


void mouseDownFunc ( int button, int state, int x, int y )    //called when mouse is pressed (button = which button, state = up or down, x/y = position)
{
    mouseX = x;                                //set our global mouseX to x
    mouseY = windowH - y;                        //set our global mouseY to the invert of y

    if(state == 0){
        printf("    glVertex2f(%d,%d); \n", x, windowH - y);                    //prints out x, y
    }
}


void mouseMoveFunc ( int x, int y )                   
{
    mouseX = x;
    mouseY = windowH - y;
}


void mouseDragFunc ( int x, int y )
{
    mouseX = x;
    mouseY = windowH - y;
}


void keyboardFunc ( unsigned char key, int x, int y )        //called when a keyboard button is pressed
{
}


void arrowKeyFunc ( int a_keys, int x, int y )            //called when special keys are pressed (arrows, shift, etc)
{
}


void init ( GLvoid )                            //minimal amount of OpenGL initialization
{
    glShadeModel( GL_SMOOTH );
    glClearColor( 1.0, 1.0, 1.0, 1.0 );
    glEnable ( GL_COLOR_MATERIAL );
    glEnable( GL_BLEND );
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}


int main ( int argc, char** argv )                  //  * = pointer (** double pointer)
{
    glutInit( &argc, argv );                      // & = take the address of
   
    glutInitDisplayMode( GLUT_RGBA | GLUT_DOUBLE );      // double buffered
    glutInitWindowSize( windowW, windowH ); 

    // take other functions = callback   
   
    glutCreateWindow( "CompFormApp" );

    glutDisplayFunc( displayFunc );                   //display screen
    glutReshapeFunc( reshapeFunc );                //reshape window size
    glutMouseFunc( mouseDownFunc );                //mouse click
    glutMotionFunc( mouseDragFunc );                //dragging mouse
    glutPassiveMotionFunc( mouseMoveFunc );            //moving mouse
    glutKeyboardFunc( keyboardFunc );                //key down
    glutSpecialFunc( arrowKeyFunc );                //special case for arrow key presses/shift/etc.

    init();
   
    glutMainLoop( );                            //runs the glut environment, prevents program from reaching return
 
    return 0;                                //place holder return for main
}