//------------------------------------------------------------|
//  This example tries to show the use of threads in C,       |
//  but it only runs on Windows, because of the windows.h     |
//  header file.                                              |
//  There's also one problem, I wanted to use the arrows,     |
//  But in order to use them, the user would have to let      |
//  pressed the arrow, 'cause the getch() function sometimes  |
//  returns different values, so, if you wanna play whit it a |
//  little bit, just uncomment the part where says 'Using the |
//  arrows' and comment the par where says 'Without arrows'.  |
//                                                            |
//  You will also need to have 'myconio.h' in the same        |
//  directory of this program.                                |
//                                                            |
//  Author: Juan Francisco Benavides Nanni.                   |
//  mail: elnanni@gmail.com                                   |
//  URL: http://mmabj.tk                                      |
//  date: 29/12/2005                                          |
//------------------------------------------------------------|

#include <windows.h>
#include "myconio.h"

#define MAXWIDX 20
#define MAXWIDY 20
#define MIN 0
#define CENTER 10

//  Without arrows.
#define UP 115
#define DOWN 120
#define LEFT 122
#define RIG 99

//  Using the arrows.
/*
#define UP 72
#define DOWN 80
#define LEFT 75
#define RIG 77
*/

//Please don't modify this value.
#define SALE 27

void thread_move(int *param);

int main(){
    int opc, last, x, y;
    char car = ':';
	HANDLE handle;
    opc = UP;
    x = y = CENTER;
    while(1){
        if(opc == SALE) break;
        clrscr();
        printf("Welcome to the 'try of nibbles' game.\n\n");
        printf("UP = %c, DOWN = %c, LEFT = %c, RIGHT = %c, EXIT = <Esc>.\n\n"
        , UP, DOWN, LEFT, RIG, SALE);
        gotoxy(x, y);
        printf("%c", car);
        switch(opc){
            case UP:
                if(y > MIN) y -= 1;
                else y = y;
                car = ':';
                break;
            case DOWN:
                if(y < MAXWIDY) y += 1;
                else y = y;
                car = ':';
                break;
            case LEFT:
                if(x > MIN) x -= 1;
                else x = x;
                car = '-';
                break;
            case RIG:
                if(x < MAXWIDX) x += 1;
                else x = x;
                car = '-';
                break;
            case SALE:
                break;
            default:
                opc = last;
        }
        last = opc;
        handle = (HANDLE) _beginthread(thread_move, 0, &opc);
        WaitForSingleObject(handle, 1);
    }
}

void thread_move(int *param){
    (int) * param = (int) getch();
	_endthread();
}