/* demo-06.c : demonstration de EZ-Draw
 *
 * Edouard.Thiel@lif.univ-mrs.fr - 21/06/2011 - version 1.2
 *
 * Compilation sous Unix :
 *     gcc -Wall demo-06.c ez-draw.c -o demo-06 -lX11 -lXext -L/usr/X11R6/lib
 * Compilation sous Windows :
 *     gcc -Wall demo-06.c ez-draw.c -o demo-06.exe -lgdi32
 *
 * This program is free software under the terms of the
 * GNU Lesser General Public License (LGPL) version 2.1.
*/

#include "ez-draw.h"

#define SOM_MAX 100
int som_nb = 0, som_x[SOM_MAX], som_y[SOM_MAX];


void sommet_vider ()
{
    som_nb = 0;
}


void sommet_ajouter (int x, int y)
{
    if (som_nb >= SOM_MAX) return;
    som_x[som_nb] = x;
    som_y[som_nb] = y;
    som_nb++;
}


void sommet_deplacer (int x, int y)
{
    if (som_nb <= 0 || som_nb >= SOM_MAX) return;
    som_x[som_nb-1] = x;
    som_y[som_nb-1] = y;
}


void sommet_dessiner (Ez_window win)
{
    int i;

    /* On dessine les sommets */
    ez_set_color (ez_blue);
    for (i = 0; i < som_nb; i++)
        ez_draw_rectangle (win, som_x[i]-2, som_y[i]-2, som_x[i]+2, som_y[i]+2);

    /* On relie les sommets par des segments */
    ez_set_color (ez_grey);
    for (i = 1; i < som_nb; i++)
        ez_draw_line (win, som_x[i-1], som_y[i-1], som_x[i], som_y[i]);
}


void win1_on_expose (Ez_event *ev)
{
    ez_set_color (ez_black);
    ez_draw_text (ev->win, EZ_TL, 10, 10,
        "Cliquez et tirez la souris dans la fenetre pour dessiner.\n"
        "Tapez sur espace pour vider la fenetre, 'q' pour quitter.");
    sommet_dessiner (ev->win);
}


void win1_on_button_press (Ez_event *ev)
{
    sommet_ajouter (ev->mx, ev->my);
    ez_send_expose (ev->win);
}


void win1_on_motion_notify (Ez_event *ev)
{
    if (ev->mb == 0) return;                       /* pas de bouton enfonce' */
    sommet_deplacer (ev->mx, ev->my);
    ez_send_expose (ev->win);
}


void win1_on_key_press (Ez_event *ev)
{
    switch (ev->key_sym) {
        case XK_q : 
            ez_quit (); 
            break;
        case XK_space : 
            sommet_vider ();
            ez_send_expose (ev->win); 
            break;
    }
}


void win1_event (Ez_event *ev)
{
    switch (ev->type) {
        case Expose       : win1_on_expose        (ev); break;
        case ButtonPress  : win1_on_button_press  (ev); break;
        case MotionNotify : win1_on_motion_notify (ev); break;
        case KeyPress     : win1_on_key_press     (ev); break;
    }
}


int main ()
{
    Ez_window win1;

    if (ez_init() < 0) exit(1);

    win1 = ez_window_create (400, 300, "Demo 06 : dessin a la souris", win1_event);

    /* On associe un double-buffer d'affichage pour eviter tout clignotement */
    ez_window_dbuf (win1, 1);

    ez_main_loop ();
    exit(0);
}