/* demo8b.c : demonstration de EZ-Draw
 *
 * Edouard.Thiel@lif.univ-mrs.fr - 24/03/2009 - version 1.0
 *
 * Compilation sous Unix :
 *     gcc -Wall demo8b.c ez-draw.c -o demo8b -L/usr/X11R6/lib -lX11 -lXext -lm
 * Compilation sous Windows :
 *     gcc -Wall demo8b.c ez-draw.c -o demo8b.exe -lgdi32 -lm
 *
 * This program is free software under the terms of the
 * GNU Lesser General Public License (LGPL) version 2.1.
*/

#include "ez-draw.h"
#include <math.h>

#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif

/* Fenetre 1 : une horloge tourne les aiguilles */

int cpt1 = 0, etat1 = 1, win1_w = 250, win1_h = 250, delay1 = 30;

void dessin_aiguille (Window win, unsigned long color, double angle,
    int xc, int yc, int d1, int d2, int ra)
{
    double a = (angle-90) * M_PI / 180, c = cos (a), s = sin (a),
           x1 = xc + c*d1, y1 = yc + s*d1, x2 = xc + c*d2, y2 = yc + s*d2,
           x3 = x1 - s*ra, y3 = y1 + c*ra, x4 = x1 + s*ra, y4 = y1 - c*ra,
           x5 = x2 - s*ra, y5 = y2 + c*ra, x6 = x2 + s*ra, y6 = y2 - c*ra;

    ez_set_color (color);
    ez_draw_line (win, x3, y3, x5, y5); ez_draw_line (win, x5, y5, x6, y6);
    ez_draw_line (win, x6, y6, x4, y4); ez_draw_line (win, x4, y4, x3, y3);
}

void win1_redessiner (Window win)
{
    double h = cpt1 / 60.0, m = cpt1 % 60;

    ez_set_color (ez_magenta); ez_set_nfont (2);
    ez_draw_text (win, EZ_TC, win1_w/2, 6, "%02d:%02d", (int) h, (int) m);

    dessin_aiguille (win, ez_red,  h*30, win1_w/2, win1_h/2, 20, 70, 10);
    dessin_aiguille (win, ez_blue, m* 6, win1_w/2, win1_h/2, 15, 92, 6);

    ez_set_color (ez_black); ez_set_nfont (0);
    ez_draw_text (win, EZ_BL, 8, win1_h-8, "espace : pause   q : quitter");
}

void win1_event (Ez_event *ev)        /* Appele'e a chaque evenement sur win1 */
{
    switch (ev->type) {

        case Expose :                              /* Il faut tout redessiner */
            win1_redessiner (ev->win);
            break;

        case TimerNotify :                  /* Le timer est arrive' a echance */
            cpt1 = (cpt1 + 1) % 720;
            ez_send_expose (ev->win);
            ez_start_timer (ev->win, delay1);          /* On re'arme le timer */
            break;

        case KeyPress :                           /* Une touche a ete pressee */
            switch (ev->key_sym) {
                case XK_q : ez_quit (); break;
                case XK_space : 
                    if (etat1) { etat1 = 0; ez_start_timer (ev->win, -1); }
                    else       { etat1 = 1; ez_start_timer (ev->win, delay1); }
                    break;
            }
            break;
    }
}


/* Fenetre 2 : une balle rebondit sur une raquette */

int ba_x = 100, ba_y = 100, ba_dx = 4, ba_dy = 3, win2_w = 280, win2_h = 180,
    delay2 = 20;

void avancer_balle (int x1, int y1, int x2, int y2)
{
    ba_x += ba_dx; ba_y += ba_dy;
    if (ba_x <= x1) { ba_x = x1; ba_dx = -ba_dx; }
    else if (ba_x >= x2) { ba_x = x2; ba_dx = -ba_dx; } 
    if (ba_y <= y1) { ba_y = y1; ba_dy = -ba_dy; }
    else if (ba_y >= y2) { ba_y = y2; ba_dy = -ba_dy; } 
}

void win2_redessiner (Window win)
{
    ez_set_color (ez_black);
    ez_draw_circle (win, ba_x-10, ba_y-10, ba_x+10, ba_y+10);

    ez_set_color (ez_blue);
    ez_fill_rectangle (win, ba_x-25, win2_h-8, ba_x+25, win2_h-3);
}

void win2_event (Ez_event *ev)        /* Appele'e a chaque evenement sur win2 */
{
    switch (ev->type) {

        case Expose :                              /* Il faut tout redessiner */
            win2_redessiner (ev->win);
            break;

        case TimerNotify :                  /* Le timer est arrive' a echance */
            avancer_balle (10, 10, win2_w-10, win2_h-19);
            ez_send_expose (ev->win);
            ez_start_timer (ev->win, delay2);          /* On re'arme le timer */
            break;

        case ConfigureNotify :  /* On recoit la nouvelle taille de la fenetre */
            win2_w = ev->width; win2_h = ev->height;
            break;
    }
}


int main ()
{
    Window win1, win2;

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

    win1 = ez_window_create (win1_w, win1_h, "Demo 8b : horloge", win1_event);
    win2 = ez_window_create (win2_w, win2_h, "Demo 8b : rebonds", win2_event);

    /* On associe un double-buffer d'affichage pour eviter tout clignotement */
    ez_window_dbuf (win1, 1);
    ez_window_dbuf (win2, 1);

    /* Provoque l'envoie d'un evenement TimerNotify dans delay millisecondes */
    ez_start_timer (win1, delay1);
    ez_start_timer (win2, delay2);

    ez_main_loop ();
    exit(0);
}