rockbox/apps/plugins/dice.c

/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2005 by Brandon Low
 *
 * All files in this archive are subject to the GNU General Public License.
 * See the file COPYING in the source tree root for full license agreement.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/

#include "plugin.h"
#include "pluginlib_actions.h"

#define MAX_DICES 12
#define INITIAL_NB_DICES 1

#define DICE_QUIT PLA_QUIT
#define DICE_ROLL PLA_START

const struct button_mapping* plugin_contexts[]={generic_actions};

struct dices
{
    int values[MAX_DICES];
    int total;
    int nb_dices;
    int nb_sides;
};

#define PRINT_BUFFER_LENGTH MAX_DICES*4
PLUGIN_HEADER

static struct plugin_api* rb;

void dice_init(struct dices* dice);
void dice_roll(struct dices* dice);
void dice_print(struct dices* dice, struct screen* display);
bool dice_menu(struct dices* dice);

/* plugin entry point */
enum plugin_status plugin_start(struct plugin_api* api, void* parameter) {
    (void)parameter;
    rb = api;
    int i, action;
    struct dices dice;

    dice_init(&dice);
    rb->srand(*rb->current_tick);

    if(!dice_menu(&dice))
        return PLUGIN_OK;
    dice_roll(&dice);
    FOR_NB_SCREENS(i)
        dice_print( &dice, rb->screens[i] );
    while(true) {
        action = pluginlib_getaction(rb, TIMEOUT_BLOCK,
                                     plugin_contexts, 1);
        switch(action) {
            case DICE_ROLL:
                dice_roll(&dice);
                FOR_NB_SCREENS(i)
                    dice_print( &dice, rb->screens[i] );
                break;
            case DICE_QUIT:
                return PLUGIN_OK;
        }
    }
}

void dice_init(struct dices* dice){
    dice->nb_dices=INITIAL_NB_DICES;
}

void dice_roll(struct dices* dice) {
    int i;
    dice->total = 0;
    for (i=0; i<dice->nb_dices; i++) {
        dice->values[i] = rb->rand()%dice->nb_sides + 1;
        dice->total+=dice->values[i];
    }
}

void dice_print_string_buffer(struct dices* dice, char* buffer,
                              int start, int end){
    int i, written;
    for (i=start; i<end; i++) {
        written=rb->snprintf(buffer, PRINT_BUFFER_LENGTH,
                             " %3d", dice->values[i]);
        buffer=&(buffer[written]);
    }
}

void dice_print(struct dices* dice, struct screen* display){
    char buffer[PRINT_BUFFER_LENGTH];
    /* display characteristics */
    int char_height, char_width;
    display->getstringsize("M", &char_width, &char_height);
    int display_nb_row=display->height/char_height;
    int display_nb_col=display->width/char_width;

    int nb_dices_per_line=display_nb_col/4;/* 4 char per dice displayed*/
    int nb_lines_required=dice->nb_dices/nb_dices_per_line;
    int current_row=0;
    if(dice->nb_dices%nb_dices_per_line!=0)
        nb_lines_required++;
    display->clear_display();
    if(display_nb_row<nb_lines_required){
        /* Put everything on the same scrolling line */
        dice_print_string_buffer(dice, buffer, 0, dice->nb_dices);
        display->puts_scroll(0, current_row, buffer);
        current_row++;
    }else{
        int start=0;
        int end=0;
        for(;current_row<nb_lines_required;current_row++){
            end=start+nb_dices_per_line;
            if(end>dice->nb_dices)
                end=dice->nb_dices;
            dice_print_string_buffer(dice, buffer, start, end);
            display->puts(0, current_row, buffer);
            start=end;
        }
    }
    rb->snprintf(buffer, PRINT_BUFFER_LENGTH, "Total: %4d", dice->total);
    display->puts(0, current_row, buffer);
    display->update();
}

bool dice_menu(struct dices * dice) {
    int selection;
    int side_index;
    bool menu_quit = false, result = false;

    MENUITEM_STRINGLIST(menu,"Dice Menu",NULL,"Roll Dice","Number of Dice",
                        "Number of Sides","Quit");

    static struct opt_items nb_sides_option[8] = {
        { "3", -1 },
        { "4", -1 },
        { "6", -1 },
        { "8", -1 },
        { "10", -1 },
        { "12", -1 },
        { "20", -1 },
        { "100", -1 }
    };
    static int nb_sides_values[] = { 3, 4, 6, 8, 10, 12, 20, 100 };

    while (!menu_quit) {
        switch(rb->do_menu(&menu, &selection)){
            case 0:
                menu_quit = true;
                result = true;
                break;

            case 1:
                rb->set_int("Number of Dice", "", UNIT_INT, &(dice->nb_dices),
                            NULL, 1, 1, MAX_DICES, NULL );
                break;

            case 2:
                side_index=6;
                rb->set_option("Number of Sides", &side_index, INT, 
                               nb_sides_option,
                               sizeof(nb_sides_values)/sizeof(int), NULL);
                dice->nb_sides=nb_sides_values[side_index];
                break;

            default:
                menu_quit = true;
                result = false;
                break;
         }
    }
    return result;
}