git.maemo.org Git - speedometer/blob - ui.c

   1 /****
   2         Speedometer, shows your current speed using GPS
   3         Copyright (C) 2008 Wellu Mäkinen <wellu@wellu.org>
   4
   5         This program is free software: you can redistribute it and/or modify
   6         it under the terms of the GNU General Public License as published by
   7         the Free Software Foundation, either version 3 of the License, or
   8         (at your option) any later version.
   9
  10         This program is distributed in the hope that it will be useful,
  11         but WITHOUT ANY WARRANTY; without even the implied warranty of
  12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13         GNU General Public License for more details.
  14
  15         You should have received a copy of the GNU General Public License
  16         along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  ****/
  18
  19 #include <gtk/gtk.h>
  20 #include <glib/gprintf.h>
  21 #include <gdk-pixbuf/gdk-pixbuf.h>
  22 #include <math.h>
  23 #include <gconf/gconf-client.h>
  24
  25 #include "ui.h"
  26 #include "callbacks.h"
  27
  28 #define GCONF_KEY "/apps/Maemo/speedometer/disclaimer"
  29
  30 /* This is used when converting to other units
  31  * number represents a multiplier which is used
  32  * when converting the base unit to other units.
  33  * Base unit is m/s thus the first multiplier is
  34  * one. Units are in following order:
  35  *
  36  * m/s, km/h, mph, f/s, knot
  37  */
  38 gdouble conversion[] = { 1, 3.6, 2.237, 3.281, 1.944 };
  39 guint unit = 1;
  40 #define UNIT_COUNT 5
  41 // TODO: wrap this mess up somewhere
  42
  43 static GdkPixbuf* big_graphics[15];
  44 static GdkPixbuf* small_graphics[15];
  45 static GtkWidget* digits[5];
  46 static GtkWidget* unit_graphic;
  47
  48 #define IMAGE_PATH "/usr/share/speedometer/%d.png"
  49
  50 static void set_widget_bg_black(GtkWidget* widget) {
  51         g_assert(widget);
  52         GdkColor black;
  53         black.red = 0x0000;
  54         black.blue = 0x0000;
  55         black.green = 0x0000;
  56         gtk_widget_modify_bg(GTK_WIDGET(widget), GTK_STATE_NORMAL, &black);
  57 }
  58
  59
  60 /* Loads all the graphics from the disk and
  61  * scales the images down to be used in several
  62  * places. Might block for few seconds depending
  63  * on the load.
  64  */
  65 void load_graphics() {
  66         g_print("Loading and scaling images\n");
  67         guint i = 0;
  68
  69         /* This loop will load all the images from the disk
  70          * and store the pixbufs to the array. Pixbufs are
  71          * correct size to be used in the big digits.
  72          */
  73         while(i < 15) {
  74                 char* path = g_malloc(30);
  75                 g_sprintf(path, IMAGE_PATH, i);
  76                 g_print(path);
  77                 g_print("\n");
  78                 GError* error = NULL;
  79                 big_graphics[i] = gdk_pixbuf_new_from_file_at_scale(path,
  80                                 160,
  81                                 160,
  82                                 FALSE,
  83                                 &error);
  84                 if(error) {
  85                         g_print("Error loading big graphics: %s\n", error->message);
  86                         g_error_free(error);
  87                         error = NULL;
  88                 }
  89                 small_graphics[i] = gdk_pixbuf_new_from_file_at_scale(path,
  90                                                 120,
  91                                                 120,
  92                                                 FALSE,
  93                                                 &error);
  94                 if(error) {
  95                         g_print("Error loading small graphics: %s\n", error->message);
  96                         g_error_free(error);
  97                         error = NULL;
  98                 }
  99                 g_free(path);
 100                 i++;
 101         }
 102         g_print("Done\n");
 103 }
 104
 105 void set_digits_to_zero() {
 106         digits[0] = gtk_image_new_from_pixbuf(big_graphics[0]);
 107         digits[1] = gtk_image_new_from_pixbuf(big_graphics[0]);
 108         digits[2] = gtk_image_new_from_pixbuf(big_graphics[0]);
 109         digits[3] = gtk_image_new_from_pixbuf(small_graphics[0]);
 110         digits[4] = gtk_image_new_from_pixbuf(small_graphics[0]);
 111         // TODO: load this from GConf
 112         unit_graphic = gtk_image_new_from_pixbuf(small_graphics[11]);
 113 }
 114
 115 static void set_nth_digit(guint n, guint value) {
 116         g_assert(value < 10);
 117         g_assert(n < 5);
 118
 119         if(n < 3) {
 120                 GtkWidget* image = digits[n];
 121                 GdkPixbuf* buf = big_graphics[value];
 122                 gtk_image_set_from_pixbuf(GTK_IMAGE(image), buf);
 123         }
 124         else {
 125                 GtkWidget* image = digits[n];
 126                 GdkPixbuf* buf = small_graphics[value];
 127                 gtk_image_set_from_pixbuf(GTK_IMAGE(image), buf);
 128         }
 129 }
 130
 131 static void repaint_all_digits() {
 132         gtk_widget_queue_draw(GTK_WIDGET(digits[0]));
 133         gtk_widget_queue_draw(GTK_WIDGET(digits[1]));
 134         gtk_widget_queue_draw(GTK_WIDGET(digits[2]));
 135 }
 136
 137 void create_ui(AppData* appdata) {
 138         g_assert(appdata);
 139
 140         GtkWidget *top_hbox;
 141         GtkWidget *bottom_hbox;
 142         GtkWidget *vbox;
 143
 144         vbox = gtk_vbox_new(FALSE, 0);
 145         top_hbox = gtk_hbox_new(TRUE, 0);
 146         bottom_hbox = gtk_hbox_new(TRUE, 0);
 147
 148         GtkWidget* event_box = gtk_event_box_new();
 149
 150         g_signal_connect(G_OBJECT(event_box),
 151                         "tap_and_hold",
 152                         G_CALLBACK(long_tap),
 153                         appdata);
 154         gtk_widget_tap_and_hold_setup(event_box, NULL, NULL, 0);
 155
 156         g_signal_connect(G_OBJECT(event_box),
 157                         "button_press_event",
 158                         G_CALLBACK(short_tap),
 159                         appdata);
 160
 161         g_signal_connect(G_OBJECT(appdata->window),
 162                         "delete_event",
 163                         G_CALLBACK(gtk_main_quit),
 164                         NULL);
 165
 166         g_signal_connect(G_OBJECT(appdata->window),
 167                         "key_press_event",
 168                         G_CALLBACK(key_press_cb),
 169                         appdata->window);
 170
 171         // add three big digits to the hbox
 172         // creates the top row where big digits are placed
 173         gtk_box_pack_start(GTK_BOX(top_hbox), GTK_WIDGET(digits[0]), FALSE, FALSE, 0);
 174         gtk_box_pack_start(GTK_BOX(top_hbox), GTK_WIDGET(digits[1]), FALSE, FALSE, 0);
 175         gtk_box_pack_start(GTK_BOX(top_hbox), GTK_WIDGET(digits[2]), FALSE, FALSE, 0);
 176
 177         // add small digits to another hbox
 178         // creates the bottom row with decimals and unit graphic
 179         gtk_box_pack_start(GTK_BOX(bottom_hbox), GTK_WIDGET(unit_graphic), FALSE, FALSE, 0);
 180         gtk_box_pack_start(GTK_BOX(bottom_hbox), GTK_WIDGET(digits[3]), FALSE, FALSE, 0);
 181         gtk_box_pack_start(GTK_BOX(bottom_hbox), GTK_WIDGET(digits[4]), FALSE, FALSE, 0);
 182
 183         // add event boxes to the vbox
 184         gtk_box_pack_start_defaults(GTK_BOX(vbox), top_hbox);
 185         gtk_box_pack_start_defaults(GTK_BOX(vbox), bottom_hbox);
 186
 187         // add vertival box to the event box
 188         gtk_container_add(GTK_CONTAINER(event_box), GTK_WIDGET(vbox));
 189
 190         // finally add the event box with all the children to the window
 191         gtk_container_add(GTK_CONTAINER(appdata->window), GTK_WIDGET(event_box));
 192
 193         // set backgrounds black
 194         set_widget_bg_black(GTK_WIDGET(appdata->window));
 195         set_widget_bg_black(event_box);
 196
 197         gtk_window_fullscreen(GTK_WINDOW(appdata->window));
 198         gtk_widget_show_all(GTK_WIDGET(appdata->window));
 199 }
 200
 201 void change_unit() {
 202         unit++;
 203
 204         if(unit >= UNIT_COUNT) {
 205                 unit = 0;
 206         }
 207         g_print("Unit used in conversion: %f\n", conversion[unit]);
 208
 209         GdkPixbuf* buf = small_graphics[10 + unit];
 210         gtk_image_set_from_pixbuf(GTK_IMAGE(unit_graphic), buf);
 211 }
 212
 213 void interpret_and_set_speed(gdouble speed) {
 214         g_assert(!isnan(speed));
 215
 216         /* speed is in m/s so let's convert
 217          * it to the unit that we are using
 218          */
 219         speed *= conversion[unit];
 220
 221         /* we need to limit the speed down to
 222          * less than 1000 whatever or else hell
 223          * breaks loose in the form of assert
 224          */
 225         if(!(fabs(speed) < 1000)) {
 226             g_print("Ahem, may I suggest to limit the speed (%f) a bit, Sir.\n", speed);
 227             speed = 0;
 228         }
 229
 230         /* Convert float to a 6 digits (including dot) wide
 231          * string with leading zeros. After conversion
 232          * the speed looks like:
 233          *
 234          * 009.20 (9,20 km/h) or
 235          * 010.90 (10,90 km/h) or
 236          * 120.10 (120,10 km/h)
 237          *
 238          * Now, regardless of speed we know the position
 239          * of the digits and can access the array directly.
 240          */
 241         gchar* charspeed = g_malloc(10); // alloc
 242         g_sprintf(charspeed, "%0*.2f", 6, speed);
 243
 244         g_print("Speed is %s km/h\n", charspeed);
 245
 246         // these three lines will set the big digits
 247         set_nth_digit(0, g_ascii_digit_value(charspeed[0]));
 248         set_nth_digit(1, g_ascii_digit_value(charspeed[1]));
 249         set_nth_digit(2, g_ascii_digit_value(charspeed[2]));
 250
 251         // these two lines will set the small digits
 252         set_nth_digit(3, g_ascii_digit_value(charspeed[4]));
 253         set_nth_digit(4, g_ascii_digit_value(charspeed[5]));
 254
 255         repaint_all_digits();
 256
 257         g_free(charspeed);
 258 }
 259
 260 static void show_dialog() {
 261         GtkWidget *dialog = gtk_message_dialog_new(
 262                         NULL,
 263                         GTK_DIALOG_MODAL,
 264                         GTK_MESSAGE_INFO,
 265                         GTK_BUTTONS_OK,
 266                         "This program is licensed under GNU General Public License, "
 267                         "which means (among other things) that you don't have to pay "
 268                         "a dime for it. "
 269                         "PS. Long-tapping on the screen will quit the program.");
 270         gtk_dialog_run(GTK_DIALOG(dialog));
 271         gtk_widget_destroy(dialog);
 272 }
 273
 274 void show_cardware_dialog() {
 275         GConfClient* client = gconf_client_get_default();
 276         g_assert(GCONF_IS_CLIENT(client));
 277
 278         GConfValue* gcvalue = NULL;
 279         gcvalue = gconf_client_get_without_default(client, GCONF_KEY, NULL);
 280
 281         if(gcvalue == NULL) {
 282                 g_print("GConf key not found so show dialog.\n");
 283                 show_dialog();
 284                 gconf_client_set_bool(client, GCONF_KEY, TRUE, NULL);
 285         }
 286         g_object_unref(client);
 287 }
 288