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 4
  41 // TODO: wrap this mess up somewhere
  42 // TODO: knot graphics are missing
  43
  44 static GdkPixbuf* big_graphics[14];
  45 static GdkPixbuf* small_graphics[14];
  46 static GtkWidget* digits[5];
  47 static GtkWidget* unit_graphic;
  48
  49 #define IMAGE_PATH "/usr/share/speedometer/%d.png"
  50
  51 static void set_widget_bg_black(GtkWidget* widget) {
  52         g_assert(widget);
  53         GdkColor black;
  54         black.red = 0x0000;
  55         black.blue = 0x0000;
  56         black.green = 0x0000;
  57         gtk_widget_modify_bg(GTK_WIDGET(widget), GTK_STATE_NORMAL, &black);
  58 }
  59
  60
  61 /* Loads all the graphics from the disk and
  62  * scales the images down to be used in several
  63  * places. Might block for few seconds depending
  64  * on the load.
  65  */
  66 void load_graphics() {
  67         g_print("Loading and scaling images\n");
  68         guint i = 0;
  69
  70         /* This loop will load all the images from the disk
  71          * and store the pixbufs to the array. Pixbufs are
  72          * correct size to be used in the big digits.
  73          */
  74         while(i < 14) {
  75                 char* path = g_malloc(30);
  76                 g_sprintf(path, IMAGE_PATH, i);
  77                 g_print(path);
  78                 g_print("\n");
  79                 GError* error = NULL;
  80                 big_graphics[i] = gdk_pixbuf_new_from_file_at_scale(path,
  81                                 160,
  82                                 160,
  83                                 FALSE,
  84                                 &error);
  85                 if(error) {
  86                         g_print("Error loading big graphics: %s\n", error->message);
  87                         g_error_free(error);
  88                         error = NULL;
  89                 }
  90                 small_graphics[i] = gdk_pixbuf_new_from_file_at_scale(path,
  91                                                 120,
  92                                                 120,
  93                                                 FALSE,
  94                                                 &error);
  95                 if(error) {
  96                         g_print("Error loading small graphics: %s\n", error->message);
  97                         g_error_free(error);
  98                         error = NULL;
  99                 }
 100                 g_free(path);
 101                 i++;
 102         }
 103         g_print("Done\n");
 104 }
 105
 106 void set_digits_to_zero() {
 107         digits[0] = gtk_image_new_from_pixbuf(big_graphics[0]);
 108         digits[1] = gtk_image_new_from_pixbuf(big_graphics[0]);
 109         digits[2] = gtk_image_new_from_pixbuf(big_graphics[0]);
 110         digits[3] = gtk_image_new_from_pixbuf(small_graphics[0]);
 111         digits[4] = gtk_image_new_from_pixbuf(small_graphics[0]);
 112         // TODO: load this from GConf
 113         unit_graphic = gtk_image_new_from_pixbuf(small_graphics[11]);
 114 }
 115
 116 static void set_nth_digit(guint n, guint value) {
 117         g_assert(value < 10);
 118         g_assert(n < 5);
 119
 120         if(n < 3) {
 121                 GtkWidget* image = digits[n];
 122                 GdkPixbuf* buf = big_graphics[value];
 123                 gtk_image_set_from_pixbuf(GTK_IMAGE(image), buf);
 124         }
 125         else {
 126                 GtkWidget* image = digits[n];
 127                 GdkPixbuf* buf = small_graphics[value];
 128                 gtk_image_set_from_pixbuf(GTK_IMAGE(image), buf);
 129         }
 130 }
 131
 132 static void repaint_all_digits() {
 133         gtk_widget_queue_draw(GTK_WIDGET(digits[0]));
 134         gtk_widget_queue_draw(GTK_WIDGET(digits[1]));
 135         gtk_widget_queue_draw(GTK_WIDGET(digits[2]));
 136 }
 137
 138 void create_ui(AppData* appdata) {
 139         g_assert(appdata);
 140
 141         GtkWidget *hbox;
 142         GtkWidget *bhbox;
 143         GtkWidget *vbox;
 144
 145         vbox = gtk_vbox_new(FALSE, 0);
 146         hbox = gtk_hbox_new(TRUE, 0);
 147         bhbox = gtk_hbox_new(TRUE, 0);
 148
 149         GtkWidget* middle_e = gtk_event_box_new();
 150         GtkWidget* bottom_e = gtk_event_box_new();
 151
 152         g_signal_connect(G_OBJECT(middle_e),
 153                         "tap_and_hold",
 154                         G_CALLBACK(long_tap),
 155                         appdata);
 156         gtk_widget_tap_and_hold_setup(middle_e, NULL, NULL, 0);
 157
 158         g_signal_connect(G_OBJECT(middle_e),
 159                         "button_press_event",
 160                         G_CALLBACK(middle_event_box_button_press),
 161                         appdata);
 162
 163         g_signal_connect(G_OBJECT(appdata->window),
 164                         "delete_event",
 165                         G_CALLBACK(gtk_main_quit),
 166                         NULL);
 167
 168         g_signal_connect(G_OBJECT(appdata->window),
 169                         "key_press_event",
 170                         G_CALLBACK(key_press_cb),
 171                         appdata->window);
 172
 173         // add three big digits to the hbox
 174         gtk_box_pack_start(GTK_BOX(hbox), GTK_WIDGET(digits[0]), FALSE, FALSE, 0);
 175         gtk_box_pack_start(GTK_BOX(hbox), GTK_WIDGET(digits[1]), FALSE, FALSE, 0);
 176         gtk_box_pack_start(GTK_BOX(hbox), GTK_WIDGET(digits[2]), FALSE, FALSE, 0);
 177
 178         // add small digits to another hbox
 179         gtk_box_pack_start(GTK_BOX(bhbox), GTK_WIDGET(unit_graphic), FALSE, FALSE, 0);
 180         gtk_box_pack_start(GTK_BOX(bhbox), GTK_WIDGET(digits[3]), FALSE, FALSE, 0);
 181         gtk_box_pack_start(GTK_BOX(bhbox), GTK_WIDGET(digits[4]), FALSE, FALSE, 0);
 182
 183         // add hboxes to the event boxes
 184         gtk_container_add(GTK_CONTAINER(middle_e), hbox);
 185         gtk_container_add(GTK_CONTAINER(bottom_e), bhbox);
 186
 187         // add event boxes to the vbox
 188         //gtk_box_pack_start_defaults(GTK_BOX(vbox), top_e);
 189         gtk_box_pack_start_defaults(GTK_BOX(vbox), middle_e);
 190         gtk_box_pack_start_defaults(GTK_BOX(vbox), bottom_e);
 191
 192         // finally add the vertical box with all the children to the window
 193         gtk_container_add(GTK_CONTAINER(appdata->window), GTK_WIDGET(vbox));
 194
 195         // set backgrounds black
 196         set_widget_bg_black(GTK_WIDGET(appdata->window));
 197         set_widget_bg_black(bottom_e);
 198         //set_widget_bg_black(top_e);
 199         set_widget_bg_black(middle_e);
 200
 201         gtk_window_fullscreen(GTK_WINDOW(appdata->window));
 202         gtk_widget_show_all(GTK_WIDGET(appdata->window));
 203 }
 204
 205 void change_unit() {
 206         unit++;
 207
 208         if(unit >= UNIT_COUNT) {
 209                 unit = 0;
 210         }
 211         g_print("Unit used in conversion: %f\n", conversion[unit]);
 212
 213         GdkPixbuf* buf = small_graphics[10 + unit];
 214         gtk_image_set_from_pixbuf(GTK_IMAGE(unit_graphic), buf);
 215 }
 216
 217 void interpret_and_set_speed(gdouble speed) {
 218         g_assert(!isnan(speed));
 219
 220         /* speed is in m/s so let's convert
 221          * it to the unit that we are using
 222          */
 223         speed *= conversion[unit];
 224
 225         /* Convert float to a 6 digits (including dot) wide
 226          * string with leading zeros. After conversion
 227          * the speed looks like:
 228          *
 229          * 009.20 (9,20 km/h) or
 230          * 010.90 (10,90 km/h) or
 231          * 120.10 (120,10 km/h)
 232          *
 233          * Now, regardless of speed we know the position
 234          * of the digits and can access the array directly.
 235          */
 236         gchar* charspeed = g_malloc(10); // alloc
 237         g_sprintf(charspeed, "%0*.2f", 6, speed);
 238
 239         g_print("Speed is %s km/h\n", charspeed);
 240
 241         // these three lines will set the big digits
 242         set_nth_digit(0, g_ascii_digit_value(charspeed[0]));
 243         set_nth_digit(1, g_ascii_digit_value(charspeed[1]));
 244         set_nth_digit(2, g_ascii_digit_value(charspeed[2]));
 245
 246         // these two lines will set the small digits
 247         set_nth_digit(3, g_ascii_digit_value(charspeed[4]));
 248         set_nth_digit(4, g_ascii_digit_value(charspeed[5]));
 249
 250         repaint_all_digits();
 251
 252         g_free(charspeed);
 253 }
 254
 255 static void show_dialog() {
 256         GtkWidget *dialog = gtk_message_dialog_new(
 257                         NULL,
 258                         GTK_DIALOG_MODAL,
 259                         GTK_MESSAGE_INFO,
 260                         GTK_BUTTONS_OK,
 261                         "This program is licensed under GNU General Public License, "
 262                         "which means (among other things) that you don't have to pay "
 263                         "a dime for it. "
 264                         "If you think, however, that this software is worth it, you "
 265                         "can always drop me a postcard.\n\n"
 266                         "Wellu Mäkinen\n"
 267                         "Poste restante\n"
 268                         "33580 Tampere\n"
 269                         "FINLAND\n\n"
 270                         "PS. Long-tapping on the screen will close the program.");
 271         gtk_dialog_run(GTK_DIALOG(dialog));
 272         gtk_widget_destroy(dialog);
 273 }
 274
 275 void show_cardware_dialog() {
 276         GConfClient* client = gconf_client_get_default();
 277         g_assert(GCONF_IS_CLIENT(client));
 278
 279         GConfValue* gcvalue = NULL;
 280         gcvalue = gconf_client_get_without_default(client, GCONF_KEY, NULL);
 281
 282         if(gcvalue == NULL) {
 283                 g_print("GConf key not found so show dialog.\n");
 284                 show_dialog();
 285                 gconf_client_set_bool(client, GCONF_KEY, TRUE, NULL);
 286         }
 287         g_object_unref(client);
 288 }
 289