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(path, &error);
  81                 if(error) {
  82                         g_print("Error loading graphics: %s\n", error->message);
  83                         g_error_free(error);
  84                         error = NULL;
  85                 }
  86                 g_free(path);
  87
  88                 small_graphics[i] = gdk_pixbuf_scale_simple(
  89                                 big_graphics[i],
  90                                 150,
  91                                 150,
  92                                 GDK_INTERP_BILINEAR);
  93
  94                 i++;
  95         }
  96         g_print("Done\n");
  97 }
  98
  99 void set_digits_to_zero() {
 100         digits[0] = gtk_image_new_from_pixbuf(big_graphics[0]);
 101         digits[1] = gtk_image_new_from_pixbuf(big_graphics[0]);
 102         digits[2] = gtk_image_new_from_pixbuf(big_graphics[0]);
 103         digits[3] = gtk_image_new_from_pixbuf(small_graphics[0]);
 104         digits[4] = gtk_image_new_from_pixbuf(small_graphics[0]);
 105         // TODO: load this from GConf
 106         unit_graphic = gtk_image_new_from_pixbuf(small_graphics[11]);
 107 }
 108
 109 static void set_nth_digit(guint n, guint value) {
 110         g_assert(value < 10);
 111         g_assert(n < 5);
 112
 113         if(n < 3) {
 114                 GtkWidget* image = digits[n];
 115                 GdkPixbuf* buf = big_graphics[value];
 116                 gtk_image_set_from_pixbuf(GTK_IMAGE(image), buf);
 117         }
 118         else {
 119                 GtkWidget* image = digits[n];
 120                 GdkPixbuf* buf = small_graphics[value];
 121                 gtk_image_set_from_pixbuf(GTK_IMAGE(image), buf);
 122         }
 123 }
 124
 125 static void repaint_all_digits() {
 126         gtk_widget_queue_draw(GTK_WIDGET(digits[0]));
 127         gtk_widget_queue_draw(GTK_WIDGET(digits[1]));
 128         gtk_widget_queue_draw(GTK_WIDGET(digits[2]));
 129 }
 130
 131 void create_ui(AppData* appdata) {
 132         g_assert(appdata);
 133
 134         GtkWidget *hbox;
 135         GtkWidget *bhbox;
 136         GtkWidget *vbox;
 137
 138         vbox = gtk_vbox_new(FALSE, 0);
 139         hbox = gtk_hbox_new(TRUE, 0);
 140         bhbox = gtk_hbox_new(TRUE, 0);
 141
 142         GtkWidget* top_e = gtk_event_box_new();
 143         GtkWidget* middle_e = gtk_event_box_new();
 144         GtkWidget* bottom_e = gtk_event_box_new();
 145
 146         g_signal_connect(G_OBJECT(top_e),
 147                         "button_press_event",
 148                         G_CALLBACK(top_event_box_button_press),
 149                         appdata);
 150
 151         g_signal_connect(G_OBJECT(middle_e),
 152                         "button_press_event",
 153                         G_CALLBACK(middle_event_box_button_press),
 154                         appdata);
 155
 156         g_signal_connect(G_OBJECT(bottom_e),
 157                         "button_press_event",
 158                         G_CALLBACK(bottom_event_box_button_press),
 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         gtk_box_pack_start(GTK_BOX(hbox), GTK_WIDGET(digits[0]), FALSE, FALSE, 0);
 173         gtk_box_pack_start(GTK_BOX(hbox), GTK_WIDGET(digits[1]), FALSE, FALSE, 0);
 174         gtk_box_pack_start(GTK_BOX(hbox), GTK_WIDGET(digits[2]), FALSE, FALSE, 0);
 175
 176         // add small digits to another hbox
 177         gtk_box_pack_start(GTK_BOX(bhbox), GTK_WIDGET(unit_graphic), FALSE, FALSE, 0);
 178         gtk_box_pack_start(GTK_BOX(bhbox), GTK_WIDGET(digits[3]), FALSE, FALSE, 0);
 179         gtk_box_pack_start(GTK_BOX(bhbox), GTK_WIDGET(digits[4]), FALSE, FALSE, 0);
 180
 181         // add hboxes to the event boxes
 182         gtk_container_add(GTK_CONTAINER(middle_e), hbox);
 183         gtk_container_add(GTK_CONTAINER(bottom_e), bhbox);
 184
 185         // add event boxes to the vbox
 186         gtk_box_pack_start_defaults(GTK_BOX(vbox), top_e);
 187         gtk_box_pack_start_defaults(GTK_BOX(vbox), middle_e);
 188         gtk_box_pack_start_defaults(GTK_BOX(vbox), bottom_e);
 189
 190         // finally add the vertical box with all the children to the window
 191         gtk_container_add(GTK_CONTAINER(appdata->window), GTK_WIDGET(vbox));
 192
 193         // set backgrounds black
 194         set_widget_bg_black(GTK_WIDGET(appdata->window));
 195         set_widget_bg_black(bottom_e);
 196         set_widget_bg_black(top_e);
 197         set_widget_bg_black(middle_e);
 198
 199         gtk_window_fullscreen(GTK_WINDOW(appdata->window));
 200         gtk_widget_show_all(GTK_WIDGET(appdata->window));
 201 }
 202
 203 void change_unit() {
 204         unit++;
 205
 206         if(unit >= UNIT_COUNT) {
 207                 unit = 0;
 208         }
 209         g_print("Unit used in conversion: %f\n", conversion[unit]);
 210
 211         GdkPixbuf* buf = small_graphics[10 + unit];
 212         gtk_image_set_from_pixbuf(GTK_IMAGE(unit_graphic), buf);
 213 }
 214
 215 void interpret_and_set_speed(gdouble speed) {
 216         g_assert(!isnan(speed));
 217
 218         /* speed is in m/s so let's convert
 219          * it to the unit that we are using
 220          */
 221         speed *= conversion[unit];
 222
 223         /* Convert float to a 6 digits (including dot) wide
 224          * string with leading zeros. After conversion
 225          * the speed looks like:
 226          *
 227          * 009.20 (9,20 km/h) or
 228          * 010.90 (10,90 km/h) or
 229          * 120.10 (120,10 km/h)
 230          *
 231          * Now, regardless of speed we know the position
 232          * of the digits and can access the array directly.
 233          */
 234         gchar* charspeed = g_malloc(10); // alloc
 235         g_sprintf(charspeed, "%0*.2f", 6, speed);
 236
 237         g_print("Speed is %s km/h\n", charspeed);
 238
 239         // these three lines will set the big digits
 240         set_nth_digit(0, g_ascii_digit_value(charspeed[0]));
 241         set_nth_digit(1, g_ascii_digit_value(charspeed[1]));
 242         set_nth_digit(2, g_ascii_digit_value(charspeed[2]));
 243
 244         // these two lines will set the small digits
 245         set_nth_digit(3, g_ascii_digit_value(charspeed[4]));
 246         set_nth_digit(4, g_ascii_digit_value(charspeed[5]));
 247
 248         repaint_all_digits();
 249
 250         g_free(charspeed);
 251 }
 252
 253 static void show_dialog() {
 254         GtkWidget *dialog = gtk_message_dialog_new(
 255                         NULL,
 256                         GTK_DIALOG_MODAL,
 257                         GTK_MESSAGE_INFO,
 258                         GTK_BUTTONS_OK,
 259                         "This program is licensed under GNU General Public License, "
 260                         "which means (among other things) that you don't have to pay "
 261                         "a dime for it. "
 262                         "If you think, however, that this software is worth it, you "
 263                         "can always drop me a postcard.\n\n"
 264                         "Wellu Mäkinen\n"
 265                         "PO BOX\n"
 266                         "33580 Tampere\n"
 267                         "FINLAND");
 268         gtk_dialog_run(GTK_DIALOG(dialog));
 269         gtk_widget_destroy(dialog);
 270 }
 271
 272 void show_cardware_dialog() {
 273         GConfClient* client = gconf_client_get_default();
 274         g_assert(GCONF_IS_CLIENT(client));
 275
 276         GConfValue* gcvalue = NULL;
 277         gcvalue = gconf_client_get_without_default(client, GCONF_KEY, NULL);
 278
 279         if(gcvalue == NULL) {
 280                 g_print("GConf key not found so show dialog.\n");
 281                 show_dialog();
 282                 gconf_client_set_bool(client, GCONF_KEY, TRUE, NULL);
 283         }
 284         g_object_unref(client);
 285 }
 286