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
  37  */
  38 gdouble conversion[] = { 1, 3.6, 2.237 };
  39
  40 static GdkPixbuf* big_graphics[10];                     // contains all the big graphics
  41 static GdkPixbuf* small_graphics[10];   // contains small graphics
  42 static GtkWidget* digits[5];            //
  43
  44 #define IMAGE_PATH "/usr/share/speedometer/%d.png"
  45
  46 static void set_widget_bg_black(GtkWidget* widget) {
  47         g_assert(widget);
  48         GdkColor black;
  49         black.red = 0x0000;
  50         black.blue = 0x0000;
  51         black.green = 0x0000;
  52         gtk_widget_modify_bg(GTK_WIDGET(widget), GTK_STATE_NORMAL, &black);
  53 }
  54
  55
  56 /* Loads all the graphics from the disk and
  57  * scales the images down to be used in several
  58  * places. Might block for few seconds depending
  59  * on the load.
  60  */
  61 void load_graphics() {
  62         g_print("Loading and scaling images\n");
  63         guint i = 0;
  64
  65         /* This loop will load all the images from the disk
  66          * and store the pixbufs to the array. Pixbufs are
  67          * correct size to be used in the big digits.
  68          */
  69         while(i < 10) {
  70                 char* path = g_malloc(30);
  71                 g_sprintf(path, IMAGE_PATH, i);
  72                 g_print(path);
  73                 g_print("\n");
  74                 GError* error = NULL;
  75                 big_graphics[i] = gdk_pixbuf_new_from_file(path, &error);
  76                 if(error) {
  77                         g_print("Error loading graphics: %s\n", error->message);
  78                         g_error_free(error);
  79                         error = NULL;
  80                 }
  81                 g_free(path);
  82
  83                 small_graphics[i] = gdk_pixbuf_scale_simple(
  84                                 big_graphics[i],
  85                                 60,
  86                                 60,
  87                                 GDK_INTERP_BILINEAR);
  88
  89                 i++;
  90         }
  91         g_print("Done\n");
  92 }
  93
  94 void set_digits_to_zero() {
  95         digits[0] = gtk_image_new_from_pixbuf(big_graphics[0]);
  96         digits[1] = gtk_image_new_from_pixbuf(big_graphics[0]);
  97         digits[2] = gtk_image_new_from_pixbuf(big_graphics[0]);
  98         digits[3] = gtk_image_new_from_pixbuf(small_graphics[0]);
  99         digits[4] = gtk_image_new_from_pixbuf(small_graphics[0]);
 100 }
 101
 102 static void set_nth_digit(guint n, guint value) {
 103         g_assert(value < 10);
 104         g_assert(n < 5);
 105
 106         if(n < 3) {
 107                 GtkWidget* image = digits[n];
 108                 GdkPixbuf* buf = big_graphics[value];
 109                 gtk_image_set_from_pixbuf(GTK_IMAGE(image), buf);
 110         }
 111         else {
 112                 GtkWidget* image = digits[n];
 113                 GdkPixbuf* buf = small_graphics[value];
 114                 gtk_image_set_from_pixbuf(GTK_IMAGE(image), buf);
 115         }
 116 }
 117
 118 static void repaint_all_digits() {
 119         gtk_widget_queue_draw(GTK_WIDGET(digits[0]));
 120         gtk_widget_queue_draw(GTK_WIDGET(digits[1]));
 121         gtk_widget_queue_draw(GTK_WIDGET(digits[2]));
 122 }
 123
 124 void create_ui(AppData* appdata) {
 125         g_assert(appdata);
 126
 127         GtkWidget *hbox;
 128         GtkWidget *bhbox;
 129         GtkWidget *vbox;
 130
 131         vbox = gtk_vbox_new(FALSE, 0);
 132         hbox = gtk_hbox_new(TRUE, 0);
 133         bhbox = gtk_hbox_new(TRUE, 0);
 134
 135         GtkWidget* top_e = gtk_event_box_new();
 136         GtkWidget* middle_e = gtk_event_box_new();
 137         GtkWidget* bottom_e = gtk_event_box_new();
 138
 139         g_signal_connect(G_OBJECT(top_e),
 140                         "button_press_event",
 141                         G_CALLBACK(top_event_box_button_press),
 142                         appdata);
 143
 144         g_signal_connect(G_OBJECT(middle_e),
 145                         "button_press_event",
 146                         G_CALLBACK(middle_event_box_button_press),
 147                         appdata);
 148
 149         g_signal_connect(G_OBJECT(bottom_e),
 150                         "button_press_event",
 151                         G_CALLBACK(bottom_event_box_button_press),
 152                         appdata);
 153
 154         g_signal_connect(G_OBJECT(appdata->window),
 155                         "delete_event",
 156                         G_CALLBACK(gtk_main_quit),
 157                         NULL);
 158
 159         g_signal_connect(G_OBJECT(appdata->window),
 160                         "key_press_event",
 161                         G_CALLBACK(key_press_cb),
 162                         appdata->window);
 163
 164         // add three big digits to the hbox
 165         gtk_box_pack_start(GTK_BOX(hbox), GTK_WIDGET(digits[0]), FALSE, FALSE, 0);
 166         gtk_box_pack_start(GTK_BOX(hbox), GTK_WIDGET(digits[1]), FALSE, FALSE, 0);
 167         gtk_box_pack_start(GTK_BOX(hbox), GTK_WIDGET(digits[2]), FALSE, FALSE, 0);
 168
 169         // add small digits to another hbox
 170         gtk_box_pack_start(GTK_BOX(bhbox), GTK_WIDGET(digits[3]), FALSE, FALSE, 0);
 171         gtk_box_pack_start(GTK_BOX(bhbox), GTK_WIDGET(digits[4]), FALSE, FALSE, 0);
 172
 173         // add hboxes to the event boxes
 174         gtk_container_add(GTK_CONTAINER(middle_e), hbox);
 175         gtk_container_add(GTK_CONTAINER(bottom_e), bhbox);
 176
 177         // add event boxes to the vbox
 178         gtk_box_pack_start_defaults(GTK_BOX(vbox), top_e);
 179         gtk_box_pack_start_defaults(GTK_BOX(vbox), middle_e);
 180         gtk_box_pack_start_defaults(GTK_BOX(vbox), bottom_e);
 181
 182         // finally add the vertical box with all the children to the window
 183         gtk_container_add(GTK_CONTAINER(appdata->window), GTK_WIDGET(vbox));
 184
 185         // set backgrounds black
 186         set_widget_bg_black(GTK_WIDGET(appdata->window));
 187         set_widget_bg_black(bottom_e);
 188         set_widget_bg_black(top_e);
 189         set_widget_bg_black(middle_e);
 190
 191         gtk_window_fullscreen(GTK_WINDOW(appdata->window));
 192         gtk_widget_show_all(GTK_WIDGET(appdata->window));
 193 }
 194
 195 void interpret_and_set_speed(gdouble speed) {
 196         g_assert(!isnan(speed));
 197
 198         /* speed is in m/s so let's convert
 199          * it to the unit that we are using
 200          */
 201         speed *= conversion[1];
 202
 203         /* Convert float to a 6 digits (including dot) wide
 204          * string with leading zeros. After conversion
 205          * the speed might look like:
 206          *
 207          * 009.20 (9,20 km/h) or
 208          * 010.90 (10,90 km/h) or
 209          * 120.10 (120,10 km/h)
 210          *
 211          * Now, regardless of speed we know the position
 212          * of the digits and can access the array directly.
 213          */
 214         gchar* charspeed = g_malloc(10); // alloc
 215         g_sprintf(charspeed, "%0*.2f", 6, speed);
 216
 217         g_print("Speed is %s km/h\n", charspeed);
 218
 219         // these three lines will set the big digits
 220         set_nth_digit(0, g_ascii_digit_value(charspeed[0]));
 221         set_nth_digit(1, g_ascii_digit_value(charspeed[1]));
 222         set_nth_digit(2, g_ascii_digit_value(charspeed[2]));
 223
 224         // these two lines will set the small digits
 225         set_nth_digit(3, g_ascii_digit_value(charspeed[4]));
 226         set_nth_digit(4, g_ascii_digit_value(charspeed[5]));
 227
 228         repaint_all_digits();
 229
 230         g_free(charspeed);
 231 }
 232
 233 static void show_dialog() {
 234         GtkWidget *dialog = gtk_message_dialog_new(
 235                         NULL,
 236                         GTK_DIALOG_MODAL,
 237                         GTK_MESSAGE_INFO,
 238                         GTK_BUTTONS_OK,
 239                         "This program is licensed under GNU General Public License, "
 240                         "which means (among other things) that you don't have to pay "
 241                         "a dime for it. "
 242                         "If you think, however, that this software is worth it, you "
 243                         "can always drop me a postcard.\n\n"
 244                         "Wellu Mäkinen\n"
 245                         "PO BOX\n"
 246                         "33580 Tampere\n"
 247                         "FINLAND");
 248         gtk_dialog_run(GTK_DIALOG(dialog));
 249         gtk_widget_destroy(dialog);
 250 }
 251
 252 void show_cardware_dialog() {
 253         GConfClient* client = gconf_client_get_default();
 254         g_assert(GCONF_IS_CLIENT(client));
 255
 256         GConfValue* gcvalue = NULL;
 257         gcvalue = gconf_client_get_without_default(client, GCONF_KEY, NULL);
 258
 259         if(gcvalue == NULL) {
 260                 g_print("GConf key not found so show dialog.\n");
 261                 show_dialog();
 262                 gconf_client_set_bool(client, GCONF_KEY, TRUE, NULL);
 263         }
 264         g_object_unref(client);
 265 }
 266