Pileus Git - grits/blob - src/plugin-ridge.c

   1 /*
   2  * Copyright (C) 2009 Andy Spencer <spenceal@rose-hulman.edu>
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <config.h>
  19 #include <gtk/gtk.h>
  20 #include <curl/curl.h>
  21 #include <GL/gl.h>
  22
  23 #include <stdio.h>
  24
  25 #include "aweather-gui.h"
  26 #include "data.h"
  27
  28 enum {
  29         LAYER_TOPO,
  30         LAYER_COUNTY,
  31         LAYER_RIVERS,
  32         LAYER_HIGHWAYS,
  33         LAYER_CITY,
  34         LAYER_COUNT
  35 };
  36
  37 typedef struct {
  38         gchar *name;
  39         gchar *fmt;
  40         gboolean enabled;
  41         float z;
  42         guint tex;
  43 } layer_t;
  44
  45 static layer_t layers[] = {
  46         [LAYER_TOPO]     = { "Topo",     "Overlays/" "Topo/"     "Short/" "%s_Topo_Short.jpg",     TRUE,  1, 0 },
  47         [LAYER_COUNTY]   = { "Counties", "Overlays/" "County/"   "Short/" "%s_County_Short.gif",   TRUE,  3, 0 },
  48         [LAYER_RIVERS]   = { "Rivers",   "Overlays/" "Rivers/"   "Short/" "%s_Rivers_Short.gif",   FALSE, 4, 0 },
  49         [LAYER_HIGHWAYS] = { "Highways", "Overlays/" "Highways/" "Short/" "%s_Highways_Short.gif", TRUE,  5, 0 },
  50         [LAYER_CITY]     = { "Cities",   "Overlays/" "Cities/"   "Short/" "%s_City_Short.gif",     TRUE,  6, 0 },
  51 };
  52
  53 static AWeatherGui *gui = NULL;
  54
  55 /**
  56  * Load an image into an OpenGL texture
  57  * \param  filename  Path to the image file
  58  * \return The OpenGL identifier for the texture
  59  */
  60 void load_texture(gchar *filename, gpointer _layer)
  61 {
  62         layer_t *layer = _layer;
  63         aweather_gui_gl_begin(gui);
  64
  65         /* Load image */
  66         GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(filename, NULL);
  67         if (!pixbuf)
  68                 g_warning("Failed to load texture: %s", filename);
  69         guchar    *pixels = gdk_pixbuf_get_pixels(pixbuf);
  70         int        width  = gdk_pixbuf_get_width(pixbuf);
  71         int        height = gdk_pixbuf_get_height(pixbuf);
  72         int        format = gdk_pixbuf_get_has_alpha(pixbuf) ? GL_RGBA : GL_RGB;
  73
  74         /* Create Texture */
  75         glGenTextures(1, &layer->tex);
  76         glBindTexture(GL_TEXTURE_2D, layer->tex); // 2d texture (x and y size)
  77
  78         glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
  79         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
  80                         format, GL_UNSIGNED_BYTE, pixels);
  81         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  82         glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  83
  84         char *base = g_path_get_basename(filename);
  85         g_message("loaded image:  w=%-3d  h=%-3d  fmt=%x  px=(%02x,%02x,%02x,%02x)  img=%s",
  86                 width, height, format, pixels[0], pixels[1], pixels[2], pixels[3],
  87                 base);
  88         g_free(base);
  89
  90         aweather_gui_gl_end(gui);
  91
  92         /* Redraw */
  93         gtk_widget_queue_draw(aweather_gui_get_widget(gui, "drawing"));
  94 }
  95
  96 static void set_site(AWeatherView *view, gchar *site, gpointer user_data)
  97 {
  98         g_message("location changed to %s", site);
  99         for (int i = 0; i < LAYER_COUNT; i++) {
 100                 gchar *base = "http://radar.weather.gov/ridge/";
 101                 gchar *path  = g_strdup_printf(layers[i].fmt, site);
 102                 cache_file(base, path, load_texture, &layers[i]);
 103                 g_free(path);
 104         }
 105 }
 106
 107 static gboolean expose(GtkWidget *da, GdkEventExpose *event, gpointer user_data)
 108 {
 109         g_message("ridge:expose");
 110         glPushMatrix();
 111         glEnable(GL_TEXTURE_2D);
 112         glColor4f(1,1,1,1);
 113
 114         for (int i = 0; i < LAYER_COUNT; i++) {
 115                 if (!layers[i].enabled)
 116                         continue;
 117                 glBindTexture(GL_TEXTURE_2D, layers[i].tex);
 118                 glBegin(GL_POLYGON);
 119                 glTexCoord2f(0.0, 0.0); glVertex3f(250*1000*-1.0, 250*1000* 1.0, layers[i].z);
 120                 glTexCoord2f(0.0, 1.0); glVertex3f(250*1000*-1.0, 250*1000*-1.0, layers[i].z);
 121                 glTexCoord2f(1.0, 1.0); glVertex3f(250*1000* 1.0, 250*1000*-1.0, layers[i].z);
 122                 glTexCoord2f(1.0, 0.0); glVertex3f(250*1000* 1.0, 250*1000* 1.0, layers[i].z);
 123                 glEnd();
 124         }
 125
 126         glPopMatrix();
 127         return FALSE;
 128 }
 129
 130 void toggle_layer(GtkToggleButton *check, gpointer _layer)
 131 {
 132         layer_t *layer = _layer;
 133         layer->enabled = gtk_toggle_button_get_active(check);
 134         gtk_widget_queue_draw(aweather_gui_get_widget(gui, "drawing"));
 135 }
 136
 137 gboolean ridge_init(AWeatherGui *_gui)
 138 {
 139         gui = _gui;
 140         AWeatherView *view    = aweather_gui_get_view(gui);
 141         GtkWidget    *drawing = aweather_gui_get_widget(gui, "drawing");
 142         GtkWidget    *config  = aweather_gui_get_widget(gui, "tabs");
 143
 144         /* Add configuration tab */
 145         GtkWidget *tab  = gtk_label_new("Ridge");
 146         GtkWidget *body = gtk_alignment_new(0.5, 0, 0, 0);
 147         GtkWidget *hbox = gtk_hbox_new(FALSE, 10);
 148         for (int i = 0; i < LAYER_COUNT; i++) {
 149                 GtkWidget *check = gtk_check_button_new_with_label(layers[i].name);
 150                 gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(check), layers[i].enabled);
 151                 gtk_box_pack_start(GTK_BOX(hbox), check, FALSE, TRUE, 0);
 152                 g_signal_connect(check, "toggled", G_CALLBACK(toggle_layer), &layers[i]);
 153         }
 154         gtk_container_add(GTK_CONTAINER(body), hbox);
 155         gtk_notebook_append_page(GTK_NOTEBOOK(config), body, tab);
 156
 157         /* Set up OpenGL Stuff */
 158         g_signal_connect(drawing, "expose-event",     G_CALLBACK(expose),    NULL);
 159         g_signal_connect(view,    "location-changed", G_CALLBACK(set_site),  NULL);
 160
 161         return TRUE;
 162 }