void update_infos()
{
//base y position of the text
int base_y = 0;
//height of a line of text with the current font.
int line_height = TTF_FontLineSkip(font);
//buffer to hold the current textto be drawn
char buf[TEXT_BUF_SIZE];
//retrieve navdata one by one
int bat = jakopter_com_read_int(com_in, 0);
//and format it for textual display
snprintf(buf, TEXT_BUF_SIZE, "Battery : %d%%", bat);
buf[TEXT_BUF_SIZE-1] = '\0';
//finally, print it onto a texture using SDL_ttf
graphs[0].tex = video_make_text(buf, &graphs[0].pos.w, &graphs[0].pos.h);
//and set its draw position accordingly
graphs[0].pos.x = 0;
graphs[0].pos.y = base_y;
//go to a new line
base_y += line_height;
int alt = jakopter_com_read_int(com_in, 4);
snprintf(buf, TEXT_BUF_SIZE, "Altitude : %d", alt);
buf[TEXT_BUF_SIZE-1] = '\0';
graphs[1].tex = video_make_text(buf, &graphs[1].pos.w, &graphs[1].pos.h);
graphs[1].pos.x = 0;
graphs[1].pos.y = base_y;
//update pitch, roll, yaw and speed
pitch = jakopter_com_read_float(com_in, 8);
roll = jakopter_com_read_float(com_in, 12);
yaw = jakopter_com_read_float(com_in, 16);
speed = jakopter_com_read_float(com_in, 20);
}
/**
* \brief Create the SDL object associated with a graphical element.
* With SDL, we can't create or destroy texture from a different thread than the rendering one.
* \returns 0 if it's ok, -1 otherwise
*/
int load_element()
{
pthread_mutex_lock(&mutex_graphics_list);
if (icon_registry == NULL) {
pthread_mutex_unlock(&mutex_graphics_list);
return 0;
}
if (load_icon == NULL)
load_icon = icon_registry;
//find the first that isn't loaded yet
while (load_icon->next != NULL && load_icon->string == NULL)
load_icon = load_icon->next;
//nothing found
if (load_icon->string == NULL) {
pthread_mutex_unlock(&mutex_graphics_list);
return 0;
}
if (load_icon->graphic == NULL) {
fprintf(stderr, "[~][display] Graphic element isn't initialized\n");
pthread_mutex_unlock(&mutex_graphics_list);
return -1;
}
load_icon->graphic->tex = NULL;
char* string = load_icon->string;
if (load_icon->type == VIDEO_TEXT) {
graphics_t* graph = load_icon->graphic;
graph->tex = video_make_text(string, &graph->pos.w, &graph->pos.h);
if (graph->pos.x >= current_width-(graph->pos.w)
|| graph->pos.y >= current_height-(graph->pos.h)) {
fprintf(stderr, "[~][display] Position of \"%s\" doesn't fit the bounds of the window\n", string);
pthread_mutex_unlock(&mutex_graphics_list);
display_graphic_remove(load_icon->id);
return -1;
}
}
else if (load_icon->type == VIDEO_ICON) {
graphics_t* graph = load_icon->graphic;
int width = 0;
int height = 0;
SDL_Texture *icon = video_import_png(string, &width, &height);
if (icon == NULL) {
fprintf(stderr, "[~][display] Couldn't import the image %s\n", string);
pthread_mutex_unlock(&mutex_graphics_list);
display_graphic_remove(load_icon->id);
return -1;
}
graph->tex = icon;
if (graph->pos.w == 0 || graph->pos.h == 0) {
graph->pos.w = width;
graph->pos.h = height;
}
if (graph->pos.x >= current_width-(graph->pos.w)
|| graph->pos.y >= current_height-(graph->pos.h)) {
fprintf(stderr, "[~][display] Position of %s doesn't fit the bounds of the window\n", string);
pthread_mutex_unlock(&mutex_graphics_list);
display_graphic_remove(load_icon->id);
return -1;
}
}
//String used for load, indicates now the item is loaded
load_icon->string = NULL;
free(string);
pthread_mutex_unlock(&mutex_graphics_list);
return 0;
}
