/** Set the diagram extents field to the union of the extents of the layers.
* @param data The diagram to get the extents for.
*/
static void
data_get_layers_extents_union(DiagramData *data)
{
guint i;
gboolean first = TRUE;
Rectangle new_extents;
for ( i = 0 ; i<data->layers->len; i++) {
Layer *layer = g_ptr_array_index(data->layers, i);
if (!layer->visible) continue;
layer_update_extents(layer);
if (first) {
new_extents = layer->extents;
first = rectangle_equals(&new_extents,&invalid_extents);
} else {
if (!rectangle_equals(&layer->extents,&invalid_extents)) {
rectangle_union(&new_extents, &layer->extents);
}
}
}
data->extents = new_extents;
}
/** Adjust the extents field of a diagram.
* @param data The diagram to adjust.
* @return TRUE if the extents changed.
*/
static gboolean
data_compute_extents(DiagramData *data)
{
Rectangle old_extents = data->extents;
if (!data_has_visible_layers(data)) {
if (data->layers->len > 0) {
Layer *layer = g_ptr_array_index(data->layers, 0);
layer_update_extents(layer);
data->extents = layer->extents;
} else {
data->extents = invalid_extents;
}
} else {
data_get_layers_extents_union(data);
}
if (rectangle_equals(&data->extents,&invalid_extents)) {
data->extents.left = 0.0;
data->extents.right = 10.0;
data->extents.top = 0.0;
data->extents.bottom = 10.0;
}
return (!rectangle_equals(&data->extents,&old_extents));
}
/*!
* \brief Recalculation of the bounding box containing all objects in the layer
* \memberof _Layer
*/
int
layer_update_extents(Layer *layer)
{
GList *l;
DiaObject *obj;
Rectangle new_extents;
l = layer->objects;
if (l!=NULL) {
obj = (DiaObject *) l->data;
new_extents = obj->bounding_box;
l = g_list_next(l);
while(l!=NULL) {
const Rectangle *bbox;
obj = (DiaObject *) l->data;
/* don't consider empty (or broken) objects in the overall extents */
bbox = &obj->bounding_box;
if (bbox->right > bbox->left && bbox->bottom > bbox->top)
rectangle_union(&new_extents, &obj->bounding_box);
l = g_list_next(l);
}
} else {
new_extents = invalid_extents;
}
if (rectangle_equals(&new_extents,&layer->extents)) return FALSE;
layer->extents = new_extents;
return TRUE;
}
