C++ Selection::bounds方法代码示例

static void
sp_object_layout_any_value_changed(GtkAdjustment *adj, SPWidget *spw)
{
    if (g_object_get_data(G_OBJECT(spw), "update")) {
        return;
    }

    UnitTracker *tracker = reinterpret_cast<UnitTracker*>(g_object_get_data(G_OBJECT(spw), "tracker"));
    if ( !tracker || tracker->isUpdating() ) {
        /*
         * When only units are being changed, don't treat changes
         * to adjuster values as object changes.
         */
        return;
    }
    g_object_set_data(G_OBJECT(spw), "update", GINT_TO_POINTER(TRUE));

    SPDesktop *desktop = SP_ACTIVE_DESKTOP;
    Inkscape::Selection *selection = sp_desktop_selection(desktop);
    SPDocument *document = sp_desktop_document(desktop);

    document->ensureUpToDate ();
    Inkscape::Preferences *prefs = Inkscape::Preferences::get();

    Geom::OptRect bbox_vis = selection->visualBounds();
    Geom::OptRect bbox_geom = selection->geometricBounds();

    int prefs_bbox = prefs->getInt("/tools/bounding_box");
    SPItem::BBoxType bbox_type = (prefs_bbox == 0)?
        SPItem::VISUAL_BBOX : SPItem::GEOMETRIC_BBOX;
    Geom::OptRect bbox_user = selection->bounds(bbox_type);

    if ( !bbox_user ) {
        g_object_set_data(G_OBJECT(spw), "update", GINT_TO_POINTER(FALSE));
        return;
    }

    gdouble x0 = 0;
    gdouble y0 = 0;
    gdouble x1 = 0;
    gdouble y1 = 0;
    gdouble xrel = 0;
    gdouble yrel = 0;
    SPUnit const &unit = *tracker->getActiveUnit();

    GtkAdjustment* a_x = GTK_ADJUSTMENT( g_object_get_data( G_OBJECT(spw), "X" ) );
    GtkAdjustment* a_y = GTK_ADJUSTMENT( g_object_get_data( G_OBJECT(spw), "Y" ) );
    GtkAdjustment* a_w = GTK_ADJUSTMENT( g_object_get_data( G_OBJECT(spw), "width" ) );
    GtkAdjustment* a_h = GTK_ADJUSTMENT( g_object_get_data( G_OBJECT(spw), "height" ) );

    if (unit.base == SP_UNIT_ABSOLUTE || unit.base == SP_UNIT_DEVICE) {
        x0 = sp_units_get_pixels (gtk_adjustment_get_value (a_x), unit);
        y0 = sp_units_get_pixels (gtk_adjustment_get_value (a_y), unit);
        x1 = x0 + sp_units_get_pixels (gtk_adjustment_get_value (a_w), unit);
        xrel = sp_units_get_pixels (gtk_adjustment_get_value (a_w), unit) / bbox_user->dimensions()[Geom::X];
        y1 = y0 + sp_units_get_pixels (gtk_adjustment_get_value (a_h), unit);
        yrel = sp_units_get_pixels (gtk_adjustment_get_value (a_h), unit) / bbox_user->dimensions()[Geom::Y];
    } else {
        double const x0_propn = gtk_adjustment_get_value (a_x) * unit.unittobase;
        x0 = bbox_user->min()[Geom::X] * x0_propn;
        double const y0_propn = gtk_adjustment_get_value (a_y) * unit.unittobase;
        y0 = y0_propn * bbox_user->min()[Geom::Y];
        xrel = gtk_adjustment_get_value (a_w) * unit.unittobase;
        x1 = x0 + xrel * bbox_user->dimensions()[Geom::X];
        yrel = gtk_adjustment_get_value (a_h) * unit.unittobase;
        y1 = y0 + yrel * bbox_user->dimensions()[Geom::Y];
    }

    // Keep proportions if lock is on
    GtkToggleAction *lock = GTK_TOGGLE_ACTION( g_object_get_data(G_OBJECT(spw), "lock") );
    if ( gtk_toggle_action_get_active(lock) ) {
        if (adj == a_h) {
            x1 = x0 + yrel * bbox_user->dimensions()[Geom::X];
        } else if (adj == a_w) {
            y1 = y0 + xrel * bbox_user->dimensions()[Geom::Y];
        }
    }

    // scales and moves, in px
    double mh = fabs(x0 - bbox_user->min()[Geom::X]);
    double sh = fabs(x1 - bbox_user->max()[Geom::X]);
    double mv = fabs(y0 - bbox_user->min()[Geom::Y]);
    double sv = fabs(y1 - bbox_user->max()[Geom::Y]);

    // unless the unit is %, convert the scales and moves to the unit
    if (unit.base == SP_UNIT_ABSOLUTE || unit.base == SP_UNIT_DEVICE) {
        mh = sp_pixels_get_units (mh, unit);
        sh = sp_pixels_get_units (sh, unit);
        mv = sp_pixels_get_units (mv, unit);
        sv = sp_pixels_get_units (sv, unit);
    }

    // do the action only if one of the scales/moves is greater than half the last significant
    // digit in the spinbox (currently spinboxes have 3 fractional digits, so that makes 0.0005). If
    // the value was changed by the user, the difference will be at least that much; otherwise it's
    // just rounding difference between the spinbox value and actual value, so no action is
    // performed
    char const * const actionkey = ( mh > 5e-4 ? "selector:toolbar:move:horizontal" :
                                     sh > 5e-4 ? "selector:toolbar:scale:horizontal" :
                                     mv > 5e-4 ? "selector:toolbar:move:vertical" :
//.........这里部分代码省略.........