/**
* @file
* Group belonging to an SVG drawing element.
*//*
* Authors:
* Krzysztof Kosiński <tweenk.pl@gmail.com>
*
* Copyright (C) 2011 Authors
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include "display/drawing.h"
#include "display/drawing-context.h"
#include "display/drawing-item.h"
#include "display/drawing-group.h"
#include "style.h"
#include "display/cairo-utils.h"
namespace Inkscape {
DrawingGroup::DrawingGroup(Drawing &drawing)
: DrawingItem(drawing)
, _child_transform(NULL)
{}
DrawingGroup::~DrawingGroup()
{
delete _child_transform; // delete NULL; is safe
}
/**
* Set whether the group returns children from pick calls.
* Previously this feature was called "transparent groups".
*/
void
DrawingGroup::setPickChildren(bool p)
{
_pick_children = p;
}
/**
* Set additional transform for the group.
* This is applied after the normal transform and mainly useful for
* markers, clipping paths, etc.
*/
void
DrawingGroup::setChildTransform(Geom::Affine const &new_trans)
{
Geom::Affine current;
if (_child_transform) {
current = *_child_transform;
}
if (!Geom::are_near(current, new_trans, 1e-18)) {
// mark the area where the object was for redraw.
_markForRendering();
if (new_trans.isIdentity()) {
delete _child_transform; // delete NULL; is safe
_child_transform = NULL;
} else {
_child_transform = new Geom::Affine(new_trans);
}
_markForUpdate(STATE_ALL, true);
}
}
unsigned
DrawingGroup::_updateItem(Geom::IntRect const &area, UpdateContext const &ctx, unsigned flags, unsigned reset)
{
unsigned beststate = STATE_ALL;
bool outline = _drawing.outline();
UpdateContext child_ctx(ctx);
if (_child_transform) {
child_ctx.ctm = *_child_transform * ctx.ctm;
}
for (ChildrenList::iterator i = _children.begin(); i != _children.end(); ++i) {
i->update(area, child_ctx, flags, reset);
}
if (beststate & STATE_BBOX) {
_bbox = Geom::OptIntRect();
for (ChildrenList::iterator i = _children.begin(); i != _children.end(); ++i) {
if (i->visible()) {
_bbox.unionWith(outline ? i->geometricBounds() : i->visualBounds());
}
}
}
return beststate;
}
unsigned
DrawingGroup::_renderItem(DrawingContext &dc, Geom::IntRect const &area, unsigned flags, DrawingItem *stop_at)
{
if (stop_at == NULL) {
// normal rendering
for (ChildrenList::iterator i = _children.begin(); i != _children.end(); ++i) {
i->render(dc, area, flags, stop_at);
}
} else {
// background rendering
for (ChildrenList::iterator i = _children.begin(); i != _children.end(); ++i) {
if (&*i == stop_at) return RENDER_OK; // do not render the stop_at item at all
if (i->isAncestorOf(stop_at)) {
// render its ancestors without masks, opacity or filters
i->render(dc, area, flags | RENDER_FILTER_BACKGROUND, stop_at);
// stop further rendering
return RENDER_OK;
} else {
i->render(dc, area, flags, stop_at);
}
}
}
return RENDER_OK;
}
void
DrawingGroup::_clipItem(DrawingContext &dc, Geom::IntRect const &area)
{
for (ChildrenList::iterator i = _children.begin(); i != _children.end(); ++i) {
i->clip(dc, area);
}
}
DrawingItem *
DrawingGroup::_pickItem(Geom::Point const &p, double delta, unsigned flags)
{
for (ChildrenList::iterator i = _children.begin(); i != _children.end(); ++i) {
DrawingItem *picked = i->pick(p, delta, flags);
if (picked) {
return _pick_children ? picked : this;
}
}
return NULL;
}
bool
DrawingGroup::_canClip()
{
return true;
}
bool is_drawing_group(DrawingItem *item)
{
return dynamic_cast<DrawingGroup *>(item) != NULL;
}
} // end namespace Inkscape
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :