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simgear/simgear/canvas/elements/CanvasElement.cxx
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// Interface for 2D Canvas element
//
// Copyright (C) 2012 Thomas Geymayer <tomgey@gmail.com>
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
#include "CanvasElement.hxx"
#include <simgear/canvas/Canvas.hxx>
#include <simgear/canvas/CanvasEventListener.hxx>
#include <simgear/canvas/CanvasEventVisitor.hxx>
#include <simgear/canvas/MouseEvent.hxx>
#include <simgear/scene/material/parseBlendFunc.hxx>
#include <osg/Drawable>
#include <osg/Geode>
#include <osg/Scissor>
#include <boost/algorithm/string/predicate.hpp>
#include <boost/foreach.hpp>
#include <boost/lexical_cast.hpp>
#include <boost/make_shared.hpp>
#include <boost/tokenizer.hpp>
#include <cassert>
#include <cstring>
namespace simgear
{
namespace canvas
{
const std::string NAME_TRANSFORM = "tf";
//----------------------------------------------------------------------------
void Element::removeListener()
{
_node->removeChangeListener(this);
}
//----------------------------------------------------------------------------
Element::~Element()
{
removeListener();
BOOST_FOREACH(osg::Group* parent, _transform->getParents())
{
parent->removeChild(_transform);
}
}
//----------------------------------------------------------------------------
ElementWeakPtr Element::getWeakPtr() const
{
return boost::static_pointer_cast<Element>(_self.lock());
}
//----------------------------------------------------------------------------
void Element::update(double dt)
{
if( !_transform->getNodeMask() )
// Don't do anything if element is hidden
return;
if( _transform_dirty )
{
osg::Matrix m;
for( size_t i = 0; i < _transform_types.size(); ++i )
{
// Skip unused indizes...
if( _transform_types[i] == TT_NONE )
continue;
SGPropertyNode* tf_node = _node->getChild("tf", i, true);
// Build up the matrix representation of the current transform node
osg::Matrix tf;
switch( _transform_types[i] )
{
case TT_MATRIX:
tf = osg::Matrix( tf_node->getDoubleValue("m[0]", 1),
tf_node->getDoubleValue("m[1]", 0),
0,
tf_node->getDoubleValue("m[6]", 0),
tf_node->getDoubleValue("m[2]", 0),
tf_node->getDoubleValue("m[3]", 1),
0,
tf_node->getDoubleValue("m[7]", 0),
0,
0,
1,
0,
tf_node->getDoubleValue("m[4]", 0),
tf_node->getDoubleValue("m[5]", 0),
0,
tf_node->getDoubleValue("m[8]", 1) );
break;
case TT_TRANSLATE:
tf.makeTranslate( osg::Vec3f( tf_node->getDoubleValue("t[0]", 0),
tf_node->getDoubleValue("t[1]", 0),
0 ) );
break;
case TT_ROTATE:
tf.makeRotate( tf_node->getDoubleValue("rot", 0), 0, 0, 1 );
break;
case TT_SCALE:
{
float sx = tf_node->getDoubleValue("s[0]", 1);
// sy defaults to sx...
tf.makeScale( sx, tf_node->getDoubleValue("s[1]", sx), 1 );
break;
}
default:
break;
}
m.postMult( tf );
}
_transform->setMatrix(m);
_transform_dirty = false;
}
// Update bounding box on manual update (manual updates pass zero dt)
if( dt == 0 && _drawable )
_drawable->getBound();
if( _attributes_dirty & BLEND_FUNC )
{
parseBlendFunc(
_transform->getOrCreateStateSet(),
_node->getChild("blend-source"),
_node->getChild("blend-destination"),
_node->getChild("blend-source-rgb"),
_node->getChild("blend-destination-rgb"),
_node->getChild("blend-source-alpha"),
_node->getChild("blend-destination-alpha")
);
_attributes_dirty &= ~BLEND_FUNC;
}
}
//----------------------------------------------------------------------------
naRef Element::addEventListener(const nasal::CallContext& ctx)
{
const std::string type_str = ctx.requireArg<std::string>(0);
naRef code = ctx.requireArg<naRef>(1);
SG_LOG
(
SG_NASAL,
SG_INFO,
"addEventListener(" << _node->getPath() << ", " << type_str << ")"
);
Event::Type type = Event::strToType(type_str);
if( type == Event::UNKNOWN )
naRuntimeError( ctx.c,
"addEventListener: Unknown event type %s",
type_str.c_str() );
_listener[ type ].push_back
(
boost::make_shared<EventListener>( code,
_canvas.lock()->getSystemAdapter() )
);
return naNil();
}
//----------------------------------------------------------------------------
void Element::clearEventListener()
{
_listener.clear();
}
//----------------------------------------------------------------------------
bool Element::accept(EventVisitor& visitor)
{
return visitor.apply(*this);
}
//----------------------------------------------------------------------------
bool Element::ascend(EventVisitor& visitor)
{
if( _parent )
return _parent->accept(visitor);
return true;
}
//----------------------------------------------------------------------------
bool Element::traverse(EventVisitor& visitor)
{
return true;
}
//----------------------------------------------------------------------------
bool Element::handleEvent(canvas::EventPtr event)
{
ListenerMap::iterator listeners = _listener.find(event->getType());
if( listeners == _listener.end() )
return false;
BOOST_FOREACH(EventListenerPtr listener, listeners->second)
listener->call(event);
return true;
}
//----------------------------------------------------------------------------
bool Element::hitBound( const osg::Vec2f& pos,
const osg::Vec2f& local_pos ) const
{
const osg::Vec3f pos3(pos, 0);
// Drawables have a bounding box...
if( _drawable )
return _drawable->getBound().contains(osg::Vec3f(local_pos, 0));
// ... for other elements, i.e. groups only a bounding sphere is available
else
return _transform->getBound().contains(osg::Vec3f(pos, 0));
}
//----------------------------------------------------------------------------
bool Element::isVisible() const
{
return _transform->getNodeMask() != 0;
}
//----------------------------------------------------------------------------
osg::ref_ptr<osg::MatrixTransform> Element::getMatrixTransform()
{
return _transform;
}
osg::ref_ptr<osg::MatrixTransform const> Element::getMatrixTransform() const
{
return _transform;
}
//----------------------------------------------------------------------------
void Element::childAdded(SGPropertyNode* parent, SGPropertyNode* child)
{
if( parent == _node
&& child->getNameString() == NAME_TRANSFORM )
{
if( child->getIndex() >= static_cast<int>(_transform_types.size()) )
_transform_types.resize( child->getIndex() + 1 );
_transform_types[ child->getIndex() ] = TT_NONE;
_transform_dirty = true;
return;
}
else if( parent->getParent() == _node
&& parent->getNameString() == NAME_TRANSFORM )
{
assert(parent->getIndex() < static_cast<int>(_transform_types.size()));
const std::string& name = child->getNameString();
TransformType& type = _transform_types[parent->getIndex()];
if( name == "m" )
type = TT_MATRIX;
else if( name == "t" )
type = TT_TRANSLATE;
else if( name == "rot" )
type = TT_ROTATE;
else if( name == "s" )
type = TT_SCALE;
_transform_dirty = true;
return;
}
childAdded(child);
}
//----------------------------------------------------------------------------
void Element::childRemoved(SGPropertyNode* parent, SGPropertyNode* child)
{
if( parent == _node && child->getNameString() == NAME_TRANSFORM )
{
if( child->getIndex() >= static_cast<int>(_transform_types.size()) )
{
SG_LOG
(
SG_GENERAL,
SG_WARN,
"Element::childRemoved: unknown transform: " << child->getPath()
);
return;
}
_transform_types[ child->getIndex() ] = TT_NONE;
while( !_transform_types.empty() && _transform_types.back() == TT_NONE )
_transform_types.pop_back();
_transform_dirty = true;
return;
}
childRemoved(child);
}
//----------------------------------------------------------------------------
void Element::valueChanged(SGPropertyNode* child)
{
SGPropertyNode *parent = child->getParent();
if( parent == _node )
{
const std::string& name = child->getNameString();
if( setStyle(child) )
return;
else if( name == "update" )
return update(0);
else if( name == "visible" )
// TODO check if we need another nodemask
return _transform->setNodeMask( child->getBoolValue() ? 0xffffffff : 0 );
else if( boost::starts_with(name, "blend-") )
return (void)(_attributes_dirty |= BLEND_FUNC);
}
else if( parent->getParent() == _node
&& parent->getNameString() == NAME_TRANSFORM )
{
_transform_dirty = true;
return;
}
childChanged(child);
}
//----------------------------------------------------------------------------
bool Element::setStyle(const SGPropertyNode* child)
{
StyleSetters::const_iterator setter =
_style_setters.find(child->getNameString());
if( setter == _style_setters.end() )
return false;
const StyleSetter* style_setter = &setter->second.setter;
while( style_setter )
{
if( style_setter->func(*this, child) )
return true;
style_setter = style_setter->next;
}
return false;
}
//----------------------------------------------------------------------------
void Element::setClip(const std::string& clip)
{
if( clip.empty() || clip == "auto" )
{
getOrCreateStateSet()->removeAttribute(osg::StateAttribute::SCISSOR);
return;
}
// TODO generalize CSS property parsing
const std::string RECT("rect(");
if( !boost::ends_with(clip, ")")
|| !boost::starts_with(clip, RECT) )
{
SG_LOG(SG_GENERAL, SG_WARN, "Canvas: invalid clip: " << clip);
return;
}
typedef boost::tokenizer<boost::char_separator<char> > tokenizer;
const boost::char_separator<char> del(", \t\npx");
tokenizer tokens(clip.begin() + RECT.size(), clip.end() - 1, del);
int comp = 0;
int values[4];
for( tokenizer::const_iterator tok = tokens.begin();
tok != tokens.end() && comp < 4;
++tok, ++comp )
{
values[comp] = boost::lexical_cast<int>(*tok);
}
if( comp < 4 )
{
SG_LOG(SG_GENERAL, SG_WARN, "Canvas: invalid clip: " << clip);
return;
}
float scale_x = 1,
scale_y = 1;
CanvasPtr canvas = _canvas.lock();
if( canvas )
{
// The scissor rectangle isn't affected by any transformation, so we need
// to convert to image/canvas coordinates on our selves.
scale_x = canvas->getSizeX()
/ static_cast<float>(canvas->getViewWidth());
scale_y = canvas->getSizeY()
/ static_cast<float>(canvas->getViewHeight());
}
osg::Scissor* scissor = new osg::Scissor();
// <top>, <right>, <bottom>, <left>
scissor->x() = scale_x * values[3];
scissor->y() = scale_y * values[0];
scissor->width() = scale_x * (values[1] - values[3]);
scissor->height() = scale_y * (values[2] - values[0]);
if( canvas )
// Canvas has y axis upside down
scissor->y() = canvas->getSizeY() - scissor->y() - scissor->height();
getOrCreateStateSet()->setAttributeAndModes(scissor);
}
//----------------------------------------------------------------------------
void Element::setBoundingBox(const osg::BoundingBox& bb)
{
if( _bounding_box.empty() )
{
SGPropertyNode* bb_node = _node->getChild("bounding-box", 0, true);
_bounding_box.resize(4);
_bounding_box[0] = bb_node->getChild("min-x", 0, true);
_bounding_box[1] = bb_node->getChild("min-y", 0, true);
_bounding_box[2] = bb_node->getChild("max-x", 0, true);
_bounding_box[3] = bb_node->getChild("max-y", 0, true);
}
_bounding_box[0]->setFloatValue(bb._min.x());
_bounding_box[1]->setFloatValue(bb._min.y());
_bounding_box[2]->setFloatValue(bb._max.x());
_bounding_box[3]->setFloatValue(bb._max.y());
}
//----------------------------------------------------------------------------
osg::BoundingBox Element::getTransformedBounds(const osg::Matrix& m) const
{
if( !_drawable )
return osg::BoundingBox();
osg::BoundingBox transformed;
const osg::BoundingBox& bb = _drawable->getBound();
for(int i = 0; i < 4; ++i)
transformed.expandBy( m * bb.corner(i) );
return transformed;
}
//----------------------------------------------------------------------------
Element::StyleSetters Element::_style_setters;
//----------------------------------------------------------------------------
Element::Element( const CanvasWeakPtr& canvas,
const SGPropertyNode_ptr& node,
const Style& parent_style,
Element* parent ):
PropertyBasedElement(node),
_canvas( canvas ),
_parent( parent ),
_attributes_dirty( 0 ),
_transform_dirty( false ),
_transform( new osg::MatrixTransform ),
_style( parent_style ),
_drawable( 0 )
{
SG_LOG
(
SG_GL,
SG_DEBUG,
"New canvas element " << node->getPath()
);
if( !isInit<Element>() )
{
addStyle("clip", "", &Element::setClip);
}
}
//----------------------------------------------------------------------------
void Element::setDrawable( osg::Drawable* drawable )
{
_drawable = drawable;
assert( _drawable );
osg::ref_ptr<osg::Geode> geode = new osg::Geode;
geode->addDrawable(_drawable);
_transform->addChild(geode);
}
//----------------------------------------------------------------------------
osg::StateSet* Element::getOrCreateStateSet()
{
return _drawable ? _drawable->getOrCreateStateSet()
: _transform->getOrCreateStateSet();
}
//----------------------------------------------------------------------------
void Element::setupStyle()
{
BOOST_FOREACH( Style::value_type style, _style )
setStyle(style.second);
}
} // namespace canvas
} // namespace simgear
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