1 // Interface for 2D Canvas element
3 // Copyright (C) 2012 Thomas Geymayer <tomgey@gmail.com>
5 // This library is free software; you can redistribute it and/or
6 // modify it under the terms of the GNU Library General Public
7 // License as published by the Free Software Foundation; either
8 // version 2 of the License, or (at your option) any later version.
10 // This library is distributed in the hope that it will be useful,
11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 // Library General Public License for more details.
15 // You should have received a copy of the GNU Library General Public
16 // License along with this library; if not, write to the Free Software
17 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
19 #include "CanvasElement.hxx"
20 #include <simgear/canvas/CanvasEventVisitor.hxx>
21 #include <simgear/canvas/MouseEvent.hxx>
22 #include <simgear/math/SGMisc.hxx>
23 #include <simgear/misc/strutils.hxx>
24 #include <simgear/scene/material/parseBlendFunc.hxx>
26 #include <osg/Drawable>
28 #include <osg/Scissor>
30 #include <boost/algorithm/string/predicate.hpp>
31 #include <boost/foreach.hpp>
32 #include <boost/make_shared.hpp>
42 const std::string NAME_TRANSFORM = "tf";
45 * glScissor with coordinates relative to different reference frames.
47 class Element::RelativeScissor:
52 ReferenceFrame _coord_reference;
53 osg::Matrix _parent_inverse;
56 _coord_reference(GLOBAL)
59 virtual void apply(osg::State& state) const
61 const osg::Viewport* vp = state.getCurrentViewport();
62 float w2 = 0.5 * vp->width(),
63 h2 = 0.5 * vp->height();
65 osg::Matrix model_view
72 model_view.preMult(state.getProjectionMatrix());
74 if( _coord_reference != GLOBAL )
76 model_view.preMult(state.getModelViewMatrix());
78 if( _coord_reference == PARENT )
79 model_view.preMult(_parent_inverse);
82 const osg::Vec2 scale( model_view(0,0), model_view(1,1)),
83 offset(model_view(3,0), model_view(3,1));
85 // TODO check/warn for rotation?
87 GLint x = SGMiscf::roundToInt(scale.x() * _x + offset.x()),
88 y = SGMiscf::roundToInt(scale.y() * _y + offset.y()),
89 w = SGMiscf::roundToInt(std::fabs(scale.x()) * _width),
90 h = SGMiscf::roundToInt(std::fabs(scale.y()) * _height);
97 glScissor(x, y, w, h);
101 //----------------------------------------------------------------------------
102 Element::OSGUserData::OSGUserData(ElementPtr element):
108 //----------------------------------------------------------------------------
111 if( !_transform.valid() )
114 for(unsigned int i = 0; i < _transform->getNumChildren(); ++i)
117 static_cast<OSGUserData*>(_transform->getChild(i)->getUserData());
120 // Ensure parent is cleared to prevent accessing released memory if an
121 // element somehow survives longer than his parent.
122 ud->element->_parent = 0;
126 //----------------------------------------------------------------------------
127 void Element::setSelf(const PropertyBasedElementPtr& self)
129 PropertyBasedElement::setSelf(self);
131 _transform->setUserData
133 new OSGUserData(boost::static_pointer_cast<Element>(self))
137 //----------------------------------------------------------------------------
138 void Element::onDestroy()
140 if( !_transform.valid() )
143 // The transform node keeps a reference on this element, so ensure it is
145 BOOST_FOREACH(osg::Group* parent, _transform->getParents())
147 parent->removeChild(_transform.get());
151 //----------------------------------------------------------------------------
152 ElementWeakPtr Element::getWeakPtr() const
154 return boost::static_pointer_cast<Element>(_self.lock());
157 //----------------------------------------------------------------------------
158 ElementPtr Element::getParent()
160 return _parent ? _parent->getWeakPtr().lock() : ElementPtr();
163 //----------------------------------------------------------------------------
164 void Element::update(double dt)
166 if( !_transform->getNodeMask() )
167 // Don't do anything if element is hidden
170 // Trigger matrix update
173 if( _attributes_dirty & SCISSOR_COORDS )
175 if( _scissor && _scissor->_coord_reference != GLOBAL )
176 _scissor->_parent_inverse = _transform->getInverseMatrix();
178 _attributes_dirty &= ~SCISSOR_COORDS;
181 // Update bounding box on manual update (manual updates pass zero dt)
182 if( dt == 0 && _drawable )
183 _drawable->getBound();
185 if( _attributes_dirty & BLEND_FUNC )
188 _transform->getOrCreateStateSet(),
189 _node->getChild("blend-source"),
190 _node->getChild("blend-destination"),
191 _node->getChild("blend-source-rgb"),
192 _node->getChild("blend-destination-rgb"),
193 _node->getChild("blend-source-alpha"),
194 _node->getChild("blend-destination-alpha")
196 _attributes_dirty &= ~BLEND_FUNC;
200 //----------------------------------------------------------------------------
201 bool Element::addEventListener( const std::string& type_str,
202 const EventListener& cb )
208 "addEventListener(" << _node->getPath() << ", " << type_str << ")"
211 Event::Type type = Event::strToType(type_str);
212 if( type == Event::UNKNOWN )
216 "addEventListener: Unknown event type " << type_str );
220 _listener[ type ].push_back(cb);
225 //----------------------------------------------------------------------------
226 void Element::clearEventListener()
231 //----------------------------------------------------------------------------
232 bool Element::accept(EventVisitor& visitor)
237 return visitor.apply(*this);
240 //----------------------------------------------------------------------------
241 bool Element::ascend(EventVisitor& visitor)
244 return _parent->accept(visitor);
248 //----------------------------------------------------------------------------
249 bool Element::traverse(EventVisitor& visitor)
254 //----------------------------------------------------------------------------
255 bool Element::handleEvent(canvas::EventPtr event)
257 ListenerMap::iterator listeners = _listener.find(event->getType());
258 if( listeners == _listener.end() )
261 BOOST_FOREACH(EventListener const& listener, listeners->second)
267 //----------------------------------------------------------------------------
268 bool Element::hitBound( const osg::Vec2f& pos,
269 const osg::Vec2f& local_pos ) const
271 const osg::Vec3f pos3(pos, 0);
273 // Drawables have a bounding box...
275 return _drawable->getBound().contains(osg::Vec3f(local_pos, 0));
276 // ... for other elements, i.e. groups only a bounding sphere is available
278 return _transform->getBound().contains(osg::Vec3f(pos, 0));
281 //----------------------------------------------------------------------------
282 bool Element::isVisible() const
284 return _transform.valid() && _transform->getNodeMask() != 0;
287 //----------------------------------------------------------------------------
288 osg::MatrixTransform* Element::getMatrixTransform()
290 return _transform.get();
293 //----------------------------------------------------------------------------
294 osg::MatrixTransform const* Element::getMatrixTransform() const
296 return _transform.get();
299 //----------------------------------------------------------------------------
300 void Element::childAdded(SGPropertyNode* parent, SGPropertyNode* child)
303 && child->getNameString() == NAME_TRANSFORM )
305 if( child->getIndex() >= static_cast<int>(_transform_types.size()) )
306 _transform_types.resize( child->getIndex() + 1 );
308 _transform_types[ child->getIndex() ] = TT_NONE;
309 _attributes_dirty |= TRANSFORM;
312 else if( parent->getParent() == _node
313 && parent->getNameString() == NAME_TRANSFORM )
315 assert(parent->getIndex() < static_cast<int>(_transform_types.size()));
317 const std::string& name = child->getNameString();
319 TransformType& type = _transform_types[parent->getIndex()];
323 else if( name == "t" )
325 else if( name == "rot" )
327 else if( name == "s" )
330 _attributes_dirty |= TRANSFORM;
337 //----------------------------------------------------------------------------
338 void Element::childRemoved(SGPropertyNode* parent, SGPropertyNode* child)
340 if( parent == _node )
342 if( child->getNameString() == NAME_TRANSFORM )
344 if( !_transform.valid() )
347 if( child->getIndex() >= static_cast<int>(_transform_types.size()) )
353 "Element::childRemoved: unknown transform: " << child->getPath()
358 _transform_types[ child->getIndex() ] = TT_NONE;
360 while( !_transform_types.empty() && _transform_types.back() == TT_NONE )
361 _transform_types.pop_back();
363 _attributes_dirty |= TRANSFORM;
366 else if( StyleInfo const* style = getStyleInfo(child->getNameString()) )
368 if( setStyle(getParentStyle(child), style) )
376 //----------------------------------------------------------------------------
377 void Element::valueChanged(SGPropertyNode* child)
379 SGPropertyNode *parent = child->getParent();
380 if( parent == _node )
382 const std::string& name = child->getNameString();
383 if( StyleInfo const* style_info = getStyleInfo(name) )
385 SGPropertyNode const* style = child;
386 if( isStyleEmpty(child) )
389 style = getParentStyle(child);
391 setStyle(style, style_info);
394 else if( name == "update" )
396 else if( name == "visible" )
397 // TODO check if we need another nodemask
398 return _transform->setNodeMask( child->getBoolValue() ? 0xffffffff : 0 );
399 else if( boost::starts_with(name, "blend-") )
400 return (void)(_attributes_dirty |= BLEND_FUNC);
402 else if( parent->getParent() == _node
403 && parent->getNameString() == NAME_TRANSFORM )
405 _attributes_dirty |= TRANSFORM;
412 //----------------------------------------------------------------------------
413 bool Element::setStyle( const SGPropertyNode* child,
414 const StyleInfo* style_info )
416 return canApplyStyle(child) && setStyleImpl(child, style_info);
419 //----------------------------------------------------------------------------
420 void Element::setClip(const std::string& clip)
422 if( clip.empty() || clip == "auto" )
424 getOrCreateStateSet()->removeAttribute(osg::StateAttribute::SCISSOR);
429 // TODO generalize CSS property parsing
430 const std::string RECT("rect(");
431 if( !boost::ends_with(clip, ")")
432 || !boost::starts_with(clip, RECT) )
434 SG_LOG(SG_GENERAL, SG_WARN, "Canvas: invalid clip: " << clip);
438 const std::string sep(", \t\npx");
442 for(size_t pos = RECT.size(); comp < 4; ++comp)
444 pos = clip.find_first_not_of(sep, pos);
445 if( pos == std::string::npos || pos == clip.size() - 1 )
449 values[comp] = strtod(&clip[pos], &end);
450 if( end == &clip[pos] || !end )
453 pos = end - &clip[0];
458 SG_LOG(SG_GENERAL, SG_WARN, "Canvas: invalid clip: " << clip);
462 float width = values[1] - values[3],
463 height = values[2] - values[0];
465 if( width < 0 || height < 0 )
467 SG_LOG(SG_GENERAL, SG_WARN, "Canvas: negative clip size: " << clip);
471 _scissor = new RelativeScissor();
472 // <top>, <right>, <bottom>, <left>
473 _scissor->x() = SGMiscf::roundToInt(values[3]);
474 _scissor->y() = SGMiscf::roundToInt(values[0]);
475 _scissor->width() = SGMiscf::roundToInt(width);
476 _scissor->height() = SGMiscf::roundToInt(height);
478 getOrCreateStateSet()->setAttributeAndModes(_scissor);
480 SGPropertyNode* clip_frame = _node->getChild("clip-frame", 0);
482 valueChanged(clip_frame);
485 //----------------------------------------------------------------------------
486 void Element::setClipFrame(ReferenceFrame rf)
490 _scissor->_coord_reference = rf;
491 _attributes_dirty |= SCISSOR_COORDS;
495 //----------------------------------------------------------------------------
496 void Element::setBoundingBox(const osg::BoundingBox& bb)
498 if( _bounding_box.empty() )
500 SGPropertyNode* bb_node = _node->getChild("bounding-box", 0, true);
501 _bounding_box.resize(4);
502 _bounding_box[0] = bb_node->getChild("min-x", 0, true);
503 _bounding_box[1] = bb_node->getChild("min-y", 0, true);
504 _bounding_box[2] = bb_node->getChild("max-x", 0, true);
505 _bounding_box[3] = bb_node->getChild("max-y", 0, true);
508 _bounding_box[0]->setFloatValue(bb._min.x());
509 _bounding_box[1]->setFloatValue(bb._min.y());
510 _bounding_box[2]->setFloatValue(bb._max.x());
511 _bounding_box[3]->setFloatValue(bb._max.y());
514 //----------------------------------------------------------------------------
515 osg::BoundingBox Element::getTransformedBounds(const osg::Matrix& m) const
518 return osg::BoundingBox();
520 osg::BoundingBox transformed;
521 const osg::BoundingBox& bb = _drawable->getBound();
522 for(int i = 0; i < 4; ++i)
523 transformed.expandBy( bb.corner(i) * m );
528 //----------------------------------------------------------------------------
529 osg::Matrix Element::getMatrix() const
531 if( !(_attributes_dirty & TRANSFORM) )
532 return _transform->getMatrix();
535 for( size_t i = 0; i < _transform_types.size(); ++i )
537 // Skip unused indizes...
538 if( _transform_types[i] == TT_NONE )
541 SGPropertyNode* tf_node = _node->getChild("tf", i, true);
543 // Build up the matrix representation of the current transform node
545 switch( _transform_types[i] )
548 tf = osg::Matrix( tf_node->getDoubleValue("m[0]", 1),
549 tf_node->getDoubleValue("m[1]", 0),
551 tf_node->getDoubleValue("m[6]", 0),
553 tf_node->getDoubleValue("m[2]", 0),
554 tf_node->getDoubleValue("m[3]", 1),
556 tf_node->getDoubleValue("m[7]", 0),
563 tf_node->getDoubleValue("m[4]", 0),
564 tf_node->getDoubleValue("m[5]", 0),
566 tf_node->getDoubleValue("m[8]", 1) );
569 tf.makeTranslate( osg::Vec3f( tf_node->getDoubleValue("t[0]", 0),
570 tf_node->getDoubleValue("t[1]", 0),
574 tf.makeRotate( tf_node->getDoubleValue("rot", 0), 0, 0, 1 );
578 float sx = tf_node->getDoubleValue("s[0]", 1);
579 // sy defaults to sx...
580 tf.makeScale( sx, tf_node->getDoubleValue("s[1]", sx), 1 );
588 _transform->setMatrix(m);
589 _attributes_dirty &= ~TRANSFORM;
590 _attributes_dirty |= SCISSOR_COORDS;
595 //----------------------------------------------------------------------------
596 Element::StyleSetters Element::_style_setters;
598 //----------------------------------------------------------------------------
599 Element::Element( const CanvasWeakPtr& canvas,
600 const SGPropertyNode_ptr& node,
601 const Style& parent_style,
603 PropertyBasedElement(node),
606 _attributes_dirty( 0 ),
607 _transform( new osg::MatrixTransform ),
608 _style( parent_style ),
618 "New canvas element " << node->getPath()
621 // Ensure elements are drawn in order they appear in the element tree
622 _transform->getOrCreateStateSet()
623 ->setRenderBinDetails
627 osg::StateSet::OVERRIDE_RENDERBIN_DETAILS
631 //----------------------------------------------------------------------------
632 void Element::staticInit()
634 if( isInit<Element>() )
637 addStyle("clip", "", &Element::setClip, false);
638 addStyle("clip-frame", "", &Element::setClipFrame, false);
641 //----------------------------------------------------------------------------
642 bool Element::isStyleEmpty(const SGPropertyNode* child) const
645 || simgear::strutils::strip(child->getStringValue()).empty();
648 //----------------------------------------------------------------------------
649 bool Element::canApplyStyle(const SGPropertyNode* child) const
651 if( _node == child->getParent() )
654 // Parent values do not override if element has own value
655 return isStyleEmpty( _node->getChild(child->getName()) );
658 //----------------------------------------------------------------------------
659 bool Element::setStyleImpl( const SGPropertyNode* child,
660 const StyleInfo* style_info )
662 const StyleSetter* style_setter = style_info
663 ? &style_info->setter
664 : getStyleSetter(child->getNameString());
665 while( style_setter )
667 if( style_setter->func(*this, child) )
669 style_setter = style_setter->next;
674 //----------------------------------------------------------------------------
675 const Element::StyleInfo*
676 Element::getStyleInfo(const std::string& name) const
678 StyleSetters::const_iterator setter = _style_setters.find(name);
679 if( setter == _style_setters.end() )
682 return &setter->second;
685 //----------------------------------------------------------------------------
686 const Element::StyleSetter*
687 Element::getStyleSetter(const std::string& name) const
689 const StyleInfo* info = getStyleInfo(name);
690 return info ? &info->setter : 0;
693 //----------------------------------------------------------------------------
694 const SGPropertyNode*
695 Element::getParentStyle(const SGPropertyNode* child) const
697 // Try to get value from parent...
700 Style::const_iterator style =
701 _parent->_style.find(child->getNameString());
702 if( style != _parent->_style.end() )
703 return style->second;
706 // ...or reset to default if none is available
707 return child; // TODO somehow get default value for each style?
710 //----------------------------------------------------------------------------
711 void Element::setDrawable( osg::Drawable* drawable )
713 _drawable = drawable;
716 osg::ref_ptr<osg::Geode> geode = new osg::Geode;
717 geode->addDrawable(_drawable);
718 _transform->addChild(geode);
721 //----------------------------------------------------------------------------
722 osg::StateSet* Element::getOrCreateStateSet()
724 return _drawable ? _drawable->getOrCreateStateSet()
725 : _transform->getOrCreateStateSet();
728 //----------------------------------------------------------------------------
729 void Element::setupStyle()
731 BOOST_FOREACH( Style::value_type style, _style )
732 setStyle(style.second);
735 } // namespace canvas
736 } // namespace simgear