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Canvas: Prepare for DOM Level 2 like event model.
[simgear.git] / simgear / canvas / elements / CanvasImage.hxx
1 // An image on the Canvas
2 //
3 // Copyright (C) 2012  Thomas Geymayer <tomgey@gmail.com>
4 //
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.
9 //
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.
14 //
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
18
19 #ifndef CANVAS_IMAGE_HXX_
20 #define CANVAS_IMAGE_HXX_
21
22 #include "CanvasElement.hxx"
23
24 #include <simgear/canvas/canvas_fwd.hxx>
25 #include <simgear/math/Rect.hxx>
26 #include <osg/Texture2D>
27
28 namespace simgear
29 {
30 namespace canvas
31 {
32
33   class Image:
34     public Element
35   {
36     public:
37       /**
38        * @param node    Property node containing settings for this image:
39        *                  rect/[left/right/top/bottom]  Dimensions of source
40        *                                                rect
41        *                  size[0-1]                     Dimensions of rectangle
42        *                  [x,y]                         Position of rectangle
43        */
44       Image( const CanvasWeakPtr& canvas,
45              const SGPropertyNode_ptr& node,
46              const Style& parent_style,
47              Element* parent = 0 );
48       virtual ~Image();
49
50       virtual void update(double dt);
51
52       void setSrcCanvas(CanvasPtr canvas);
53       CanvasWeakPtr getSrcCanvas() const;
54
55       void setImage(osg::Image *img);
56       void setFill(const std::string& fill);
57
58       const Rect<float>& getRegion() const;
59
60     protected:
61
62       enum ImageAttributes
63       {
64         SRC_RECT       = LAST_ATTRIBUTE << 1, // Source image rectangle
65         DEST_SIZE      = SRC_RECT << 1        // Element size
66       };
67
68       virtual void childChanged(SGPropertyNode * child);
69
70       void setupDefaultDimensions();
71       Rect<int> getTextureDimensions() const;
72
73       osg::ref_ptr<osg::Texture2D> _texture;
74       // TODO optionally forward events to canvas
75       CanvasWeakPtr _src_canvas;
76
77       osg::ref_ptr<osg::Geometry>  _geom;
78       osg::ref_ptr<osg::Vec3Array> _vertices;
79       osg::ref_ptr<osg::Vec2Array> _texCoords;
80       osg::ref_ptr<osg::Vec4Array> _colors;
81
82       SGPropertyNode *_node_src_rect;
83       Rect<float>     _src_rect,
84                       _region;
85   };
86
87 } // namespace canvas
88 } // namespace canvas
89
90 #endif /* CANVAS_IMAGE_HXX_ */