root/OpenSceneGraph/trunk/include/osgText/FadeText @ 13041

Revision 13041, 1.7 kB (checked in by robert, 3 years ago)

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1/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
2 *
3 * This library is open source and may be redistributed and/or modified under
4 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
5 * (at your option) any later version.  The full license is in LICENSE file
6 * included with this distribution, and on the openscenegraph.org website.
7 *
8 * This library is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * OpenSceneGraph Public License for more details.
12*/
13
14#ifndef OSGTEXT_FADETEXT
15#define OSGTEXT_FADETEXT 1
16
17#include <osgText/Text>
18
19namespace osgText {
20
21
22class OSGTEXT_EXPORT FadeText : public osgText::Text
23{
24public:
25
26    FadeText();
27    FadeText(const Text& text,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY);
28
29    META_Object(osgText,FadeText)
30
31
32    /** Set the speed that the alpha value changes as the text is occluded or becomes visible.*/
33    void setFadeSpeed(float fadeSpeed) { _fadeSpeed = fadeSpeed; }
34
35    /** Get the speed that the alpha value changes.*/
36    float getFadeSpeed() const { return _fadeSpeed; }
37
38    /** Draw the text.*/
39    virtual void drawImplementation(osg::RenderInfo& renderInfo) const;
40
41protected:
42
43    virtual ~FadeText() {}
44
45    void init();
46
47    struct FadeTextUpdateCallback;
48    friend struct FadeTextUpdateCallback;
49
50    typedef std::map<osg::View*, osg::Vec4 > ViewBlendColourMap;
51
52    ViewBlendColourMap& getViewBlendColourMap() { return _viewBlendColourMap; }
53    const ViewBlendColourMap& getViewBlendColourMap() const { return _viewBlendColourMap; }
54
55    float _fadeSpeed;
56
57    mutable ViewBlendColourMap _viewBlendColourMap;
58};
59
60}
61
62
63#endif
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