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89 lines
2.9 KiB
89 lines
2.9 KiB
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield |
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* |
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* This library is open source and may be redistributed and/or modified under |
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or |
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* (at your option) any later version. The full license is in LICENSE file |
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* included with this distribution, and on the openscenegraph.org website. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* OpenSceneGraph Public License for more details. |
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*/ |
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//osgParticle - Copyright (C) 2002 Marco Jez |
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#ifndef OSGPARTICLE_RANGE |
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#define OSGPARTICLE_RANGE 1 |
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// include Export simply to disable Visual Studio silly warnings. |
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#include <osgParticle/Export> |
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#include <stdlib.h> |
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#include <osg/Vec2> |
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#include <osg/Vec3> |
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#include <osg/Vec4> |
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namespace osgParticle |
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{ |
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/** |
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A simple struct template useful to store ranges of values as min/max pairs. |
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This struct template helps storing min/max ranges for values of any kind; class <CODE>ValueType</CODE> is |
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the type of values to be stored, and it must support operations <CODE>ValueType + ValueType</CODE>, <CODE>ValueType - ValueType</CODE>, |
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and <CODE>ValueType * float</CODE>, otherwise the <CODE>geValueTyperandom()</CODE> method will not compile. |
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This struct could be extended to customize the random number generator (now it uses only |
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<CODE>std::rand()</CODE>). |
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*/ |
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template<class ValueType> struct range |
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{ |
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/// Lower bound. |
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ValueType minimum; |
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/// Higher bound. |
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ValueType maximum; |
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/// Construct the object by calling default constructors for min and max. |
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range() : minimum(ValueType()), maximum(ValueType()) {} |
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/// Construct and initialize min and max directly. |
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range(const ValueType& mn, const ValueType& mx) : minimum(mn), maximum(mx) {} |
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/// Set min and max. |
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void set(const ValueType& mn, const ValueType& mx) { minimum = mn; maximum = mx; } |
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/// Get a random value between min and max. |
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ValueType get_random() const |
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{ |
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return minimum + (maximum - minimum) * rand() / RAND_MAX; |
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} |
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/// Get a random square root value between min and max. |
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ValueType get_random_sqrtf() const |
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{ |
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return minimum + (maximum - minimum) * sqrtf( static_cast<float>(rand()) / static_cast<float>(RAND_MAX) ); |
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} |
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ValueType mid() const |
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{ |
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return (minimum+maximum)*0.5f; |
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} |
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}; |
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/// Range of floats. |
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typedef range<float> rangef; |
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/// Range of osg::Vec2s. |
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typedef range<osg::Vec2> rangev2; |
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/// Range of osg::Vec3s. |
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typedef range<osg::Vec3> rangev3; |
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/// Range of osg::Vec4s. |
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typedef range<osg::Vec4> rangev4; |
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} |
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#endif
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