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Added animation template classes and made particle system use them.
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loonycyborg
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Sep 24, 2008
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,24 @@ | ||
| /*************************************************************************** | ||
| * Copyright (C) 2008 by Sergey Popov <[email protected]> * | ||
| * * | ||
| * This file is part of Silver Tree. * | ||
| * * | ||
| * Silver Tree is free software; you can redistribute it and/or modify * | ||
| * it under the terms of the GNU General Public License as published by * | ||
| * the Free Software Foundation; either version 3 of the License, or * | ||
| * (at your option) any later version. * | ||
| * * | ||
| * Silver Tree 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 General Public License for more details. * | ||
| * * | ||
| * You should have received a copy of the GNU General Public License * | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/> * | ||
| ***************************************************************************/ | ||
|
|
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| #include "animation.hpp" | ||
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| namespace graphics { | ||
| boost::scoped_ptr<time_source> time_source::time_source_; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,101 @@ | ||
| /*************************************************************************** | ||
| * Copyright (C) 2008 by Sergey Popov <[email protected]> * | ||
| * * | ||
| * This file is part of Silver Tree. * | ||
| * * | ||
| * Silver Tree is free software; you can redistribute it and/or modify * | ||
| * it under the terms of the GNU General Public License as published by * | ||
| * the Free Software Foundation; either version 3 of the License, or * | ||
| * (at your option) any later version. * | ||
| * * | ||
| * Silver Tree 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 General Public License for more details. * | ||
| * * | ||
| * You should have received a copy of the GNU General Public License * | ||
| * along with this program. If not, see <http://www.gnu.org/licenses/> * | ||
| ***************************************************************************/ | ||
|
|
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| #ifndef ANIMATION_HPP_INCLUDED | ||
| #define ANIMATION_HPP_INCLUDED | ||
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| #include <boost/scoped_ptr.hpp> | ||
| #include <boost/utility.hpp> | ||
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| #include <SDL.h> | ||
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| namespace graphics { | ||
|
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| class time_source : boost::noncopyable | ||
| { | ||
| Uint32 ticks_; | ||
|
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| time_source() : ticks_(SDL_GetTicks()) {} | ||
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| static boost::scoped_ptr<time_source> time_source_; | ||
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| public: | ||
| void advance_time() { ticks_ = SDL_GetTicks(); } | ||
| Uint32 time() const { return ticks_; } | ||
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| static time_source& instance() | ||
| { | ||
| if(!time_source_) | ||
| time_source_.reset(new time_source); | ||
| return *time_source_; | ||
| } | ||
| }; | ||
|
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| template <class ValueType> class animation | ||
| { | ||
| Uint32 start_; | ||
| float duration_; | ||
|
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| float time_offset() const { return static_cast<float>(time_source::instance().time() - start_)/1000.0; } | ||
| public: | ||
| animation() : start_(time_source::instance().time()), duration_(0) {} | ||
| virtual ~animation() {} | ||
| virtual ValueType operator()(float time) const = 0; | ||
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| ValueType play() const { return (*this)(time_offset()); } | ||
| void set_duration(float duration) { duration_ = duration; } | ||
| bool finished() const { return time_offset() > duration_; } | ||
| }; | ||
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| template <class ValueType, class Function> class function_animation : public animation<ValueType> | ||
| { | ||
| Function function_; | ||
| public: | ||
| function_animation() : function_() {} | ||
| function_animation(Function function) : function_(function) {} | ||
| ValueType operator()(float time) const { return function_(time); } | ||
| }; | ||
|
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| template <class ValueType> class linear_function | ||
| { | ||
| ValueType a_, b_; | ||
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| public: | ||
| linear_function(ValueType a, ValueType b) : a_(a), b_(b) {} | ||
| ValueType operator()(float x) const { return a_ * x + b_; } | ||
| }; | ||
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| template <class ValueType, class Function> function_animation<ValueType, Function> make_animation(Function function) | ||
| { | ||
| return function_animation<ValueType, Function>(function); | ||
| } | ||
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| template <class ValueType> class quadratic_function | ||
| { | ||
| ValueType a_, b_, c_; | ||
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| public: | ||
| quadratic_function() : a_(), b_(), c_() {} | ||
| quadratic_function(ValueType a, ValueType b, ValueType c) : a_(a), b_(b), c_(c) {} | ||
| ValueType operator()(float x) const { return a_ * (x * x) + b_ * x + c_; } | ||
| }; | ||
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| } | ||
|
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| #endif |
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