src/object/bouncy_coin.cpp

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00001 //  SuperTux
00002 //  Copyright (C) 2006 Matthias Braun <matze@braunis.de>
00003 //
00004 //  This program is free software: you can redistribute it and/or modify
00005 //  it under the terms of the GNU General Public License as published by
00006 //  the Free Software Foundation, either version 3 of the License, or
00007 //  (at your option) any later version.
00008 //
00009 //  This program is distributed in the hope that it will be useful,
00010 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
00011 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012 //  GNU General Public License for more details.
00013 //
00014 //  You should have received a copy of the GNU General Public License
00015 //  along with this program.  If not, see <http://www.gnu.org/licenses/>.
00016 
00017 #include "object/bouncy_coin.hpp"
00018 
00019 #include "sprite/sprite.hpp"
00020 #include "sprite/sprite_manager.hpp"
00021 
00023 static const float FADE_TIME = .2f;
00025 static const float LIFE_TIME = .5f;
00026 
00027 BouncyCoin::BouncyCoin(const Vector& pos, bool emerge) :
00028   sprite(),
00029   position(pos), 
00030   timer(),
00031   emerge_distance(0)
00032 {
00033   timer.start(LIFE_TIME);
00034   sprite = sprite_manager->create("images/objects/coin/coin.sprite");
00035 
00036   if(emerge) {
00037     emerge_distance = sprite->get_height();
00038   }
00039 }
00040 
00041 BouncyCoin::~BouncyCoin()
00042 {
00043 }
00044 
00045 void
00046 BouncyCoin::update(float elapsed_time)
00047 {
00048   float dist = -200 * elapsed_time;
00049   position.y += dist;
00050   emerge_distance += dist;
00051 
00052   if(timer.check())
00053     remove_me();
00054 }
00055 
00056 void
00057 BouncyCoin::draw(DrawingContext& context)
00058 {
00059   float time_left = timer.get_timeleft();
00060   bool fading = time_left < FADE_TIME;
00061   if(fading) {
00062     float alpha = time_left/FADE_TIME;
00063     context.push_transform();
00064     context.set_alpha(alpha);
00065   }
00066 
00067   int layer;
00068   if(emerge_distance > 0) {
00069     layer = LAYER_OBJECTS - 5;
00070   } else {
00071     layer = LAYER_OBJECTS + 5;
00072   }
00073   sprite->draw(context, position, layer);
00074 
00075   if(fading) {
00076     context.pop_transform();
00077   }
00078 }
00079 
00080 /* EOF */

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