src/animation.cpp

   1 /*********************************
   2 ** Tsunagari Tile Engine        **
   3 ** animation.cpp                **
   4 ** Copyright 2011-2012 OmegaSDG **
   5 *********************************/
   6
   7 // **********
   8 // Permission is hereby granted, free of charge, to any person obtaining a copy
   9 // of this software and associated documentation files (the "Software"), to
  10 // deal in the Software without restriction, including without limitation the
  11 // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  12 // sell copies of the Software, and to permit persons to whom the Software is
  13 // furnished to do so, subject to the following conditions:
  14 //
  15 // The above copyright notice and this permission notice shall be included in
  16 // all copies or substantial portions of the Software.
  17 //
  18 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  24 // IN THE SOFTWARE.
  25 // **********
  26
  27 #include <cassert>
  28
  29 #include <Gosu/Graphics.hpp>
  30
  31 #include "animation.h"
  32
  33 Animation::Animation()
  34         : cycles(0),
  35           frameShowing(0)
  36 {
  37 }
  38
  39 Animation::Animation(const ImageRef& frame)
  40         : cycles(0),
  41           frameShowing(0)
  42 {
  43         frames.push_back(frame);
  44 }
  45
  46 Animation::Animation(const std::vector<ImageRef>& _frames, time_t frameTime)
  47         : cycles(0),
  48           frameTime(frameTime),
  49           frameShowing(0),
  50           offset(0)
  51 {
  52         ImageVec::const_iterator it;
  53         for (it = _frames.begin(); it != _frames.end(); it++)
  54                 frames.push_back(*it);
  55         if (cycles == 0 && frames.size() > 1)
  56                 cycles = ANIM_INFINITE_CYCLES;
  57         cycleTime = frameTime * frames.size();
  58 }
  59
  60 void Animation::startOver(time_t now, int cycles)
  61 {
  62         assert(cycles >= 0 || cycles == ANIM_INFINITE_CYCLES);
  63
  64         this->cycles = cycles;
  65         offset = now;
  66         frameShowing = 0;
  67 }
  68
  69 bool Animation::needsRedraw(time_t now) const
  70 {
  71         if (cycles) {
  72                 time_t pos = now - offset;
  73                 size_t frame = (pos % cycleTime) / frameTime;
  74                 return frame != frameShowing;
  75         }
  76         return false;
  77 }
  78
  79 Image* Animation::frame(time_t now)
  80 {
  81         if (frames.size() == 0)
  82                 return NULL;
  83         if (cycles == 0)
  84                 return frames[frameShowing].get();
  85
  86         time_t pos = now - offset;
  87         frameShowing = (pos % cycleTime) / frameTime;
  88
  89         if (cycles != ANIM_INFINITE_CYCLES && pos / cycleTime >= cycles) {
  90                 cycles = 0;
  91                 frameShowing = frames.size() - 1; // last frame
  92         }
  93
  94         return frames[frameShowing].get();
  95 }
  96