musk/animation.cpp

   1 #include "animation.h"
   2
   3 namespace musk {
   4
   5   using std::string;
   6
   7   Animation::Animation(const string& path, size_t frames, uint32_t durations) :
   8     Image(path),
   9
  10     frames_(frames),
  11     durations_(),
  12     currentFrame_(0),
  13     currentTicks_(0),
  14     width_(0) {
  15
  16     if (frames_ > 1) {
  17       width_ = Image::width() / frames_;
  18     }
  19     else {
  20       frames_ = 1;
  21       width_ = Image::width();
  22     }
  23
  24     clipMask_.w = width_;
  25     durations_.assign(frames_, durations);
  26   }
  27
  28   int Animation::width() const {
  29     return width_;
  30   }
  31
  32   unsigned int Animation::durationForFrame(size_t n) const {
  33     return durations_.at(n);
  34   }
  35
  36   void Animation::reset() {
  37     clipMask_.x = 0;
  38   }
  39
  40   void Animation::step(uint32_t ticks)
  41   {
  42     currentTicks_ += ticks;
  43     if (currentTicks_ < durationForFrame(currentFrame_)) {
  44       return;
  45     }
  46     currentTicks_ -= durationForFrame(currentFrame_);
  47     currentFrame_ = (currentFrame_ + 1) % frames_;
  48
  49     clipMask_.x += width();
  50     if (clipMask_.x >= Image::width()) {
  51       reset();
  52     }
  53   }
  54
  55 } // namespace musk