Animating sprites in sfml from a sprite sheet

Question

I am trying to animate a sprite in sfml. At the moment I am able to move the sprite and change it\'s image when moving in a different direction, but I want to animate it while i

Answer 1

You need to keep track of the frames in the animation (list of sf::IntRects). And have some sort of delay inbetween. On update, simply move through the frames and apply the rectangle.

struct Frame {
   sf::IntRect rect;
   double duration; // in seconds
};

class Animation {
   std::vector<Frame> frames;
   double totalLength;
   double totalProgress;
   sf::Sprite *target;
   public:
     Animation(sf::Sprite& target) { 
       this->target = &target;
       totalProgress = 0.0;
     }

     void addFrame(Frame&& frame) {
       frames.push_back(std::move(frame)); 
       totalLength += frame.duration; 
     }

     void update(double elapsed) {
        totalProgress += elapsed;
        double progress = totalProgress;
        for(auto frame : frames) {
           progress -= (*frame).duration;  

          if (progress <= 0.0 || &(*frame) == &frames.back())
          {
               target->setTextureRect((*frame).rect);  
               break; // we found our frame
          }
     }
};

You can use like so:

sf::Sprite myCharacter;
// Load the image...
Animation animation(myCharacter);
animation.addFrame({sf::IntRect(x,y,w,h), 0.1});
// do this for as many frames as you need

// In your main loop:
animation.update(elapsed);
window.draw(myCharacter);