Sprite In For Loop Not Rotating Around the Center

[maxwell79]

Hi there,

I can't seem to understand why my sprite is not rotating around it's center even after adjusting the origin.
In the code below, the first For loop chooses a particular texture, while the inner For loop draws the sprite multiple times at different positions but with random rotations. The drawn image gives incorrect positions.

Any suggestions would be appreciated.

 for (const auto& resource : list) {
    const auto& id = resource.mId;
    const auto& cells = resource.mCells;

    sf::Sprite sprite(mResources.get(id));
    const float w { sprite.getGlobalBounds().width };
    const float h { sprite.getGlobalBounds().height };
    const float r { h / w };
   
    const float drawWidth =  w > 3 * mLiAlpha ?
      2.0f * mLiAlpha : w;
   
    const float drawHeight = h > 3 * mLi ?
      r * drawWidth : h;
   
    float widthScale  { drawWidth / w };
    float heightScale { drawWidth / h };
     
      sprite.setScale(widthScale, heightScale);
      for (auto& i : cells) {
          sprite.setOrigin
            (sprite.getGlobalBounds().width  / 2.0f,
             sprite.getGlobalBounds().height / 2.0f);
          sprite.setRotation(rand(eng));
          sprite.setOrigin(0,0);
       
          sprite.setPosition(
                           mCellCentres[i].mXc -
                           sprite.getGlobalBounds().width / 2.0f,
                           mCellCentres[i].mYc -
                           sprite.getGlobalBounds().height / 2.0f);
          texture->draw(sprite);
     }
  }
  texture->display();
  return std::unique_ptr<sf::RenderTexture>(texture);
 

[eXpl0it3r]

Try again with using the [code=cpp][/code] tags and a compilable and minimal example.

Also this code of yours does?

sprite.setOrigin(sprite.getGlobalBounds().width  / 2.0f, sprite.getGlobalBounds().height / 2.0f);
sprite.setOrigin(0,0);

[Laurent]

The transformations are stored separately in sf::Sprite (or rather its base class sf::Transformable), and applied in a fixed order when it is drawn. So calling setOrigin + setRotation + setOrigin has no effect, in the end only the last set origin will be used.

Use a sf::Transform if you want to be able to combine transformations in a custom way. And read the documentation and tutorials carefully, this kind of details is usually well explained