Rotating multiple sprites as one ( around same origin )

Question

I have array of sprites forming T shape, and I want to ratate them around the same origin, in my case box2D body origin, like this:

Answer 1

As you can see in your 'right' example in the diagram, the position of the sprites depends on the angle of the body, which you are not accounting for.

b2Vec2 pos = ...; // center of the sprite relative to body (local coords)
float ang = ...;  // angle of the sprite relative to body (probably zero)

//need to rotate image local center by body angle
b2Rot rot( body->GetAngle() );
pos = b2Mul(rot, pos) + body->GetPosition();
ang += -body->GetAngle();

sprite.setRotation( ang * RADTODEG ); // RADTODEG = 57.295779513082320876f
sprite.setPosition( PTM * pos.x,  PTM * -pos.y);

Prior to that, I have also done:

sf::FloatRect rect = sprite.getLocalBounds();
sprite.setOrigin( 0.5 * rect.width, 0.5 * rect.height );