I want to set scale for a sprite by height of original image. And then the width of that sprite will follow by original ratio of that image. How can i do that. Thank for all your help.
CCSprite has a member function
virtual void setScale(float scale)
Reference:setScale
Just create a sprite, and call this function.
CCSprite* bg = CCSprite::create("background.png");
this->addChild(bg,0);
bg->setScale(2.0);
bg sprite will be twice bigger than the origin one.