void diagonalGradient(Surface &sf, const RenderTexture &texture) const;
void crossDiagonalGradient(Surface &sf, const RenderTexture &texture) const;
virtual void drawGradientBackground(Surface &sf,
void diagonalGradient(Surface &sf, const RenderTexture &texture) const;
void crossDiagonalGradient(Surface &sf, const RenderTexture &texture) const;
virtual void drawGradientBackground(Surface &sf,