`\begin{tikzpicture} La fonction `clip` peut aider : \begin{tikzpicture} \clip (1,0) -- (0,1)--(0,4)--(4,4)--(4,0); \filldraw[blue, rounded corners, even odd rule] (0, 0) rectangle (3, 3) (1, 1) rectangle (2, 2) ; \end{tikzpicture}` peut-être?; \end{tikzpicture}

`\begin{tikzpicture} \filldraw[red!20, rounded corners] (-1, -1) rectangle (4, 4) ; \clip (1,0) -- (0,1)--(0,4)--(4,4)--(4,0); \filldraw[blue, rounded corners, even odd rule] (0, 0) rectangle (3, 3) (1, 1) rectangle (2, 2) ; \end{tikzpicture}` peut-être?

`\begin{tikzpicture} \filldraw[red!20, rounded corners] (-1, -1) rectangle (4, 4) ; \clip (1,0) -- (0,1)--(0,4)--(4,4)--(4,0); \filldraw[blue, rounded corners, even odd rule] (0, 0) rectangle (3, 3) (1, 1) rectangle (2, 2) ; \end{tikzpicture}` peut-être?