Cfrgtkky

I'm trying to draw two rectangles (using fill and a cycle) where only the north/south corners are rounded. I want the blue rectangle below to have rounded corners only on the top, and I want the red rectangle on the bottom to have rounded corners only on the bottom.

Code:

documentclass{article}

usepackage{tikz}



begin{document}



begin{figure}[h]

centering



begin{tikzpicture}

fill [blue,rounded corners=10, draw]

  (0,0) --

  ++(5,0) --

  ++(0,5) --

  ++(-5,0) --

  cycle

  {};

fill [red,rounded corners=10, draw]

  (0,0) --

  ++(5,0) --

  ++(0,-5) --

  ++(-5,0) --

  cycle

  {};

end{tikzpicture}



end{figure}



end{document}

Output:

Can someone help me with this?

These questions might hint on solutions, but I couldn't get it to work with fill or draw:
Rounded corners on only one side of a TikZ node
Draw a rectangle with rounded ends in TikZ
TikZ rectangular node with different rounded corners

One box and a path picture:

documentclass[tikz,border=5]{standalone}

tikzset{bicolor/.style args={#1 and #2}{

  path picture={

    tikzset{rounded corners=0}

    fill [#1] (path picture bounding box.west)

      rectangle (path picture bounding box.north east);

    fill [#2] (path picture bounding box.west)

      rectangle (path picture bounding box.south east);

}}}

begin{document}

begin{tikzpicture}

path [bicolor={blue and red}, rounded corners=2ex] 

  (0,0) rectangle (2,4);

end{tikzpicture}

end{document}  

Thank you for your suggestions! I liked the method proposed in the answer Torbjørn T. linked to the most, so I'm answering here myself.

Code:

documentclass{article}

usepackage{tikz}



begin{document}



begin{figure}[h]

centering



begin{tikzpicture}

fill [blue,draw]

  (0,0) --

  ++(5,0) {[rounded corners=10] --

  ++(0,5) --

  ++(-5,0)} --

  cycle

  {};

fill [red,draw]

  (0,0) --

  ++(5,0) {[rounded corners=10] --

  ++(0,-5) --

  ++(-5,0)} --

  cycle

  {};

end{tikzpicture}



end{figure}



end{document}

Output:

documentclass{article}



usepackage[most]{tcolorbox}







begin{document}









begin{figure}[h]



centering

begingroup % for `offinterlineskip` 

offinterlineskip

tcbset{arc=0.5cm,auto outer arc}

begin{tcolorbox}[nobeforeafter,after=parnointerlineskip,sharp corners=south,height=4cm,colback=blue,boxrule=0pt,width=4cm]

end{tcolorbox}

begin{tcolorbox}[nobeforeafter,after=parnointerlineskip,sharp corners=north,height=4cm,colback=red,boxrule=0pt,width=4cm]

end{tcolorbox}

endgroup

end{figure}



end{document}

documentclass{article}

usepackage{tikz}



begin{document}



begin{figure}[h]

centering



begin{tikzpicture}

path[clip,rounded corners=10](0,-5) rectangle (5,5);

fill [blue]

  (0,0) --

  ++(5,0) --

  ++(0,5) --

  ++(-5,0) --

  cycle

  {};

fill [red]

  (0,0) --

  ++(5,0) --

  ++(0,-5) --

  ++(-5,0) --

  cycle

  {};

end{tikzpicture}



end{figure}



end{document}

Another solution. Same rectangle is drawn twice, but the second one filled with another color and clipped to just show half of it.

documentclass{article}

usepackage{tikz}



begin{document}



begin{figure}[h]

centering



begin{tikzpicture}

fill [blue,rounded corners=10, draw]

  (0,0) rectangle (5,10);

begin{scope}

clip (0,0) rectangle (5,5);

fill [red,rounded corners=10, draw]

  (0,0) rectangle (5,10);

end{scope}

end{tikzpicture}



end{figure}



end{document}