tkz-euclide, FillAngle

Question

tkzFillAngle makes a small mistake when filling an angle and I don't know why.

Here is my minimum working example:

\documentclass{article}
\usepackage{tkz-euclide}
\usetkzobj{all}
\begin{document}
\begin{figure*}
    \centering
    \begin{tikzpicture}[scale=5]    
        \node at (0:1) (point) {};
        \node at (30:1) (otherpoint) {};
        \node at (0:0) (O) {};
        \tkzFillAngle[fill=orange, size=0.3, opacity=0.4](point,O,otherpoint)
        % tkz code no ;
        \draw [dashed] (O.center)--(point);
        \draw (O.center)--(otherpoint);
    \end{tikzpicture}
    \caption{asdf}
\end{figure*}   
\end{document}

Here is what I get. Note how the filling doesn't go all the way to the corner of the angle. Any idea what I'm doing wrong?

Answer 1

You need to use \coordinate instead of \node.

See here: TikZ: difference between \node and \coordinate?.

\documentclass{article}
\usepackage{tkz-euclide}
\usetkzobj{all}
\begin{document}
\begin{figure*}
    \centering
    \begin{tikzpicture}[scale=5]    
        \coordinate (point) at (0:1);
        \coordinate (otherpoint) at (30:1);
        \coordinate (O) at (0:0);
        \tkzFillAngle[fill=orange, size=0.3, 
        opacity=0.4](point,O,otherpoint)% no ; here
        \draw [dashed] (O)--(point);
        \draw (O)--(otherpoint);
    \end{tikzpicture}
    \caption{asdf}
\end{figure*}   
\end{document}

Answer 2

It is possible to define the points as just done @CarlaTex but it is also possible to define them with the macro tkzDefPoint[< options >](x,y){name}

The tkzFillAngle macro is not documented in the manual, but is quoted. The manual contains the \tkzMarkAngle macro which is used in the same way without being documented either.

The manual documents two macros that allow drawing angular sectors \tkzDrawSector and tkzFillSector which allows to plot angular sectors. In order to understand the difference between these two macros, I drew the angular sector with each one without drawing the sides.

\tkzDrawSector draws the contour of the corner:

\tkzFillSector colors it without drawing its contour:

It is of course possible to draw and colour the angular sector at the same time. In the example you gave, as the magnification is of factor 5, I put a radius 5 times smaller (2mm)

tkz-euclide Macros don't need semicolons.

\documentclass{article}
\usepackage{tkz-euclide}
\usetkzobj{all}
\begin{document}
\begin{figure*}
    \centering
    \begin{tikzpicture}[scale=5]    
        \tkzDefPoint(0:1){point}
        \tkzDefPoint(30:1){otherpoint}
        \tkzDefPoint(0:0){O}    
%       \tkzFillAngle[fill=orange, size=0.3, opacity=0.4](point,O,otherpoint);
%       \tkzMarkAngle[fill=orange, size=0.3, opacity=0.4](point,O,otherpoint);
%       \tkzFillSector[R with nodes,fill=orange, opacity=0.4](O,2mm)(point,otherpoint)
        \tkzDrawSector[R with nodes,fill=orange, opacity=0.4](O,2mm)(point,otherpoint)
        \draw [dashed] (O.center)--(point.center);
        \draw (O.center)--(otherpoint.center);
        \tkzDrawPoints(O,point,otherpoint)
    \end{tikzpicture}
    \caption{asdf}
\end{figure*}   
\end{document}

Output with \tkzDrawSector:

Output with \tkzFillSector:

Translated with www.DeepL.com/Translator

Answer 3

With only tkz-euclide

\documentclass{article}
\usepackage{tkz-euclide}
\usetkzobj{all}
\begin{document}
\begin{figure*}
    \centering
    \begin{tikzpicture}[scale=5]    
        % \node at (0:1) (point) {};
        % \node at (30:1) (otherpoint) {};
        % \node at (0:0) (O) {};
        \tkzDefPoint(0:1){point}
        \tkzDefPoint(30:1){otherpoint}
        \tkzDefPoint(0:0){O}
        \tkzFillAngle[fill=orange, size=0.3, opacity=0.4](point,O,otherpoint)
        % tkz code no ;
        \tkzDrawSegment[dashed](O,point)
        \tkzDrawSegment(O,otherpoint)
        % \draw [dashed] (O.center)--(point);
        % \draw (O.center)--(otherpoint);
    \end{tikzpicture}
    \caption{asdf}
\end{figure*}   
\end{document}

With only tikz it's possible to fill an angle. You have beautiful examples with the geometry lessons in the pgfmanual. And now you can use a pic with the recent version.