Régionement du plan et systèmes linèaires
📅 December 06, 2024 | 👁️ Views: 284
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Pour coloriser la région, On considère 4 points cachés, un point d'intersection de la droite avec un axe vertical à guache x=-3 par exemple, un autre point d'intersection avec l'axe vertical x=5, ces deux points appartiennent à la droite, et deux autres points que vous décider vous mêmes pour completer le quadrilataire à remplir par la couleur
\documentclass{standalone}
\standaloneconfig{margin=2mm}
\usepackage{tikz}
\usetikzlibrary{intersections}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\definecolor{RoyalBlue}{HTML}{4169E1} % Royal Blue
\begin{document}
\begin{tikzpicture}[scale=1.5]
\begin{axis}[
xmin=-12, xmax=8,
ymin=-8, ymax=14,
axis lines=middle,
xlabel={$x$},
ylabel={$y$},
xtick={-4,-2,...,4},
ytick={-4,-2,...,4},
grid=both,
]
\addplot[domain=-7.5:5.5, smooth, red, name path=curveD] {(4 - x)/2} node[below right] {$(D)$};
\addplot[domain=-5.5:3.5, smooth, blue, name path=curveDelta] {3*x+2} node[below right] {$(\Delta)$};
% intersection with x=-6
\path[name path=laxis] (axis cs:-6,-5) -- (axis cs:-6,5); % axis x=-6
\path[name intersections={of=curveD and laxis,by={A}}];
% intersection with x=5
\path[name path=raxis] (axis cs:5,-5) -- (axis cs:5,5); % axis x=5
\path[name intersections={of=curveD and raxis,by={B}}];
\coordinate (C) at (axis cs:-8,-4);
\coordinate (D) at (axis cs:5,-7);
% Fill the region
\fill[red, opacity=0.6] (A) -- (B) -- (D) -- (C) -- cycle;
%% Plot the points to help defining the region to fill
%\fill (A) circle (1pt) node[left] {A};
%\fill (B) circle (1pt) node[right] {B};
%\fill (C) circle (1pt) node[below left] {C};
%\fill (D) circle (1pt) node[below left] {D};
% intersection with x=-3
\path[name path=llaxis] (axis cs:-3,-7) -- (axis cs:-3,7); % axis x=-3
\path[name intersections={of=curveDelta and llaxis,by={AA}}];
% intersection with x=3
\path[name path=rraxis] (axis cs:3,-7) -- (axis cs:3,12); % axis x=3
\path[name intersections={of=curveDelta and rraxis,by={BB}}];
\coordinate (CC) at (axis cs:-8,-2);
\coordinate (DD) at (axis cs:-4,12);
% Fill the region
\fill[RoyalBlue, opacity=0.6] (AA) -- (BB) -- (DD) -- (CC) -- cycle;
%% Plot the points to help defining the region to fill
%\fill (AA) circle (1pt) node[left] {AA};
%\fill (BB) circle (1pt) node[right] {BB};
%\fill (CC) circle (1pt) node[below left] {CC};
%\fill (DD) circle (1pt) node[below left] {DD};
\end{axis}
\end{tikzpicture}
\end{document}
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The course "Colorer une région du plan Crée par une droite" covers key concepts of latex for figures. Designed to help students master the curriculum.
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