QuickLaTeX: tikZ graphics

QuickLaTeX is free online service which allows LaTeX usage on the web pages.

QuickLaTeX supports tikZ graphics since version 3.7.1.

User can insert tikZ code snippets directly on the page (in WordPress editor) between \begin{tikzpicture} ... \end{tikzpicture} commands. QuickLaTeX will render it into image and place on the page.

By default, tikz is not included into QuickLaTeX preamble, so user has to include tikz package in the local preamble manually using [+preamble] ... [/preamble] shortcodes.

Let’s check example of parabola plot created by Till Tantau. Source code is placed directly on the page (you can copy-paste this code in WordPress post):

\begin{tikzpicture}[scale=2]

% Include tikz into local preamble
[+preamble]
     \usepackage{tikz}
[/preamble]

  \shade[top color=blue,bottom color=gray!50] 
      (0,0) parabola (1.5,2.25) |- (0,0);
  \draw (1.05cm,2pt) node[above] 
      {$\displaystyle\int_0^{3/2} \!\!x^2\mathrm{d}x$};

  \draw[style=help lines] (0,0) grid (3.9,3.9)
       [step=0.25cm]      (1,2) grid +(1,1);

  \draw[->] (-0.2,0) -- (4,0) node[right] {$x$};
  \draw[->] (0,-0.2) -- (0,4) node[above] {$f(x)$};

  \foreach \x/\xtext in {1/1, 1.5/1\frac{1}{2}, 2/2, 3/3}
    \draw[shift={(\x,0)}] (0pt,2pt) -- (0pt,-2pt) node[below] {$\xtext$};

  \foreach \y/\ytext in {1/1, 2/2, 2.25/2\frac{1}{4}, 3/3}
    \draw[shift={(0,\y)}] (2pt,0pt) -- (-2pt,0pt) node[left] {$\ytext$};

  \draw (-.5,.25) parabola bend (0,0) (2,4) node[below right] {$x^2$};
\end{tikzpicture}

QuickLaTeX will render it on the page as:

Rendered by QuickLaTeX.com

A little more elaborate example is Rotated triangle by Martin Scharrer:

\begin{tikzpicture}
[+preamble]
     \usepackage[usenames,dvipsnames,pdftex]{xcolor}
     \usepackage{tikz,ifthen}
[/preamble]
    \coordinate (A) at (0,0);
    \coordinate (B) at (-60:12cm);
    \coordinate (C) at (240:12cm);
    \foreach \density in {20,30,...,160}{%
        \draw[fill=MidnightBlue!\density] (A)--(B)--(C)--cycle;
        \path
             (A) coordinate (X)
          -- (B) coordinate[pos=.15](A)
          -- (C) coordinate[pos=.15](B)
          -- (X) coordinate[pos=.15](C);
    }
\end{tikzpicture}

Rendered by QuickLaTeX.com