Comments:LaTeX-tips font size color box and math

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GeoGebra use JLaTeXMath (a powerful ally) to show mathematical formulas (text and symbols) using LaTeX. The first thing to remember is that LaTeX works in two modes text mode and math mode. Enter text must be in text mode and writing mathematical in math mode. By default when checking the box "LaTeX formula" that enters math mode(font in italic), if we enter text (roman font) must switch to text mode by typing:\text{text text text}or \mbox{text text text}

Fonts

Font size

The size of the fonts can be changed globally with the following commands:

\tiny \scriptsize \footnotesize \small \normalsize
\large \Large \LARGE \huge \Huge

The command \normalsize back font to its original size. If you want to combine different font sizes should add the commands in braces {...}. This is an example of combination of sizes in math mode:

Example: {\scriptsize A}{\footnotesize B}{\small C}{\normalsize D}{\large E}{\Large F}{\LARGE G}{\huge H}{\Huge I} LTX1.PNG

This is an example of combination of sizes in text/math mode using \oldstylenums{ ...} command (only math mode):

Example: \text{{\Huge GeoGebra}, the most powerful, {\small since }}\oldstylenums{ 2001-2012} LTX2.PNG

We can also use the command in text/math mode:\scalebox{h_scale}[v_scale]{...} where {h_scale} is a positive(negative) number (mandatory) and [v_scale] is a positive number (optional), numbers can be sliders.

Example: \scalebox{2}{\text{{\Huge GeoGebra}, the most powerful, {\small since }}\oldstylenums{ 2001-2012}}LTX3.PNG

Font Family

In text mode we have the following families of text, we can use globally or using braces {...}: \rm or {\rm } \sf or {\sf } \tt or {\tt } This is an example:

Example: \text{{\rm GeoGebra}{\sf ,the most powerful}, {\tt since }}\oldstylenums{ 2001-2012} LTX4.PNG

In math mode we have the following families (default mathrm):

\mathcal{ABC} \mathrm{abc} \mathbf{abc} \mathsf{abc} \mathit{abc}
\mathtt{abc} \mathfrak{abc} \mathbb{ABC} \mathscr{ABC}
Example: \mathbb{G}\mathfrak{e}\mathbf{o}\mathsf{G}\mathscr{E}\mathtt{b}\mathit{r}\mathrm{a}
LTX5.PNG

Font Series

For text mode use \bf or {\bf ...} and for math mode use \mathbf{...},

Example: \text{\bf GeoGebra }\mathbf{\sqrt{2012^{2}}}
LTX6.PNG

Font Shapes

For Small Caps in text mode use:\text{{\sc GeoGebra} or \textsc{GeoGebra}

Quotation marks

Straight quotes "..." is a special character for GeoGebra, should never be used directly in LaTeX. For a single quotation marks in text mode use: \text{'Simple'} and for double quotation marks use:\text{''Doble''} For more info see http://www.geogebra.org/forum/viewtopic.php?f=8&t=20512&p=77283&hilit=quotes#p77283

Horizontal space.

For a single spaced in text mode use the space bar for other spaces we have the following commands:\quad \qquad \hspace{...} The command \hspace{...} (and \quad, \qquad also available in math mode) supports the following units of measurement (positive and negative) :

pt point (1 in = 72.27 pt) pc pica (1 pc = 12 pt)
in inch (1 in = 25.4 mm) bp big point (1 in = 72 bp)
cm centimetre (1 cm = 10 mm) mm millimetre
dd didot point (1157 dd = 1238 pt) sp scaled point (65536 sp = 1 pt)

In math mode we have the following commands:

\, a small space \: a medium space \; a large space \! a negative space (moves things back to the left)

Boxes and Color (In both modes)

Text and Math in Color

The colors supported directly by JLaTeXMath can be found in http://en.wikibooks.org/wiki/LaTeX/Colors#The_68_standard_colors_known_to_dvips you can use the command:\textcolor{color}{...}

Example: \text{\textcolor{WildStrawberry}{Geo}\textcolor{blue}{G}\textcolor{red}{ebra}}\,\textcolor{green}{\oldstylenums{4.2}
LTX7.PNG

Adding Colors

If you need to create new color, you can use the command: \definecolor{mycolour}{rgb}{a,b,c} the numbers a, b and c must be between 0 and 1, can be a slider, for example:

Example:
\definecolor{a}{rgb}{0.63,0.39,0.17}
\definecolor{b}{rgb}{0.63,0.17,0.39}
\definecolor{c}{rgb}{0.39,0.63,0.17}
\definecolor{d}{rgb}{0.39,0.17,0.63}
\definecolor{e}{rgb}{0.17,0.63,0.39}
\definecolor{f}{rgb}{0.17,0.39,0.63}
\text{\textcolor{a}C\textcolor{b}O\textcolor{c}L\textcolor{d}O\textcolor{e}U\textcolor{f}R}
LTEX7a.PNG

Frame Boxes

For simple frame boxes (no colors) use :\boxed{2012\text{ is now!} or\fbox{2012\text{ is now!}

Color Boxes

A. For a color box (same color in border and background) use:\colorbox{red}{2012\text{ is now!} B. For a color box (diferent color in border and background) use:\fcolorbox{blue}{red}{2012\text{ is now!}

Rotate Boxes

If you need to rotate a box (or whatever) use:\rotatebox{angle}{...}

Example: \rotatebox{45}{\fcolorbox{blue}{red}{2012\text{ is now!}}
LTX8.PNG

Reflect Boxes

If you need to reflect a box (or whatever) use:\reflectbox{...}

Example: \reflectbox{\fcolorbox{blue}{red}{2012\text{ is now!}}
LTX9.PNG

Phantom Boxes

Sometimes it is necessary to have these phantom boxes,for systems, control the height under a root, alignment on a formula, etc. It has these three commands:

\phantom{XXX} space as wide and high as three X’s
\hphantom{XXX} space as wide as three X’s; height 0
\vphantom{X} space of width 0, height = height of X
Example: \sqrt{b}+\sqrt{\vphantom{b}a}
LTXa.PNG

I think that's all for now, in the future (if I have time) will write a little about tables and matrices. JLaTeXMath supports many mathematical environments (whitout *) I recommend reading Short Math Guide for LATEX ftp://ftp.ams.org/ams/doc/amsmath/short-math-guide.pdf If other forum users wish to contribute with examples (math environments) would be great.

LATEX environment

JLaTeXMath provides a number of different environments work. Each environment begins and ends in the same manner. \begin{environment}[options]<br/> ...<br/> \end{environment} The following environments are supported:

• tabular • array • matrix (and variants) • eqnarray
• align • cases • split • multline

Tabular and Array

The tabular and array environment found in similar way, can be used to typeset material with optional horizontal and vertical lines. The options are:

l left-justified column c centered column r right-justified column
| vertical line || double vertical line & column separator
\\ start new row \hline|| horizontal line
Example:
\begin{tabular}{| l |c ||r |}
\hline
1 & 2 & 3 \\ \hline
4 & 5 & 6 \\ \hline
7 & 8 & 9 \\
\hline
\end{tabular}
LTEX1.PNG

Other example , using \multicolumn and array:

Example:
\begin{array}{|c|c|}
\hline
\multicolumn{2}{|c|}{\text{Title}} \\
\hline
x & y\\ \hline
a & b\\
c & c\\
d & e\\ \hline
\end{array}
LTEX2.PNG

If you need add column separator (+ for example) and space (1cm), use @{\hspace{1cm}+\hspace{1cm}}:

Example:
\begin{tabular}{r@{\hspace{1cm}+\hspace{1cm}}l}
1 & 23 \\
45 & 678\\
910& 1112\\
\end{tabular}
LTEX3.PNG

Matrix

A basic matrix may be created using the matrix environment, the structures is similar to table-array , entries are specified by row, with columns separated using & and a new rows separated with \\. Matrices are usually enclosed in delimiters (default none) of some kind, and while it is possible to use the \left and \right commands. The predefined environments which automatically include delimiters:

pmatrix ( ) bmatrix [ ] Bmatrix { }
vmatrix | | Vmatrix || ||
Example:
$\mathsf{A}_{m,n} =
\begin{Vmatrix}
a_{1,1} &a_{1,2} &\cdots &a_{1,n} \\
a_{2,1} &a_{2,2} &\cdots &a_{2,n} \\
\vdots & \vdots & \ddots &\vdots \\
a_{m,1} &a_{m,2} &\cdots &a_{m,n}
\end{Vmatrix}$
LTEX4.PNG

Small Matrix

Sometimes you need to write a matrix within text, for this environment have smallmatrix, this works the same way the matrix environment, for example:

Example:
\mathsf{M} =
\left\{ \begin{smallmatrix}
a&b\\ c&d
\end{smallmatrix} \right\}
LTEX5.PNG

Eqnarray

This environment is designed to write multiline equations or equations that exceed the width of line, it behaves like an array of three columns where the Vrst aligned right, center second and third left. The equations we want to present in this way must be enclosed between \begin{eqnarray} and \end{eqnarray}, an example:

Example:
\begin{eqnarray}
y &=& (x+1)^2 \\
&=& x^2+2x+1
\end{eqnarray}
LTEX6.PNG

Align

Like eqnarray, but more powerful, you can insert text between lines with the command \intertext{...}, for example:

Example:
\begin{align}
x+y-z &= 1\\
x-y+z &= 1\\
\intertext{text}
2x\hphantom{-y}+z &= 1
\end{align}
LTEX7.PNG

Cases

For piece wise function or definitions use cases environment:

Example:
\left\vert x\right\vert =
\begin{cases}
\hphantom{-}x &,\, \text{if }x\geq 0 ,\\
-x&,\, \text{if }x<0
\end{cases}
LTEX8.PNG

Split

For split long math block

Example:
\begin{split}
a& =b+c-d\\
& \quad +e-f\\
& =g+h\\
& =i
\end{split}
LTEX9.PNG

Multline

For multiple lines of math

Example:
\begin{multline}
\left(a+b+c+d+e\right)^2=a^2+b^2+c^2+d^2+e^2\\
+2ab+2ac+2ad+2ae+2bc+2bd+2be+2cd+2ce+2de
\end{multline}
LTEXa.PNG
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