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Help:Displaying a formula: Difference between revisions

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== =Color == =
Equations can use color: with the <code>\color</code> command. For example,
 
{| class="wikitable"▼
|-
! How it looks rendered
! Syntax
! Feature
|-
*:| <math>{\color{Blue}x^2}+{\color{YellowOrangeOrange}2x}-{\color{OliveGreenLimeGreen}1}</math>▼
| <syntaxhighlight lang="latex" inline>{\color{Blue}x^2}+{\color{Orange}2x}-{\color{LimeGreen}1}</syntaxhighlight>
|
|-
*:| <math>x_{1,2}x=\frac{{\color{Blue}-b}\pm\sqrt{\color{Red}b^2-4ac}}{\color{Green}2a}</math>▼
| {{nowrap|1=<syntaxhighlight lang="latex" inline>x=\frac{{\color{Blue}-b}\pm\sqrt{\color{Red}b^2-4ac}}{\color{Green}2a}</syntaxhighlight>}}
|
|}
 
The <code>\color</code> command colors all symbols to its right.
*<code>{\color{Blue}x^2}+{\color{YellowOrange}2x}-{\color{OliveGreen}1}</code>
However, if the <code>\color</code> command is enclosed in a pair of braces (e.g. <code>{\color{Red}...}</code>) then no symbols outside of those braces are affected.
▲*:<math>{\color{Blue}x^2}+{\color{YellowOrange}2x}-{\color{OliveGreen}1}</math>
 
{| class="wikitable"
|-
! How it looks rendered
! Syntax
! Feature
|-
| <math>e^x\color{i red}\pi} + 1neq y= 0\,z</math>▼
| <syntaxhighlight lang="latex" inline>x\color{red}\neq y=z</syntaxhighlight>
|
Colors <span style="color:red;">red</span> everything to the right of <code><nowiki>\color{red}</nowiki></code>. To only color the <math>\neq</math> symbol red, place braces around <code><nowiki>\color{red}\neq</nowiki></code> or insert <code><nowiki>\color{black}</nowiki></code> to the right of <code><nowiki>\neq</nowiki></code>.
|-
| <math>x{\color{red}\neq} y=z</math>
| <syntaxhighlight lang="latex" inline>x{\color{red}\neq} y=z</syntaxhighlight>
|
|-
| <math>x\color{red}\neq\color{black} y=z</math>
| <syntaxhighlight lang="latex" inline>x\color{red}\neq\color{black} y=z</syntaxhighlight>
|
|-
| <math>\frac{-b\color{Green}\pm\sqrt{b^2\color{Blue}-4{\color{Red}a}c}}{2a}=x</math>
| {{nowrap|1=<syntaxhighlight lang="latex" inline>\frac{-b\color{Green}\pm\sqrt{b^2\color{Blue}-4{\color{Red}a}c}}{2a}=x</syntaxhighlight>}}
| The outermost braces in <code>{\color{Red}a}c</code> limit the affect of <code>\color{Red}</code> to the symbol <code>a</code>. Similarly, <code>\color{Blue}</code> does not affect any symbols outside of the <code>\sqrt{}</code> that encloses it, and <code>\color{Green}</code> does not affect any symbols outside of the numerator.
|}
 
There are several alternate notations styles
*<code>x_{1,2}=\frac{-b\pm\sqrt{\color{Red}b^2-4ac}}{2a}</code>
▲*:<math>x_{1,2}=\frac{-b\pm\sqrt{\color{Red}b^2-4ac}}{2a}</math>
 
{| class="wikitable"
 
It is also possible to change the background color (since [[rev:59550|r59550]]), as in the following example:
▲{| class=wikitable
|-
! How it looks rendered
! Background
! Syntax
! Wikicode
! Feature
! Rendering (in PNG)
|-
▲*| <codemath>{\color{Blue}x^2}+{\color{YellowOrangeOrange}2x}-{\color{OliveGreenLimeGreen}1}</codemath>
! rowspan=2 | White
| <syntaxhighlight lang="latex" inline>{\color{Blue}x^2}+{\color{Orange}2x}-{\color{LimeGreen}1}</syntaxhighlight>
| <code>e^{i \pi} + 1 = 0</code>
| works with both texvc and MathJax
▲| <math>e^{i \pi} + 1 = 0\,</math>
|-
| <math>\color{Blue}x^2\color{Black}+\color{Orange}2x\color{Black}-\color{LimeGreen}1</math>
| <code>'''\definecolor{orange}{RGB}{255,165,0}\pagecolor{orange}'''e^{i \pi} + 1 = 0</code>▼
| {{nowrap|1=<syntaxhighlight lang="latex" inline>\color{Blue}x^2\color{Black}+\color{Orange}2x\color{Black}-\color{LimeGreen}1</syntaxhighlight>}}
| <math>\definecolor{orange}{RGB}{255,165,0}\pagecolor{orange}e^{i \pi} + 1 = 0\,</math></span>
| works with both texvc and MathJax
|-
| <math>\color{Blue}{x^2}+\color{Orange}{2x}-\color{LimeGreen}{1}</math>
! rowspan=2 | Orange
| <syntaxhighlight lang="latex" inline>\color{Blue}{x^2}+\color{Orange}{2x}-\color{LimeGreen}{1}</syntaxhighlight>
| <code>e^{i \pi} + 1 = 0</code>
| only works with MathJax
| style="background-color:orange;" | <math>e^{i \pi} + 1 = 0\,</math>▼
|-}
 
| <code>'''\definecolor{orange}{RGB}{255,165,0}\pagecolor{orange}'''e^{i \pi} + 1 = 0</code>
Some color names are predeclared according to the following table, you can use them directly for the rendering of formulas (or for declaring the intended color of the page background).
| style="background-color:orange;" | <math>\definecolor{orange}{RGB}{255,165,0}\pagecolor{orange}e^{i \pi} + 1 = 0\,</math>
 
{{Formula Supported Named Colors}}
 
Note that colorColor should not be used as the ''only'' way to identify something, because it will become meaningless on black-and-white media or for color-blind people. See [[WikipediaWP:Manual of Style (accessibility)#Color coding]].▼
 
Latex does not have a command for setting the background color. The most effective way of setting a background color is by setting a CSS styling rule for a table cell:
<pre style="display: inline-block;">
{| class="wikitable" align="center"
| style="background-color: gray;" | <math>x^2</math>
▲| style="background-color:orange Goldenrod;" | <math>ey^{i \pi} + 1 = 0\,3</math>
|}
</pre>
 
Rendered as:
{| class="wikitable" align="center"
| style="background-color: gray;" | <math>x^2</math>
| style="background-color: Goldenrod;" | <math>y^3</math>
|}
 
Custom colors can be defined using:
<!--T:73-->
<syntaxhighlight lang="latex">\definecolor{myorange}{rgb}{1,0.65,0.4}\color{myorange}e^{i \pi}\color{Black} + 1 = 0</syntaxhighlight>
See here for [http://oregonstate.edu/%7Epeterseb/tex/samples/docs/color-package-demo.pdf all named colors] supported by LaTeX.
 
▲| :<codemath>'''\definecolor{orangemyorange}{RGBrgb}{2551,1650.65,0.4}\pagecolorcolor{orangemyorange}'''e^{i \pi}\color{Black} + 1 = 0</codemath>
<!--T:74-->
▲Note that color should not be used as the ''only'' way to identify something, because it will become meaningless on black-and-white media or for color-blind people. See [[Wikipedia:Manual of Style#Color coding]].
 
== Formatting issues == <!--T:75-->
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