# \blackrule

## Syntax

 \blackrule[...,...=...,...] [...,...=...,...] see \setupblackrules

## Description

Draws a horizontal filled box, called rule.

## Arguments

The characteristics of this command can be set by \setupblackrules.

## Comment

Using this command is far more slower than using the TeX primitives `\hrule` and `\vrule`, but it save us some tokens.

Code is contained in pack-rul.mkii or pack-rul.mkiv.

## Example

```\setupcolors[state=start] %not needed in MkIV
\starttext
\blackrule %default rule

\blackrule[color=red, height=1em] %customized rule
\stoptext
```