# 83Plus:Basic:Graphics:Shade(

From WikiTI

## Contents

## Synopsis

**Token size:** 1 byte

**Syntax:** Shade(*lower_equation*,*upper equation*[,left_x_limit,right_x_limit[,pattern,pixel_frequency]])

Shades in an area between two equations.

## Outputs:

The area between *lower_equation* and *upper_equation* is shaded on the graph screen. The width can be specified with *left_x_limit* and *right_x_limit*. *pattern* and *pixel_frequency* can also be supplied to control the pattern used for shading.

Patterns are:

- 1: vertical
- 2: horizontal
- 3: slanted (top left to bottom right)
- 4: slanted (bottom left to top right)

## Comments

- If
*left_x_limit*and*right_x_limit*are left out, the entire area on the screen between the equations is filled - Both equations are drawn on the graph screen along with the shading
- ERR:DOMAIN if
*pattern*isn't a valid pattern number or*pixel_frequency*is too large - If
*pattern*and*pixel_frequency*are left out, the area will be filled with solid black

## Examples

To make a sort of Star Trek: Voyager logo:

:Shade(−X^2-2,−X^2+7,−10,10,3,2