83Plus:Basic:Graphics:Shade(

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