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• Cancel

cancelElement

Element functions can be customized with set and show rules.

Displays a diagonal line over a part of an equation.

This is commonly used to show the elimination of a term.

Example

Here, we can simplify:
$ (a dot b dot cancel(x)) /
    cancel(x) $

Parameters

body

content

RequiredPositional

Positional parameters are specified in order, without names.

The content over which the line should be placed.

length

relative

Settable

Settable parameters can be customized for all following uses of the function with a set rule.

Default: 100% + 0.3em

The length of the line, relative to the length of the diagonal spanning the whole element being “cancelled”. A value of 100% would then have the line span precisely the element’s diagonal.

View example

$ a + cancel(x, length: #200%)
    - cancel(x, length: #200%) $

inverted

bool

Settable

Settable parameters can be customized for all following uses of the function with a set rule.

Default: false

Whether the cancel line should be inverted (flipped along the y-axis). For the default angle setting, inverted means the cancel line points to the top left instead of top right.

View example

$ (a cancel((b + c), inverted: #true)) /
    cancel(b + c, inverted: #true) $

cross

bool

Settable

Settable parameters can be customized for all following uses of the function with a set rule.

Default: false

Whether two opposing cancel lines should be drawn, forming a cross over the element. Overrides inverted.

View example

$ cancel(Pi, cross: #true) $

angle

auto or angle or function

Settable

Settable parameters can be customized for all following uses of the function with a set rule.

Default: auto

How much to rotate the cancel line.

• If given an angle, the line is rotated by that angle clockwise with respect to the y-axis.
• If auto, the line assumes the default angle; that is, along the rising diagonal of the content box.
• If given a function angle => angle, the line is rotated, with respect to the y-axis, by the angle returned by that function. The function receives the default angle as its input.

View example

$ cancel(Pi)
  cancel(Pi, angle: #0deg)
  cancel(Pi, angle: #45deg)
  cancel(Pi, angle: #90deg)
  cancel(1/(1+x), angle: #(a => a + 45deg))
  cancel(1/(1+x), angle: #(a => a + 90deg)) $

stroke

length or color or gradient or stroke or tiling or dictionary

Settable

Settable parameters can be customized for all following uses of the function with a set rule.

Default: 0.05em

How to stroke the cancel line.

View example

$ cancel(
  sum x,
  stroke: #(
    paint: red,
    thickness: 1.5pt,
    dash: "dashed",
  ),
) $

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