atan()
The atan()
CSS function is a trigonometric function that returns the inverse tangent of a number between -∞
and +∞
. The function contains a single calculation that returns the number of radians representing an <angle>
between -90deg
and 90deg
.
Syntax
css
/* Single <number> values */
transform: rotate(atan(1));
transform: rotate(atan(4 * 50));
/* Other values */
transform: rotate(atan(pi / 2));
transform: rotate(atan(e * 3));
Parameter
The atan(number)
function accepts only one value as its parameter.
number
-
A calculation which resolves to a
<number>
between-∞
and+∞
.
Return value
The inverse tangent of an number
will always return an <angle>
between -90deg
and 90deg
.
- If
number
is0⁻
, the result is0⁻
. - If
number
is+∞
the result is90deg
. - If
number
is-∞
the result is-90deg
.
That is:
atan(-infinity)
representing-90deg
.atan(-1)
representing-45deg
atan(0)
representing0deg
atan(1)
representing45deg
atan(infinity)
representing90deg
.
Formal syntax
Examples
Rotate elements
The atan()
function can be used to rotate
elements as it return an <angle>
.
HTML
html
<div class="box box-1"></div>
<div class="box box-2"></div>
<div class="box box-3"></div>
<div class="box box-4"></div>
<div class="box box-5"></div>
CSS
css
div.box {
width: 100px;
height: 100px;
background: linear-gradient(orange, red);
}
div.box-1 {
transform: rotate(atan(-99999));
}
div.box-2 {
transform: rotate(atan(-1));
}
div.box-3 {
transform: rotate(atan(0));
}
div.box-4 {
transform: rotate(atan(1));
}
div.box-5 {
transform: rotate(atan(99999));
}
Result
Specifications
Specification |
---|
CSS Values and Units Module Level 4 # trig-funcs |
Browser compatibility
BCD tables only load in the browser