/// Convert angle
/// @author Chris Eppstein
/// @param {Number} $value - Value to convert
/// @param {String} $unit - Unit to convert to
/// @return {Number} Converted angle
@function convert-angle($value, $unit) {
$convertable-units: deg grad turn rad;
$conversion-factors: 1 (10grad/9deg) (1turn/360deg) (3.1415926rad/180deg);
@if index($convertable-units, unit($value)) and index($convertable-units, $unit) {
@return $value
/ nth($conversion-factors, index($convertable-units, unit($value)))
* nth($conversion-factors, index($convertable-units, $unit));
}
@warn "Cannot convert `#{unit($value)}` to `#{$unit}`.";
}
/// Test if `$value` is an angle
/// @param {*} $value - Value to test
/// @return {Bool}
@function is-direction($value) {
$is-direction: index((to top, to top right, to right top, to right, to bottom right, to right bottom, to bottom, to bottom left, to left bottom, to left, to left top, to top left), $value);
$is-angle: type-of($value) == 'number' and index('deg' 'grad' 'turn' 'rad', unit($value));
@return $is-direction or $is-angle;
}
/// Convert a direction to legacy syntax
/// @param {Keyword | Angle} $value - Value to convert
/// @require {function} is-direction
/// @require {function} convert-angle
@function legacy-direction($value) {
@if is-direction($value) == false {
@warn "Cannot convert `#{$value}` to legacy syntax because it doesn't seem to be an angle or a direction";
}
$conversion-map: (
to top : bottom,
to top right : bottom left,
to right top : left bottom,
to right : left,
to bottom right : top left,
to right bottom : left top,
to bottom : top,
to bottom left : top right,
to left bottom : right top,
to left : right,
to left top : right bottom,
to top left : bottom right
);
@if map-has-key($conversion-map, $value) {
@return map-get($conversion-map, $value);
}
@return 90deg - convert-angle($value, 'deg');
}
/// Mixin printing a linear-gradient
/// as well as a plain color fallback
/// and the `-webkit-` prefixed declaration
/// @access public
/// @param {String | List | Angle} $direction - Linear gradient direction
/// @param {Arglist} $color-stops - List of color-stops composing the gradient
@mixin linear-gradient($direction, $color-stops...) {
@if is-direction($direction) == false {
$color-stops: ($direction, $color-stops);
$direction: 180deg;
}
background: nth(nth($color-stops, 1), 1);
background: -webkit-linear-gradient(legacy-direction($direction), $color-stops);
background: linear-gradient($direction, $color-stops);
}
SASS mixin «linear-gradient»
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