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// SVG Utilities
// =============
// SVG Validate Units
// ------------------
/// Make sure a length is supported in svg
///
/// @access private
///
/// @param {Length} $length -
/// The length to validate
/// @param {String} $name [null] -
/// Optional name of length origin,
/// for error reporting
///
/// @return {Length} -
/// An svg-validated length, or comparable valid length
@function _susy-svg-validate-units(
$length,
$name: null
) {
$_svg-units: ('em', 'ex', 'px', 'pt', 'pc', 'cm', 'mm', 'in', '%');
$string: type-of($length) == 'string';
@if ($length == 0) or ($string) or index($_svg-units, unit($length)) {
@return $length;
}
@return _susy-error(
'`#{unit($length)}` #{$name} units are not supported in SVG',
'_susy-svg-validate-units');
}
// SVG Rect
// --------
/// Build a single svg rectangle
///
/// @access private
///
/// @param {Length} $x -
/// Horizontal position for the rectangle
/// @param {Length} $width -
/// Width of the rectangle
/// @param {Length} $offset [null] -
/// Offset the rectangle, to account for edge gutters
///
/// @return {String} -
/// Escaped string representing one svg rectangle
@function _susy-svg-rect(
$x,
$width,
$offset: null
) {
$x: _susy-svg-validate-units($x);
$width: _susy-svg-validate-units($width);
$offset: if($offset == 0, null, $offset);
@if (type-of($offset) == 'number') and (type-of($x) == 'number') {
@if comparable($x, $offset) {
$x: $x + $offset;
} @else {
$x: 'calc(#{$x} + #{$offset})';
}
} @else if $offset and ($x != 0) {
$x: 'calc(#{$x} + #{$offset})';
} @else if $offset {
$x: $offset;
}
@return '%3Crect x="#{$x}" width="#{$width}" height="100%"/%3E';
}
// SVG Color
// ---------
/// Stringify colors, and escape hex symbol
///
/// @access private
///
/// @param {Color} $color -
/// Color to stringify and escape
///
/// @return {String} -
/// Escaped string value of color
@function _susy-svg-color(
$color
) {
$color: inspect($color); // convert to string
@if (str-index($color, '#') == 1) {
$color: '%23' + str-slice($color, 2);
}
@return $color;
}
// SVG Gradient
// ------------
/// Create a multi-color svg gradient
///
/// @access private
///
/// @param {List} $colors -
/// List of colors to be equally spaced from `0%` to `100%`
/// in each column rectangle
///
/// @return {String} -
/// Escaped string representing one svg gradient
/// (`id="susy-svg-gradient"`)
@function _susy-svg-gradient(
$colors
) {
$gradient: '%3Cdefs%3E%3ClinearGradient spreadMethod="pad"';
$gradient: '#{$gradient} id="susy-svg-gradient"';
$gradient: '#{$gradient} x1="0%" y1="0%" x2="100%" y2="0%"%3E';
@for $i from 1 through length($colors) {
$color: _susy-svg-color(nth($colors, $i));
$offset: percentage(($i - 1) / (length($colors) - 1));
$stop: '%3Cstop offset="#{$offset}" style="stop-color:#{$color};" /%3E';
$gradient: $gradient + $stop;
}
@return $gradient + '%3C/linearGradient%3E%3C/defs%3E';
}
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