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/// 构建一个 HSV 数据集合 /// /// @param {number/deg} $h - 色相,值须在 [0deg, 360deg] 区间内,否则将以 360deg 取模; /// @param {number/%} $s - 对比度,值须在 [0%, 100%] 区间内,否则将抛出异常; /// @param {number/%} $v - 明度,值须在 [0%, 100%] 区间内,否则将抛出异常; /// /// @return {Map} /// /// 一个包含三个键值对的集合,分别为: /// /// - `h` `{number/deg}` 色相; /// - `s` `{number/%}` 饱和度; /// - `v` `{number/%}` 明度; @function hsv($h, $s, $v) { @if $s < 0 or $s > 100 or $v < 0 or $v > 100 { @error "must be between 0 and 100."; } @return ( h: $h % 360deg, s: $s + 0%, v: $v + 0%, __is-hsv: true ) } /// 将一个色值转换为 HSV 模式 /// /// TODO 不支持含有不透明度的色值,转换后将丢失其不透明度。 /// /// @link http://ariya.blogspot.com/2008/07/converting-between-hsl-and-hsv.html Converting between HSL and HSV /// /// @param {Color} $color - 待转换的色值; /// /// @return {Map} /// /// 一个包含三个键值对的集合,分别为: /// /// - `h` `{number/deg}` 色相; /// - `s` `{number/%}` 饱和度; /// - `v` `{number/%}` 明度; @function to-hsv($color) { @if (is-hsv($color)) { @return $color; } $h: hue($color); $s: saturation($color); $l: lightness($color); @if (unit($s) == '%') { $s: strip-unit($s) / 100; } @if (unit($l) == '%') { $l: strip-unit($l) / 100; } $l: $l * 2; $s: $s * ( if($l <= 1, $l, 2 - $l) ); @return hsv( $h, percentage(limit( 2 * $s / ( $l + $s ), 0, 1 )), percentage(limit( ($l + $s) / 2, 0, 1)), ); } /// 判断所传入的数据是否是由 `to-hsv` 方法所生成的 HSV 色值数据; /// @param {Map} $val - 待判断的值; /// @return {boolean} @function is-hsv($val) { @return type-of($val) == 'map' and map-get($val, __is-hsv) == true; } /// 获取一个色值所对应 HSV 模式中的色相值; /// @param {Color} $color - 一个颜色值(RGB,HSL 或是由 to-hsv 生成的 HSV 数据); /// @return {number/deg} /// /// @example scss /// $hue: hsv-hue(#f 0); // --> 0deg /// $hue: hsv-hue(hsl(120deg, 100%, 50%); // --> 120deg /// $hue: hsv-hue(to-hsv(#00f)); // --> 240deg @function hsv-hue($color) { @return map-get(to-hsv($color), h); } /// 获取一个色值所对应 HSV 模式中的饱和度值; /// @param {Color} $color - 一个颜色值(RGB,HSL 或是由 to-hsv 生成的 HSV 数据); /// @return {number/%} /// /// @example scss /// $hue: hsv-saturation(#f00); // --> 100% /// $hue: hsv-saturation(hsl(240deg, 60%, 50%); // --> 75% /// $hue: hsv-saturation(to-hsv(#ff8080)); // --> 49.8039215686% @function hsv-saturation($color) { @return map-get(to-hsv($color), s); } /// 获取一个色值所对应 HSV 模式中的明度值; /// @param {Color} $color - 一个颜色值(RGB,HSL 或是由 to-hsv 生成的 HSV 数据); /// @return {number/%} /// /// @example scss /// $hue: hsv-value(#f00); // --> 100% /// $hue: hsv-value(hsl(0deg, 100%, 37.5%); // --> 75% /// $hue: hsv-value(to-hsv(#800000)); // --> 50.1960784314% @function hsv-value($color) { @return map-get(to-hsv($color), v); } /// 将 hsv 转换为 hsl /// @param {Map} $val - 待转换的 HSV 色值数据; /// @return {Color<HSL>} @function hsv-to-hsl($hsv) { $h: hsv-hue($hsv); $s: hsv-saturation($hsv); $v: hsv-value($hsv); $s: 0 + ($s / 100%); $v: 0 + ($v / 100%); $l: (2 - $s) * $v; @return hsl( $h, percentage(limit($s * $v / (if($l <= 1, $l, 2 - $l)), 0, 1)), percentage(limit($l / 2, 0, 1)) ); } /// 将 hsv 转换为 rgb /// @link https://www.rapidtables.com/convert/color/hsv-to-rgb.html HSV to RGB /// @param {Map} $val - 待转换的 HSV 色值数据; /// @return {Color<RGB>} @function hsv-to-rgb($hsv) { $h: hsv-hue($hsv); $s: hsv-saturation($hsv); $v: hsv-value($hsv); $h: strip-unit($h); $s: strip-unit($s) / 100; $v: strip-unit($v) / 100; $c: $v * $s; $x: $c * (1 - abs(($h / 60) % 2 - 1)); $m: $v - $c; $rgb: (); @if 0 <= $h and $h < 60 { $rgb: ($c, $x, 0); } @else if 60 <= $h and $h < 120 { $rgb: ($x, $c, 0); } @else if 120 <= $h and $h < 180 { $rgb: (0, $c, $x); } @else if 180 <= $h and $h < 240 { $rgb: (0, $x, $c); } @else if 240 <= $h and $h < 300 { $rgb: ($x, 0, $c); } @else if 300 <= $h and $h < 360 { $rgb: ($c, 0, $x); } @return rgb( (nth($rgb, 1) + $m) * 255, (nth($rgb, 2) + $m) * 255, (nth($rgb, 3) + $m) * 255 ); }
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