Smooth Gradient Sass Function

https://smooth-gradient-sass-function.dskd.jp/

Inspired by Naoki Matsuda's Pen & Lukas Hermann's Pen.

• v3.x is compatible to dart-sass.
• v2.x is compatible to libsass(node-sass).

You can get smooth gradient sass function

Gradients are scrim, easeOutSine, and clothoid curve.

// `scrim` smoothing
@function scrim($color: #000000, $opacity: 1, $start: 0, $end: 100%) {
  // validate arguments
  // ...

  $scrim: (
    1: 0,
    0.738: 0.19,
    0.541: 0.34,
    0.382: 0.47,
    0.278: 0.565,
    0.194: 0.65,
    0.126: 0.73,
    0.075: 0.802,
    0.042: 0.861,
    0.021: 0.91,
    0.008: 0.952,
    0.002: 0.982,
    0: 1,
  );
  @return _make-gradient-list($scrim, $color, $opacity, $start, $end);
}

@function _make-gradient-list($map, $color, $opacity, $start, $end) {
  $color-stops: ();
  @each $key, $mod in $map {
    $position: $mod * ($end - $start) + $start;
    $new-stop: color.change($color, $alpha: $key * $opacity);
    $color-stops: list.append($color-stops, $new-stop $position, "comma");
  }
  @return $color-stops;
}

// `easeOutSine` smoothing
@function easeOutSine($color: #000000, $opacity: 1, $start: 0, $end: 100%) {
  // validate arguments
  // ...

  $easeOutSine: (
    1: 0,
    0.917: 0.053,
    0.834: 0.106,
    0.753: 0.159,
    0.672: 0.213,
    0.591: 0.268,
    0.511: 0.325,
    0.433: 0.384,
    0.357: 0.445,
    0.283: 0.509,
    0.213: 0.577,
    0.147: 0.65,
    0.089: 0.729,
    0.042: 0.814,
    0.011: 0.906,
    0: 1,
  );
  @return _make-gradient-list($easeOutSine, $color, $opacity, $start, $end);
}

// `clothoid` smoothing
@function clothoid($color: #000000, $opacity: 1, $start: 0, $end: 100%) {
  // validate arguments
  // ...

  $clothoid: (
    1: 0,
    0.3: 0.5,
    0.15: 0.65,
    0.075: 0.755,
    0.037: 0.8285,
    0.019: 0.88,
    0: 1,
  );
  @return _make-gradient-list($clothoid, $color, $opacity, $start, $end);
}

Usage

from git

1. git clone and move to your project.

git clone [e-mail]:oti/smooth-gradient-sass-function.git
mv smooth-gradient-sass-function/src/_smooth-gradient.scss your/project/scss/path

2. @use in your .scss file.

@use "your/project/scss/path/smooth-gradient" as gradients;

from npm

1. npm install.

npm i smooth-gradient-sass-function

2. @use in your .scss file.

@use "../(to project root)/node_modules/smooth-gradient-sass-function" as gradients;

write function

3. write gradients.scrim() sass function and argument in argument of native linear-gradient() function.

.elem {
  // default color is `#000`, start opacity is `1`
  background-image: linear-gradient(to bottom, gradients.scrim());
}

Any angel, Any color, Any opacity

.box {
  // start left
  background-image: linear-gradient(to right, gradients.scrim());
}

.box {
  // start left bottom
  background-image: linear-gradient(45deg, gradients.scrim());
}

.box {
  // 1st arg is start color code(default: #000)
  background-image: linear-gradient(to bottom, gradients.scrim(#ff0000));
}

.box {
  // 2nd arg is start opacity(default: 1)
  background-image: linear-gradient(to bottom, gradients.scrim(#ffff00, 0.5));
}

.box {
  // 3rd arg is start position
  background-image: linear-gradient(
    to bottom,
    gradients.scrim(#ffff00, 0.5, $start: 50%)
  );
}

.box {
  // 4th arg is end position
  background-image: linear-gradient(
    to bottom,
    gradients.scrim(#ffff00, 0.5, $start: 0, $end: 16em)
  );
}

LICENSE

MIT license Copyright (c) 2018 oti