function designkit_colorshift in DesignKit 6

Same name and namespace in other branches

1. 7 designkit.module \designkit_colorshift()

Apply a shift color to a source color by a certain opacity value.

Parameters

$source: An RGB hex string. The source color to which a shift should be applied. @param $shift An RGB hex string. The shift color which defines the color that the source should shift towards. @param $opacity A float between 0 and 1 that determines what opacity to use for the blending shift color. @return An RGB hex string.

File

./designkit.module, line 153

Code

function designkit_colorshift($source, $shift, $opacity = 0.5) {
  if (designkit_valid_color($source) && designkit_valid_color($shift)) {
    $source = _color_unpack($source, TRUE);
    $shift = _color_unpack($shift, TRUE);
    $shifted = array();
    foreach (array_keys($source) as $key) {

      // shifted = original color + (difference * opacity).
      $shifted[$key] = $source[$key] + ($shift[$key] - $source[$key]) * $opacity;
    }
    return _color_pack($shifted, TRUE);
  }
  return $source;
}