setalpha

A convenience package for setting and accessing web colors, adjusting the alpha levels of given colors and mixing new colors.

Demos

• Color Breakdown

A little app that demonstrates color manipulation, component data, finding similar colors and setting alpha levels using setalpha.

• Falco Shapes

A little combinatorics game based on Marsha Falco's game of Set; setalpha was used to color the pieces on the board.

Usage

Simple usage examples:

• Conveniently get properties of a color.

final ps = ColorProperties(Color.cornflowerBlue);
  print("""
         Color: $ps

           Red: ${ps.red}
         Green: ${ps.green}
          Blue: ${ps.blue}
         Alpha: ${ps.alpha}
        Chroma: ${ps.chroma}
           Hue: ${ps.hueInDegrees}
     Intensity: ${ps.intensity}
     Lightness: ${ps.lightness}
    Saturation: ${ps.saturation}
  """);

         Color: #6495EDFF

           Red: 100
         Green: 149
          Blue: 237
         Alpha: 1.0
        Chroma: 0.5372549019607844
           Hue: 218.54014598540147
     Intensity: 0.6352941176470589
     Lightness: 0.6607843137254902
    Saturation: 0.7919075144508672

• Also works with hex, rgb, rgba, hsl, hsla expressions:

  // Change the color the ColorProperties instance points to...
  ps.color = "rgba(50,150,200,0.75)";
  print("""
         Color: $ps

           Red: ${ps.red},
         Green: ${ps.green}
          Blue: ${ps.blue}
         Alpha: ${ps.alpha}
        Chroma: ${ps.chroma}
           Hue: ${ps.hueInDegrees}
     Intensity: ${ps.intensity}
     Lightness: ${ps.lightness}
    Saturation: ${ps.saturation}
  """);

         Color: #3296C8BF

           Red: 50,
         Green: 150
          Blue: 200
         Alpha: 0.7490196078431373
        Chroma: 0.5882352941176471
           Hue: 199.99999999999997
     Intensity: 0.5228758169934641
     Lightness: 0.49019607843137253
    Saturation: 0.6000000000000001

• Get cornflowerblue with an alpha value of 0.5.

print(setAlpha(Color.cornflowerBlue, 0.5));

#6495ED80

• Also works for other hex and hsl expressions...

print(setAlpha("#6495ED", 0.5));
print(setAlpha("hsl(218.54deg, 79%, 66%)", 0.5));

#6495ED80
#6495ED80

• Which web colors are nearest cornflourblue in RGB-space?

for (final neighbor in colorsNearestRGB(Color.cornflowerBlue, 3)) {
    print(neighbor);
}

cornflowerblue
mediumslateblue
royalblue

• ... and in HSL-space?

for (final neighbor in colorsNearestHSL(Color.cornflowerBlue, 3)) {
    print(neighbor);
}

cornflowerblue
royalblue
skyblue

• Let's mix 3 parts cornflowerblue with 2 parts maroon...

print(colorMix([Color.cornflowerBlue, Color.maroon], [3, 2]));

#6F598EFF

Features and bugs

Please file feature requests and bugs at the issue tracker.