flutter_color_models #

A wrapper for the color_models plugin with added support for Flutter's [Color] class.

See: https://pub-web.flutter-io.cn/packages/color_models

Usage #

import 'package:flutter_color_models/flutter_color_models.dart';

Color Spaces #

color_models exposes models for the CMYK, HSI, HSL, HSP, HSV, LAB, RGB, and XYZ color spaces; represented as [CmykColor], [HsiColor], [HslColor], [HspColor], [HsvColor], [LabColor], [RgbColor], and [XyzColor] respectively.

Each model is constant and extends [ColorModel].

Creating Colors #

Colors can be created by constructing a [ColorModel] directly, or with the [fromList] or [extrapolate] constructors. [extrapolate] accepts each model's respective values on a 0 to 1 scale, and extrapolates them to their normal scale.

Each model posesses values for each property of their respective acronyms, as well as an optional [alpha] value.

// Each of the below colors is red at 100% opacity.

// RGB without alpha
RgbColor(255, 0, 0);
RgbColor.fromList(<num>[255, 0, 0]);
RgbColor.extrapolate(<num>[1.0, 0.0, 0.0]);

// RGB with alpha
RgbColor(255, 0, 0, 1.0);
RgbColor.fromList(<num>[255, 0, 0, 1.0]);
RgbColor.extrapolate(<num>[1.0, 0.0, 0.0, 1.0]);

// CMYK without alpha
CmykColor(0.0, 100.0, 100.0, 0.0);
CmykColor.fromList(<num>[0.0, 100.0, 100.0, 0.0]);
CmykColor.extrapolate(<num>[0.0, 1.0, 1.0, 0.0]);

// CMYK with alpha
CmykColor(0.0, 100.0, 100.0, 0.0, 1.0);
CmykColor.fromList(<num>[0.0, 100.0, 100.0, 0.0, 1.0]);
CmykColor.extrapolate(<num>[0.0, 1.0, 1.0, 0.0, 1.0]);

// HSL without alpha
HslColor(0.0, 100.0, 50.0);
HslColor.fromList(<num>[0.0, 100.0, 50.0]);
HslColor.extrapolate(<num>[0.0, 1.0, 0.5]);

// HSL with alpha
HslColor(0.0, 100.0, 50.0, 1.0);
HslColor.fromList(<num>[0.0, 100.0, 50.0, 1.0]);
HslColor.extrapolate(<num>[0.0, 1.0, 0.5, 1.0]);

Casting Color to and from the ColorModels #

Each color model has method toColor() a static method fromColor() that will recast a [Color] to a [ColorModel] and vice versa, converting the color to desired color space if not called on [RgbColor].

Color color = Color(0xFFFFFF00); // yellow

CmykColor cmykColor = CmykColor.fromColor(color);
color = cmykColor.toColor();

HsiColor hsiColor = HsiColor.fromColor(color);
color = hsiColor.toColor();

HslColor hslColor = HslColor.fromColor(color);
color = hslColor.toColor();

HspColor hspColor = HspColor.fromColor(color);
color = hspColor.toColor();

HsvColor hsvColor = HsvColor.fromColor(color);
color = hsvColor.toColor();

LabColor labColor = LabColor.fromColor(color);
color = labColor.toColor();

RgbColor rgbColor = RgbColor.fromColor(color);
color = rgbColor.toColor();

XyzColor xyzColor = XyzColor.fromColor(color);
color = xyzColor.toColor();

Converting Colors Between Spaces #

Each color model has methods to convert itself to each of the other color models.

CmykColor toCmykColor();

HsiColor toHsiColor();

HslColor toHslColor();

HspColor toHspColor();

HsvColor toHsvColor();

LabColor toLabColor();

RgbColor toRgbColor();

XyzColor toXyzColor();

Altenatively, each color model has a constructor [ColorModel.from] that can accept a color from any color space and returns its own type (T).

// Create a HSV color
HsvColor originalColor = HsvColor(0.3, 0.8, 0.7);

// Convert it to RGB => RgbColor(64, 179, 36)
RgbColor rgbColor = RgbColor.from(originalColor);

// Then to CMYK => CmykColor(64.25, 0, 79.89, 29.8)
CmykColor cmykColor = CmykColor.from(rgbColor);

// Back to HSV => HsvColor(0.3, 0.8, 0.7)
HsvColor hsvColor = HsvColor.from(cmykColor);

Note: All color conversions use the RGB color space as an intermediary. To minimize the loss of precision when converting between other color spaces, [RgbColor] privately stores the RGB values as [num]s rather than [int]s. The [num] values can be returned as a list with [RgbColor]'s toPreciseList() method.

Color Adjustments #

For convenience, each [ColorModel] has 2 getters, [inverted] and [opposite], and 3 methods, [cooler], [warmer] and [rotateHue], for generating new colors.

[inverted] inverts the colors properties within their respective ranges, excluding hue, which is instead rotated 180 degrees.

final orange = RgbColor(255, 144, 0);

print(orange.inverted); // RgbColor(0, 111, 255);

[opposite] returns the color with the hue opposite this. [opposite] is shorthand for color.rotateHue(180).

[rotateHue] rotates the hue of the color by the [amount] specified in degrees. Colors in the CMYK, LAB, RGB, and XYZ color spaces will be converted to and from the HSL color space where the hue will be rotated.

final orange = RgbColor(255, 144, 0);

print(orange.opposite); // RgbColor(0, 111, 255);

print(orange.rotateHue(30)); // RgbColor(239, 255, 0);

print(orange.rotateHue(-30)); // RgbColor(255, 17, 0);

[warmer] and [cooler] will rotate the hue of the color by the [amount] specified towards 90 degrees and 270 degrees, respectively. The hue's value will be capped at 90 or 270.

final orange = RgbColor(255, 144, 0);

print(orange.warmer(30)); // RgbColor(239, 255, 0);

print(orange.cooler(30)); // RgbColor(255, 17, 0);