A wrapper for the Dart color_models plugin with added support for Flutter's Color class

A wrapper for the Dart color_models plugin with added support for Flutter's Color class

flutter_color_models .A wrapper for the Dart color_models plugin with added support for Flutter's Color class


A wrapper for the color_models plugin that implements Flutter's [Color] class.

For use without Flutter, see: https://pub.dev/packages/color_models

Check out flutter_palette, a package for creating, generating, and modifying color palettes.


import 'package:flutter_color_models/flutter_color_models.dart';

Color Spaces

color_models exposes models for the CMYK, HSI, HSL, HSP, HSB, LAB, RGB, and XYZ color spaces; represented as [CmykColor], [HsiColor], [HslColor], [HspColor], [HsbColor], [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, 255]);
RgbColor.extrapolate(<num>[1.0, 0.0, 0.0, 255]);

// 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, 255]);
CmykColor.extrapolate(<num>[0.0, 1.0, 1.0, 0.0, 255]);

// 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, 255]);
HslColor.extrapolate(<num>[0.0, 1.0, 0.5, 255]);

Casting Color to and from the ColorModels

Each color model has method toColor() a static method fromColor() that will cast 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();

Due to the nature of this implementation, the base [ColorModel] lacks the [toColor] method. Instead, the global [toColor] method can be used.

// Cast a [ColorModel] to a [Color].
var color = toColor(color);

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();

HsbColor toHsbColor();

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 HSB color
HsbColor originalColor = HsbColor(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 HSB => HsbColor(0.3, 0.8, 0.7)
HsbColor hsbColor = HsbColor.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);

Interpolating Between Colors

Each color model has a method, [lerpTo], that calculates a specified number of steps between this color and a color provided to the method, returning all of the colors inbetween the two colors in a list. Colors will be returned in the color space of the color the method is called on.

final color1 = RgbColor(255, 0, 0); // red
final color2 = RgbColor(0, 0, 255); // blue

/// Calculate a [List<RgbColor>] of 5 colors: [color1], [color2] and the 3 steps inbetween.
final colors = color1.lerpTo(color2, 3);

// [RgbColor(255, 0, 0, 255), RgbColor(191, 0, 64, 255), RgbColor(128, 0, 128, 255), RgbColor(64, 0, 191, 255), RgbColor(0, 0, 255, 255)]

/// To return only the steps in between [color1] and [color2], the [excludeOriginalColors] parameter can be set to `true`.
final steps = color1.lerpTo(color2, 3, excludeOriginalColors: true);

// [RgbColor(191, 0, 64, 255), RgbColor(128, 0, 128, 255), RgbColor(64, 0, 191, 255)]

Download Details:

Author: james-alex

Source Code: https://github.com/james-alex/flutter_color_models

flutter dart mobile-apps

Bootstrap 5 Complete Course with Examples

Bootstrap 5 Tutorial - Bootstrap 5 Crash Course for Beginners

Nest.JS Tutorial for Beginners

Hello Vue 3: A First Look at Vue 3 and the Composition API

Building a simple Applications with Vue 3

Deno Crash Course: Explore Deno and Create a full REST API with Deno

How to Build a Real-time Chat App with Deno and WebSockets

Convert HTML to Markdown Online

HTML entity encoder decoder Online

Google's Flutter 1.20 stable announced with new features - Navoki

Google has announced new flutter 1.20 stable with many improvements, and features, enabling flutter for Desktop and Web

Top 25 Flutter Mobile App Templates in 2020

Flutter has been booming worldwide from the past few years. While there are many popular mobile app development technologies out there, Flutter has managed to leave its mark in the mobile application development world. In this article, we’ve curated the best Flutter app templates available on the market as of July 2020.

Flutter App Development Trends 2020

As the new decade dawns upon us, a slew of technologies has been making a lot of noise to grab the developers’ attention. While native app development is going strong, the trade winds are now blowing towards going cross-platform.

How To Succeed In Mobile App Wireframe Design?

This article covers everything about mobile app wireframe design: what to do and what not, tools used in designing a mobile or web app wireframe, and more.

What is Flutter and why you should learn it?

Flutter is an open-source UI toolkit for mobile developers, so they can use it to build native-looking Android and iOS applications from the same code base for both platforms. Flutter is also working to make Flutter apps for Web, PWA (progressive Web-App) and Desktop platform (Windows,macOS,Linux).