React-artboard: A Realistic Paint Component

React-artboard

A freeform sketching component for React. Try the demo

react-artboard includes an Artboard component and several tools, including a realistic paintbrush, a marker pen and airbrush, as well as the abstract shading tool. Tools are implemented as custom hooks, so you can add your own brushes and other tools.

Installation

npm install react-artboard

Usage

For a full usage example, see this file. The simplest usage of the component is like this:

import React from "react";
import { useBrush, Artboard } from "react-artboard";
export function App() {
  const brush = useBrush({ color: "#663399", strokeWidth: 40 });

  return <Artboard tool={brush} style={{ width: 800, height: 600 }} />;
}

You probably want to allow users to change the colors and size of the brush. Here is an example that uses native color and range inputs:

import React, { useState } from "react";
import { useBrush, Artboard } from "react-artboard";
export function App() {
  const [color, setColor] = useState("#993366");
  const [strokeWidth, setStrokeWidth] = useState(40);
  const brush = useBrush({ color, strokeWidth });

  return (
    <main>
      <div>
        <input
          type="color"
          value={color}
          onInput={(evt) => setColor(evt.currentTarget.value)}
        />
        <input
          type="range"
          min={5}
          max={50}
          value={strokeWidth}
          onInput={(evt) => setStrokeWidth(parseInt(evt.currentTarget.value))}
        />
      </div>
      <Artboard tool={brush} style={{ width: 800, height: 600 }} />
    </main>
  );
}

You could use a custom component instead of these inputs if you want more control over them, as long as they return a number for the brush size and a string for the color.

If you want to export your creations or clear the canvas, you can use the ref like this:

import React, { useState } from "react";
import { useBrush, Artboard } from "react-artboard";
export function App() {
  const [color, setColor] = useState("#993366");
  const [strokeWidth, setStrokeWidth] = useState(40);
  const brush = useBrush({ color, strokeWidth });

  const [artboardRef, setArtboardRef] = useState();

  return (
    <main>
      <div>
        <button onClick={() => artboardRef?.download()}>Download</button>
        <button onClick={() => artboardRef?.clear()}>Clear</button>
        <input
          type="color"
          value={color}
          onInput={(evt) => setColor(evt.currentTarget.value)}
        />
        <input
          type="range"
          min={5}
          max={50}
          value={strokeWidth}
          onInput={(evt) => setStrokeWidth(parseInt(evt.currentTarget.value))}
        />
      </div>
      <Artboard tool={brush} style={{ width: 800, height: 600 }} />
    </main>
  );
}

API

Artboard

Props

tool

This is the tool returned by the useBrush() hook. You can also implement your own tools and pass them in here.

ref

This accepts a callback that will be passed a ref that you can use to make the following calls:

download: (filename: string, type: string) => void

Downloads the canvas as an image. You can pass in a filename (default "image.png"), and a mimetype (default "image/png"). If you pass an unsupported type it will fallback to PNG.

getImageAsDataUri: (type: string) => string | undefined

Returns the image as a data URI, which can be displayed in an <img> tag for example.

clear: () => void

Clears the image

context: CanvasRenderingContext2D | null | undefined

Canvas rendering context

onStartStroke: (point: Point) => void

Callback at the start of a stroke

onContinueStroke: (point: Point) => void

Callback at the continuing of a stroke

onEndStroke: () => void

Callback at the end of a stroke

Paintbrush

useBrush(options)

Options

• color A CSS string color.
• strokeWidth The width of the brush

Shading

useShadingBrush()

This tools is inspired by some blog posts, exploring the use of "neighbour point" sketching. It gives a fun, unusual effect that is similar to pencil shading. It is highly configurable, giving quite different effects according to the different parameters.

Options

• color A CSS string color. Default: #000000
• spreadFactor The length of the connecting line. A value of 1 means it exactly joins the two points, while 0.5 only covers half the distance. A value above 1 gives a "fur" effect as the line extends beyond the points. Default: 0.9
• distanceThreshold How near the point needs to be to join, in pixels. Default: 50
• neighbourStrokeWidth Width of the stroke joining the points. Default: 1
• neighbourColor Color of the line joining the points. Default: color value with 0.2 alpha

Watercolor

useWatercolor(options)

Options

• color A CSS string color.
• strokeWidth The width of the brush

Marker pen

useMarker(options)

Options

• color A CSS string color.
• strokeWidth The width of the brush

Airbrush

useAirbrush(options)

Options

• color A CSS string color.
• strokeWidth The width of the brush

Custom brushes

See the source for useBrush to see how to create a brush. It must return an object, with the following optional callbacks:

• startStroke?: (point: Point, context: CanvasRenderingContext2D) => void
• continueStroke?: (point: Point, context: CanvasRenderingContext2D) => void
• endStroke?: (context: CanvasRenderingContext2D) => void
• cursor?: string A CSS-compatible string for the cursor to display. You can use the circleCursor() helper to display a resizable circle for the cursor

History

The useHistory() hook allows undo/redo functionality. Pass it a size value to limit the size of the history stack. It returns and object with the following:

• history: The History object. Pass this to the Artboard.
• undo(): Reverts the image to the previous state.
• redo(): Move forward in history, if available.
• canUndo: History is available to undo
• canRedo: History is available to redo

Sources

These posts gave inspiration, particularly for the shading tool.

• Exploring canvas drawing techniques
• Harmony brush adoption in Krita: Sketch

Inspiration for the watercolor tool:

• Generative watercolor in Processing
• How to hack a painting

---

Download Details:

Author: ascorbic
Source Code: https://github.com/ascorbic/react-artboard 
License: MIT Licence

#react #paint #application 

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How native is React Native? | React Native vs Native App Development

If you are undertaking a mobile app development for your start-up or enterprise, you are likely wondering whether to use React Native. As a popular development framework, React Native helps you to develop near-native mobile apps. However, you are probably also wondering how close you can get to a native app by using React Native. How native is React Native?

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Let’s briefly set the context first. We will briefly touch upon what React Native is and how it differs from earlier hybrid frameworks.

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What is React.js?

Facebook built and maintains React.js, an open-source JavaScript library for designing development tools. React.js is used to create single-page applications (SPAs) that can be used in conjunction with React Native to develop native cross-platform apps.

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• React Native, in essence, takes the same conceptual UI cornerstones as standard iOS and Android apps and assembles them using React.js syntax to create a rich mobile experience.

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In the United States, the average React developer salary is $94,205 a year, or $30-$48 per hour, This is one of the highest among JavaScript developers. The starting salary for junior React.js developers is $60,510 per year, rising to $112,480 for senior roles.

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However, the need for React.js and React Native developer is outpacing local labour markets. As a result, many businesses have difficulty locating and recruiting them locally.

It’s no surprise that for US and European companies looking for professional and budget engineers, offshore regions like India are becoming especially interesting. This area has a large number of app development companies, a good rate with quality, and a good pool of React.js front-end developers.

As per Linkedin, the country’s IT industry employs over a million React specialists. Furthermore, for the same or less money than hiring a React.js programmer locally, you may recruit someone with much expertise and a broader technical stack.

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• Conduct thorough candidate research, including portfolios and areas of expertise.
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React is a very strong framework. React.js makes use of a powerful synchronization method known as Virtual DOM, which compares the current page architecture to the expected page architecture and updates the appropriate components as long as the user input.

React is scalable. it utilises a single language, For server-client side, and mobile platform.

React is steady.React.js is completely adaptable, which means it seldom, if ever, updates the user interface. This enables legacy projects to be updated to the most new edition of React.js without having to change the codebase or make a few small changes.

React is adaptable. It can be conveniently paired with various state administrators (e.g., Redux, Flux, Alt or Reflux) and can be used to implement a number of architectural patterns.

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The need for React.js developers is rising at an unparalleled rate. React.js is currently used by over one million websites around the world. React is used by Fortune 400+ businesses and popular companies such as Facebook, Twitter, Glassdoor and Cloudflare.

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React Starter Kit: Build Web Apps with React, Relay and GraphQL.

React Starter Kit — "isomorphic" web app boilerplate   

React Starter Kit is an opinionated boilerplate for web development built on top of Node.js, Express, GraphQL and React, containing modern web development tools such as Webpack, Babel and Browsersync. Helping you to stay productive following the best practices. A solid starting point for both professionals and newcomers to the industry.

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Hiring

Getting Started

• Follow the getting started guide to download and run the project (Node.js >= 8.16.2)
• Check the code recipes used in this boilerplate, or share yours

Customization

The master branch of React Starter Kit doesn't include a Flux implementation or any other advanced integrations. Nevertheless, we have some integrations available to you in feature branches that you can use either as a reference or merge into your project:

• feature/redux (PR) — isomorphic Redux by Pavel Lang (see how to integrate Redux) (based on master)
• feature/apollo (PR) — isomorphic Apollo Client by Pavel Lang (see Tracking PR #1147) (based on feature/redux)
• feature/react-intl (PR) — isomorphic Redux and React Intl by Pavel Lang (see how to integrate React Intl) (based on feature/apollo)
• feature/apollo-pure (PR) — Apollo devtools and TypeScript integration by piglovesyou (based on master)

You can see status of most reasonable merge combination as PRs labeled as TRACKING

If you think that any of these features should be on master, or vice versa, some features should removed from the master branch, please let us know. We love your feedback!

Comparison

	React Starter Kit	React Static Boilerplate	ASP.NET Core Starter Kit
App type	Isomorphic (universal)	Single-page application	Single-page application
Frontend
Language	JavaScript (ES2015+, JSX)	JavaScript (ES2015+, JSX)	JavaScript (ES2015+, JSX)
Libraries	React, History, Universal Router	React, History, Redux	React, History, Redux
Routes	Imperative (functional)	Declarative	Declarative, cross-stack
Backend
Language	JavaScript (ES2015+, JSX)	n/a	C#, F#
Libraries	Node.js, Express, Sequelize, GraphQL	n/a	ASP.NET Core, EF Core, ASP.NET Identity
SSR	Yes	n/a	n/a
Data API	GraphQL	n/a	Web API

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♥ React Starter Kit? Help us keep it alive by donating funds to cover project expenses via OpenCollective or Bountysource!

 

How to Contribute

Anyone and everyone is welcome to contribute to this project. The best way to start is by checking our open issues, submit a new issue or feature request, participate in discussions, upvote or downvote the issues you like or dislike, send pull requests.

Learn More

• Getting Started with React.js
• Getting Started with GraphQL and Relay
• React.js Questions on StackOverflow
• React.js Discussion Board
• Flux Architecture for Building User Interfaces
• Enzyme — JavaScript Testing utilities for React
• Flow — A static type checker for JavaScript
• The Future of React
• Learn ES6, ES6 Features

Related Projects

• GraphQL Starter Kit — Boilerplate for building data APIs with Node.js, JavaScript (via Babel) and GraphQL
• Membership Database — SQL schema boilerplate for user accounts, profiles, roles, and auth claims
• Babel Starter Kit — Boilerplate for authoring JavaScript/React.js libraries

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• #react-starter-kit on Stack Overflow — Questions and answers
• #react-starter-kit on Gitter — Watch announcements, share ideas and feedback
• GitHub issues, or Scrum board — File issues, send feature requests
• appear.in/react — Open hours! Exchange ideas and experiences (React, GraphQL, startups and pet projects)
• @koistya on Codementor, or Skype — Private consulting

License

Copyright © 2014-present Kriasoft, LLC. This source code is licensed under the MIT license found in the LICENSE.txt file. The documentation to the project is licensed under the CC BY-SA 4.0 license.

---

Author: kriasoft
Source Code: https://github.com/kriasoft/react-starter-kit
License: MIT License

#graphql #react 

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