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george-lim committed Feb 16, 2021
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21 changes: 21 additions & 0 deletions LICENSE
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MIT License

Copyright (c) 2018 George Lim

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
22 changes: 22 additions & 0 deletions README.md
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SpriteKit Smooth Sketch
<br>
![GitHub downloads](https://img.shields.io/github/downloads/george-lim/smooth-sketch/total.svg)
[![GitHub release](https://img.shields.io/github/release/george-lim/smooth-sketch.svg)](https://github.com/george-lim/smooth-sketch/releases)
[![GitHub issues](https://img.shields.io/github/issues/george-lim/smooth-sketch.svg)](https://github.com/george-lim/smooth-sketch/issues)
[![GitHub pull requests](https://img.shields.io/github/issues-pr/george-lim/smooth-sketch.svg)](https://github.com/george-lim/smooth-sketch/pulls)
[![license](https://img.shields.io/github/license/george-lim/smooth-sketch.svg)](https://github.com/george-lim/smooth-sketch/blob/master/LICENSE)
===============

This project minimizes lag with free hand drawing SpriteKit apps by optimizing to decrease the number of nodes that are drawn on the screen from finger movement and eliminating the use of SKShapeNodes to output the lines. It uses bezier curves to calculate the movement of your sketch lines to produce the streaks that follow your finger.

1. [Inspiration](#inspiration)
1. [Demo](#demo)

# Inspiration

Freehand drawing is surprisingly difficult to implement properly on SpriteKit. That's because SKShapeNode is currently plagued with memory leaking bugs, meaning your overall game performance will degrade exponentially as the user continues drawing, until their device inevitably crashes.

I came across this issue when developing my [Traffic Pal](https://itunes.apple.com/ca/app/traffic-pal/id1265505042?mt=8) app for iOS, which required free hand drawing. After developing this framework to maximize freehand drawing performance in my app, I decided to open source my work so that nobody has to spend countless hours researching and optimizing freehand drawing anymore.

# Demo
![Demo](demo.gif)
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7 changes: 7 additions & 0 deletions sketch.xcodeproj/project.xcworkspace/contents.xcworkspacedata

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5 changes: 5 additions & 0 deletions sketch.xcodeproj/xcuserdata/George.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist
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