A Fast and Complete Swift Drawing Library

Related tags

Image FastDraw
Overview

FastDraw

A Fast and Complete Swift Drawing Library

Description

FastDraw is a high performance and highly extensible Drawing Library that supports Apple Pencil. It supports pencil, highlighter, eraser, and lasso. It is the drawing library used in the collaborative drawing app CoCreate. It has been optimized for Apple Pencil, which means that the stroke you draw with this library detects force performed on the drawing. You can directly get access to the SQLite file created by the library. Moreover, it also provides interface to get updates on operation happens on the board, so it is possible to send the operation in the format of protobuff to other users. There is also interface to draw on the board programatically, which means you can even listen to a websocket, receive a drawing, erasing, or even lasso operation from others, and perform that on the board. FastDraw gives developer the full control over drawing.

Getting Started

Try out the FastDrawDemo

Installing

pod 'FastDraw', :git => 'https://github.com/collinzrj/FastDraw.git', :commit => "33ed685f73b8adae8ab1ca26e5f028f8ef1cd406"

Help

Create an issue if you meet any problems

Authors

Collin Zhang

License

This project is licensed under the [MIT] License - see the LICENSE.md file for details

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Comments
  • lag when redrawing >300 strokes.

    lag when redrawing >300 strokes.

    Hi, first and foremost I love your project.

    I faced an issue where the drawboard becomes laggy when it has to render more than 300 strokes. At 1900 strokes, The drawboard is basically lagging one stroke behind, stroke data such as stroke points and width are not fully captured as well.

    I found the culprit to be self.setNeedsDisplay(). It will redraw the whole canvas after each stroke, which after 1900 strokes, it would take 1 seconds to complete the repaint, which is unusable for handwriting.

    Few ideas on top of my mind:

    • Limit the redraw scope to the area of the new stroke.
    • Draw to CALayers
    • Caching?

    Thanks!

    opened by 8gb 6
Releases(v0.1.0-alpha)

  • v0.1.0-alpha(Oct 25, 2021)

    FastDraw is a high performance and highly extensible Drawing Library that supports Apple Pencil. It supports pencil, highlighter, eraser, and lasso.

    Source code(tar.gz)
    Source code(zip)
Owner
Collin Zhang
NFLS | NYU STERN | IOS Developer
Collin Zhang
GitHub
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