levinunnink / smooth-line-view

Smooth & fast line drawing from touch inputs for UIViews using Quartz

Smooth line UIView

The goal of this project is to create a UIView that can generate smooth lines from touch input in a reasonably fast manner without moving to a more complex framework like OpenGL.

Update: Completely re-written smooth line algorithm to use native CGContext quadratic curves. The result is much faster and smoother drawing. There's no more need for switching between agorithms.

Many thanks to Ginamin for his elegant solution.

The Smooth Line View code is licensed under the MIT License: http://opensource.org/licenses/MIT

smooth-line-view's Issues

how the fuck are we suppose to use your project if you have manually added your provisioning profile?

i can't use your project because you manually added a profile, which i can't remove.

Added some function

https://github.com/yusenhan/Smooth-Line-View
I add some function:

1. undo
2. redo
3. clear
4. eraser
5. change color
6. save image to file
7. save image to album

Crashing on iOS 12

Hello there,

The Smooth-Line-View is crashing in iOS 12. Works fine with older version.

Please help.

I have attach the crash screenshot from Xcode.

Thanks.

Missing Spline files

I can see that you have added a folder "spline" in the framework, however, it doesn't come with the project so it cannot be run.

Make background color clearcolor of director controller

I have document and want to use this code to make annotations on it. So I want to see my controller in background and have director controller on it. So that user feel that line is drawn on the document.

Thanks in advance

Changing colour/width affects previous paths

This is a really great project and performs very well even on Retina iPad displays.

If you change the lineColor or lineWidth property and then attempt to draw another line, any previous paths that fall within the rectangle drawn in drawRect are updated to the new colour/width.

This makes sense since all drawn paths are added to the single mutable path but it's not ideal. I've been wondering about saving existing paths in onTouchesEnded but I'm not sure what is best to save to - UIImage, a sub-view or maybe a CGLayer.

Memory Warning

When I try to run this app in iPad (1st gen), it will receive memory warning if I draw a lot of lines. After a few more lines are drawn, the app will crash.

Tap once to create a smooth dot [feature req]

Title says it all

Drawing line is not solid

How to clean up the path?

if a stroke removed by clearColor or kcgblendmodeclear, the stroke will be respawned if another stroke touch the path. How should this be handled?

Lags noticeably on Retina (iPad)

I watched WWDC '12 session #506 and already made sure that

• UIKit set the appropriate scale factor (2.0 on Retina [iPad])
• We use UIGraphicsBeginImageContextWithOptions to draw to bitmap contexts
• We use opaque drawing because it is much faster
• We "never draw more than we actually need to" (We use setNeedsDisplayInRect: )
• We do not redraw the entire CGPath, instead it is flatten to a bitmap
• static content is placed into separate UIView

Code still lags noticeably in performance on Retina (iPad).