https://github.com/nikolairuhe/layerperformance

https://github.com/nikolairuhe/layerperformance

Last synced: 2 months ago
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• Host: GitHub
• URL: https://github.com/nikolairuhe/layerperformance
• Owner: NikolaiRuhe
• Created: 2011-05-03T08:17:04.000Z (over 13 years ago)
• Default Branch: master
• Last Pushed: 2013-01-29T08:42:24.000Z (almost 12 years ago)
• Last Synced: 2023-03-11T22:41:50.812Z (almost 2 years ago)
• Language: Objective-C
• Homepage:
• Size: 105 KB
• Stars: 13
• Watchers: 3
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.markdown

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README

        
LayerPerformance

================

This project illustrates the ideas presented in [this stackoverflow post](http://stackoverflow.com/questions/5847876/whats-the-best-approach-to-draw-lines-between-views/5848118#5848118).

It is a simple iPad app intended to measure the difference between Core Graphics rendering and Core Animation (layer based) rendering. The app shows a number of draggable dots, connected by lines. When a dot is moved, the connected lines are updated to follow the dot. There are two implementations with vastly different performance and memory consumption: Core Graphics and Core Animation.

![screenshot and instruments results](http://i.stack.imgur.com/vqNwO.png)

### Core Graphics

Core Graphics is used to create the lines. The layer is extended to the bounding

box of the line. The contents are drawn using Core Graphics functions.

### Core Animation

The layer is filled with the line color and resized, positioned and rotated to

exactly cover the area of the line. No CPU based redraw is needed for this drawing

mode.

As expected, the performance of Core Animation based drawing is drastically better

than for Core Graphics based drawing. Also, the memory footprint is considerably

lower.