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iPhone painting app undo/redo implementation

I'm upgrading an iPhone application which is based on Apple's Open GL sample application, GLPaint.

I need to implement undo/redo functionality to my app, but I'm totally new to OpenGL.

I would like you to implement sample undo/redo function added on top of the GLPaint sample app, to help me how to do the job.

- Undo means to cancel the last stroke. Multi-level undo is nice. Erasing the whole screen is not an undo.

- Redo is the opposite, to replay strokes.

Modified sample app is hopefully able to:

- run on iOS3 or later.

- draw almost as quick as the original sample app.

- undo one level or more. Redo is not a must.

- No need to be the fastest in the world, but faster is better.

- leaks no memory. no errors, no warnings.

- more comments is better.

Please use Objective-C or C to write the code. I have 6 months experience Objective-C programming, released 3 apps so far, but I cannot call myself an expert. So please write not too much advanced/complicated code.

Skills: iPhone, Mobile App Development, Objective C

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About the Employer:
( 1 review ) Sapporo, Japan

Project ID: #1119091

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maverick26

Please check PM for details.

$150 USD in 3 days
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5 freelancers are bidding on average $179 for this job

MobileTeamVN

Hi. I'm interested in your project. Please check PM.

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meandrain

Dear sir, Please check PMB, regards.

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gothelp

Very experienced in this category. Let me do it for you.

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culmisoft1

hi,kindly check the pm for details.

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