How to realize an intermediate view to crop a UIImage

Nos · 11-23-2011, 04:36 AM

I would like to realize an intermediate view that allow the user to define a specific area to crop an image.

I would like to realize it the same view as in the attached image.
The user can interact with 4 corners and define a square on the uiimage.

Is there any tutorial to realize it anywhere ?

Is there anyone can help me ?

Best regards,

Nos

Nos · 11-23-2011, 04:40 AM

It's better with the attached image :

**rocotilos** · 11-23-2011, 11:37 AM

This is way above my capability. But you might wanna search around for "Augmented Reality".

Nos · 11-23-2011, 01:41 PM

I just want to realize a view to select a specific area on uiimage to crop after, not use augmented reality

Nos · 12-01-2011, 08:31 AM

I found a solution by myself

Best regards

Duncan C · 12-01-2011, 09:25 AM

Quote:

Originally Posted by Nos

I found a solution by myself

Best regards

Cool. I'm glad you found a solution. Why not describe what you did for others to use?

Were you able to do the crop yourself? That's actually pretty easy.

dany_dev · 12-01-2011, 11:04 AM

however you can start from something like that

https://github.com/barrettj/BJImageCropper

Nos · 12-02-2011, 03:39 AM

The code given isn't perfect but it works.
To realize an intermediate view to select a zone in a UIImageView, i created a class named CanVasView as a subview of UIView that you can see in the attach file (the image of the 4 buttons must have a size of 60x60 pixels in HD mode).
To use it for example, you can declare a UIViewController with a UIImage, a UIImageView with a black background color and alpha to 0.5 and add as subview CanVasView with the same frame as the view of the UIViewController. To crop the UIImage, you must use the canVasFrame of the CanVasView and the function croppedImage of the UIImage+Resize class in the attach file. If you use the camera of the iPhone to take photo and initialize your UIImage of your UIImageView with the photo taken, don't forget to resize to the exactly size of your UIImageView before cropping because the photo given by the camera is HD.

Best regards,

lilly12346 · 01-02-2012, 06:30 AM

Can you please upload a sample project.
I don't get it started.