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Am developing jigsaw puzzle for iphone.
Here using the masking technique I have cropped the image into 9 peices. See the image below.
After cropping some portion of image is missing due to masking. I knew this is coz of loading those cropped images in square uiimageview.
My question is how to make it as complete cropped image without losing any portion of image and how to fit these pieces correctly to match with original one.
Build a set of masks corresponding to to each puzzle piece. Each mask should be the size of the original image and all black except for a white area with the position and shape of the puzzle piece. Also, maintain a bounding rectangle for each piece (a rectangle that minimally contains the piece in the mask image).
The way to not lose any of the original image is to arrange the masks (and the corresponding bounding rects) as a partition over the image.
Here’s a link to some code that demonstrates how to apply a mask. Once the mask is applied, crop the masked image to the bounding rectangle using code like here and elsewhere.