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allow crop options to be floats and negative

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values between 0 and 1 have the same behavior as the size option - it is
treated as a percentage of the original image size.  Negative values for
cx and cy are calculated from the bottom and right edges of the image.
This commit is contained in:
Will Norris 2017-08-31 07:27:35 +00:00
parent 430baac0b0
commit 4533f0c68a
4 changed files with 71 additions and 50 deletions
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9
README.md
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@ -23,10 +23,10 @@ imageproxy URLs are of the form `http://localhost/{options}/{remote_url}`.
### Options ###
Options are available for resizing, rotation, flipping, and digital signatures
among a few others. Options for are specified as a comma delimited list of
parameters, which can be supplied in any order. Duplicate parameters overwrite
previous values.
Options are available for cropping, resizing, rotation, flipping, and digital
signatures among a few others. Options for are specified as a comma delimited
list of parameters, which can be supplied in any order. Duplicate parameters
overwrite previous values.
See the full list of available options at
<https://godoc.org/willnorris.com/go/imageproxy#ParseOptions>.
@ -60,6 +60,7 @@ x0.15 | 15% original height, proportional width | <a href="https://willnorris
100,fv,fh | 100px square, flipped horizontal and vertical | <a href="https://willnorris.com/api/imageproxy/100,fv,fh/https://willnorris.com/2013/12/small-things.jpg"><img src="https://willnorris.com/api/imageproxy/100,fv,fh/https://willnorris.com/2013/12/small-things.jpg" alt="100,fv,fh"></a>
200x,q60 | 200px wide, proportional height, 60% quality | <a href="https://willnorris.com/api/imageproxy/200x,q60/https://willnorris.com/2013/12/small-things.jpg"><img src="https://willnorris.com/api/imageproxy/200x,q60/https://willnorris.com/2013/12/small-things.jpg" alt="200x,q60"></a>
200x,png | 200px wide, converted to PNG format | <a href="https://willnorris.com/api/imageproxy/200x,png/https://willnorris.com/2013/12/small-things.jpg"><img src="https://willnorris.com/api/imageproxy/200x,png/https://willnorris.com/2013/12/small-things.jpg" alt="200x,png"></a>
cx175,cw400,ch300,100x | crop to 400x300px starting at (175,0), scale to 100px wide | <a href="https://willnorris.com/api/imageproxy/cx175,cw400,ch300,100x/https://willnorris.com/2013/12/small-things.jpg"><img src="https://willnorris.com/api/imageproxy/cx175,cw400,ch300,100x/https://willnorris.com/2013/12/small-things.jpg" alt="cx175,cw400,ch300,100x"></a>
Transformation also works on animated gifs. Here is [this source
image][material-animation] resized to 200px square and rotated 270 degrees: