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allow percentage sizes

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change height and width options to be floats, and interpret values
between 0 and 1 to be percentages.  For example, an options strings of
"0.5x" specifies 50% width and proportional height.
This commit is contained in:
Will Norris 2013-12-06 15:03:17 -08:00
parent 036d0c51c4
commit cd1112f7ac
4 changed files with 28 additions and 12 deletions
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18
transform/transform.go
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@ -35,14 +35,26 @@ func Transform(img data.Image, opt *data.Options) (*data.Image, error) {
return nil, err
}
var h, w int
if opt.Width > 0 && opt.Width < 1 {
w = int(float64(m.Bounds().Max.X-m.Bounds().Min.X) * opt.Width)
} else {
w = int(opt.Width)
}
if opt.Height > 0 && opt.Height < 1 {
h = int(float64(m.Bounds().Max.Y-m.Bounds().Min.Y) * opt.Height)
} else {
h = int(opt.Height)
}
// resize
if opt.Fit {
m = imaging.Fit(m, opt.Width, opt.Height, imaging.Lanczos)
m = imaging.Fit(m, w, h, imaging.Lanczos)
} else {
if opt.Width == 0 || opt.Height == 0 {
m = imaging.Resize(m, opt.Width, opt.Height, imaging.Lanczos)
m = imaging.Resize(m, w, h, imaging.Lanczos)
} else {
m = imaging.Thumbnail(m, opt.Width, opt.Height, imaging.Lanczos)
m = imaging.Thumbnail(m, w, h, imaging.Lanczos)
}
}