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normalize rotate values

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A -90 or 630 degree rotation is the same as 270.
This commit is contained in:
Will Norris 2017-09-06 21:06:52 +00:00
parent 76c8498abe
commit 07c54b46e3
2 changed files with 5 additions and 1 deletions
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3
transform.go
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@ -208,7 +208,8 @@ func transformImage(m image.Image, opt Options) image.Image {
} }
// rotate // rotate
switch opt.Rotate { rotate := float64(opt.Rotate) - math.Floor(float64(opt.Rotate)/360)*360
switch rotate {
case 90: case 90:
m = imaging.Rotate90(m) m = imaging.Rotate90(m)
case 180: case 180:

3
transform_test.go
View file

@ -165,9 +165,12 @@ func TestTransformImage(t *testing.T) {
// rotations // rotations
{ref, Options{Rotate: 45}, ref}, // invalid rotation is a noop {ref, Options{Rotate: 45}, ref}, // invalid rotation is a noop
{ref, Options{Rotate: 360}, ref},
{ref, Options{Rotate: 90}, newImage(2, 2, green, yellow, red, blue)}, {ref, Options{Rotate: 90}, newImage(2, 2, green, yellow, red, blue)},
{ref, Options{Rotate: 180}, newImage(2, 2, yellow, blue, green, red)}, {ref, Options{Rotate: 180}, newImage(2, 2, yellow, blue, green, red)},
{ref, Options{Rotate: 270}, newImage(2, 2, blue, red, yellow, green)}, {ref, Options{Rotate: 270}, newImage(2, 2, blue, red, yellow, green)},
{ref, Options{Rotate: 630}, newImage(2, 2, blue, red, yellow, green)},
{ref, Options{Rotate: -90}, newImage(2, 2, blue, red, yellow, green)},
// flips // flips
{ {