class Vips::Angle45
Various fixed 45 degree rotation angles. See {Image#rot45}.
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`:d0` no rotate
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`:d45` 45 degrees clockwise
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`:d90` 90 degrees clockwise
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`:d135` 135 degrees clockwise
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`:d180` 180 degrees
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`:d225` 135 degrees anti-clockwise
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`:d270` 90 degrees anti-clockwise
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`:d315` 45 degrees anti-clockwise