forked from mattermost/mattermost
/
rotate.go
35 lines (29 loc) · 826 Bytes
/
rotate.go
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// Copyright 2011 The Graphics-Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package graphics
import (
"code.google.com/p/graphics-go/graphics/interp"
"errors"
"image"
"image/draw"
)
// RotateOptions are the rotation parameters.
// Angle is the angle, in radians, to rotate the image clockwise.
type RotateOptions struct {
Angle float64
}
// Rotate produces a rotated version of src, drawn onto dst.
func Rotate(dst draw.Image, src image.Image, opt *RotateOptions) error {
if dst == nil {
return errors.New("graphics: dst is nil")
}
if src == nil {
return errors.New("graphics: src is nil")
}
angle := 0.0
if opt != nil {
angle = opt.Angle
}
return I.Rotate(angle).TransformCenter(dst, src, interp.Bilinear)
}