You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
35 lines
826 B
35 lines
826 B
// 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) |
|
}
|
|
|