func (img *Image) Resize(width int, height int) {
wand := img.wand
cur_width := float64(C.MagickGetImageWidth(wand))
cur_height := float64(C.MagickGetImageHeight(wand))
r_width := cur_width / float64(width)
r_height := cur_height / float64(height)
ratio := r_height
if r_width < r_height {
ratio = r_width
}
dest_width := cur_width / ratio
dest_height := cur_height / ratio
crop_x := int((dest_width - float64(width)) / 2)
crop_y := int((dest_height - float64(height)) / 2)
if r_width > 5 && r_height > 5 {
C.MagickSampleImage(wand, C.size_t(dest_width*5), C.size_t(dest_height*5))
}
C.MagickResizeImage(wand, C.size_t(dest_width), C.size_t(dest_height), C.LanczosFilter, 1)
C.MagickCropImage(wand, C.size_t(width), C.size_t(height), C.ssize_t(crop_x), C.ssize_t(crop_y))
}
// Changes the size of the canvas using specified filter and blur, returns true on success.
func (self *Canvas) ResizeWithFilter(width uint, height uint, filter uint, blur float32) error {
if width == 0 && height == 0 {
return errors.New("Please specify at least one of dimensions")
}
if width == 0 || height == 0 {
origHeight := uint(C.MagickGetImageHeight(self.wand))
origWidth := uint(C.MagickGetImageWidth(self.wand))
if width == 0 {
ratio := float32(origHeight) / float32(height)
width = uint(float32(origWidth) / ratio)
}
if height == 0 {
ratio := float32(origWidth) / float32(width)
height = uint(float32(origHeight) / ratio)
}
}
success := C.MagickResizeImage(self.wand, C.size_t(width), C.size_t(height), C.FilterTypes(filter), C.double(blur))
if success == C.MagickFalse {
return fmt.Errorf("Could not resize: %s", self.Error())
}
return nil
}
/*
Returns the image height
*/
func (this *Image) GetHeight() (int64, error) {
if this.magickWand == nil {
return 0, errors.New("error get image height:magickwand is nil")
}
height, err := C.MagickGetImageHeight(this.magickWand)
return int64(height), err
}
/*
Returns the image height
*/
func (this *Image) GetHeight() (int64, error) {
var err error = nil
tran := this.Cat.NewTransaction("GraphicsMagickCmd", "GetHeight")
defer func() {
tran.SetStatus(err)
tran.Complete()
}()
if this.magickWand == nil {
err = errors.New("error get image height:magickwand is nil")
return 0, err
}
height, err := C.MagickGetImageHeight(this.magickWand)
return int64(height), err
}
// Returns canvas' height.
func (cv Canvas) Height() uint {
return uint(C.MagickGetImageHeight(cv.wand))
}
// Returns canvas' height.
func (self *Canvas) Height() uint {
return uint(C.MagickGetImageHeight(self.wand))
}
/* Gets the image height. */
func (w *MagickWand) ImageHeight() uint {
return uint(C.MagickGetImageHeight(w.wand))
}
// Public: get current height of the image
//
// Examples:
// im = NewMage()
// original, err := ioutil.ReadFile("test.jpg")
// im.Height()
func (m *Mage) Height() int {
return int(C.MagickGetImageHeight(m.wand))
}