Some time ago want to do a picture station, on the phone took a lot of photos, but to use PS to compress the size of the change is too much trouble. Finally thought of using Golang to achieve, is to learn while practicing it. It uses Github.com/nfnt/resize, the third-party library, to support only JPG image formats.
Copy Code code as follows:
Package Main
Import (
"FMT"
"Github.com/nfnt/resize"
"Image"
"Image/draw"
"Image/jpeg"
"Image/png"
"Io/ioutil"
"Log"
"Math/rand"
"OS"
"Runtime"
"StrConv"
"Strings"
"Time"
)
Func Main () {
Runtime. Gomaxprocs (runtime. NUMCPU ())
CMD ("data/")
Fmt. Println ("ok!")
}
Perform an action
Func cmd (path string) {
Files, _: = Ioutil. ReadDir (PATH)
For _, File: = Range Files {
If file. Isdir () {
Fmt. Println ("directory" + file. Name ())
CMD (path + file). Name () + "/")
} else {
If strings. Contains (Strings. ToLower (file. Name ()), ". jpg" {
Random Name
To: = Path + random_name () + ". jpg"
Origin: = path + file. Name ()
Fmt. PRINTLN ("processing" + Origin + ">>>" + to)
Cmd_resize (origin, 2048, 0, to)
Defer OS. Remove (Origin)
}
}
}
}
Change size
Func cmd_resize (file string, width uint, height uint, to string) {
Open the picture and decode it
File_origin, _: = OS. Open (file)
Origin, _: = JPEG. Decode (File_origin)
Defer File_origin. Close ()
Canvas: = resize. Resize (width, height, origin, Resize.) LANCZOS3)
File_out, err: = OS. Create (To)
If Err!= nil {
Log. Fatal (ERR)
}
Defer file_out. Close ()
Jpeg. Encode (file_out, canvas, &jpeg. OPTIONS{80})
Cmd_watermark (To, strings. Replace (To, ". jpg", "@big. jpg", 1))
Cmd_thumbnail (To, 360, strings. Replace (To, ". jpg", "@small. jpg", 1))
}
Func cmd_thumbnail (file string, width uint, height uint, to string) {
Open the picture and decode it
File_origin, _: = OS. Open (file)
Origin, _: = JPEG. Decode (File_origin)
Defer File_origin. Close ()
Canvas: = resize. Thumbnail (width, height, origin, resize.) LANCZOS3)
File_out, err: = OS. Create (To)
If Err!= nil {
Log. Fatal (ERR)
}
Defer file_out. Close ()
Jpeg. Encode (file_out, canvas, &jpeg. OPTIONS{80})
}
Watermarking
Func Cmd_watermark (file string, to String) {
Open the picture and decode it
File_origin, _: = OS. Open (file)
Origin, _: = JPEG. Decode (File_origin)
Defer File_origin. Close ()
Open a watermark map and decode it
File_watermark, _: = OS. Open ("Watermark.png")
Watermark, _: = png. Decode (File_watermark)
Defer File_watermark. Close ()
Original chart boundary
Origin_size: = Origin. Bounds ()
Create a new layer
Canvas: = image. Newnrgba (Origin_size)
Paste Original Map
Draw. Draw (Canvas, Origin_size, origin, image. ZP, Draw. SRC)
Paste a watermark Map
Draw. Draw (canvas, Watermark. Bounds (). ADD (image. Pt (), watermark, image. ZP, Draw. Over)
Generate a new picture
Create_image, _: = OS. Create (To)
Jpeg. Encode (Create_image, canvas, &jpeg. OPTIONS{95})
Defer create_image. Close ()
}
Randomly generated file name
Func random_name () string {
Rand. Seed (time. Now (). Unixnano ())
Return StrConv. Itoa (Rand. Int ())
}
The above is the full content of this article, I hope to be able to master the Go language help.
