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How to make an image responsive in Go using rethumb?
The following code prints HTML with responsive images support. It's ready to use and defines three levels of resolution: 400px, 800px and original image.
Adapt and start using the following code in Go (we use Picturefill as polyfill):
package main
import "fmt"
func main() {
imageUrl := "http://images.rethumb.com/image_coimbra_999x999.jpg"
small_width := "400" // Image width for small resolutions (less than 400px).
large_width := "800" // Image width for medium resolutions (less than 800px).
image_width := "999" // Image original width (used for resolutions larger than 800px).
fmt.Println(
"<script src=\"https://cdnjs.cloudflare.com/ajax/libs/picturefill/2.3.1/picturefill.min.js\"></script>\n"+
"\n"+
"<img src=\"http://api.rethumb.com/v1/width/"+small_width+"/"+imageUrl+"\"\n"+
"\n"+
" srcset=\"http://api.rethumb.com/v1/width/"+small_width+"/"+imageUrl+" "+small_width+"w,\n"+
" http://api.rethumb.com/v1/width/"+large_width+"/"+imageUrl+" "+large_width+"w,\n"+
" "+imageUrl+" "+image_width+"w\"\n"+
"\n"+
" sizes=\"100vw\" />")
}
Start using this example now
Use the following commands to get started:
$ git clone https://github.com/rethumb/rethumb-go-examples.git
$ cd rethumb-go-examples
$ go build responsive-images.go
$ ./responsive-images
More examples using Go
How to use rethumb in Go?
How to resize an image by width in Go using rethumb?
How to resize an image by height in Go using rethumb?
How to resize an image by width and height in Go using rethumb?
How to create a square thumbnail from an image in Go using rethumb?
How to read Exif data in json format from an image in Go using rethumb?
How to make an image responsive in Go using rethumb?
How to read GPS coordinates from an image in Go using rethumb?
How to convert an image to JPG, GIF, PNG, TIF or WebP in Go using rethumb?
How to resize an image to cover any dimensions in Go using rethumb?