adapt

Documentation

Index

• func Thumbnail(pc *types.Postcard, maxWidth, maxHeight int) (image.Image, error)
• func ThumbnailFile(path string, maxWidth, maxHeight int) (image.Image, error)

Examples

• ThumbnailFile

Functions

func Thumbnail

func Thumbnail(pc *types.Postcard, maxWidth, maxHeight int) (image.Image, error)

Thumbnail generates a thumbnail image representing this postcard's front. Providing a maximum width or height of zero will allow the thumbnail to grow up to the postcard's original size in that dimension.

func ThumbnailFile

func ThumbnailFile(path string, maxWidth, maxHeight int) (image.Image, error)

ThumbnailFile is a convenience method for retrieving a thumbnail directly on a file using Thumbnail.

Example

package main

import (
	"bytes"
	"crypto/md5"
	"fmt"
	"image/png"

	"github.com/dotpostcard/postcards-go/adapt"
)

func main() {
	thumb, err := adapt.ThumbnailFile("../fixtures/hello.postcard", 128, 0)
	if err != nil {
		panic(err)
	}

	buf := new(bytes.Buffer)
	if err := png.Encode(buf, thumb); err != nil {
		panic(err)
	}

	fmt.Printf("Thumbnail PNG (%dx%d) has checksum %x",
		thumb.Bounds().Dx(), thumb.Bounds().Dy(), md5.Sum(buf.Bytes()))
}

Output:

Thumbnail PNG (128x157) has checksum eba1acbde60137aff808c9783c05706d