/
article_poster.go
197 lines (161 loc) · 3.53 KB
/
article_poster.go
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package article_service
import (
"image"
"image/draw"
"image/jpeg"
"io/ioutil"
"os"
"github.com/golang/freetype"
"github.com/ruixijiejie/go-gin-blog/pkg/file"
"github.com/ruixijiejie/go-gin-blog/pkg/qrcode"
"github.com/ruixijiejie/go-gin-blog/pkg/setting"
)
type ArticlePoster struct {
PosterName string
*Article
Qr *qrcode.QrCode
}
func NewArticlePoster(posterName string, article *Article, qr *qrcode.QrCode) *ArticlePoster {
return &ArticlePoster{
PosterName: posterName,
Article: article,
Qr: qr,
}
}
func GetPosterFlag() string {
return "poster"
}
func (a *ArticlePoster) CheckMergedImage(path string) bool {
if file.CheckNotExist(path+a.PosterName) == true {
return false
}
return true
}
func (a *ArticlePoster) OpenMergedImage(path string) (*os.File, error) {
f, err := file.MustOpen(a.PosterName, path)
if err != nil {
return nil, err
}
return f, nil
}
type ArticlePosterBg struct {
Name string
*ArticlePoster
*Rect
*Pt
}
type Rect struct {
Name string
X0 int
Y0 int
X1 int
Y1 int
}
type Pt struct {
X int
Y int
}
func NewArticlePosterBg(name string, ap *ArticlePoster, rect *Rect, pt *Pt) *ArticlePosterBg {
return &ArticlePosterBg{
Name: name,
ArticlePoster: ap,
Rect: rect,
Pt: pt,
}
}
type DrawText struct {
JPG draw.Image
Merged *os.File
Title string
X0 int
Y0 int
Size0 float64
SubTitle string
X1 int
Y1 int
Size1 float64
}
func (a *ArticlePosterBg) DrawPoster(d *DrawText, fontName string) error {
fontSource := setting.AppSetting.RuntimeRootPath + setting.AppSetting.FontSavePath + fontName
fontSourceBytes, err := ioutil.ReadFile(fontSource)
if err != nil {
return err
}
trueTypeFont, err := freetype.ParseFont(fontSourceBytes)
if err != nil {
return err
}
fc := freetype.NewContext()
fc.SetDPI(72)
fc.SetFont(trueTypeFont)
fc.SetFontSize(d.Size0)
fc.SetClip(d.JPG.Bounds())
fc.SetDst(d.JPG)
fc.SetSrc(image.Black)
pt := freetype.Pt(d.X0, d.Y0)
_, err = fc.DrawString(d.Title, pt)
if err != nil {
return err
}
fc.SetFontSize(d.Size1)
_, err = fc.DrawString(d.SubTitle, freetype.Pt(d.X1, d.Y1))
if err != nil {
return err
}
err = jpeg.Encode(d.Merged, d.JPG, nil)
if err != nil {
return err
}
return nil
}
func (a *ArticlePosterBg) Generate() (string, string, error) {
fullPath := qrcode.GetQrCodeFullPath()
fileName, path, err := a.Qr.Encode(fullPath)
if err != nil {
return "", "", err
}
if !a.CheckMergedImage(path) {
mergedF, err := a.OpenMergedImage(path)
if err != nil {
return "", "", err
}
defer mergedF.Close()
bgF, err := file.MustOpen(a.Name, path)
if err != nil {
return "", "", err
}
defer bgF.Close()
qrF, err := file.MustOpen(fileName, path)
if err != nil {
return "", "", err
}
defer qrF.Close()
bgImage, err := jpeg.Decode(bgF)
if err != nil {
return "", "", err
}
qrImage, err := jpeg.Decode(qrF)
if err != nil {
return "", "", err
}
jpg := image.NewRGBA(image.Rect(a.Rect.X0, a.Rect.Y0, a.Rect.X1, a.Rect.Y1))
draw.Draw(jpg, jpg.Bounds(), bgImage, bgImage.Bounds().Min, draw.Over)
draw.Draw(jpg, jpg.Bounds(), qrImage, qrImage.Bounds().Min.Sub(image.Pt(a.Pt.X, a.Pt.Y)), draw.Over)
err = a.DrawPoster(&DrawText{
JPG: jpg,
Merged: mergedF,
Title: "Golang Gin 系列文章",
X0: 80,
Y0: 160,
Size0: 42,
SubTitle: "---煎鱼",
X1: 320,
Y1: 220,
Size1: 36,
}, "msyhbd.ttc")
if err != nil {
return "", "", err
}
}
return fileName, path, nil
}