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banner.go
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banner.go
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package generator
import (
"image"
"image/color"
"image/draw"
"image/gif"
"image/jpeg"
"image/png"
"os"
"strings"
"github.com/fogleman/gg"
"github.com/pkg/errors"
"github.com/kodekoding/phastos/go/helper"
"github.com/kodekoding/phastos/go/log"
)
type (
Banners interface {
AddImageLayer(img *ImageLayer) Banners
AddLabel(labelText *Label) Banners
Generate() Banners
Image() image.Image
Save(destPath string) error
}
Options func(*Banner)
Banner struct {
imgLayer []*ImageLayer
label []*Label
BgProperty
img image.Image
}
//ImageLayer is a struct
ImageLayer struct {
Image image.Image
XPos int
YPos int
}
//Label is a struct
Label struct {
Text string
FontPath string
FontType string
Size float64
Color color.Color
DPI float64
Spacing float64
XPos int
YPos int
RightMargin float64
}
//BgProperty is background property struct
BgProperty struct {
Width int
Height int
BgColor color.Color
}
)
// NewBanner - by default will be w: 1200, h: 400, bgColor: white
func NewBanner(opts ...Options) *Banner {
defaultBgColor, _ := helper.ParseHexColor("#fff")
bannerObj := &Banner{
BgProperty: BgProperty{
Width: 1200,
Height: 400,
BgColor: defaultBgColor,
},
}
for _, opt := range opts {
opt(bannerObj)
}
return bannerObj
}
func WithWidth(width int) Options {
return func(banner *Banner) {
banner.Width = width
}
}
func WithHeight(height int) Options {
return func(banner *Banner) {
banner.Height = height
}
}
func WithBackgroudColor(hexColor string) Options {
return func(banner *Banner) {
rgba, err := helper.ParseHexColor(hexColor)
if err != nil {
log.Errorln("got error when parse hex string: ", err.Error())
}
banner.BgColor = rgba
}
}
func (b *Banner) AddImageLayer(img *ImageLayer) Banners {
b.imgLayer = append(b.imgLayer, img)
return b
}
func (b *Banner) AddLabel(labelText *Label) Banners {
b.label = append(b.label, labelText)
return b
}
func (b *Banner) Image() image.Image {
return b.img
}
func (b *Banner) Generate() Banners {
//create image's background
dc := gg.NewContext(b.Width, b.Height)
bgImg := image.NewRGBA(image.Rect(0, 0, b.Width, b.Height))
//set the background color
draw.Draw(bgImg, bgImg.Bounds(), &image.Uniform{b.BgColor}, image.Point{}, draw.Src)
dc.DrawImage(bgImg, 0, 0)
//looping image layer, higher array index = upper layer
for _, img := range b.imgLayer {
dc.DrawImage(img.Image, img.XPos, img.YPos)
}
for _, label := range b.label {
if err := dc.LoadFontFace(label.FontPath, label.Size); err != nil {
log.Errorln("got error when load font face: ", err.Error())
return nil
}
x := float64(label.XPos)
y := float64(label.YPos)
maxWidth := float64(dc.Width()) - label.RightMargin - label.RightMargin
dc.DrawStringWrapped(label.Text, x+1, y+1, 0, 0, maxWidth, label.Spacing, gg.AlignLeft)
dc.SetColor(label.Color)
dc.DrawStringWrapped(label.Text, x, y, 0, 0, maxWidth, label.Spacing, gg.AlignLeft)
}
b.img = dc.Image()
return b
}
func (b *Banner) Save(destPath string) error {
newFile, err := os.Create(destPath)
if err != nil {
return errors.Wrap(err, "phastos.go.generator.banner.Generate.CreateNewFile")
}
defer newFile.Close()
splitSavePath := strings.Split(destPath, ".")
saveFileExt := splitSavePath[len(splitSavePath)-1]
switch saveFileExt {
case "png":
if err = png.Encode(newFile, b.img); err != nil {
return errors.Wrap(err, "phastos.go.generator.banner.Generate.EncodeToPNG")
}
case "jpg", "jpeg":
var opt jpeg.Options
opt.Quality = 80
if err = jpeg.Encode(newFile, b.img, &opt); err != nil {
return errors.Wrap(err, "phastos.go.generator.banner.Generate.EncodeToJPEG")
}
case "gif":
var opt gif.Options
if err = gif.Encode(newFile, b.img, &opt); err != nil {
return errors.Wrap(err, "phastos.go.generator.banner.Generate.EncodeToGif")
}
default:
return errors.Wrap(errors.New("file extensions isn't support yet"), "phastos.go.generator.banner.Generate.NewFileExtensionCheck")
}
return nil
}