mirror of
https://github.com/celogeek/go-comic-converter.git
synced 2025-05-25 00:02:37 +02:00
121 lines
2.9 KiB
Go
121 lines
2.9 KiB
Go
// Package epubimage Image helpers to transform image.
|
|
package epubimage
|
|
|
|
import (
|
|
"fmt"
|
|
"image"
|
|
"strings"
|
|
)
|
|
|
|
type Image struct {
|
|
Id int
|
|
Part int
|
|
Raw image.Image
|
|
Width int
|
|
Height int
|
|
IsBlank bool
|
|
DoublePage bool
|
|
Path string
|
|
Name string
|
|
Position string
|
|
Format string
|
|
OriginalAspectRatio float64
|
|
Error error
|
|
}
|
|
|
|
// SpaceKey key name of the blank page after the image
|
|
func (i Image) SpaceKey() string {
|
|
return fmt.Sprintf("space_%d", i.Id)
|
|
}
|
|
|
|
// SpacePath path of the blank page
|
|
func (i Image) SpacePath() string {
|
|
return fmt.Sprintf("Text/%s.xhtml", i.SpaceKey())
|
|
}
|
|
|
|
// EPUBSpacePath path of the blank page into the EPUB
|
|
func (i Image) EPUBSpacePath() string {
|
|
return fmt.Sprintf("OEBPS/%s", i.SpacePath())
|
|
}
|
|
|
|
// PageKey key for page
|
|
func (i Image) PageKey() string {
|
|
return fmt.Sprintf("page_%d_p%d", i.Id, i.Part)
|
|
}
|
|
|
|
// PagePath page path linked to the image
|
|
func (i Image) PagePath() string {
|
|
return fmt.Sprintf("Text/%s.xhtml", i.PageKey())
|
|
}
|
|
|
|
// EPUBPagePath page path into the EPUB
|
|
func (i Image) EPUBPagePath() string {
|
|
return fmt.Sprintf("OEBPS/%s", i.PagePath())
|
|
}
|
|
|
|
// ImgKey key for image
|
|
func (i Image) ImgKey() string {
|
|
return fmt.Sprintf("img_%d_p%d", i.Id, i.Part)
|
|
}
|
|
|
|
// ImgPath image path
|
|
func (i Image) ImgPath() string {
|
|
return fmt.Sprintf("Images/%s.%s", i.ImgKey(), i.Format)
|
|
}
|
|
|
|
// EPUBImgPath image path into the EPUB
|
|
func (i Image) EPUBImgPath() string {
|
|
return fmt.Sprintf("OEBPS/%s", i.ImgPath())
|
|
}
|
|
|
|
// ImgStyle style to apply to the image.
|
|
//
|
|
// center by default.
|
|
// align to left or right if it's part of the split double page.
|
|
func (i Image) ImgStyle(viewWidth, viewHeight int, align string) string {
|
|
relWidth, relHeight := i.RelSize(viewWidth, viewHeight)
|
|
marginW, marginH := float64(viewWidth-relWidth)/2, float64(viewHeight-relHeight)/2
|
|
|
|
var style []string
|
|
|
|
style = append(style, fmt.Sprintf("width:%dpx", relWidth))
|
|
style = append(style, fmt.Sprintf("height:%dpx", relHeight))
|
|
style = append(style, fmt.Sprintf("top:%.2f%%", marginH*100/float64(viewHeight)))
|
|
if align == "" {
|
|
switch i.Position {
|
|
case "rendition:page-spread-left":
|
|
style = append(style, "right:0")
|
|
case "rendition:page-spread-right":
|
|
style = append(style, "left:0")
|
|
default:
|
|
style = append(style, fmt.Sprintf("left:%.2f%%", marginW*100/float64(viewWidth)))
|
|
}
|
|
} else {
|
|
style = append(style, align)
|
|
}
|
|
|
|
return strings.Join(style, "; ")
|
|
}
|
|
|
|
func (i Image) RelSize(viewWidth, viewHeight int) (relWidth, relHeight int) {
|
|
w, h := viewWidth, viewHeight
|
|
srcw, srch := i.Width, i.Height
|
|
|
|
if w <= 0 || h <= 0 || srcw <= 0 || srch <= 0 {
|
|
return
|
|
}
|
|
|
|
wratio := float64(srcw) / float64(w)
|
|
hratio := float64(srch) / float64(h)
|
|
|
|
if wratio > hratio {
|
|
relWidth = w
|
|
relHeight = int(float64(srch)/wratio + 0.5)
|
|
} else {
|
|
relHeight = h
|
|
relWidth = int(float64(srcw)/hratio + 0.5)
|
|
}
|
|
|
|
return
|
|
}
|