mirror of
https://github.com/celogeek/go-comic-converter.git
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8ba9092d9c
In order to let third parties use the package of this library, we moved the pkg folder out of the locked internal folder
126 lines
3.1 KiB
Go
126 lines
3.1 KiB
Go
// Package epubimage EPUBImage helpers to transform image.
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package epubimage
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import (
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"image"
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"strings"
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"github.com/celogeek/go-comic-converter/v2/pkg/utils"
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)
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type EPUBImage struct {
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Id int
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Part int
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Raw image.Image
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Width int
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Height int
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IsBlank bool
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DoublePage bool
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Path string
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Name string
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Position string
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Format string
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OriginalAspectRatio float64
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Error error
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}
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// SpaceKey key name of the blank page after the image
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func (i EPUBImage) SpaceKey() string {
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return "space_" + utils.IntToString(i.Id)
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}
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// SpacePath path of the blank page
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func (i EPUBImage) SpacePath() string {
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return "Text/" + i.SpaceKey() + ".xhtml"
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}
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// EPUBSpacePath path of the blank page into the EPUB
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func (i EPUBImage) EPUBSpacePath() string {
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return "OEBPS/" + i.SpacePath()
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}
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func (i EPUBImage) PartKey() string {
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return utils.IntToString(i.Id) + "_p" + utils.IntToString(i.Part)
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}
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// PageKey key for page
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func (i EPUBImage) PageKey() string {
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return "page_" + i.PartKey()
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}
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// PagePath page path linked to the image
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func (i EPUBImage) PagePath() string {
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return "Text/" + i.PageKey() + ".xhtml"
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}
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// EPUBPagePath page path into the EPUB
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func (i EPUBImage) EPUBPagePath() string {
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return "OEBPS/" + i.PagePath()
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}
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// ImgKey key for image
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func (i EPUBImage) ImgKey() string {
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return "img_" + i.PartKey()
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}
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// ImgPath image path
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func (i EPUBImage) ImgPath() string {
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return "Images/" + i.ImgKey() + "." + i.Format
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}
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// EPUBImgPath image path into the EPUB
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func (i EPUBImage) EPUBImgPath() string {
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return "OEBPS/" + i.ImgPath()
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}
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// ImgStyle style to apply to the image.
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//
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// center by default.
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// align to left or right if it's part of the split double page.
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func (i EPUBImage) ImgStyle(viewWidth, viewHeight int, align string) string {
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relWidth, relHeight := i.RelSize(viewWidth, viewHeight)
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marginW, marginH := float64(viewWidth-relWidth)/2, float64(viewHeight-relHeight)/2
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style := make([]string, 0, 4)
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style = append(style, "width:"+utils.IntToString(relWidth)+"px")
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style = append(style, "height:"+utils.IntToString(relHeight)+"px")
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style = append(style, "top:"+utils.FloatToString(marginH*100/float64(viewHeight), 2)+"%")
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if align == "" {
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switch i.Position {
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case "rendition:page-spread-left":
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style = append(style, "right:0")
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case "rendition:page-spread-right":
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style = append(style, "left:0")
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default:
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style = append(style, "left:"+utils.FloatToString(marginW*100/float64(viewWidth), 2)+"%")
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}
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} else {
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style = append(style, align)
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}
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return strings.Join(style, "; ")
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}
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func (i EPUBImage) RelSize(viewWidth, viewHeight int) (relWidth, relHeight int) {
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w, h := viewWidth, viewHeight
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srcw, srch := i.Width, i.Height
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if w <= 0 || h <= 0 || srcw <= 0 || srch <= 0 {
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return
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}
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wratio := float64(srcw) / float64(w)
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hratio := float64(srch) / float64(h)
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if wratio > hratio {
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relWidth = w
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relHeight = int(float64(srch)/wratio + 0.5)
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} else {
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relHeight = h
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relWidth = int(float64(srcw)/hratio + 0.5)
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}
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return
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}
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