Add support for rotated appendices: implement 90° CCW image rotation for portrait pages, enhance table rendering logic, and update diagram handling directives.

pdf_renderer.go

@@ -55,6 +55,7 @@ const (
 type Appendix struct {
 	Kind      AppendixKind
 	Landscape bool // true → render on a landscape A4 page (15 mm symmetric margins)
+	Rotated   bool // true → portrait page, image rotated 90° CCW so long axis runs top-to-bottom
 	Title     string
 	Path      string           // image path (Kind == AppendixKindImage)
 	TableData [][][]InlineSpan // table rows (Kind == AppendixKindTable)
@@ -194,6 +195,35 @@ func (r *IHKRenderer) AddCodeAppendix(title, lang, code string) {
 	})
 }
 
+// AddRotatedImageAppendix registers an image annex rendered on a portrait A4 page
+// with the image rotated 90° CCW, so a wide (landscape-ratio) diagram fills the
+// full page height when the reader tilts the page 90° clockwise.
+// Format: "Title | /path/to/image"
+func (r *IHKRenderer) AddRotatedImageAppendix(titlePath string) {
+	parts := strings.SplitN(titlePath, "|", 2)
+	if len(parts) < 2 {
+		log.Printf("warning: @AnhangBildGedreht directive missing '|' separator: %q", titlePath)
+		return
+	}
+	r.appendices = append(r.appendices, Appendix{
+		Kind:    AppendixKindImage,
+		Rotated: true,
+		Title:   strings.TrimSpace(parts[0]),
+		Path:    strings.TrimSpace(parts[1]),
+	})
+}
+
+// AddRotatedUMLAppendix registers a UML/diagram annex (code block) rendered on a
+// portrait A4 page with the diagram image rotated 90° CCW.
+func (r *IHKRenderer) AddRotatedUMLAppendix(title, imgPath string) {
+	r.appendices = append(r.appendices, Appendix{
+		Kind:    AppendixKindImage,
+		Rotated: true,
+		Title:   title,
+		Path:    imgPath,
+	})
+}
+
 // AddLandscapeAppendix registers an image annex in "Title | /path/to/image" format
 // that will be rendered on a landscape A4 page with 15 mm symmetric margins.
 func (r *IHKRenderer) AddLandscapeAppendix(titlePath string) {