feat(fermata): add fermata support

Author: jodi-ivan

internal/entity/renderer.go

@@ -62,6 +62,7 @@ type NoteRenderer struct {
 	Tie          *Slur
 	Articulation *Articulation
 	Barline      *musicxml.Barline
+	Fermata      *musicxml.Femata
 	// internal use
 	IsLengthTakenFromLyric bool
 	IndexPosition          int

internal/musicxml/entity.go

@@ -336,10 +336,22 @@ type Tuplet struct {
 	Braket Bool       `xml:"braket,attr"`
 }
 
+type FemataType string
+
+const (
+	FermataTypeUpright  FemataType = "upright"
+	FermataTypeInverted FemataType = "inverted"
+)
+
+type Femata struct {
+	Type FemataType `xml:"type,attr"`
+}
+
 type NoteNotation struct {
 	Slur         []NotationSlur        `xml:"slur" json:",omitempty"`
 	Tied         *Tie                  `xml:"tied" json:",omitempty"`
 	Articulation *NotationArticulation `xml:"articulations" json:",omitempty"`
+	Fermata      *Femata               `xml:"fermata"`
 
 	// TODO: stacking tuplets / tuplet inside the tuplet
 	Tuplet *Tuplet `xml:"tuplet"`

internal/staff/align.go

@@ -182,6 +182,18 @@ func (rsa *renderStaffAlign) RenderWithAlign(ctx context.Context, canv canvas.Ca
 				if n.Strikethrough {
 					canv.Line(n.PositionX+10, y-16, n.PositionX, y+5, "fill:none;stroke:#000000;stroke-linecap:round;stroke-width:1.45")
 				}
+
+				if n.Fermata != nil {
+					fermataUnicode := `𝄐`
+					posX := float64(n.PositionX) - (rsa.Lyric.CalculateLyricWidth(fmt.Sprintf("%d", n.Note)) / 2)
+
+					fmt.Fprintf(
+						canv.Writer(),
+						`<text x="%.3f" y="%.3f" style="font-family:Noto Music;font-size:200%%"> %s </text>`,
+						posX, float64(y)-17.5, fermataUnicode,
+					)
+				}
+
 			}
 			fmt.Fprintf(canv.Writer(), `<title>Width: %d</title>`, n.Width)
 			canv.Gend()

internal/staff/staff.go

@@ -115,6 +115,10 @@ func (si *staffInteractor) RenderStaff(ctx context.Context, canv canvas.Canvas,
 				TimeModifications: note.TimeModification,
 			}
 
+			if note.Notations != nil && note.Notations.Fermata != nil {
+				renderer.Fermata = note.Notations.Fermata
+			}
+
 			staffInfo.Multiline = staffInfo.Multiline || renderer.IsNewLine
 
 			// text above the measure