Function NewTextLine

text.go:316–397

NewTextLine is a simple text line using a single font face, a string (supporting new lines) and horizontal alignment (Left, Center, Right). The text's baseline will be drawn on the current coordinate.

(face *FontFace, s string, halign TextAlign)

// NewTextLine is a simple text line using a single font face, a string (supporting new lines) and horizontal alignment (Left, Center, Right). The text's baseline will be drawn on the current coordinate.
func NewTextLine(face *FontFace, s string, halign TextAlign) *Text {
	t := &Text{
		fonts: map[*Font]bool{face.Font: true},
		Text:  s,
	}

	ascent, descent, spacing := face.Metrics().Ascent, face.Metrics().Descent, face.Metrics().LineGap

	i := 0
	y := 0.0
	skipNext := false
	for j, r := range s + "\n" {
		if text.IsParagraphSeparator(r) {
			if skipNext {
				skipNext = false
				i++
				continue
			}
			if i < j {
				x := 0.0
				ppem := face.PPEM(DefaultResolution)
				line := line{y: y, spans: []TextSpan{}}
				for _, item := range itemizeString(s[i:j]) {
					direction, _ := scriptDirection(HorizontalTB, Natural, item.Script, item.Level, face.Direction)
					glyphs := face.Font.shaper.Shape(item.Text, ppem, direction, face.Script, face.Language, face.Font.features, face.Font.variations)
					width := face.textWidth(glyphs)
					line.spans = append(line.spans, TextSpan{
						X:         x,
						Width:     width,
						Face:      face,
						Text:      item.Text,
						Glyphs:    glyphs,
						Direction: direction,
						Level:     item.Level,
					})
					x += width
				}
				if halign == Center || halign == Middle {
					for k := range line.spans {
						line.spans[k].X = -x / 2.0
					}
				} else if halign == Right {
					for k := range line.spans {
						line.spans[k].X = -x
					}
				}

				// reorder runs of RTL text
				reorderSpans(line.spans)

				t.lines = append(t.lines, line)
			}
			y += ascent + descent + spacing
			i = j + utf8.RuneLen(r)
			skipNext = r == '\r' && j+1 < len(s) && s[j+1] == '\n'
		}
	}
	if halign == Left {