Method MeasureText

text/font.go:172–197

MeasureText returns the minimum width and height in pixels necessary for an image to contain the specified text. The supplied text string can contain line break escape sequences (\n).

(text string)

// MeasureText returns the minimum width and height in pixels necessary for an image to contain
// the specified text. The supplied text string can contain line break escape sequences (\n).
func (f *Font) MeasureText(text string) (int, int) {

	// Create font drawer
	f.updateFace()
	d := &font.Drawer{Dst: nil, Src: f.fg, Face: f.face}

	// Draw text
	var width, height int
	metrics := f.face.Metrics()
	lineHeight := (metrics.Ascent + metrics.Descent).Ceil()
	lineGap := int((f.attrib.LineSpacing - float64(1)) * float64(lineHeight))

	lines := strings.Split(text, "\n")
	for i, s := range lines {
		d.Dot = fixed.P(0, height)
		lineWidth := d.MeasureString(s).Ceil()
		if lineWidth > width {
			width = lineWidth
		}
		height += lineHeight
		if i > 1 {
			height += lineGap
		}
	}
	return width, height
}

// Metrics returns the font metrics.
func (f *Font) Metrics() font.Metrics {