From 8dc672361ebc481cbe9418f7dd4d307095ee9f98 Mon Sep 17 00:00:00 2001 From: Pietro Gagliardi Date: Sat, 16 Jan 2016 18:27:18 -0500 Subject: More documentation. --- draw.go | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'draw.go') diff --git a/draw.go b/draw.go index b136574..d860e2b 100644 --- a/draw.go +++ b/draw.go @@ -810,6 +810,16 @@ func (l *TextLayout) SetWidth(width float64) { // even if no glyph reaches to the top of its ascent or bottom of its // descent; it does not return a "best fit" rectnagle for the points that // are actually drawn. +// +// For a single-line TextLayout (where the width is negative), if there +// are no font changes throughout the TextLayout, then the height +// returned by TextLayout is equivalent to the sum of the ascent and +// descent of its default font's metrics. Or in other words, after +// f := ui.LoadClosestFont(...) +// l := ui.NewTextLayout("text", f, -1) +// metrics := f.Metrics() +// _, height := l.Extents() +// metrics.Ascent+metrics.Descent and height are equivalent. func (l *TextLayout) Extents() (width float64, height float64) { cwidth := C.newDouble() cheight := C.newDouble() -- cgit v1.2.3