text alignment

1 files changed, 16 insertions, 4 deletions

diff --git a/gui/text/text.go b/gui/text/text.go
index dfe60e1..942dce2 100644
--- a/gui/text/text.go
+++ b/gui/text/text.go
@@ -38,12 +38,19 @@ func init() {
 	face = &concurrentFace{sync.Mutex{}, fce}
 }
 
+type Align int
+
+const (
+	ALIGN_LEFT Align = iota
+	ALIGN_RIGHT
+)
+
 func Size(text string) image.Point {
 	bounds := textBounds([]byte(text), font.Drawer{Face: face})
 	return image.Point{bounds.Max.X - bounds.Min.X + 2*PAD, bounds.Max.Y - bounds.Min.Y + 2*PAD}
 }
 
-func Draw(text []byte, dst draw.Image, r image.Rectangle, fg, bg color.Color) {
+func Draw(text []byte, dst draw.Image, r image.Rectangle, fg, bg color.Color, align Align) {
 	drawer := font.Drawer{
 		Src:  &image.Uniform{fg},
 		Face: face,
@@ -60,11 +67,16 @@ func Draw(text []byte, dst draw.Image, r image.Rectangle, fg, bg color.Color) {
 	drawer.Dst = textImg
 	drawer.DrawBytes(text)
 
-	// draw text image over background
 	leftCentre := image.Pt(bounds.Min.X, (bounds.Min.Y+bounds.Max.Y)/2)
-	target := image.Pt(r.Max.X-bounds.Max.X-PAD, (r.Min.Y+r.Max.Y)/2)
+	var target image.Point
+	switch align {
+	case ALIGN_LEFT:
+		target = image.Pt(r.Min.X+PAD, (r.Min.Y+r.Max.Y)/2)
+	case ALIGN_RIGHT:
+		target = image.Pt(r.Max.X-bounds.Max.X-PAD, (r.Min.Y+r.Max.Y)/2)
+	}
 	delta := target.Sub(leftCentre)
-	draw.Draw(dst, bounds.Add(delta).Intersect(r), drawer.Dst, bounds.Min, draw.Src)
+	draw.Draw(dst, bounds.Add(delta).Intersect(r), textImg, bounds.Min, draw.Src)
 }
 
 func textBounds(text []byte, drawer font.Drawer) image.Rectangle {