Added text width function for font

allegro5/font.go

@@ -6,53 +6,60 @@ package allegro5
 import "C"
 
 import (
-  "fmt"
-  "unsafe"
+	"fmt"
+	"unsafe"
 )
 
 type Font struct {
-  font *C.ALLEGRO_FONT
+	font *C.ALLEGRO_FONT
 }
 
 type HorizontalAlignment int
 
 const (
-  AlignLeft HorizontalAlignment = iota
-  AlignCenter
-  AlignRight
+	AlignLeft HorizontalAlignment = iota
+	AlignCenter
+	AlignRight
 )
 
 func LoadTTFFont(path string, size int) (*Font, error) {
-  p := C.CString(path)
-  defer C.free(unsafe.Pointer(p))
+	p := C.CString(path)
+	defer C.free(unsafe.Pointer(p))
 
-  f := C.al_load_ttf_font(p, C.int(size), 0)
-  if nil == f {
-    return nil, fmt.Errorf("Unable to load TTF font '%s'", path)
-  }
-  return &Font{f}, nil
+	f := C.al_load_ttf_font(p, C.int(size), 0)
+	if nil == f {
+		return nil, fmt.Errorf("Unable to load TTF font '%s'", path)
+	}
+	return &Font{f}, nil
 }
 
 func (f *Font) drawFlags(a HorizontalAlignment) C.int {
-  switch a {
-    case AlignLeft:
-    return C.ALLEGRO_ALIGN_LEFT
-    case AlignCenter:
-    return C.ALLEGRO_ALIGN_CENTRE
-    case AlignRight:
-    return C.ALLEGRO_ALIGN_RIGHT
-  }
-  return C.ALLEGRO_ALIGN_LEFT
+	switch a {
+	case AlignLeft:
+		return C.ALLEGRO_ALIGN_LEFT
+	case AlignCenter:
+		return C.ALLEGRO_ALIGN_CENTRE
+	case AlignRight:
+		return C.ALLEGRO_ALIGN_RIGHT
+	}
+	return C.ALLEGRO_ALIGN_LEFT
 }
 
 func (f *Font) Draw(left, top float32, color Color, align HorizontalAlignment, text string) {
-  t := C.CString(text)
-  defer C.free(unsafe.Pointer(t))
+	t := C.CString(text)
+	defer C.free(unsafe.Pointer(t))
 
-  flags := f.drawFlags(align)
-  C.al_draw_text(f.font, color.color, C.float(left), C.float(top), flags, t)
+	flags := f.drawFlags(align)
+	C.al_draw_text(f.font, color.color, C.float(left), C.float(top), flags, t)
+}
+
+func (f *Font) TextWidth(text string) float32 {
+	t := C.CString(text)
+	defer C.free(unsafe.Pointer(t))
+
+	return float32(C.al_get_text_width(f.font, t))
 }
 
 func (f *Font) Destroy() {
-  C.al_destroy_font(f.font)
+	C.al_destroy_font(f.font)
 }