Add convenience constructors for attributes

attribute.go

@@ -77,6 +77,47 @@ type AttrFace struct { font.Face }
 // AttrAlign sets the alignment, if the box is a ContentBox.
 type AttrAlign struct { X, Y Align }
 
+// AColor is a convenience constructor for the color attribute.
+func AColor (col color.Color) AttrColor {
+	return AttrColor { Color: col }
+}
+// ATexture is a convenience constructor for the texture attribute.
+func ATexture (texture canvas.Texture) AttrTexture {
+	return AttrTexture { Texture: texture }
+}
+// ABorder is a convenience constructor for the border attribute.
+func ABorder (borders ...Border) AttrBorder {
+	return AttrBorder(borders)
+}
+// AMinimumSize is a convenience constructor for the minimum size attribute.
+func AMinimumSize (x, y int) AttrMinimumSize {
+	return AttrMinimumSize(image.Pt(x, y))
+}
+// APadding is a convenience constructor for the padding attribute.
+func APadding (sides ...int) AttrPadding {
+	return AttrPadding(I(sides...))
+}
+// AGap is a convenience constructor for the gap attribute.
+func AGap (x, y int) AttrGap {
+	return AttrGap(image.Pt(x, y))
+}
+// ATextColor is a convenience constructor for the text color attribute.
+func ATextColor (col color.Color) AttrTextColor {
+	return AttrTextColor { Color: col }
+}
+// ADotColor is a convenience constructor for the dot color attribute.
+func ADotColor (col color.Color) AttrDotColor {
+	return AttrDotColor { Color: col }
+}
+// AFace is a convenience constructor for the face attribute.
+func AFace (face font.Face) AttrFace {
+	return AttrFace { Face: face }
+}
+// AAlign is a convenience constructor for the align attribute.
+func AAlign (x, y Align) AttrAlign {
+	return AttrAlign { X: x, Y: y }
+}
+
 func (AttrColor)       attr () int { return 0 }
 func (AttrTexture)     attr () int { return 1 }
 func (AttrBorder)      attr () int { return 2 }