v0.0.495

imageext/types.go

@@ -1,5 +1,7 @@
 package imageext
 
+import "image"
+
 type Rectangle struct {
 	X float64
 	Y float64
@@ -22,3 +24,12 @@ func (r PercentageRectangle) Of(ref Rectangle) Rectangle {
 		H: r.H * ref.H,
 	}
 }
+
+func calcRelativeRect(inner image.Rectangle, outer image.Rectangle) PercentageRectangle {
+	return PercentageRectangle{
+		X: float64(inner.Min.X-outer.Min.X) / float64(outer.Dx()),
+		Y: float64(inner.Min.Y-outer.Min.Y) / float64(outer.Dy()),
+		W: float64(inner.Dx()) / float64(outer.Dx()),
+		H: float64(inner.Dy()) / float64(outer.Dy()),
+	}
+}