Finding ellipses and parasites.

[master-thesis.git] / Parasitemia / Parasitemia / Types.fs

diff --git a/Parasitemia/Parasitemia/Types.fs b/Parasitemia/Parasitemia/Types.fs
index 308fc6b..589a735 100644 (file)
--- a/Parasitemia/Parasitemia/Types.fs
+++ b/Parasitemia/Parasitemia/Types.fs
@@ -2,7 +2,14 @@
 
 open System
 
-type Ellipse = { cx: float; cy: float; a: float; b: float; alpha: float }
-    
+type Ellipse (cx: float, cy: float, a: float, b: float, alpha: float) =
+    member this.Cx = cx
+    member this.Cy = cy
+    member this.A = a
+    member this.B = b
+    member this.Alpha = alpha
+    member this.Area = a * b * Math.PI
 
-//type PointImg = { x: int; y: int }
\ No newline at end of file
+    // Does the ellipse contain the point (x, y)?.
+    member this.Contains x y = 
+        ((x - cx) * cos alpha + (y - cy) * sin alpha) ** 2.0 / a ** 2.0 + ((x - cx) * sin alpha - (y - cy) * cos alpha) ** 2.0 / b ** 2.0 <= 1.0
\ No newline at end of file