utli fn

rms80 · rms80 · commit b375ce5effb2 · 2018-10-03T14:18:13.000-04:00
diff --git a/curve/Circle2.cs b/curve/Circle2.cs
@@ -152,5 +152,12 @@ public static double RadiusCircumference(double r) {
             return MathUtil.TwoPI * r;
         }
 
+        /// <summary>
+        /// Radius of n-sided regular polygon that contains circle of radius r
+        /// </summary>
+        public static double BoundingPolygonRadius(double r, int n) {
+            double theta = (MathUtil.TwoPI / (double)n) / 2.0;
+            return r / Math.Cos(theta);
+        }
     }
 }

Original file line number	Diff line number	Diff line change
`@@ -152,5 +152,12 @@ public static double RadiusCircumference(double r) {`
`152`	`152`	`return MathUtil.TwoPI * r;`
`153`	`153`	`}`
`154`	`154`
	`155`	`+ /// <summary>`
	`156`	`+ /// Radius of n-sided regular polygon that contains circle of radius r`
	`157`	`+ /// </summary>`
	`158`	`+ public static double BoundingPolygonRadius(double r, int n) {`
	`159`	`+ double theta = (MathUtil.TwoPI / (double)n) / 2.0;`
	`160`	`+ return r / Math.Cos(theta);`
	`161`	`+ }`
`155`	`162`	`}`
`156`	`163`	`}`