Neuerstellung

RadialMenu/Converters/RadialMenuItemToArrowPosition.cs

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+using System;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
+
+namespace RadialMenu.Converters
+{
+    internal class RadialMenuItemToArrowPosition : IMultiValueConverter
+    {
+        public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (values.Length != 5)
+            {
+                throw new ArgumentException("RadialMenuItemToArrowPosition converter needs 7 values (double centerX, double centerY, double arrowWidth, double arrowHeight, double arrowRadius) !", "values");
+            }
+            if (parameter == null)
+            {
+                throw new ArgumentNullException("parameter", "RadialMenuItemToArrowPosition converter needs the parameter (string axis) !");
+            }
+
+            string axis = (string)parameter;
+
+            if (axis != "X" && axis != "Y")
+            {
+                throw new ArgumentException("RadialMenuItemToArrowPosition parameter needs to be 'X' or 'Y' !", "parameter");
+            }
+
+            double centerX = (double)values[0];
+            double centerY = (double)values[1];
+            double arrowWidth = (double)values[2];
+            double arrowHeight = (double)values[3];
+            double arrowRadius = (double)values[4];
+
+            if (axis == "X")
+            {
+                return centerX - (arrowWidth / 2);
+            }
+
+            return centerY - arrowRadius - (arrowHeight / 2);
+        }
+
+        public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
+        {
+            throw new InvalidOperationException("RadialMenuItemToArrowPosition is a One-Way converter only !");
+        }
+
+        private static Point ComputeCartesianCoordinate(Point center, double angle, double radius)
+        {
+            // Converts to radians
+            double radiansAngle = (Math.PI / 180.0) * (angle - 90);
+            double x = radius * Math.Cos(radiansAngle);
+            double y = radius * Math.Sin(radiansAngle);
+            return new Point(x + center.X, y + center.Y);
+        }
+    }
+}