add:点名快抽

Ink Canvas/Converters/PositionConverters.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Globalization;
+using System.Windows.Data;
+
+namespace Ink_Canvas.Converters
+{
+    /// <summary>
+    /// 位置计算转换器
+    /// </summary>
+    public class PositionConverters
+    {
+        /// <summary>
+        /// 减法转换器
+        /// </summary>
+        public class SubtractConverter : IValueConverter
+        {
+            public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+            {
+                if (value is double baseValue && parameter is string paramStr)
+                {
+                    if (double.TryParse(paramStr, out double subtractValue))
+                    {
+                        return baseValue - subtractValue;
+                    }
+                }
+                return value;
+            }
+
+            public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+            {
+                throw new NotImplementedException();
+            }
+        }
+    }
+}