1 files changed, 82 insertions, 0 deletions
diff --git a/grapher/FieldXY.cs b/grapher/FieldXY.cs
new file mode 100644
index 0000000..f06cc4f
--- /dev/null
+++ b/grapher/FieldXY.cs
@@ -0,0 +1,82 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace grapher
+{
+    public class FieldXY
+    {
+        public FieldXY(TextBox xBox, TextBox yBox, CheckBox lockCheckBox, Form containingForm, double defaultData)
+        {
+            XField = new Field(xBox, containingForm, defaultData);
+            YField = new Field(yBox, containingForm, defaultData);
+            LockCheckBox = lockCheckBox;
+            DefaultData = defaultData;
+            LockCheckBox.CheckedChanged += new System.EventHandler(CheckChanged);
+            SetLocked();
+        }
+        public double X
+        {
+            get => XField.Data;
+        }
+
+        public double Y
+        {
+            get
+            {
+                if (Locked)
+                {
+                    return X;
+                }
+                else
+                {
+                    return YField.Data;
+                }
+            }
+        }
+
+        public CheckBox LockCheckBox { get; }
+
+        private Field XField { get; }
+
+        private Field YField { get; }
+
+        private double DefaultData { get; }
+
+        private bool Locked { get; set; }
+
+        private void CheckChanged(object sender, EventArgs e)
+        {
+            if (LockCheckBox.CheckState == CheckState.Checked)
+            {
+                SetUnlocked();
+            }
+            else
+            {
+                SetLocked();
+            }
+        }
+
+        private void SetLocked()
+        {
+            Locked = true;
+            YField.SetToUnavailable();
+        }
+
+        private void SetUnlocked()
+        {
+            Locked = false;
+            if (XField.State == Field.FieldState.Default)
+            {
+                YField.SetToDefault();
+            }
+            else
+            {
+                YField.SetToEntered(XField.Data);
+            }
+        }
+    }
+}