Added: some numeric text inputs now support expressions (e.g. (23+15)*1.5). - inspired by https://www.doomworld.com/vb/doom-editing/91089-gzdoombuilder-patch-expression-evaluation-for-sector-heights/

Fixed, Game Configurations window: fixed a crash when switching to a game engine without the file path using the "Engine" drop-down.

Source/Core/Controls/ButtonsNumericTextbox.cs

@@ -55,6 +55,7 @@ namespace CodeImp.DoomBuilder.Controls
 		public bool AllowNegative { get { return textbox.AllowNegative; } set { textbox.AllowNegative = value; } }
 		public bool AllowRelative { get { return textbox.AllowRelative; } set { textbox.AllowRelative = value; } }
 		public int MaximumValue { get { return textbox.MaximumValue; } set { textbox.MaximumValue = value; } }
+		public bool AllowExpressions { get { return textbox.AllowExpressions; } set { textbox.AllowExpressions = value; } } //mxd/mgr_inz_rafal
 		public int ButtonStep { get { return stepsize; } set { stepsize = value; } }
 		public float ButtonStepFloat { get { return stepsizeFloat; } set { stepsizeFloat = value; } } //mxd. This is used when AllowDecimal is true
 		public float ButtonStepBig { get { return stepsizeBig; } set { stepsizeBig = value; } } //mxd

Source/Core/Controls/NumericTextbox.cs

@@ -18,6 +18,7 @@
 
 using System;
 using System.ComponentModel;
+using System.Data;
 using System.Drawing;
 using System.Globalization;
 using System.Windows.Forms;
@@ -30,6 +31,8 @@ namespace CodeImp.DoomBuilder.Controls
 	{
 		#region ================== Constants
 
+		private const int ROUNDING_PRECISION = 4; //mxd
+
 		#endregion
 
 		#region ================== Variables
@@ -38,9 +41,13 @@ namespace CodeImp.DoomBuilder.Controls
 		private bool allowrelative;		// Allow ++, --, * and / prefix for relative changes
 		private bool allowdecimal;		// Allow decimal (float) numbers
 		private int maximumvalue = System.Int32.MaxValue;
+		private bool allowexpressions;  // mxd/mgr_inz_rafal. Allow expressions
 		private bool controlpressed;
 		private int incrementstep; //mxd. Step for +++ and  --- prefixes
 		private ToolTip tooltip; //mxd
+
+		//mxd. Used to compute expressions
+		private static DataTable datatable = new DataTable();
 		
 		#endregion
 
@@ -50,6 +57,7 @@ namespace CodeImp.DoomBuilder.Controls
 		public bool AllowRelative { get { return allowrelative; } set { allowrelative = value; UpdateTextboxStyle(); } }
 		public bool AllowDecimal  { get { return allowdecimal; } set { allowdecimal = value; } }
 		public int MaximumValue { get { return maximumvalue; } set { maximumvalue = value; } }
+		public bool AllowExpressions { get { return allowexpressions; } set { allowexpressions = value; } } //mxd/mgr_inz_rafal
 
 		#endregion
 
@@ -103,8 +111,13 @@ namespace CodeImp.DoomBuilder.Controls
 			// Determine allowed chars
 			if(allownegative) allowedchars += CultureInfo.CurrentCulture.NumberFormat.NegativeSign;
 			if(allowrelative) allowedchars += "+-*/"; //mxd
+			if(allowexpressions)
+			{
+				allowedchars += "()"; //mxd/mgr_inz_rafal
+				if(!allowrelative) allowedchars += "+-*/"; //mxd
+			}
 			if(controlpressed) allowedchars += "\u0018\u0003\u0016";
-			if(allowdecimal || this.Text.StartsWith("*") || this.Text.StartsWith("/")) //mxd
+			if(allowdecimal || allowexpressions || this.Text.StartsWith("*") || this.Text.StartsWith("/")) //mxd
 				allowedchars += CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator;
 			
 			// Check if key is not allowed
@@ -113,7 +126,7 @@ namespace CodeImp.DoomBuilder.Controls
 				// Cancel this
 				e.Handled = true;
 			}
-			else
+			else if(!allowexpressions)
 			{
 				//mxd. Check if * or / is pressed
 				if(e.KeyChar == '*' || e.KeyChar == '/') 
@@ -182,6 +195,22 @@ namespace CodeImp.DoomBuilder.Controls
 			base.OnKeyPress(e);
 		}
 
+		//mxd
+		protected override void OnTextChanged(EventArgs e)
+		{
+			// Validate expression
+			if(allowexpressions)
+			{
+				// Check if expression is valid. We may want "++" and "--" on their own...
+				if(IsValidResult(StripPrefixes(this.Text)) || this.Text == "++" || this.Text == "--")
+					this.ForeColor = (allowrelative ? SystemColors.HotTrack : SystemColors.WindowText);
+				else
+					this.ForeColor = Color.DarkRed;
+			}
+			
+			base.OnTextChanged(e);
+		}
+
 		// Validate contents
 		protected override void OnValidating(CancelEventArgs e)
 		{
@@ -192,29 +221,55 @@ namespace CodeImp.DoomBuilder.Controls
 				base.OnValidating(e);
 				return;
 			}
-			
-			// Strip prefixes
-			string textpart = this.Text.Replace("+", "").Replace("*", "").Replace("/", ""); //mxd
-			if(!allownegative) textpart = textpart.Replace("-", "");
-			
-			// No numbers left?
-			if(textpart.Length == 0)
+
+			if(allowexpressions) //mxd
 			{
-				// Make the textbox empty
-				this.Text = "";
-			} 
+				if(!IsValidResult(StripPrefixes(this.Text)))
+				{
+					// Make the textbox empty
+					this.Text = "";
+				}
+			}
+			else
+			{
+				// Strip prefixes
+				string textpart = this.Text.Replace("+", "").Replace("*", "").Replace("/", ""); //mxd
+				if(!allownegative)
+					textpart = textpart.Replace("-", "");
+
+				// No numbers left?
+				if(textpart.Length == 0)
+				{
+					// Make the textbox empty
+					this.Text = "";
+				}
+			}
 			
 			// Call base
 			base.OnValidating(e);
 		}
+
+		//mxd
+		private string StripPrefixes(string input)
+		{
+			if(allowrelative)
+			{
+				// Strip prefixes
+				if(input.StartsWith("+++") || input.StartsWith("---")) return input.Substring(3);
+				if(input.StartsWith("++") || input.StartsWith("--")) return input.Substring(2);
+				if(input.StartsWith("*") || input.StartsWith("/")) return input.Substring(1);
+			}
+
+			return input;
+		}
 		
 		// This checks if the number is relative
 		public bool CheckIsRelative()
 		{
 			// Prefixed with +++, ---, ++, --, * or /?
 			return ( (this.Text.Length > 3 && (this.Text.StartsWith("+++") || this.Text.StartsWith("---"))) || //mxd
-				(this.Text.Length > 2 && (this.Text.StartsWith("++") || this.Text.StartsWith("--") || this.Text.StartsWith("**") || this.Text.StartsWith("//"))) || //mxd
-				(this.Text.Length > 1 && (this.Text.StartsWith("*") || this.Text.StartsWith("/"))) ); //mxd
+					 (this.Text.Length > 2 && (this.Text.StartsWith("++") || this.Text.StartsWith("--") )) || //mxd
+					 (this.Text.Length > 1 && (this.Text.StartsWith("*") || this.Text.StartsWith("/"))) ); //mxd
 		}
 		
 		//mxd. This determines the result value
@@ -226,85 +281,7 @@ namespace CodeImp.DoomBuilder.Controls
 		//mxd. This determines the result value
 		public int GetResult(int original, int step)
 		{
-			string textpart = this.Text;
-			
-			// Strip prefixes
-			textpart = textpart.TrimStart('+', '-', '*', '/'); //mxd
-			
-			// Any numbers left?
-			if(textpart.Length > 0)
-			{
-				int result;
-
-				//mxd. Prefixed with +++?
-				if(this.Text.StartsWith("+++"))
-				{
-					// Add number to original
-					int.TryParse(textpart, out result);
-					int newvalue = original + result * step;
-					if (newvalue > maximumvalue) newvalue = maximumvalue;
-					return newvalue;
-				}
-				//mxd. Prefixed with ---?
-				if(this.Text.StartsWith("---"))
-				{
-					// Subtract number from original
-					int.TryParse(textpart, out result);
-					int newvalue = original - result * step;
-					if (!allownegative && (newvalue < 0)) newvalue = 0;
-					return newvalue;
-				}
-				// Prefixed with ++?
-				if(this.Text.StartsWith("++"))
-				{
-					// Add number to original
-					int.TryParse(textpart, out result);
-					int newvalue = original + result;
-					if (newvalue > maximumvalue) newvalue = maximumvalue;
-					return newvalue;
-				}
-				// Prefixed with --?
-				if(this.Text.StartsWith("--"))
-				{
-					// Subtract number from original
-					int.TryParse(textpart, out result);
-					int newvalue = original - result;
-					if (!allownegative && (newvalue < 0)) newvalue = 0;
-					return newvalue;
-				}
-				//mxd. Prefixed with *?
-				if(this.Text.StartsWith("*")) 
-				{
-					// Multiply original by number
-					float resultf;
-					float.TryParse(textpart, NumberStyles.Float, CultureInfo.CurrentCulture, out resultf);
-					int newvalue = (int)Math.Round(original * resultf);
-					if (newvalue > maximumvalue) newvalue = maximumvalue;
-					if (!allownegative && (newvalue < 0)) newvalue = 0;
-					return newvalue;
-				}
-				//mxd. Prefixed with /?
-				if(this.Text.StartsWith("/")) 
-				{
-					// Divide original by number
-					float resultf;
-					float.TryParse(textpart, NumberStyles.Float, CultureInfo.CurrentCulture, out resultf);
-					if(resultf == 0) return original;
-					int newvalue = (int)Math.Round(original / resultf);
-					if (newvalue > maximumvalue) newvalue = maximumvalue;
-					if (!allownegative && (newvalue < 0)) newvalue = 0;
-					return newvalue;
-				}
-
-				//mxd. Return the new value
-				if(!int.TryParse(this.Text, out result)) return original;
-				if (result > maximumvalue) return maximumvalue;
-				if (!allownegative && (result < 0)) return 0;
-				return result;
-			}
-
-			// Nothing given, keep original value
-			return original;
+			return (int)Math.Round(GetResultFloat(original, step));
 		}
 
 		//mxd. This determines the result value
@@ -317,68 +294,97 @@ namespace CodeImp.DoomBuilder.Controls
 		public float GetResultFloat(float original, int step)
 		{
 			// Strip prefixes
-			string textpart = this.Text.Replace("+", "").Replace("-", "").Replace("*", "").Replace("/", ""); //mxd;
+			string textpart = StripPrefixes(this.Text);
 
 			// Any numbers left?
 			if(textpart.Length > 0)
 			{
 				float result;
-				
-				//mxd. Prefixed with +++?
-				if(this.Text.StartsWith("+++"))
+				if(allowrelative)
 				{
-					// Add number to original
-					if(!float.TryParse(textpart, NumberStyles.Float, CultureInfo.CurrentCulture, out result)) result = 0;
-					return original + result * step;
-				}
-				//mxd. Prefixed with ---?
-				if(this.Text.StartsWith("---"))
-				{
-					// Subtract number from original
-					if(!float.TryParse(textpart, NumberStyles.Float, CultureInfo.CurrentCulture, out result)) result = 0;
-					float newvalue = original - result * step;
-					if(!allownegative && (newvalue < 0)) newvalue = 0;
-					return newvalue;
-				}
-				// Prefixed with ++?
-				if(this.Text.StartsWith("++"))
-				{
-					// Add number to original
-					if(!float.TryParse(textpart, NumberStyles.Float, CultureInfo.CurrentCulture, out result)) result = 0;
-					return original + result;
-				}
-				// Prefixed with --?
-				if(this.Text.StartsWith("--"))
-				{
-					// Subtract number from original
-					if(!float.TryParse(textpart, NumberStyles.Float, CultureInfo.CurrentCulture, out result)) result = 0;
-					float newvalue = original - result;
-					if(!allownegative && (newvalue < 0)) newvalue = 0;
-					return newvalue;
-				}
-				//mxd. Prefixed with *?
-				if(this.Text.StartsWith("*")) 
-				{
-					// Multiply original by number
-					if(!float.TryParse(textpart, NumberStyles.Float, CultureInfo.CurrentCulture, out result)) result = 0;
-					float newvalue = original * result;
-					if(!allownegative && (newvalue < 0)) newvalue = 0;
-					return newvalue;
-				}
-				//mxd. Prefixed with /?
-				if(this.Text.StartsWith("/")) 
-				{
-					// Divide original by number
-					if(!float.TryParse(textpart, NumberStyles.Float, CultureInfo.CurrentCulture, out result) || result == 0) return original;
-					float newvalue = (float)Math.Round(original / result, 3);
-					if(!allownegative && (newvalue < 0)) newvalue = 0;
-					return newvalue;
+					//mxd. Prefixed with +++?
+					if(this.Text.StartsWith("+++"))
+					{
+						// Add number to original
+						if(TryGetResultValue(textpart, out result))
+							return original + result * step;
+
+						// Keep original value
+						return original;
+					}
+
+					//mxd. Prefixed with ---?
+					if(this.Text.StartsWith("---"))
+					{
+						// Subtract number from original
+						if(TryGetResultValue(textpart, out result))
+						{
+							float newvalue = original - result * step;
+							return (!allownegative && (newvalue < 0)) ? original : newvalue;
+						}
+
+						// Keep original value
+						return original;
+					}
+
+					// Prefixed with ++?
+					if(this.Text.StartsWith("++"))
+					{
+						// Add number to original
+						if(TryGetResultValue(textpart, out result))
+							return original + result;
+
+						// Keep original value
+						return original;
+					}
+
+					// Prefixed with --?
+					if(this.Text.StartsWith("--"))
+					{
+						// Subtract number from original
+						if(TryGetResultValue(textpart, out result))
+						{
+							float newvalue = original - result;
+							return (!allownegative && (newvalue < 0)) ? original : newvalue;
+						}
+
+						// Keep original value
+						return original;
+					}
+
+					//mxd. Prefixed with *?
+					if(this.Text.StartsWith("*"))
+					{
+						// Multiply original by number
+						if(TryGetResultValue(textpart, out result))
+						{
+							float newvalue = (float)Math.Round(original * result, ROUNDING_PRECISION);
+							return (!allownegative && (newvalue < 0f)) ? original : newvalue;
+						}
+
+						// Keep original value
+						return original;
+					}
+
+					//mxd. Prefixed with /?
+					if(this.Text.StartsWith("/"))
+					{
+						// Divide original by number
+						if(TryGetResultValue(textpart, out result))
+						{
+							if(result == 0.0f) return original;
+							float newvalue = (float)Math.Round(original / result, ROUNDING_PRECISION);
+							return (!allownegative && (newvalue < 0f)) ? original : newvalue;
+						}
+
+						// Keep original value
+						return original;
+					}
 				}
 
 				//mxd. Return the new value
-				if(!float.TryParse(this.Text, NumberStyles.Float, CultureInfo.CurrentCulture, out result)) return original;
-				if(!allownegative && (result < 0)) return 0;
-				return result;
+				if(TryGetResultValue(textpart, out result))
+					return (!allownegative && (result < 0f)) ? original : result;
 			}
 
 			// Nothing given, keep original value
@@ -386,20 +392,50 @@ namespace CodeImp.DoomBuilder.Controls
 		}
 
 		//mxd
-		public void UpdateTextboxStyle()
+		private bool IsValidResult(string expression)
 		{
-			UpdateTextboxStyle(string.Empty);
+			float unused;
+			return TryGetResultValue(expression, out unused);
 		}
 
 		//mxd
-		public void UpdateTextboxStyle(string tip) 
+		private bool TryGetResultValue(string expression, out float value)
+		{
+			//Compute expression
+			if(allowexpressions)
+			{
+				try { expression = datatable.Compute(expression, null).ToString(); }
+				catch
+				{
+					value = 0f;
+					return false;
+				}
+			}
+
+			// Parse result
+			return float.TryParse(expression, NumberStyles.Float, CultureInfo.InvariantCulture, out value);
+		}
+
+		//mxd
+		public void UpdateTextboxStyle() { UpdateTextboxStyle(string.Empty); }
+		public void UpdateTextboxStyle(string tip)
 		{
 			this.ForeColor = (allowrelative ? SystemColors.HotTrack : SystemColors.WindowText);
-			if(allowrelative)
+			if(allowrelative || allowexpressions)
 			{
-				tooltip.SetToolTip(this, "Use ++ or -- prefixes to change by given value." + Environment.NewLine +
-					"Use +++ or --- prefixes to incrementally change by given value." + Environment.NewLine + 
-					"Use * or / prefixes to multiply or divide by given value." + Environment.NewLine + tip);
+				string s = string.Empty;
+				if(allowexpressions)
+				{
+					s += "You can use expressions. Example: (128+64)*2.5" + Environment.NewLine;
+				}
+				if(allowrelative)
+				{
+					s += "Use ++ or -- prefixes to change by given value." + Environment.NewLine +
+						 "Use +++ or --- prefixes to incrementally change by given value." + Environment.NewLine +
+						 "Use * or / prefixes to multiply or divide by given value." + Environment.NewLine;
+				}
+				
+				tooltip.SetToolTip(this, s + tip);
 			}
 			else if(!string.IsNullOrEmpty(tip))
 			{

Source/Core/Controls/SectorSlopeControl.Designer.cs

@@ -166,6 +166,7 @@
 			this.slopeoffset.AllowDecimal = true;
 			this.slopeoffset.AllowNegative = true;
 			this.slopeoffset.AllowRelative = true;
+			this.slopeoffset.AllowExpressions = true;
 			this.slopeoffset.ButtonStep = 1;
 			this.slopeoffset.ButtonStepBig = 16F;
 			this.slopeoffset.ButtonStepFloat = 8F;

Source/Core/GZBuilder/Controls/PairedFieldsControl.Designer.cs

@@ -60,6 +60,7 @@
 			this.value1.AllowDecimal = false;
 			this.value1.AllowNegative = true;
 			this.value1.AllowRelative = true;
+			this.value1.AllowExpressions = true;
 			this.value1.ButtonStep = 1;
 			this.value1.ButtonStepFloat = 1F;
 			this.value1.ButtonStepsWrapAround = false;
@@ -76,6 +77,7 @@
 			this.value2.AllowDecimal = false;
 			this.value2.AllowNegative = true;
 			this.value2.AllowRelative = true;
+			this.value2.AllowExpressions = true;
 			this.value2.ButtonStep = 1;
 			this.value2.ButtonStepFloat = 1F;
 			this.value2.ButtonStepsWrapAround = false;

Source/Core/GZBuilder/Controls/PairedFloatControl.Designer.cs

@@ -39,6 +39,7 @@
 			this.value1.AllowDecimal = true;
 			this.value1.AllowNegative = true;
 			this.value1.AllowRelative = true;
+			this.value1.AllowExpressions = true;
 			this.value1.ButtonStep = 1;
 			this.value1.ButtonStepFloat = 1F;
 			this.value1.ButtonStepsWrapAround = false;
@@ -56,6 +57,7 @@
 			this.value2.AllowDecimal = true;
 			this.value2.AllowNegative = true;
 			this.value2.AllowRelative = true;
+			this.value2.AllowExpressions = true;
 			this.value2.ButtonStep = 1;
 			this.value2.ButtonStepFloat = 1F;
 			this.value2.ButtonStepsWrapAround = false;

Source/Core/GZBuilder/Controls/PairedIntControl.Designer.cs

@@ -49,6 +49,7 @@
 			this.value1.AllowDecimal = false;
 			this.value1.AllowNegative = true;
 			this.value1.AllowRelative = true;
+			this.value1.AllowExpressions = true;
 			this.value1.ButtonStep = 1;
 			this.value1.ButtonStepFloat = 1F;
 			this.value1.ButtonStepsWrapAround = false;
@@ -65,6 +66,7 @@
 			this.value2.AllowDecimal = false;
 			this.value2.AllowNegative = true;
 			this.value2.AllowRelative = true;
+			this.value2.AllowExpressions = true;
 			this.value2.ButtonStep = 1;
 			this.value2.ButtonStepFloat = 1F;
 			this.value2.ButtonStepsWrapAround = false;

Source/Core/Windows/ConfigForm.cs

@@ -325,7 +325,7 @@ namespace CodeImp.DoomBuilder.Windows
 			configinfo.TestProgram = testapplication.Text;
 			
 			//mxd. User entered engine name before picking the engine?
-			if(cbEngineSelector.SelectedIndex == -1)
+			if(cbEngineSelector.SelectedIndex == -1 || string.IsNullOrEmpty(configinfo.TestProgram))
 			{
 				ApplyTestEngineNameChange();
 			}
@@ -758,27 +758,26 @@ namespace CodeImp.DoomBuilder.Windows
 			{
 				preventchanges = true;
 
+				// Remove EngineInfos without program path
+				configinfo.TestEngines.RemoveAll(info => string.IsNullOrEmpty(info.TestProgram));
+
 				// Add new EngineInfo
 				EngineInfo newInfo = new EngineInfo();
 				newInfo.TestSkill = (int)Math.Ceiling(gameconfig.Skills.Count / 2f); // Set Medium skill level
 				configinfo.TestEngines.Add(newInfo);
 				configinfo.Changed = true;
 
-				// Store current engine name
-				if(!String.IsNullOrEmpty(cbEngineSelector.Text))
-					configinfo.TestProgramName = cbEngineSelector.Text;
-
 				// Refresh engines list
 				cbEngineSelector.Items.Clear();
 				foreach(EngineInfo info in configinfo.TestEngines)
 					cbEngineSelector.Items.Add(info.TestProgramName);
 
 				cbEngineSelector.SelectedIndex = configinfo.TestEngines.Count - 1;
-				btnRemoveEngine.Enabled = true;
+				btnRemoveEngine.Enabled = (configinfo.TestEngines.Count > 1);
 
 				preventchanges = false;
 
-				// Set engine path
+				// Set engine path (will also update current engine name)
 				testapplication.Text = testprogramdialog.FileName;
 			}
 		}
@@ -814,6 +813,8 @@ namespace CodeImp.DoomBuilder.Windows
 		private void cbEngineSelector_SelectedIndexChanged(object sender, EventArgs e) 
 		{
 			if(cbEngineSelector.SelectedIndex == -1) return;
+
+			preventchanges = true;
 			
 			//set new values
 			configinfo.CurrentEngineIndex = cbEngineSelector.SelectedIndex;
@@ -840,6 +841,8 @@ namespace CodeImp.DoomBuilder.Windows
             gametype.Value = gametypevalue - 1;
             gametype.Value = gametypevalue;
 			customparameters.Checked = configinfo.CustomParameters;
+
+			preventchanges = false;
 		}
 
 		//mxd

Source/Core/Windows/SectorEditForm.Designer.cs

@@ -214,6 +214,7 @@ namespace CodeImp.DoomBuilder.Windows
 			this.heightoffset.AllowDecimal = false;
 			this.heightoffset.AllowNegative = true;
 			this.heightoffset.AllowRelative = true;
+			this.heightoffset.AllowExpressions = true;
 			this.heightoffset.ButtonStep = 8;
 			this.heightoffset.ButtonStepBig = 16F;
 			this.heightoffset.ButtonStepFloat = 1F;
@@ -250,6 +251,7 @@ namespace CodeImp.DoomBuilder.Windows
 			this.ceilingheight.AllowDecimal = false;
 			this.ceilingheight.AllowNegative = true;
 			this.ceilingheight.AllowRelative = true;
+			this.ceilingheight.AllowExpressions = true;
 			this.ceilingheight.ButtonStep = 8;
 			this.ceilingheight.ButtonStepBig = 16F;
 			this.ceilingheight.ButtonStepFloat = 1F;
@@ -317,6 +319,7 @@ namespace CodeImp.DoomBuilder.Windows
 			this.floorheight.AllowDecimal = false;
 			this.floorheight.AllowNegative = true;
 			this.floorheight.AllowRelative = true;
+			this.floorheight.AllowExpressions = true;
 			this.floorheight.ButtonStep = 8;
 			this.floorheight.ButtonStepBig = 16F;
 			this.floorheight.ButtonStepFloat = 1F;

Source/Core/Windows/SectorEditFormUDMF.Designer.cs

@@ -398,6 +398,7 @@
 			this.heightoffset.AllowDecimal = false;
 			this.heightoffset.AllowNegative = true;
 			this.heightoffset.AllowRelative = true;
+			this.heightoffset.AllowExpressions = true;
 			this.heightoffset.ButtonStep = 8;
 			this.heightoffset.ButtonStepBig = 16F;
 			this.heightoffset.ButtonStepFloat = 1F;
@@ -416,6 +417,7 @@
 			this.ceilingheight.AllowDecimal = false;
 			this.ceilingheight.AllowNegative = true;
 			this.ceilingheight.AllowRelative = true;
+			this.ceilingheight.AllowExpressions = true;
 			this.ceilingheight.ButtonStep = 8;
 			this.ceilingheight.ButtonStepBig = 16F;
 			this.ceilingheight.ButtonStepFloat = 1F;
@@ -452,6 +454,7 @@
 			this.floorheight.AllowDecimal = false;
 			this.floorheight.AllowNegative = true;
 			this.floorheight.AllowRelative = true;
+			this.floorheight.AllowExpressions = true;
 			this.floorheight.ButtonStep = 8;
 			this.floorheight.ButtonStepBig = 16F;
 			this.floorheight.ButtonStepFloat = 1F;

Source/Core/Windows/ThingEditForm.Designer.cs

@@ -137,6 +137,7 @@ namespace CodeImp.DoomBuilder.Windows
 			this.posX.AllowDecimal = false;
 			this.posX.AllowNegative = true;
 			this.posX.AllowRelative = true;
+			this.posX.AllowExpressions = true;
 			this.posX.ButtonStep = 8;
 			this.posX.ButtonStepBig = 16F;
 			this.posX.ButtonStepFloat = 1F;
@@ -155,6 +156,7 @@ namespace CodeImp.DoomBuilder.Windows
 			this.posY.AllowDecimal = false;
 			this.posY.AllowNegative = true;
 			this.posY.AllowRelative = true;
+			this.posY.AllowExpressions = true;
 			this.posY.ButtonStep = 8;
 			this.posY.ButtonStepBig = 16F;
 			this.posY.ButtonStepFloat = 1F;
@@ -173,6 +175,7 @@ namespace CodeImp.DoomBuilder.Windows
 			this.posZ.AllowDecimal = false;
 			this.posZ.AllowNegative = true;
 			this.posZ.AllowRelative = true;
+			this.posZ.AllowExpressions = true;
 			this.posZ.ButtonStep = 8;
 			this.posZ.ButtonStepBig = 16F;
 			this.posZ.ButtonStepFloat = 1F;
@@ -353,6 +356,7 @@ namespace CodeImp.DoomBuilder.Windows
 			this.angle.AllowDecimal = false;
 			this.angle.AllowNegative = true;
 			this.angle.AllowRelative = true;
+			this.angle.AllowExpressions = true;
 			this.angle.ButtonStep = 5;
 			this.angle.ButtonStepBig = 15F;
 			this.angle.ButtonStepFloat = 1F;

Source/Core/Windows/ThingEditFormUDMF.Designer.cs

@@ -195,6 +195,7 @@
 			this.roll.AllowDecimal = false;
 			this.roll.AllowNegative = true;
 			this.roll.AllowRelative = true;
+			this.roll.AllowExpressions = true;
 			this.roll.ButtonStep = 5;
 			this.roll.ButtonStepBig = 15F;
 			this.roll.ButtonStepFloat = 1F;
@@ -222,6 +223,7 @@
 			this.pitch.AllowDecimal = false;
 			this.pitch.AllowNegative = true;
 			this.pitch.AllowRelative = true;
+			this.pitch.AllowExpressions = true;
 			this.pitch.ButtonStep = 5;
 			this.pitch.ButtonStepBig = 15F;
 			this.pitch.ButtonStepFloat = 1F;
@@ -249,6 +251,7 @@
 			this.angle.AllowDecimal = false;
 			this.angle.AllowNegative = true;
 			this.angle.AllowRelative = true;
+			this.angle.AllowExpressions = true;
 			this.angle.ButtonStep = 5;
 			this.angle.ButtonStepBig = 15F;
 			this.angle.ButtonStepFloat = 1F;
@@ -478,6 +481,7 @@
 			this.posX.AllowDecimal = true;
 			this.posX.AllowNegative = true;
 			this.posX.AllowRelative = true;
+			this.posX.AllowExpressions = true;
 			this.posX.ButtonStep = 8;
 			this.posX.ButtonStepBig = 8F;
 			this.posX.ButtonStepFloat = 1F;
@@ -496,6 +500,7 @@
 			this.posY.AllowDecimal = true;
 			this.posY.AllowNegative = true;
 			this.posY.AllowRelative = true;
+			this.posY.AllowExpressions = true;
 			this.posY.ButtonStep = 8;
 			this.posY.ButtonStepBig = 8F;
 			this.posY.ButtonStepFloat = 1F;
@@ -514,6 +519,7 @@
 			this.posZ.AllowDecimal = true;
 			this.posZ.AllowNegative = true;
 			this.posZ.AllowRelative = true;
+			this.posZ.AllowExpressions = true;
 			this.posZ.ButtonStep = 8;
 			this.posZ.ButtonStepBig = 8F;
 			this.posZ.ButtonStepFloat = 1F;

Source/Core/Windows/VertexEditForm.Designer.cs

@@ -125,6 +125,7 @@ namespace CodeImp.DoomBuilder.Windows
 			this.zceiling.AllowDecimal = false;
 			this.zceiling.AllowNegative = true;
 			this.zceiling.AllowRelative = true;
+			this.zceiling.AllowExpressions = true;
 			this.zceiling.ButtonStep = 8;
 			this.zceiling.ButtonStepBig = 16F;
 			this.zceiling.ButtonStepFloat = 1F;
@@ -143,6 +144,7 @@ namespace CodeImp.DoomBuilder.Windows
 			this.zfloor.AllowDecimal = false;
 			this.zfloor.AllowNegative = true;
 			this.zfloor.AllowRelative = true;
+			this.zfloor.AllowExpressions = true;
 			this.zfloor.ButtonStep = 8;
 			this.zfloor.ButtonStepBig = 16F;
 			this.zfloor.ButtonStepFloat = 1F;
@@ -179,6 +181,7 @@ namespace CodeImp.DoomBuilder.Windows
 			this.positiony.AllowDecimal = false;
 			this.positiony.AllowNegative = true;
 			this.positiony.AllowRelative = true;
+			this.positiony.AllowExpressions = true;
 			this.positiony.ButtonStep = 1;
 			this.positiony.ButtonStepBig = 8F;
 			this.positiony.ButtonStepFloat = 1F;
@@ -197,6 +200,7 @@ namespace CodeImp.DoomBuilder.Windows
 			this.positionx.AllowDecimal = false;
 			this.positionx.AllowNegative = true;
 			this.positionx.AllowRelative = true;
+			this.positionx.AllowExpressions = true;
 			this.positionx.ButtonStep = 1;
 			this.positionx.ButtonStepBig = 8F;
 			this.positionx.ButtonStepFloat = 1F;