Users losing track of where their Blocks are in Flowchart window #302

Assets/Fungus/Flowchart/Editor/FlowchartEditor.cs

@@ -67,11 +67,19 @@ namespace Fungus
 
 			GUILayout.BeginHorizontal();
 			GUILayout.FlexibleSpace();
-			if (GUILayout.Button("Flowchart Window"))
+			if (GUILayout.Button(new GUIContent("Open Flowchart Window", "Opens the Flowchart Window")))
 			{
 				EditorWindow.GetWindow(typeof(FlowchartWindow), false, "Flowchart");
 			}
 
+			GUILayout.Space(10);
+
+			if (GUILayout.Button(new GUIContent("Center View", "Centers the window view at the center of all blocks in the Flowchart")))
+			{
+				// Reset the zoom so we don't have adjust the center position depending on zoom
+				flowchart.scrollPos = flowchart.centerPosition;
+				flowchart.zoom = FlowchartWindow.maxZoomValue;
+			}
 			GUILayout.FlexibleSpace();
 			GUILayout.EndHorizontal();
 

Assets/Fungus/Flowchart/Editor/FlowchartWindow.cs

@@ -19,8 +19,8 @@ namespace Fungus
 		protected int dragWindowId = -1;
 		protected Vector2 startDragPosition;
 
-		protected const float minZoomValue = 0.25f;
+		public const float minZoomValue = 0.25f;
-		protected const float maxZoomValue = 1f;
+		public const float maxZoomValue = 1f;
 
 		protected GUIStyle nodeStyle = new GUIStyle();
 
@@ -248,6 +248,10 @@ namespace Fungus
 				Selection.activeGameObject = flowchart.gameObject;
 			}
 
+			// The center of the Flowchart depends on the block positions and window dimensions, so we calculate it 
+			// here in the FlowchartWindow class and store it on the Flowchart object for use later.
+			CalcFlowchartCenter(flowchart, blocks);
+
 			// Draw connections
 			foreach (Block block in blocks)
 			{
@@ -391,6 +395,33 @@ namespace Fungus
 			EditorZoomArea.End();
 		}
 
+		public virtual void CalcFlowchartCenter(Flowchart flowchart, Block[] blocks)
+		{
+			if (flowchart == null ||
+				blocks.Count() == 0)
+			{
+				return;
+			}
+
+			Vector2 min = blocks[0].nodeRect.min;
+			Vector2 max = blocks[0].nodeRect.max;
+
+			foreach (Block block in blocks)
+			{
+				min.x = Mathf.Min(min.x, block.nodeRect.center.x);
+				min.y = Mathf.Min(min.y, block.nodeRect.center.y);
+				max.x = Mathf.Max(max.x, block.nodeRect.center.x);
+				max.y = Mathf.Max(max.y, block.nodeRect.center.y);
+			}
+
+			Vector2 center = (min + max) * -0.5f;
+
+			center.x += position.width * 0.5f;
+			center.y += position.height * 0.5f;
+
+			flowchart.centerPosition = center;
+		}
+
 		protected virtual void PanAndZoom(Flowchart flowchart)
 		{
 			// Right click to drag view

Assets/Fungus/Flowchart/Scripts/Flowchart.cs

@@ -130,6 +130,12 @@ namespace Fungus
 		[Tooltip("List of commands to hide in the Add Command menu. Use this to restrict the set of commands available when editing a Flowchart.")]
 		public List<string> hideCommands = new List<string>();
 
+		/**
+		 * Position in the center of all blocks in the flowchart.
+		 */
+		[NonSerialized]
+		public Vector2 centerPosition = Vector2.zero;
+
 		/**
 		 * Cached list of flowchart objects in the scene for fast lookup
 		 */