Adding ScaleFactor to Zoom options.

joezearing · Apr 8, 2021 · 1ec1b67 · 1ec1b67
1 parent 93884b5
commit 1ec1b67
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Showing 2 changed files with 5 additions and 3 deletions.
diff --git a/src/Blazor.Diagrams.Core/Behaviors/ZoomBehavior.cs b/src/Blazor.Diagrams.Core/Behaviors/ZoomBehavior.cs
@@ -6,8 +6,6 @@ namespace Blazor.Diagrams.Core.Behaviors
 {
     public class ZoomBehavior : Behavior
     {
-        private const float _scaleBy = 1.05f;
-
         public ZoomBehavior(Diagram diagram) : base(diagram)
         {
             Diagram.Wheel += Diagram_Wheel;
@@ -18,9 +16,11 @@ private void Diagram_Wheel(WheelEventArgs e)
             if (!Diagram.Options.Zoom.Enabled)
                 return;
 
+            var scale = Math.Clamp(Diagram.Options.Zoom.ScaleFactor, 1.01, 2);
+
             var oldZoom = Diagram.Zoom;
             var deltaY = Diagram.Options.Zoom.Inverse ? e.DeltaY * -1 : e.DeltaY;
-            var newZoom = deltaY > 0 ? oldZoom * _scaleBy : oldZoom / _scaleBy;
+            var newZoom = deltaY > 0 ? oldZoom * scale : oldZoom / scale;
 
             if (newZoom < 0)
                 return;

diff --git a/src/Blazor.Diagrams.Core/DiagramOptions.cs b/src/Blazor.Diagrams.Core/DiagramOptions.cs
@@ -55,6 +55,8 @@ public class DiagramZoomOptions
         public double Minimum { get; set; } = 0.1;
         [Description("Maximum value allowed")]
         public double Maximum { get; set; } = 2;
+        [Description("Zoom Scale Factor. Should be between 1.01 and 2.  Default is 1.05.")]
+        public double ScaleFactor { get; set; } = 1.2;
     }
 
     public class DiagramGroupOptions