VisualMelon · SADASHIMA · Oct 3, 2024
diff --git a/Source/Examples/ExampleLibrary/Series/PolygonSeriesExamples.cs b/Source/Examples/ExampleLibrary/Series/PolygonSeriesExamples.cs
@@ -80,5 +80,26 @@ private static DataPoint[] RegularPolygon(DataPoint center, double dimension, in

            return res;
        }
+
+        [Example("WithoutColorAxis")]
+        [DocumentationExample("Series/PolygonSeries")]
+        public static PlotModel WithoutColorAxis()
+        {
+            var model = new PlotModel { Title = "Without ColorAxis", PlotType = PlotType.Cartesian };
+
+            model.Axes.Add(new LinearAxis());
+
+            var ps = new PolygonSeries();
+            var outlines = new List<DataPoint[]>();
+            for (int i = 0; i < 5; i++)
+            {
+                ps.Items.Add(new PolygonItem(RegularPolygon(new DataPoint(i * 5, 0), 2, 3 + i), i));
+                outlines.Add(RegularPolygon(new DataPoint(i * 5, 5), 2, 3 + i));
+            }
+            ps.Items.Add(new PolygonItem(outlines, 10));
+            model.Series.Add(ps);
+
+            return model;
+        }
    }
 }
diff --git a/Source/OxyPlot/Series/PolygonSeries.cs b/Source/OxyPlot/Series/PolygonSeries.cs
@@ -40,6 +40,7 @@ public PolygonSeries()
            this.LabelFormatString = "0.00";
            this.LabelFontSize = 0;
            this.Stroke = OxyColors.Undefined;
+            this.Fill = OxyColors.Undefined;
            this.StrokeThickness = 2;
        }

@@ -101,6 +102,12 @@ public PolygonSeries()
        /// <value>The stroke.</value>
        public OxyColor Stroke { get; set; }

+        /// <summary>
+        /// Gets or sets the fill color of the polygon.
+        /// </summary>
+        /// <value>The fill color.</value>
+        public OxyColor Fill { get; set; }
+
        /// <summary>
        /// Gets or sets the stroke thickness. The default is <c>2</c>.
        /// </summary>
@@ -214,7 +221,11 @@ protected void RenderPolygons(IRenderContext rc, ICollection<PolygonItem> items)

            foreach (var item in items)
            {
-                var polyColor = this.ColorAxis.GetColor(item.Value);
+                var polyColor = this.Fill.IsUndefined() ?
+                    this.ColorAxis?.GetColor(item.Value) ?? this.PlotModel.GetDefaultColor() :
+                    this.Fill.IsAutomatic() ?
+                        this.PlotModel.GetDefaultColor() :
+                        this.Fill;

                foreach (var outline in item.Outlines)
                {