Merge pull request #1128 from EmanuelFeru/master

Implemented Step Signal Plot
ScottPlot · Jul 24, 2021 · d1ace02 · d1ace02
2 parents 3ead8c2 + 5c0884b
commit d1ace02
Show file tree

Hide file tree

Showing 2 changed files with 42 additions and 0 deletions.
diff --git a/src/ScottPlot/Plottable/SignalPlotBase.cs b/src/ScottPlot/Plottable/SignalPlotBase.cs
@@ -20,6 +20,7 @@ public abstract class SignalPlotBase<T> : IPlottable, IHasPointsGenericX<double,
         public int XAxisIndex { get; set; } = 0;
         public int YAxisIndex { get; set; } = 0;
         public bool IsVisible { get; set; } = true;
+        public bool StepDisplay { get; set; } = false;
         public float MarkerSize { get; set; } = 5;
         public double OffsetX { get; set; } = 0;
         public T OffsetY { get; set; } = default;
@@ -275,6 +276,9 @@ private void RenderLowDensity(PlotDimensions dims, Graphics gfx, int visibleInde
                 PointF[] pointsArray = linePoints.ToArray();
                 ValidatePoints(pointsArray);
 
+                if (StepDisplay)
+                    pointsArray = GetStepPoints(pointsArray);
+
                 if (penLD.Width > 0)
                     gfx.DrawLines(penLD, pointsArray);
 
@@ -309,6 +313,25 @@ private void RenderLowDensity(PlotDimensions dims, Graphics gfx, int visibleInde
             }
         }
 
+        /// <summary>
+        /// Convert scatter plot points (connected by diagnal lines) to step plot points (connected by right angles)
+        /// by inserting an extra point between each of the original data points.
+        /// </summary>
+        private PointF[] GetStepPoints(PointF[] pointsArray)
+        {
+            PointF[] pointsStep = new PointF[pointsArray.Length * 2 - 1];
+
+            for (int i = 0; i < pointsArray.Length - 1; i++)
+            {
+                pointsStep[i * 2] = pointsArray[i];
+                pointsStep[i * 2 + 1] = new PointF(pointsArray[i + 1].X, pointsArray[i].Y);
+            }
+
+            pointsStep[pointsStep.Length - 1] = pointsArray[pointsArray.Length - 1];
+
+            return pointsStep;
+        }
+
         private class IntervalMinMax
         {
             public float x;

diff --git a/src/cookbook/ScottPlot.Cookbook/Recipes/Plottable/Signal.cs b/src/cookbook/ScottPlot.Cookbook/Recipes/Plottable/Signal.cs
@@ -86,6 +86,25 @@ public void ExecuteRecipe(Plot plt)
         }
     }
 
+    public class CustomLineStep : IRecipe
+    {
+        public string Category => "Plottable: Signal Plot";
+        public string ID => "signal_step";
+        public string Title => "Step Display";
+        public string Description =>
+            "Signal plots can be styled as step plots where points " +
+            "are connected by right angles instead of straight lines.";
+
+        public void ExecuteRecipe(Plot plt)
+        {
+            double[] ys = DataGen.Sin(51);
+
+            var sig = plt.AddSignal(ys);
+            sig.StepDisplay = true;
+            sig.MarkerSize = 0;
+        }
+    }
+
     public class RandomWalk_5millionPoints_Signal : IRecipe
     {
         public string Category => "Plottable: Signal Plot";