added support for draggable axis line limits

ScottPlot · Jun 28, 2019 · 6af45af · 6af45af
1 parent 21fd691
commit 6af45af
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Showing 4 changed files with 19 additions and 8 deletions.
diff --git a/demos/ScottPlotDraggableMarkers/Form1.cs b/demos/ScottPlotDraggableMarkers/Form1.cs
@@ -29,20 +29,21 @@ private void Form1_Load(object sender, EventArgs e)
             scottPlotUC1.plt.AxisAuto();
             scottPlotUC1.Render();
             UpdateMessage();
+            BtnAddVline_Click(null, null);
         }
 
         private void BtnAddHline_Click(object sender, EventArgs e)
         {
             double position = rand.NextDouble() * 2 - 1;
-            scottPlotUC1.plt.PlotHLine(position, draggable: true);
+            scottPlotUC1.plt.PlotHLine(position, draggable: true, dragLimitLower: -1, dragLimitUpper: 1);
             scottPlotUC1.Render();
             UpdateMessage();
         }
 
         private void BtnAddVline_Click(object sender, EventArgs e)
         {
             double position = rand.NextDouble() * 50;
-            scottPlotUC1.plt.PlotVLine(position, draggable: true);
+            scottPlotUC1.plt.PlotVLine(position, draggable: true, dragLimitLower: 0, dragLimitUpper: 49);
             scottPlotUC1.Render();
             UpdateMessage();
         }

diff --git a/src/ScottPlot/MouseTracker.cs b/src/ScottPlot/MouseTracker.cs
@@ -64,6 +64,11 @@ public void MouseMove(Point eLocation)
                         axLine.position = newPosition.X;
                     else
                         axLine.position = newPosition.Y;
+
+                    if (axLine.position < axLine.dragLimitLower)
+                        axLine.position = axLine.dragLimitLower;
+                    else if (axLine.position > axLine.dragLimitUpper)
+                        axLine.position = axLine.dragLimitUpper;
                 }
             }
         }

diff --git a/src/ScottPlot/Plot.cs b/src/ScottPlot/Plot.cs
@@ -240,22 +240,22 @@ public void PlotBar(double[] xs, double[] ys, double? barWidth = null, double xO
         /// <summary>
         /// Plot a vertical line at the given X position
         /// </summary>
-        public void PlotVLine(double x, Color? color = null, double lineWidth = 1, string label = null, bool draggable = false)
+        public void PlotVLine(double x, Color? color = null, double lineWidth = 1, string label = null, bool draggable = false, double dragLimitLower = double.NegativeInfinity, double dragLimitUpper = double.PositiveInfinity)
         {
             if (color == null)
                 color = settings.GetNextColor();
-            PlottableAxLine axLine = new PlottableAxLine(x, vertical: true, color: (Color)color, lineWidth: lineWidth, label: label, draggable: draggable);
+            PlottableAxLine axLine = new PlottableAxLine(x, vertical: true, color: (Color)color, lineWidth: lineWidth, label: label, draggable: draggable, dragLimitLower: dragLimitLower, dragLimitUpper: dragLimitUpper);
             settings.plottables.Add(axLine);
         }
 
         /// <summary>
         /// Plot a horizontal line at the given Y position
         /// </summary>
-        public void PlotHLine(double x, Color? color = null, double lineWidth = 1, string label = null, bool draggable = false)
+        public void PlotHLine(double x, Color? color = null, double lineWidth = 1, string label = null, bool draggable = false, double dragLimitLower = double.NegativeInfinity, double dragLimitUpper = double.PositiveInfinity)
         {
             if (color == null)
                 color = settings.GetNextColor();
-            PlottableAxLine axLine = new PlottableAxLine(x, vertical: false, color: (Color)color, lineWidth: lineWidth, label: label, draggable: draggable);
+            PlottableAxLine axLine = new PlottableAxLine(x, vertical: false, color: (Color)color, lineWidth: lineWidth, label: label, draggable: draggable, dragLimitLower: dragLimitLower, dragLimitUpper: dragLimitUpper);
             settings.plottables.Add(axLine);
         }
 

diff --git a/src/ScottPlot/PlottableAxLine.cs b/src/ScottPlot/PlottableAxLine.cs
@@ -14,14 +14,19 @@ public class PlottableAxLine : Plottable
         public string orientation;
         public Pen pen;
         public bool draggable;
+        public double dragLimitLower;
+        public double dragLimitUpper;
 
-        public PlottableAxLine(double position, bool vertical, Color color, double lineWidth, string label, bool draggable)
+        public PlottableAxLine(double position, bool vertical, Color color, double lineWidth, string label,
+            bool draggable, double dragLimitLower, double dragLimitUpper)
         {
             this.position = position;
             this.vertical = vertical;
+            this.color = color;
             this.label = label;
             this.draggable = draggable;
-            this.color = color;
+            this.dragLimitLower = dragLimitLower;
+            this.dragLimitUpper = dragLimitUpper;
             orientation = (vertical) ? "vertical" : "horizontal";
             pen = new Pen(color, (float)lineWidth);
             pointCount = 1;