Added customizable pen colors

New node property, penColor, is null by default; this means that color
will be picked using the existing plotColorPalette method.
New node context menu item, Pen color, lets user choose the color to be
used when plotting this particular node.
This property is also saved/loaded from settings based on sensor
identifier.

GUI/HardwareNode.cs

@@ -89,6 +89,8 @@ namespace OpenHardwareMonitor.GUI {
         ((SensorNode)node.Nodes[i]).Sensor.Index < sensor.Index)
         i++;
       SensorNode sensorNode = new SensorNode(sensor, settings, unitManager);
+      if (settings.Contains(sensor.Identifier + "/PenColor"))
+        sensorNode.penColor = settings.GetValue(sensor.Identifier + "/PenColor", Color.Black);
       sensorNode.PlotSelectionChanged += SensorPlotSelectionChanged;
       node.Nodes.Insert(i, sensorNode);
     }

GUI/MainForm.Designer.cs

@@ -111,6 +111,7 @@ namespace OpenHardwareMonitor.GUI {
       this.log1hMenuItem = new System.Windows.Forms.MenuItem();
       this.log2hMenuItem = new System.Windows.Forms.MenuItem();
       this.log6hMenuItem = new System.Windows.Forms.MenuItem();
+      this.colorDialog = new System.Windows.Forms.ColorDialog();
       this.splitContainer.Panel1.SuspendLayout();
       this.splitContainer.SuspendLayout();
       this.SuspendLayout();
@@ -762,6 +763,7 @@ namespace OpenHardwareMonitor.GUI {
     private System.Windows.Forms.MenuItem log1hMenuItem;
     private System.Windows.Forms.MenuItem log2hMenuItem;
     private System.Windows.Forms.MenuItem log6hMenuItem;
+    private System.Windows.Forms.ColorDialog colorDialog;
   }
 }
 

GUI/MainForm.cs

@@ -494,8 +494,10 @@ namespace OpenHardwareMonitor.GUI {
         SensorNode sensorNode = node.Tag as SensorNode;
         if (sensorNode != null) {
           if (sensorNode.Plot) {
-            colors.Add(sensorNode.Sensor,
+            if (sensorNode.penColor == null) {
-              plotColorPalette[colorIndex % plotColorPalette.Length]);
+              colors.Add(sensorNode.Sensor,
+                plotColorPalette[colorIndex % plotColorPalette.Length]);
+            }
             selected.Add(sensorNode.Sensor);
           }
           colorIndex++;
@@ -509,6 +511,7 @@ namespace OpenHardwareMonitor.GUI {
       // from the plot
       var usedColors = new List<Color>();
       foreach (var curSelectedSensor in selected) {
+        if (!colors.ContainsKey(curSelectedSensor)) continue;
         var curColor = colors[curSelectedSensor];
         if (usedColors.Contains(curColor)) {
           foreach (var potentialNewColor in plotColorPalette) {
@@ -523,6 +526,12 @@ namespace OpenHardwareMonitor.GUI {
         }
       }
 
+      foreach (TreeNodeAdv node in treeView.AllNodes) {
+        SensorNode sensorNode = node.Tag as SensorNode;
+        if (sensorNode != null && sensorNode.Plot && sensorNode.penColor != null)
+          colors.Add(sensorNode.Sensor, sensorNode.penColor.Value);
+      }
+
       sensorPlotColors = colors;
       plotPanel.SetSensors(selected, colors);
     }
@@ -673,6 +682,18 @@ namespace OpenHardwareMonitor.GUI {
             treeContextMenu.MenuItems.Add(item);
           }
           treeContextMenu.MenuItems.Add(new MenuItem("-"));
+          {
+            MenuItem item = new MenuItem("Pen color");
+            item.Click += delegate(object obj, EventArgs args) {
+              colorDialog.Color = node.penColor.GetValueOrDefault();
+              if (colorDialog.ShowDialog() == DialogResult.OK) {
+                node.penColor = colorDialog.Color;
+                settings.SetValue(node.Sensor.Identifier + "/PenColor", colorDialog.Color);
+                PlotSelectionChanged(this, null);
+              }
+            };
+            treeContextMenu.MenuItems.Add(item);
+          }
           {
             MenuItem item = new MenuItem("Show in Tray");
             item.Checked = systemTray.Contains(node.Sensor);

GUI/MainForm.resx

@@ -129,6 +129,9 @@
   <metadata name="timer.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
     <value>293, 17</value>
   </metadata>
+  <metadata name="colorDialog.TrayLocation" type="System.Drawing.Point, System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a">
+    <value>483, 17</value>
+  </metadata>
   <assembly alias="System.Drawing" name="System.Drawing, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
   <data name="$this.Icon" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
     <value>

GUI/SensorNode.cs

@@ -9,6 +9,7 @@
 */
 
 using System;
+using System.Drawing;
 using System.Collections.Generic;
 using OpenHardwareMonitor.Hardware;
 using OpenHardwareMonitor.Utilities;
@@ -21,6 +22,7 @@ namespace OpenHardwareMonitor.GUI {
     private UnitManager unitManager;
     private string format;
     private bool plot = false;
+    public Color? penColor = null;
 
     public string ValueToString(float? value) {
       if (value.HasValue) {

OpenHardwareMonitor.csproj

@@ -66,6 +66,7 @@
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.Configuration.Install" />
+    <Reference Include="System.Data" />
     <Reference Include="System.Drawing" />
     <Reference Include="System.Management" />
     <Reference Include="System.Windows.Forms" />