Added "Speed at Periapsis" and "Speed at Apoapsis" readouts to Orbital section (not default)
[VesselSimulator.git] / KerbalEngineer / Flight / Readouts / Orbital / SpeedAtApoapsis.cs
blob:a/KerbalEngineer/Flight/Readouts/Orbital/SpeedAtApoapsis.cs -> blob:b/KerbalEngineer/Flight/Readouts/Orbital/SpeedAtApoapsis.cs
--- a/KerbalEngineer/Flight/Readouts/Orbital/SpeedAtApoapsis.cs
+++ b/KerbalEngineer/Flight/Readouts/Orbital/SpeedAtApoapsis.cs
@@ -1,1 +1,68 @@
+// 
+//     Kerbal Engineer Redux
+// 
+//     Copyright (C) 2014 CYBUTEK
+// 
+//     This program is free software: you can redistribute it and/or modify
+//     it under the terms of the GNU General Public License as published by
+//     the Free Software Foundation, either version 3 of the License, or
+//     (at your option) any later version.
+// 
+//     This program is distributed in the hope that it will be useful,
+//     but WITHOUT ANY WARRANTY; without even the implied warranty of
+//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//     GNU General Public License for more details.
+// 
+//     You should have received a copy of the GNU General Public License
+//     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+// 
 
+#region Using Directives
+
+using System;
+using KerbalEngineer.Flight.Sections;
+using KerbalEngineer.Helpers;
+using KerbalEngineer.Extensions;
+
+#endregion
+
+namespace KerbalEngineer.Flight.Readouts.Orbital
+{
+    public class SpeedAtApoapsis : ReadoutModule
+    {
+        #region Constructors
+
+        public SpeedAtApoapsis()
+        {
+            this.Name = "Speed at Apoapsis";
+            this.Category = ReadoutCategory.GetCategory("Orbital");
+            this.HelpString = "Shows the orbital speed of the vessel when at apoapsis, the highest point of the orbit.";
+            this.IsDefault = false;
+        }
+
+        #endregion
+
+        #region Methods: public
+
+        public override void Draw(SectionModule section)
+        {
+            // Vis-viva: v^2 = GM(2/r - 1/a)
+            // All this is easily got from the ships orbit (and reference body)
+            String str;
+            Orbit orbit = FlightGlobals.ship_orbit;
+            if (orbit.eccentricity > 1.0)
+                str = "---m/s";
+            else
+            {
+                double speedsqr = orbit.referenceBody.gravParameter * ((2 / orbit.ApR) - (1 / orbit.semiMajorAxis));
+                if (Double.IsNaN(speedsqr) || speedsqr < 0)
+                    str = "---m/s";     // Don't think this is possible barring bugs in the Orbit class
+                else
+                    str = Math.Sqrt(speedsqr).ToSpeed();
+            }
+            this.DrawLine(str, section.IsHud);
+        }
+
+        #endregion
+    }
+}