liitos

luennot/luento17/Liitos/Liitos.cs

@@ -4,19 +4,72 @@ using Jypeli.Controls;
 using Jypeli.Widgets;
 using System;
 using System.Collections.Generic;
+using FSJoint = FarseerPhysics.Dynamics.Joints.DistanceJoint;
+using FarseerPhysics.Factories;
+using FarseerPhysics.Dynamics;
+using Jypeli.Farseer;
+using Jypeli.Physics;
+using FarseerPhysics.Dynamics.Joints;
 
 public class Liitos : PhysicsGame
 {
+
+
+    public class AxleJoint : Jypeli.AxleJoint
+    {
+        
+        internal FSJoint InnerJoint
+        {
+            get
+            {
+                return (FSJoint)innerJoint;
+            }
+            set
+            {
+                innerJoint = value;
+            }
+
+        }
+        
+
+        /// <summary>
+        /// Luo uuden akseliliitoksen kahden olion välille.
+        /// </summary>
+        /// <param name="firstObject">Ensimmäinen olio</param>
+        /// <param name="secondObject">Toinen olio</param>
+        /// <param name="axlePosition">Liitoksen akselin paikka</param>
+        public AxleJoint(PhysicsObject firstObject, PhysicsObject secondObject, Vector axlePosition)
+            : base(firstObject, secondObject, axlePosition)
+        {
+            World world = PhysicsGame.Instance.Engine as World;
+            var first = firstObject.Body as PhysicsBody;
+            var second = secondObject.Body as PhysicsBody;
+            var ap2 = firstObject.Position + axlePosition - secondObject.Position;
+            InnerJoint = JointFactory.CreateDistanceJoint(world,
+                first.FSBody, second.FSBody,
+                axlePosition * FSConvert.DisplayToSim, ap2 * FSConvert.DisplayToSim);
+                // axlePosition2 * FSConvert.DisplayToSim);
+            InnerJoint.DampingRatio = 0.5f;
+            InnerJoint.Frequency = 50;
+            //InnerJoint.Enabled = false;
+        }
+
+    }
+
+
     public override void Begin()
     {
         Level.Background.Color = Color.Black;
         var osa1 = new PhysicsObject(200, 30);
         osa1.MakeStatic();
+        osa1.AddCollisionIgnoreGroup(1);
         Add(osa1);
         var osa2 = new PhysicsObject(200, 30);
         osa2.Position = new Vector(osa1.Width, 0);
+        osa2.AddCollisionIgnoreGroup(1);
         Add(osa2);
         var liitos = new AxleJoint(osa1, osa2, new Vector(osa1.Width/2, 0));
+        liitos.Softness = 0;
         Add(liitos);
         Gravity = new Vector(0, -400);
     }