Updates for Example Sims (#655)

* Move integloop initialization from input file to S_defines create_connections routine

* Add README.md to describe the ball sims.

trick_sims/Ball/README.md

@@ -0,0 +1,51 @@
+# Ball Sims
+
+## SIM\_ball\_L1
+
+This is a simulation of a ball under the influence of a force field. 
+The force on the ball is of constant magnitude, and always directed
+toward a fixed point.
+
+![Picture of Sun](images/Ball_L1.png)
+
+#### Inputs
+|   Parameter                  | Units | Default |
+|:---------------------------- |:-----:|:-------:|
+| ball.force.input.origin[2]   |   m   | { 0.0, 2.0 } |
+| ball.force.input.force       |   N   |   8.0   |
+| ball.state.input.mass        |   kg  |   10.0  |
+| ball.state.input.speed       |  m/s  |   2.0   |
+| ball.state.input.elevation   |  rad  |   45 ° x (180/π)  |
+| ball.state.input.position[2] |   m   | { 5.0, 5.0 }  |
+
+#### Outputs
+|   Parameter                       | Units |
+|:--------------------------------- |:-----:|
+| ball.state.output.position[2]     |   m   |
+| ball.state.output.velocity[2]     |   m   |
+| ball.state.output.acceleration[2] |   m   |
+
+
+## SIM\_ball\_L2
+
+This simulation is a derivation of SIM\_ball\_L1. It uses Trick "dynamic-events" to simulate walls, off of which the ball can bounce.
+
+![Picture of Sun](images/Ball_L2.png)
+
+#### Inputs 
+*(In addition to those of SIM\_ball\_L1)*
+These parameters define the coordinates of the walls.
+
+|   Parameter                         | Units | Default |
+|:----------------------------------- |:-----:|:-------:|
+| ball.force.input.floor\_y\_pos      |   m   |  -10.0  |
+| ball.force.input.right_wall\_x\_pos |   m   |   10.0  |
+| ball.force.ceiling\_y\_pos          |   m   |   10.0  |
+| ball.force.left_wall\_x\_pos        |   m   |  -10.0  |
+
+The outputs are the same as those of SIM\_ball\_L1.
+
+
+## SIM\_ball\_L3
+
+This simulation is a derivation of SIM\_ball\_L2. The SIM\_ball\_L3 S_define instanciates two ballSimObject's rather than just one.

trick_sims/Cannon/SIM_cannon_numeric/RUN_graphics/input.py

@@ -1,7 +1,5 @@
 execfile("Modified_data/realtime.py")
 
-dyn_integloop.getIntegrator(trick.Runge_Kutta_4, 5)
-
 #==========================================
 # Start the Cannonball Graphics Client
 #==========================================

trick_sims/Cannon/SIM_cannon_numeric/RUN_test/input.py

@@ -1,5 +1,2 @@
-
 execfile("Modified_data/realtime.py")
 execfile("Modified_data/cannon.dr")
-
-dyn_integloop.getIntegrator(trick.Runge_Kutta_4, 5)

trick_sims/Cannon/SIM_cannon_numeric/S_define

@@ -29,3 +29,7 @@ class CannonSimObject : public Trick::SimObject {
 CannonSimObject dyn ;
 
 IntegLoop dyn_integloop (0.01) dyn;
+
+void create_connections() {
+    dyn_integloop.getIntegrator(Runge_Kutta_4, 5);
+}