Patrol

Create a Patrol Bar 

Open up your Patrol Bar Object and create an Object Variable called direction

Make it a number variable

Make the number 0

Create a second Object Variable called Speed

Make it a number variable

Make the number 250

Create a new object

Name it Bar

Make sure the height is the same as the PatrolBar

Bring them both in your scene and make sure the Z order has the PatrolBar on top

Open your Bar

Open up Points

Add a Point at the end of your Bar

Name it BarEnd

Go to your events

We are going to change the direction variable so that one event makes the PatrolBar goes right and the other goes left

Condition 

PatrolBar Object Variable Value fir Direction is equal to 0

Action

We are going to add force at an angle so that it goes left and right

Object: PatrolBar

Add a force (angle)

Angle: -180 (we are going this so that the bar goes left, remember graphing? Right is positive and left is negative).

Speed: (PatrolBar.Variable(speed)) 

We are grabbing the object variable "Speed" that we created on the PatrolBar

Create a new event just like the first event but change the variable to 1 and make the angle 0 so the PatrolBar goes right when the variable changes to 1 

Now we are going to have the variable "Direction" change when it gets to the X position points we have set in our events

Condition

Object: Patrol Bar

X position

Less Than (we want less than  because once the PatrolBar comes to the end of the left side, we want it to switch variables and go right)

Bar.X()     

The Bar.X() is the origin in your points

Action

Object: PatrolBar

Change object variable value

Variable: Direction

Set to 0 (zero because we want it going right)

Now we want a second event that has the direction variable 1 make the PatrolBar go left

Condition: PatrolBar

X Position

Greater than Bar.PointX("End")

Remember we created teh End point in our Bar object?

Action

Object: PatrolBar

Change object variable direction and set to 1

So Variable 0 makes the PatrolBar go left (-180 degrees)

Once it gets to X position 0, the variable changes and goes right (0 degrees)

When the PatrolBar gets to the End point we created, the variable switches to 1

And on and on

When you test right now, nothing happens because we haven't added any force to make the PatrolBar move at the start of the scene

We want this to happen always so there will be no condition

Action

Object: PatrolBar

Add a force (angle)

Angle: PatrolBar.Direction  (You want to use the "Direction" Variable of PatrolBar to get the bar started)