Vehicles and Conditionals

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Vehicles and Conditionals

• By Henry Qin, edited and revised by Ruthie
  Tucker, under the direction of Professor Susan
  Rodger, Duke University 2008

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Getting Started

• To build this world, we will need a vehicle and a
  person. I am using the Humvee and Euripides. You
  can use whichever characters you would like.

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Getting Started

• We are going to make several events in this
  world.
• The mouse will move both your vehicle and your
  person separately.
• When you click on the T key the mouse should
  move both of them together, as if they were glued
  together.
• We will then create a second world that uses the
  T key to control the camera.

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World.ChangeVehicle

• First we will need to create a new method, called
  world.changevehicle.

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World.ChangeVehicle

• Now we need to drag an if statement into the
  newly created method.

• Now we want to make the world do something if
  Euripides is set as a vehicle to the Humvee.

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World.ChangeVehicle

• Now if the condition is true we will set
  Euripides vehicle to the entire world.

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World.ChangeVehicle

• Else the vehicle for Euripides will be set to the
  Humvee.

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World.ChangeVehicle

• Now we need to implement some events
• The first event we need is let the mouse move.

• We need to create a new variable to place in the
  space of Any Object.

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Creating more events

• Now we need another event to implement our method
  to make Euripides and the Humvee move together.

• Create a new event labeled when a key is typed
  and select the letter T.

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Creating the Events

• Now we can implement our Change Vehicle method.

• This will make Euripides and the Humvee move
  together.

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Finishing Up Part One

• Now try playing your world.
• First click on Euripides and the Humvee and see
  if they move separately

• Now move Euripides on top of the Humvee and hold
  down the T key.
• Now when you click on the Humvee Euripides should
  move with it.

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Adding Camera Control
In order to do the final part we will need to
start a new world that has the same objects in it
as before. See below.
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Adding Camera Control
Once you have added your objects, put Euripides
on the Humvee and set him as a vehicle to the
Humvee.
Now create an event using the arrow keys to drive
the Humvee.
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Adding Camera Control
Now we want to create a new world level method
labeled just like the old one, World.ChangeVehicl
e.
Now lets place an if/else statement inside our
new method.
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Adding Camera Control
Now set the camera's vehicle to the Humvee in the
if statement.
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Adding Camera Control
We want the Camera to be set as a vehicle to the
world if the statement is true. Else it should be
set to the Humvee.
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Adding the Final Event
Go to the events editor and add a second event
that involves pressing the T key.
In the Do Nothing category add
World.ChangeVehicle.
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Testing the World
Now try playing your world. The arrow keys should
move the Humvee with Euripides attached to it.
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Finishing Up
Now hit the T key and try moving your arrow
keys again. This time the camera should follow
your Humvee while you move around.
That's all folks!