UPDATE:
The instructions below are for the older Scratch 2.
For the newer Scratch 3 instructions, click here.

Frogger, Page 2

In this page, we will:
  • Duplicate cars into the other lanes
  • Fix these duplicated cars so that they stay in their new lanes.
Scratch Cat (from http://nagelelo.wikispaces.com)
You must complete
Frogger, Page 1 
before starting here!

New to Scratch 2?

If you haven't used Scratch 2 before, check out:

Duplicate to Make the Second Car

Object-oriented programming is great because everything is an object.  If you want another, just "duplicate" it.

But beware!  If you copy-and-paste, then this duplicate will do EXACTLY what the first one did ... and we don't want that!

So, what will we fix to make it work right?

First, let's change where the car starts, so fix both 
GO TO X __ Y __
Set these to where the car starts.

Second, if this new car is in the passing lane, so you can make this one go faster, or make the first car go slower.
Again, here are the code blocks, and you can watch the video to see where they go.
Picture
Click for larger image

Duplicate to Make the Third Car

THIS IS THE HARD ONE!!!

Making a car go in the other direction should be easy... but it's not!

Is your car doing the "jiggly dance"?
Don't panic!  Help is here!

First, just like the car above, make changes to the 
GO TO X __ Y __

Second, you need your car to go in the other direction (because it's on the other side of the highway).  
How do you do this?

  1. At the beginning of the code, set the car to point in the right direction.
    "Motion" palette 
    -> POINT IN DIRECTION
  2. To make the cars go right, we used
    "CHANGE X BY 3".
    Now we want to go left. Any ideas?
Again, here are the code blocks, and you can watch the video to see where they go.
Picture
Click for larger image

Duplicate to make the Fourth Car

By now, you should not need this video. But if you do, here it is.

ADVANCED
ADVANCED
ADVANCED
ADVANCED
ADVANCED
ADVANCED
ADVANCED
ADVANCED
ADVANCED
ADVANCED
ADVANCED

CLONE Cars for More Per Lane

Advanced topic if you want a challenge!

CLONE is one of the new features in Scratch 2.  
CLONE is awesome!

(The CLONE feature is not necessary in this Frogger game, so don't worry if you skip this video.)


Next:  Frogger (Page 3)
Up:     Return to Scratch 2 (Coding)