Frogger - Part 3

In this section we will:
  • keep track of the number of frogger's Lives
  • stop all cars when the frogger dies.
  • start all cars when frogger is alive.
  • stop all cars when the finish area is reached (Level up!)
  • change the costume of the dead frogger
    (and change back when frogger is alive again!)
  • have cars change costumes with every teleport
  • add more cars on levels 3 and 6

You must complete
 Frogger - Part 2 
before starting here!
Scratch Cat (from http://nagelelo.wikispaces.com)

About these Tutorials

A brief explanation of ownership and rights is found here:  Script 1&2.  If you use these tutorials, please let me know.

About Scratch

Scratch is an entry-level  free and open source software programming environment developed by MIT.

Keeping track of Lives

... When is the Game Over?

This video shows a new way to communicate between scripts using:
Picture
We haven't made a "broadcast" before, so, you'll need to get them from the Control palette.
on youtube
BEWARE: There's a strange TYPO in the code of this video (#14).  
Can you find it before the next video?

Stop the Cars!
 Frogger has died!


Everyone knows that the game should stop when the frogger dies.  So, let's make that happen.

We've already created a broadcast called "Died".

Now, let's go to first car (Blue Car) and include a stopping script.

When you've got the Blue Car working, why not just drag that piece of script onto the other cars!
on youtube
             BEWARE:  Making this script work will have unintended side-effects!


Oh no!  The cars are not moving!



Well, we thought this was a great idea to have the cars stop when the frogger died.

But now, we've created another problem.

The best part is that our solution is simple and will save us work later!
on youtube

Stop Cars on "Level Up"


If the cars can stop moving when the frogger dies, shouldn't they also stop when the frogger reaches the finish area?
on youtube

Adding visual effects



What does a dead frogger look like?

Hmmmmm....

Add a new costume.

Switch to the right costume at the right time.
on youtube

Changing  
   Costume on 
       Teleport



If the frogger can change costumes, then why can't the cars?

If the car changes costume when it's teleporting, then we can pretend that there's lots more cars on the road.
on youtube

Add Cars on 
   Levels 3 & 6


I've had a number of questions about adding more cars.  Well, it's time!

Duplicate a car in the slow lane.

Then, when the green flag is clicked, choose "HIDE".

Then, when the Level is right, choose "SHOW".

Sounds simple, right?
on youtube




When you are completely done, the teacher will instruct you to click here.