Lesson Eleven Moving Backgrounds

Skills

Create a new project Title it Lesson 11 Delete the cat!

Bring in the hippo, cloud, and building

Create a blue sky for your backdrop

Start with your building The costumes are actually different buildings, so we can use this to give the illusion of many sprites

Start by setting your building’s x-coordinate to 250 This positions the building to start on the far right corner

To create the moving effect, the building will move across the screen. The number of repeats just needs to be enough to make it move to the far left corner If we change x by -5, it will slowly move to the left across the screen

To get the building to start back on the right side again, add a forever loop

Then add a costume change so that it will seem like different buildings

It should now look like this

Can you make it scroll across? Now try the cloud. Can you make it scroll across?

One starting point is to simply duplicate the code… but what’s the problem?

The cloud doesn’t have a costume change, so we could start by deleting that code Although making new costumes for the cloud would be a great way to improve this game later 

I used -10 to make the clouds move twice as fast Change the value for change x by so that the cloud won’t be synced to the movement of the building I used -10 to make the clouds move twice as fast

Now your cloud is getting stuck for a few seconds on the left. Change to 50 repeats to fix this

Now add code to randomize the cloud’s spot on the y-axis 200 to -200 covers most of the screen

It should now look like this

Program the arrow keys to move our hippo The next costume code will cause his wings to flap when he is moved

Program your hippo’s start and directions Did you notice he was flying behind the buildings? This will fix that.

Create a variable for hits Click here

Add code to track the hits and to cause the hippo to react when it touches a cloud Restarts the score Creates trigger if hippo touches cloud Need a forever loop for it to constantly be checking Increases # of hits Causes hippo to change colors Need a wait or else hippo will rack up multiple hits while still touching cloud Resets the hippo’s color

The hippos says “Watch out for clouds” for 2 seconds, so add a 2 second wait for the cloud and the building

The hippos says “Watch out for clouds” for 2 seconds, so add a 2 second wait for the cloud and the building

Your Turn! Make your own game with a moving background Must have at least two sprites that move in the background Another sprite must need to dodge something Must use a variable BONUS: Can you program it so that the background only moves when you press your arrow keys? Submit to Lesson 11 in the class studio.

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