In this video you'll keep the lens
from describing anything but the model.
The code you created so far checks only to see
if the color the lens is touching
matches the color in any of the conditionals
or if then blocks.
That means if the backdrop for the sprite is purple
and the lens clicks on the backdrop,
the lens starts to say the text for the purple shirt.
This is a bug, or unexpected behavior in the code.
As a computer program gets longer
with more code and more if then decisions
even the most experienced computer scientists
are unable to predict every behavior that will happen
so they test their code often and tinker with it
to find and fix the bugs.
Fix this bug so the lens shows text
only when the model sprite is clicked.
Select the control menu, drag out an if then block
and place it around all if then blocks
that check the color being touched.
From the sensing menu drag out a touching block
and place it in the if then block.
Choose model from the drop down.
Now the code reads,
"If the lens is touching the model,
"then run the other if then blocks
that check the color and show text."
If the lens sprite is not touching the model sprite
the if then blocks never run at all.
Try it out.
Great, in this example, when the purple backdrop is clicked
the description for the shirt does not display.
When the model's purple shirt is clicked
the description does display.
Add a backdrop for your sprite too.
Lastly give the user of your project instructions
about how to explore.
Click the model sprite, use the when flag clicked block
and say blocks to introduce your project
and tell the user how it works.
Write your own introductory text.
This is just an example.
Now it's your turn.
Add an if touching model block
around all the color conditionals in your project
so that the lens does not describe the outfit
when the backdrop is clicked.
Add a backdrop to your project.
In the model sprite, add instructions that tell the user
how your program works.
