Page 250 - Scratch Programming Playground

Save Point

Click the green flag to test the code so far. press the W key
to jump. Quickly pressing the key should cause a small jump.
holding down the W key should cause a higher jump. Make
sure the cat can jump only while it’s on the ground and can’t
do double jumps. then click the red stop sign and save your
program.
If you’re lost, open platformer4.sb in the resources ZIp file
and continue reading from this point.

D add ceiling detection

the cat can walk on the ground, and now walls will stop the
cat from moving through them. But if the player bumps the
Cat sprite’s head against a platform from below, the Cat sprite
will rise above it! to solve this problem, we need to make some
adjustments to the lifting code to add ceiling detection.

7. Add a Low Platform to the Ground Sprite

add a short, low platform to the Ground sprite’s costume, as
shown in the following figure. Make sure it is high enough for
the cat to walk under but low enough that the cat can jump up
and touch it.

224 Chapter 9