Hello fellow jumping enthusiasts. Today we're going to give our little guy hops like Jordan.

At the top of the file we have some constants:

SPEED = 7
GRAVITY = 3
JUMP_POWER = 17
FLOAT_FACTOR = 0.4

Take a minute and play around with those values. See if you can find the 'Space Jam' setting.

This looks a bit complicated but bear with me. Getting the Mario-striving-for-the-top-of-his-jump effect is a bit trickier than you might think. Look below

self.bind 'step', ->

We're reducing the effect of gravity when jumping,

if jumping
  I.velocity.y += float_acc

applying it normally when falling,

else if falling
  I.velocity.y += acc

and if you are neither jumping nor falling and pressing the jump key, we're telling the game that you are now jumping.

else if keydown.z
  jumping = true
  I.velocity.y = -JUMP_POWER

Each step we also set jumping to false if the jump key isn't held.

jumping = false unless keydown.z

Finally, we do a simple check to make sure the player lands on the ground and we tell the game he isn't falling anymore.

if I.y > FLOOR_HEIGHT - 25
  I.y = FLOOR_HEIGHT - 25
  falling = false
else
  falling = true

We're going to teach the square to shoot in the eagerly anticipated lesson three: Pew