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Platformer Game

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Velocity

forever

move (velocity) steps

wait (vtime) seconds

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How would you add in a vertical velocity?

[This means only changes y coordinate.]

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Gravity

Add a variable: vertical velocity

If touching floor color

-- set vertical velocity to 0

else

-- change vertical velocity by gravity

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Glitches to Discuss

  • Character can't escape floor (stuck inside)�
  • Character falls deep into floor�
  • Character seems ok on platform, but falls too fast when it walks off the edge.

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Jumping

How do you jump?

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Slowing Down: Friction or Skid Stop

Ways to slow down:

  1. velocity = velocity - small number
  2. velocity = 0.99 * velocity

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Issues with #1: negative velocity doesn't work.

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Game Requirements

  • Platformer
  • Jump (no more than double jump)
  • Skid stop horizontally
  • Score, Win
  • Multiple Levels or Side Scrolling

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