create/fix player abilities: wall jump, shooting, air dash

[olav-valle]

Jump

• [ ] Fix jump. Current jump feels floaty, and is also completely binary. Jump height should correspond to length of time that jump button is held. Short jump for quick tap, tall jump for hold. Solutions: -[x] Change jump to use addForce instead of velocity. This will probably get us most of the way there.

  • If jump uses addForce, tying jump height to input should be as simple as applying force while jump is held, up to a certain y-direction speed or a certain duration? Jump held == ctx.performed? Or ctx.time <= jumpAirTime?

• [ ] 0 x input in air should cause slow drift, not immediate stop. Both when 0 input is a result of opposite cardinal input, and no actual input at all.

  • [ ] One suggestion is to add a clamp to velocities: stackoverflow link

Air Jump

• fix reset of jump charge pickups when player touches ground.

[olav-valle]

Shooting

Change shooting to fire a projectile in a straight line, instead of a bouncy one.

[olav-valle]

Wall Jump

• [x] Implement wall jump.

• [x] Implement wall slide and/or grab

  • Needs more robust implementation
  • Add grace period for wall jump input after changing input away from wall.
  • Ignore x-axis movement input while wall grab is active, but still allow jump.
    • Ignore input toward wall for a short grace period after jump, to ensure that player clears the wall.

• Grab:

  • First set y-velocity to 0
  • and gravity to 0, while button is held
  • reset gravity the instant button is released or !touchingWall
  • ignore x-input away from wall while grabbing. This will let us prepare for a wall jump by first holding movement away from the wall, and then pressing jump when we're ready.
  • This would be a better implementation than having to perfectly time input direction switching and jump input to execute a wall jump.

• Slide:

  • Ensure a max absolute y velocity when x-input is against wall, to simulate sliding.

• Wall jump should work as long as any x-axis input is held, regardless of direction. This is how it seems to work in Celeste, and it makes chaining wall jumps feel really smooth.

[olav-valle]

Air Dash

[olav-valle]

Movement

• [ ] movement slowdown on 0 x-input needs to be fixed. Currently different implementations on no input and SOCD.

[olav-valle]

Split into issues #42 #43 #44