2.7 Power up

Design

Objectives

set up power ups as well as a win loss system

Usability Features

Key Variables

Variable Name	Use
biggify	doubles the players size
smalify	returns the player back to normal

Pseudocode

Function big():
    Initialize timer as 0
    Initialize isBig as false
    
    Return an object with the following methods and properties:
    update():
        If isBig is true:
            Set CURRENT_JUMP_FORCE to BIG_JUMP_FORCE
            Decrease timer by the time elapsed since the last frame (dt())
            If timer is less than or equal to 0:
                Call the smallify() method

    isBig():
        Return the value of isBig

    smallify():
        Set the scale of the object to (1, 1)
        Set CURRENT_JUMP_FORCE to JUMP_FORCE
        Reset timer to 0
        Set isBig to false

    biggify(time):
        Set the scale of the object to (2, 2)
        Set timer to the given "time" value
        Set isBig to true



  
  

Development

Outcome

function big() {
    let timer = 0
    let isBig = false
    return {
      update() {
        if (isBig) {
          CURRENT_JUMP_FORCE = BIG_JUMP_FORCE
          timer -= dt()
          if (timer <= 0) {
            this.smallify()
          }
        }
      },
      isBig() {
        return isBig
      },
      smallify() {
        this.scale = vec2(1)
        CURRENT_JUMP_FORCE = JUMP_FORCE
        timer = 0
        isBig = false
      },
      biggify(time) {
        this.scale = vec2(2)
        timer = time
        isBig = true     
      }
    }

Challenges

setting a speed value that makes platforming smooth and movement feel responsive

Testing

Evidence for testing

Tests

Test	Instructions	What I expect	What actually happens	Pass/Fail
1	Interact with star	the player is twice as large	As expected	Pass

Evidence