INQ241B
Mobile Apps

Senses

• Can get keyboard presses (if on a computer instead of a mobile device)

  senses → on key pressed("right") do
    sprite → move(10, 0)
  end

• Put the keyboard key inside the quotes

• Can get accelerometer input

  board  → on every frame do
     var acc := senses  → acceleration quick
     sprite → set speed(acc → x * 100, acc → y * 100)
  end

• The acc variable is a vector with x and y components that are numbers between 0 and 1 that represent the amount of device tilt in the x and y directions

Swipe Input

• In addition to taps, can get swipes

  sprite → on swipe(swiped)
    where swiped(x: Number, y: Number, delta x: Number, delta y: Number is
      sprite → set speed(delta x * 10, delta y * 10)
    end
  end

• x and y are the location of the start of the swipe

• delta x and delta y are the direction and speed of the swipe

Score, Lives, and Timer

• Can change score (number at the top of the window)

  game → add score(1)
  game → set score(0)

• Set the score to negative to hide it

• Can change number of lives (hearts at the top of the window)

  game → add life(1)
  game → remove life(1)
  game  → set life(0)

• When there are 0 lives the game automatically ends

• If not using the lives, can hide them

  game → set life visible(false)

• Can add a countdown timer
• Counts down to zero

• The game automatically ends when timer reaches zero

  game → start countdown timer(30)

• Can add time by starting the timer again with more time

  game → start countdown timer(game → current time + 10)

Obstacle

• In addition to sprites, can add obstacles, lines, that sprites can interact with

  var obstacle := board → create obstacle(0, 0, 100, 100, 1)

• First two numbers are the x and y coordinates of one endpoint
• Second two numbers are the distance right and down of the second end point

• The last number is the elasticity, the amount a sprite bounces when it hits

No Quiz

Activity

• Activity 10