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Thoughts

Advantages:

  • current design has alerts fired when certain events occur. There can be multiple alerts per interaction which can cause a number of issues:
    • alerts can pile up especially if user interacts rapidly
    • may not be relevant by the time alerts are delivered
    • sonification and screen reader responsiveness may not be in sync
  • Using a pick-up and release interaction would simplify text alerts:
    • there would only be 2 alerts per interaction
    • better control over relevance as the alerts occur at predictable times

Disadvantages:

  • Adds another step to the interaction.

PDOM

Faraday's Law (h2, Scene Summary)

One CoilTwo Coils

"Faraday's Law‬ is an interactive sim. It changes as you play with it.

At the centre of the play area is a coil connected to a light bulb circuit. There is a also moveable bar magnet.

Grab the magnet to play.

Additional controls that change what is connected to the circuit, flip the bar magnet, and reset the sim. If needed, check out keyboard shortcuts under Sim Resources."

"Faraday's Law‬ is an interactive sim. It changes as you play with it.

At the centre of the play area are two coils connected to a light bulb circuit. There is a also moveable bar magnet.

Grab the magnet to play.

Additional controls that change what is connected to the circuit, flip the bar magnet, and reset the sim. If needed, check out keyboard shortcuts under Sim Resources."

Play Area (h2)

Light Bulb Circuit (h3)

In the circuit are a:

  • 4 loop coil
  • 2 loop coil (if attached)
  • a light bulb
  • a voltmeter (if attached)

The coil is sideways, with openings on the left and right.

Bar Magnet (h3)

The bar magnet left of 2 loop coil, far from 4 loop coil below. (First sentence in this description is the same as Magnet Release Text Alerts (see below), except the word "Released" is replaced with "The bar magnet".)

North pole on left. South pole on right. (Polarity according to whether or not it's flipped).

Field Lines (h3)

One CoilTwo CoilsField strength values
The magnet field strength is (field strength) at the 4 loop coil.

The magnet field strength is:

  • (field strength) at the 4 loop coil
  • (field strength) at the 2 loop coil

Very strong

Strong

Weak

Controls Area (h2)

  • Button
    • Label: "Grab magnet"
    • Aria description: "Select this to move the magnet."
  • Checkbox
    • Label: "Voltmeter"
    • Aria description: "Play with or without voltmeter connected to light bulb circuit"
  • Checkbox
    • Label: "Field Lines"
    • Aria description: "Hide or show magnetic field lines."
  • Circuit mode
    • Aria description: "Experiment with one or two coils."
    • Radio button group
      • (Radio) 1 coil
      • (Radio) 2 coils
  • Button
    • Label: "Flip magnet"
    • Aria description: "Flip North and South Poles"
  • Button
    • Label: "Reset All"

Text Alerts

EventAlert text
Grab magnet: 1st and 2nd time"Grabbed, W A S D keys move in 4 directions. Press Space to release."
Grab magnet: 3rd - 5th time"Grabbed, try 1 2 3 keys to slide different speeds left and right. Press Space to release."
Grab magnet: 6th time"Grabbed, also see keyboard shortcuts under Sim Resources. Press Space to release."
Grab magnet: 7th time"Grabbed. Press Space to release."
Release magnet"(Magnet Release Text Alert)" See below.
Bump Coil"Bumped coil"
Bump Edge"At edge of play area." or "Magnet at edge of play area"

Magnet Release Text Alerts

The following diagram depicts the different text alerts fired when the magnet is released.

Unlike previous designs (and implementations), the alert strings are static and depends only on the location of the magnet in the play area when released.

The key implementation detail is being able to determine the center of the 4 loop coil, and boundaries of the two coils so the different regions can be defined.

Example Text Alert Interaction

First and Second time interacting (WASD Prompt)

  • Pressed tab.
    • Focus moved to magnet
    • Screen reader would announce focus and associated aria-describedby text.
  • Press enter.
    • Text alert: "Grabbed, W A S D keys move in 4 directions. Press Space to release."
  • 1 2 3, or cursor keys pressed
    • Sonification sounds are heard
    • Bump Coil and Bump Edge alerts fired if occurred.
    • Changes to PDOM descriptions occur as interaction proceeds.
  • Press space.
    • Text alert: "(Magnet Release Text Alert)" See above.
    • Keyboard focus is on magnet button.
  • If Tab is pressed
    • (question) What should happen if Tab were pressed before release? Does focus move and the magnet released?

Third to Fifth time interacting (Slide Prompt)

  • Pressed tab.
    • Focus moved to magnet
    • Screen reader would announce focus and associated aria-describedby text.
  • Press enter.
    • Text alert: "Grabbed try 1 2 3 keys slide different speeds left and right. Press Space to release."
  • 1 2 3, or cursor keys pressed
    • Sonification sounds are heard
    • Bump and Play Edge alerts fired if occurred.
    • Changes to PDOM descriptions occur as interaction proceeds.
  • Press space.
    • Text alert: "(Magnet Release Text Alert)" See above.
    • Keyboard focus is on magnet button.
  • If Tab is pressed
    • (question) What should happen if Tab were pressed before release? Does focus move and the magnet released?

Sixth time onwards (Shortened Grab Alert)

  • Pressed tab.
    • Focus moved to magnet
    • Screen reader would announce focus and associated aria-describedby text.
  • Press enter.
    • Text alert: "Grabbed. Press Space to release."
  • 1 2 3, or cursor keys pressed
    • Sonification sounds are heard
    • Bump and Play Edge alerts fired if occurred.
    • Changes to PDOM descriptions occur as interaction proceeds.
  • Press space.
    • Text alert: "(Magnet Release Text Alert)" See above.
    • Keyboard focus is on magnet button.
  • If Tab is pressed
    • (question) What should happen if Tab were pressed before release? Does focus move and the magnet released?


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