FIGURE

Seventy-eight figures of the kind found in solid-geometry problems. They move with the sound you play, but only in the parts that matter to the problem, such as a height or the position of a point.

https://figure-dipcv.netlify.app

Controls

To begin: “▶ Play the demo” in the middle starts the built-in track and the figures begin to move. Choose “● Use the microphone” to have them respond to the sound around you.
Tap and swipe: Tap the right half of the screen for the next figure and the left half to change the colours. Swipe sideways to move to the previous or next figure.
Menu: Tap the bottom edge of the screen to bring up the controls. HIDE returns to the figure alone.
About the figures: Ten groups: solids, sections and nets, projection, graphs and fields, curves and loci, lattices, counting and sequences, mechanics, light and shadow, vectors.
AUTO / ORDER: AUTO advances the figure every set number of beats. ORDER cycles through RANDOM and RANDOM+COLOR. In RANDOM no figure comes back until all have been shown; RANDOM+COLOR changes the colours as well.
COLOR: There are twelve colour schemes.
♡ / ♥ LIST: Mark the figures you like and see them in a list. You can copy their numbers in one go, and ♥ ONLY cycles through the marked figures alone. Marks are kept in this browser only.
FILE / MIC: An audio file of your own, or the microphone, can drive the figures too. The microphone level is set automatically; moving VOL switches it to manual.
REC: Records the moving figure, sound included, as a video. Press again to stop and save.
Keys: Space plays and stops, ← → move between figures, C changes the colours, F marks, I opens the index, M shows or hides the menu.
The interface is in English: All of the controls are labelled in English.

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