The Icon Set

Every built-in icon carries motion authored for that icon specifically. That is the difference between a motion icon and an icon with an animation applied to it: a trash can’s lid lifts off its hinge, a download arrow falls out of the tray and reappears above it, a signal meter lights from the handset outwards.

Actions

Icon	Motion
check	Draws itself on, with a small settle at the end so it lands rather than stops.
close	Rotates a half turn — which lands the cross back on itself — while both strokes wipe off and back on.
plus	A quarter turn with an overshoot. A plus is symmetric every 90°, so it can afford to.
menu	Morphs into a cross and back. Each bar spins about its own centre, then slides to the middle.
search	Sweeps the glass across the surface it is searching.
settings	The cog twists and returns. It is not rotationally symmetric, so it cannot stop part way round.
refresh	One full turn.
loader	Turns while its arc trims, so the ring appears to chase its own tail.
trash	The lid swings up off its left hinge while the bin shivers.
download	The arrow falls out of the tray, vanishes, and reappears above it.
upload	The same in reverse.
edit	The pencil writes while the line draws itself in underneath.
filter	Settles vertically, like something poured through it.
share	The links draw outwards and each node pops as the link reaches it.
copy	The front sheet slides off the back one and returns.
power	The stem draws, then the arc closes around it, then the whole thing pulses.

Objects

Icon	Motion
bell	Swings from its crown, with the clapper running a wider arc so it catches up late.
heart	A double thump on the rhythm of a real heartbeat.
star	Rocks and swells.
bookmark	Lifts and drops back with a bounce.
mail	The flap folds up about its crease.
message	Three dots bounce in sequence — the typing indicator.
user	A small nod.
home	The roof lifts and lands; the door draws itself in.
calendar	The hangers wobble while the body squashes.
lock	The shackle pops up, and the body jiggles as it drops back.
eye	Blinks — lid and pupil squash about the same line, held shut just long enough to read.
camera	The lens snaps shut and open while the body recoils.
location	Drops in from above and lands with a bounce.
clock	Both hands turn at a believable ratio: a minute for an hour.
cloud	Drifts.
sun	The rays turn 45° — which lands them exactly on themselves — while everything pulses.

Indicators

Icon	Motion
play	Dips and springs back.
pause	The two bars pulse out of step.
volume	The waves leave the cone in order.
wifi	The arcs light from the handset outwards, like a signal being acquired.
chart	The bars grow out of the baseline in sequence.
arrow-right	Travels right while its shaft retracts behind the head.
chevron-down	Bobs, landing with a bounce.
thumbs-up	Rocks about its wrist.
warning	Shakes while the exclamation flashes.
info	The circle pulses while the “i” hops.

Listing them at runtime

foreach (var name in MotionIconLibrary.Names)
    Console.WriteLine(name);

var bell = MotionIconLibrary.Get("bell");        // throws if missing
var maybe = MotionIconLibrary.Find("bell");      // null if missing

Lookup is case-insensitive. MotionIconLibrary.All gives you the definitions themselves, which is how the sample app builds its gallery.

Overriding one

Register replaces a built-in as well as adding a new one, so an app with its own visual language can swap the artwork for check once at startup instead of passing a definition in at every call site:

MotionIconLibrary.Register(new MotionIconDefinition(
    "check",
    [new MotionIconPart("mark", "M5 13L10 18L19 6")],
    MotionSpecBuilder.Build(400, m => m
        .Trim("mark", k => k.At(0d, 0d, MotionEase.CubicOut).At(1d, 1d)))));

Every Icon="check" in the app picks it up.