[mos379]

Emit (2.1.0) throws particles outward and lets physics take them. That says something happened, but not where it went. A reward landing on a score counter, an item going into a basket, is a flight with a destination and a moment of arrival.

API

MyParticleCanvas.EmitTo(itemCentre, scoreCounter, onArrived: () => Score += 10);

EmitTo(SKPoint from, SKPoint to, …)	canvas pixels
EmitTo(Point from, Point to, …)	device-independent units

Optional color, size, durationMillis, arcHeight (fraction of distance; 0 is a straight line).

How it moves

FlyingStarParticle follows a quadratic Bézier with the control point lifted perpendicular to the flight, so it lobs rather than slides. It spins throughout, shrinks ~30% on approach, and fades over the final 15% so it dissolves into the target instead of stopping dead. Arrived fires on the landing frame; EmitTo marshals the callback to the main thread.

One change worth reviewing

ParticleBase gains IsFinished, and the animation loop now removes particles that report it:

_particles.RemoveAll(particle => particle.IsFinished || !canvasRect.Contains(…));

Until now a particle was only ever removed by leaving the view — and one that flies to a target lands inside it, so it would never be cleaned up. Existing particles return false and are unaffected.

TransformationMatrix moved from private set to protected set so a subclass can drive its own motion; the getter is unchanged.

🤖 Generated with Claude Code

https://claude.ai/code/session_012fvKRoJiVhmmARSE8k7Vtf