Top Down Controller

This example shows how to build a custom system to calculate rotation of a sprite towards the mouse location.

this.world.addSystem(new TMouseInputSystem(this.world, engine.inputManager));
this.world.addSystem(new TTopDownInputSystem(this.world));
this.world.addSystem(new TopDownRotatorSystem(this.world));

// The sprite has TMouseInputComponent and TTopDownInputComponent.
// In TopDownRotatorSystem, query that sprite and its transform:
const angle = (topDownInputComponent.angle * 180) / Math.PI + 90;
transform.transform.rotation = quat.fromEuler(quat.create(), 0, 0, angle);