playcanvas/build/playcanvas/src/extras/input/utils.js

PlayCanvas WebGL game engine

const movementState = ()=>{
		const state = new Map();
		return {
				down: (event)=>{
						state.set(event.pointerId, [
								event.screenX,
								event.screenY
						]);
				},
				move: (event)=>{
						if (!state.has(event.pointerId)) {
								return [
										0,
										0
								];
						}
						const prev = state.get(event.pointerId);
						const mvX = event.screenX - prev[0];
						const mvY = event.screenY - prev[1];
						prev[0] = event.screenX;
						prev[1] = event.screenY;
						return [
								mvX,
								mvY
						];
				},
				up: (event)=>{
						state.delete(event.pointerId);
				}
		};
};

export { movementState };