Function strokeBodyVelocity

packages/debug-plugin/src/patches.js:163–184

* Stroke a blue velocity arrow from `(originX, originY)` along the * body's current velocity vector. Scales by `(hW, hH)` so the arrow * length is visually proportional to the body's size regardless of * scale. Skips the draw entirely (and the counter increment) when * the body is at rest. Used

(
	renderer,
	panel,
	adapter,
	renderable,
	originX,
	originY,
	hW,
	hH,
)

 * @param {number} hH
 */
function strokeBodyVelocity(
	renderer,
	panel,
	adapter,
	renderable,
	originX,
	originY,
	hW,
	hH,
) {
	const v = adapter.getVelocity(renderable, sharedBodyVel);
	if (v.x === 0 && v.y === 0) {
		return;
	}
	renderer.save();
	renderer.lineWidth = 1;
	renderer.setColor("blue");
	renderer.translate(originX, originY);
	renderer.strokeLine(0, 0, Math.trunc(v.x * hW), Math.trunc(v.y * hH));
	panel.counters.inc("velocity");
	renderer.restore();
}

/**
 * Monkey-patch melonJS rendering classes to draw debug overlays