Method applyDrag

src/main/java/fieldbox/boxes/plugins/Handles.java:321–349

(Draggable x, Vec2 mouseWas, Vec2 mouseNow, Vec3 initialPosition)

		if (x.source != null && x.source.attributes.has(inside)) {
			System.out.println(" this is 3d");
			Viewport v = x.source.attributes.get(inside);

			Vec2 ds = v.viewportToDrawingSpace(initialPosition);

			System.out.println(" old drawing space " + ds);

			ds.x += mouseNow.x - mouseWas.x;
			ds.y += mouseNow.y - mouseWas.y;

			System.out.println(" new drawing space " + ds);

			Vec3 v1 = v.drawingSpaceToViewport(ds, 0.1f);
			Vec3 v2 = v.drawingSpaceToViewport(ds, 0.9f);

			Vec3 n = new Vec3(v2).sub(v1).normalize();

			double ll = new Vec3(initialPosition).sub(v1).dot(n);

			Vec3 ret = n.scale(ll).add(v1);

			System.out.println(" closest point to point " + initialPosition + " is " + ret + " (" + ll + " away)");

			return ret;
		}
		return new Vec3(mouseNow.x - mouseWas.x + initialPosition.x, mouseNow.y - mouseWas.y + initialPosition.y, initialPosition.z);
	}


	private void commit() {
		all().forEach(x -> x.commit());
	}