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Board » Sailonline Race Committee » Rules and Decisions » Legality of the use of extra zoom on the apparent size of end points of finish line

Posted by Rod Posts 392 Registered at 2010-06-24 22:30:48	2021-02-22 19:35:11 - Legality of the use of extra zoom on the apparent size of end points of finish line
	When the end point of the finish line is examined on extra zoom, is it legal to set course very close to the point and still legally finish, even when, on standard zoom, the course would cross over the edge of the round dot? If it breaks, it's not strong enough--if it doesn't, it's too heavy.
Posted by ij Posts 33 Registered at 2018-06-09 20:33:19	2021-02-22 20:48:37 - Re: Legality of the use of extra zoom on the apparent size of end points of finish line
	All marks and finish line endpoints are singular coordinates on server side. That is, the server thinks their diameter is zero. However, I don't believe those "closest" pixels are really necessary in practice anyway as we talk very very small distances per pixel. I'd recommend leaving at least 0.002 degree margin in angle to be on the safe side (it's easy to check that the COG number in the infobox changes when aiming). The finish line endpoints are not provided by the server currently but they are calculated by the client(s), which is a potential (small) error source on their position. There was an unfortunate incident not so long ago related to it because html5 client finish line code pre-dated my access to server-side formulas. I'd like to change this among many other things eventually such that the finish line coordinates are provided by the server so such errors would no longer be possible. Occasionally pixel rounding related "jitter" may result in different positioning for the very same line so "crossing" is not even well-defined if only considered what is seen visually for a line. -- i.

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