[Dprglist] LF intersection angle rule

John Swindle swindle at compuserve.com
Fri Dec 8 22:36:20 PST 2017


I'd say the crossing in your drawing was about either 30 degrees or 150 degrees, and since it could come in on either side, I'd have to look for both. I am not asking that the rules state which side the angle is measured from. My issue is that I am developing a two-step test that covers all the conditions in the Challenge, but in the steps I need to include something that rejects the intersections. I am OK with rejecting any line that is 70 degrees to 110 degrees on either side. If the intersecting line is straight, the test is a bit more robust. If each side is 70 to 110 degrees (a bent intersecting line), my two-step test might fail.

Doing it "that's just wrong" way,
John Swindle

-----Original Message-----
From: Doug Paradis <paradug at gmail.com>
To: John Swindle <swindle at compuserve.com>
Cc: DPRG <dprglist at lists.dprg.org>
Sent: Fri, Dec 8, 2017 11:52 pm
Subject: Re: LF intersection angle rule

    In the challenge course, all the intersections are 90 degrees. The rule was written to allow crossing variations in the future. I'm thinking that  70-90 degrees would represent the smallest angle of the intersection. I not sure that is right, just the way I would interpret the angle.  
if you saw an intersection that was like this:
           |   /
           | /
         / |
        /  |
       /   |

What angle would you say the intersection was? 

Doug P.

On Fri, Dec 8, 2017 at 9:03 PM, John Swindle <swindle at compuserve.com> wrote:

The Line Following Challenge rules say "Intersections may cross with angles of 70 - 90 degrees." Doesn't that really mean 70 to 110 degrees? Is the intersecting line straight, or can it bend at the intersection?
John Swindle

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