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    Great meeting today.  <br>
    <br>
    Doug, I have a question based on Ron and Carl's presentations,
    perhaps it has already been answered, to wit:<br>
    <br>
    As I understand, the line following course consists of an assembly
    of square tiles, each of which has an entry and exit point.<br>
    <br>
    Is it sufficient for the robot to just identify the entry and exit
    points, and drive directly from one to the other?<br>
    <br>
    That is, it would not follow the line per se, though with
    sufficiently large robot the differences would probably be pretty
    negligible, but it would follow the course.<br>
      <br>
    thanks,<br>
    dpa<br>
    <br>
    <br>
    <div class="moz-cite-prefix">On 12/09/2017 08:18 AM, Doug Paradis
      wrote:<br>
    </div>
    <blockquote
cite="mid:CAOdUW+ZWfu90FrpFwTy-0dxOP+PNMWKhdYkdr9Pv4FSYHa-6+w@mail.gmail.com"
      type="cite">
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      <div dir="ltr">John,
        <div>    Currently, the intersecting lines are always straight
          and all intersections are 90 degrees. Curves lines at an
          intersection would be a possible addition to further challenge
          courses (interesting idea). The link to the course layout is
          at </div>
        <div><a moz-do-not-send="true"
href="https://www.dprg.org/wp-content/uploads/2017/11/DPRG-Roborama-2011b-Challenge-Level-LF-Course.pdf">https://www.dprg.org/wp-content/uploads/2017/11/DPRG-Roborama-2011b-Challenge-Level-LF-Course.pdf </a> 
          If you have any additional questions, let me know. I would
          love to see your work on the tests that you are developing.</div>
        <div><br>
        </div>
        <div>Regards,</div>
        <div>Doug P.</div>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Sat, Dec 9, 2017 at 12:36 AM, John
          Swindle <span dir="ltr"><<a moz-do-not-send="true"
              href="mailto:swindle@compuserve.com" target="_blank">swindle@compuserve.com</a>></span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0
            .8ex;border-left:1px #ccc solid;padding-left:1ex"><font
              face="Arial, Helvetica, sans-serif" size="2" color="black">Doug,
              <div><br>
              </div>
              <div>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.</div>
              <div><br>
              </div>
              <div>Doing it "that's just wrong" way,</div>
              <div>John Swindle</div>
              <div>
                <div class="h5">
                  <div><br>
                    <br>
                    <div
                      style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original
                      Message-----<br>
                      From: Doug Paradis <<a moz-do-not-send="true"
                        href="mailto:paradug@gmail.com" target="_blank">paradug@gmail.com</a>><br>
                      To: John Swindle <<a moz-do-not-send="true"
                        href="mailto:swindle@compuserve.com"
                        target="_blank">swindle@compuserve.com</a>><br>
                      Cc: DPRG <<a moz-do-not-send="true"
                        href="mailto:dprglist@lists.dprg.org"
                        target="_blank">dprglist@lists.dprg.org</a>><br>
                      Sent: Fri, Dec 8, 2017 11:52 pm<br>
                      Subject: Re: LF intersection angle rule<br>
                      <br>
                      <div
id="m_-2867064402782409486AOLMsgPart_2_81c7d011-0908-4c74-95cc-d249b881afbf">
                        <div
                          class="m_-2867064402782409486aolReplacedBody">
                          <div dir="ltr">John,
                            <div>    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.  </div>
                            <div>if you saw an intersection that was
                              like this:</div>
                            <div>           |   /</div>
                            <div>           | /</div>
                            <div>           /</div>
                            <div>         / |</div>
                            <div>        /  |</div>
                            <div>       /   |</div>
                            <div><br>
                            </div>
                            <div>What angle would you say the
                              intersection was? </div>
                            <div><br>
                            </div>
                            <div>Regards,</div>
                            <div>Doug P.</div>
                          </div>
                          <div
                            class="m_-2867064402782409486aolmail_gmail_extra"><br>
                            <div
                              class="m_-2867064402782409486aolmail_gmail_quote">On
                              Fri, Dec 8, 2017 at 9:03 PM, John Swindle
                              <span dir="ltr"><<a
                                  moz-do-not-send="true" rel="noopener
                                  noreferrer"
                                  href="mailto:swindle@compuserve.com"
                                  target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:swindle@compuserve.com">swindle@compuserve.com</a></a>></span>
                              wrote:<br>
                              <blockquote
                                class="m_-2867064402782409486aolmail_gmail_quote"
                                style="margin:0 0 0 .8ex;border-left:1px
                                #ccc solid;padding-left:1ex"><font
                                  face="Arial, Helvetica, sans-serif"
                                  size="2" color="black">
                                  <div>
                                    <div>Doug,</div>
                                    <div> </div>
                                    <div>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?</div>
                                    <div> </div>
                                    <div>Thanks,</div>
                                    <div>John Swindle</div>
                                    <div> </div>
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                                      style="color:black;font-family:arial,helvetica;font-size:10pt"><br>
                                    </div>
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