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Hi,<br>
<br>
I found a way around it by trial and error....<br>
<br>
It turned out to be the operation len(&lt;list&gt;) , where the
&lt;list&gt; was a list of graphics items caused the problem when used
in mouseReleaseEvent . In this case it was possible to change the code
achieving the same result but not using the len() method. <br>
<br>
Not sure if this helps in finding the problem.<br>
<br>
Cheers, Heinz<br>
<br>
Heinz A. Preisig wrote:
<blockquote cite="mid:471DD7DC.1040504@chemeng.ntnu.no" type="cite">Hi,<br>
  <br>
I have been expanding my code with new features after which I
experience an error<br>
  <br>
NotImplementedError: QGraphicsItem.boundingRect() is abstract and must
be overridden<br>
  <br>
when using the rubber band. The procedure has been working before, but
obviously I disturbed the devil.<br>
  <br>
Any suggestions on what to change or do to get rid of the problem<br>
  <br>
Cheers, Heinz<br>
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      <tr>
        <td style="width: 50%; vertical-align: top;"><span
 style="font-weight: bold;">Heinz A Preisig</span><br>
Professor of Process Systems Engineering</td>
        <td style="width: 50px; vertical-align: top;"><span style=""
 lang="EN-US">Private: <br>
&Oslash;vre Bakklandet 62 B, 7013 Trondheim, Norway<br>
        </span></td>
      </tr>
      <tr>
        <td style="vertical-align: top;"><span
 style="font-style: italic;">Department
of Chemical Engineering</span><br>
        <div style="text-align: left;"><span
 style="font-weight: bold; font-style: italic;"></span><span
 style="font-weight: bold; font-style: italic;">Norwegian
University of Science and
Technology&nbsp;&nbsp;&nbsp; &nbsp;&nbsp; </span><span
 style="font-size: 12pt; font-family: &quot;Times New Roman&quot;;"></span><br>
        </div>
        <span style="font-size: 12pt; font-family: &quot;Times New Roman&quot;;"><!--[if gte vml 1]><v:shapetype id="_x0000_t75"
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 style="font-weight: bold; font-style: italic;"></span><span
 style="font-style: italic;">N &#8211; 7491 Trondheim, Norway</span></td>
        <td style="vertical-align: top;">Tel direct:<span style="">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        </span> <span style="" lang="EN-US">+47&nbsp;<span style="">&nbsp; </span><span
 style="">&nbsp; </span>735
92807<span style=""><br>
        </span></span><span style="" lang="EN-US">Tel mob:<span style="">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        </span> +47 <span style="">&nbsp;&nbsp;&nbsp; </span>9754
1334<br>
        </span><span style="" lang="EN-US">e-mail:<span style="">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        </span><a moz-do-not-send="true"
 href="mailto:Heinz.Preisig@chemeng.ntnu.no">Heinz.Preisig@chemeng.ntnu.no</a><br>
        </span><span style="" lang="EN-US">web:<span style="">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
        </span><a moz-do-not-send="true"
 href="http://www.chemeng.ntnu.no/%7Epreisig">www.chemeng.ntnu.no\~preisig</a></span></td>
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&nbsp;
  <span style="font-weight: bold;"></span><br>
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  <pre wrap="">
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_______________________________________________
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<br>
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<title>business</title>
<br>
<br>
<table style="text-align: left; width: 785px; height: 124px;" border="1"
 cellpadding="2" cellspacing="1">
  <tbody>
    <tr>
      <td style="width: 50%; vertical-align: top;"><span
 style="font-weight: bold;">Heinz A Preisig</span><br>
Professor of Process Systems Engineering</td>
      <td style="width: 50px; vertical-align: top;"><span style=""
 lang="EN-US">Private: <br>
&Oslash;vre Bakklandet 62 B, 7013 Trondheim, Norway<br>
      </span></td>
    </tr>
    <tr>
      <td style="vertical-align: top;"><span style="font-style: italic;">Department
of Chemical Engineering</span><br>
      <div style="text-align: left;"><span
 style="font-weight: bold; font-style: italic;"></span><span
 style="font-weight: bold; font-style: italic;">Norwegian
University of Science and
Technology&nbsp;&nbsp;&nbsp; &nbsp;&nbsp; </span><span
 style="font-size: 12pt; font-family: &quot;Times New Roman&quot;;"></span><br>
      </div>
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 style="font-weight: bold; font-style: italic;"></span><span
 style="font-style: italic;">N &#8211; 7491 Trondheim, Norway</span></td>
      <td style="vertical-align: top;">Tel direct:<span style="">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
      </span> <span style="" lang="EN-US">+47&nbsp;<span style="">&nbsp; </span><span
 style="">&nbsp; </span>735
92807<span style=""><br>
      </span></span><span style="" lang="EN-US">Tel mob:<span style="">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
      </span> +47 <span style="">&nbsp;&nbsp;&nbsp; </span>9754
1334<br>
      </span><span style="" lang="EN-US">e-mail:<span style="">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
      </span><a href="mailto:Heinz.Preisig@chemeng.ntnu.no">Heinz.Preisig@chemeng.ntnu.no</a><br>
      </span><span style="" lang="EN-US">web:<span style="">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
      </span><a href="http://www.chemeng.ntnu.no/%7Epreisig">www.chemeng.ntnu.no\~preisig</a></span></td>
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