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<div class="im"><p>On November 20th, 2011, 2:14 p.m., <b>Niko Sams</b> wrote:</p>
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<pre style="white-space:pre-wrap;white-space:-moz-pre-wrap;white-space:-pre-wrap;white-space:-o-pre-wrap;word-wrap:break-word">...but m_pointMap is a QMap<QDateTime, GeoDataCoordinates> and so can story only a single coordinate for QDateTime::invalid()) :/</pre>
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<pre style="margin-left:1em;white-space:pre-wrap;white-space:-moz-pre-wrap;white-space:-pre-wrap;white-space:-o-pre-wrap;word-wrap:break-word">Yes, this complicates things. We should either discard the points without a time or if we want to fully support the kml and gpx specs, we may need to use another data structure to preserve order, for example, the following is valid:
<gx:Track>
<when>2010-05-28T02:02:09Z</when>
<when></when>
<when>2010-05-28T02:02:44Z</when>
<when></when>
<when>2010-05-28T02:02:54Z</when>
<gx:coord>-122.207881 37.371915 156.000000</gx:coord>
<gx:coord>-122.205712 37.373288 152.000000</gx:coord>
<gx:coord>-122.204678 37.373939 147.000000</gx:coord>
<gx:coord>-122.203572 37.374630 142.199997</gx:coord>
<gx:coord>-122.203451 37.374706 141.800003</gx:coord>
</gx:Track>
And I'm not familiar with GPX but the following is probably valid:
<trkpt lat="47.644548" lon="-122.326897">
<ele>4.46</ele>
<time>2009-10-17T18:37:26Z</time>
</trkpt>
<trkpt lat="47.644548" lon="-122.326897">
<ele>4.94</ele>
</trkpt>
<trkpt lat="47.644548" lon="-122.326897">
<ele>6.87</ele>
<time>2009-10-17T18:37:34Z</time>
</trkpt>
In both cases, simply putting the points without a time in a list is not enough, we need to know the time value of the point before and the one after.
Or we could just discard points without a time if supporting this is too much work for too little benefit.</pre></div></div></blockquote><div>discarding is not an option, as it is quite common for gpx files to have no time information.</div>
<div>I'm not sure if your example is relevant - in practice the whole track contains time information - or not at all.</div><div>But it would be more accurate if it is supported.</div><div>What do you think about dropping the QMap and replacing it with two lists?</div>
<div>I don't know about performance requirements in your case - if needed some additional index as cache would help?</div><div><br></div><div>Niko</div></div>