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All,
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<div class="">My solution below turned out to not be correct either. It just ramps down from RED to the color WHITE, no transparency.</div>
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<div class="">Here is the layer block I’m using that I’m trying to fade to a transparent feature:</div>
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<div class=""><font face="Courier" class="">MAP</font></div>
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<div class=""><font face="Courier" class=""><span class="Apple-tab-span" style="white-space:pre"></span>TRANSPARENT true</font></div>
<div class=""><font face="Courier" class=""><span class="Apple-tab-span" style="white-space:pre"></span>IMAGECOLOR 254 254 254</font></div>
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<div class=""><font face="Courier" class=""><more stuff></font></div>
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<div class=""><font face="Courier" class=""> LAYER</font></div>
<div class=""><font face="Courier" class=""> METADATA</font></div>
<div class=""><font face="Courier" class=""> "ows_title" "bbox"</font></div>
<div class=""><font face="Courier" class=""> "gml_include_items" "all"</font></div>
<div class=""><font face="Courier" class=""> END</font></div>
<div class=""><font face="Courier" class=""><span class="Apple-tab-span" style="white-space:pre"></span>GROUP 'users'</font></div>
<div class=""><font face="Courier" class=""> NAME 'bbox'</font></div>
<div class=""><font face="Courier" class=""> STATUS ON</font></div>
<div class=""><font face="Courier" class=""> TYPE LINE</font></div>
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<div class=""><font face="Courier" class=""><span class="Apple-tab-span" style="white-space:pre"></span><DB connections stuff></font></div>
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<div class=""><font face="Courier" class=""><span class="Apple-tab-span" style="white-space:pre"></span>## the following greabs a 5 min chunk of data (BBOX geoms from the database from 28 hrs ago and assigns a seq and elapsed time column to the result.</font></div>
<div class=""><font face="Courier" class=""> DATA "bbox from (</font></div>
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<div class=""><font face="Courier" class=""> SELECT</font></div>
<div class=""><font face="Courier" class=""><span class="Apple-tab-span" style="white-space:pre"></span>row_number() over (order by accessed_at nulls last) as seq,</font></div>
<div class=""><font face="Courier" class=""><span class="Apple-tab-span" style="white-space:pre"></span>date_part('epoch', (now() - INTERVAL '28 hours' - accessed_at)::interval) as elapsed,</font></div>
<div class=""><font face="Courier" class=""><span class="Apple-tab-span" style="white-space:pre"></span>id, accessed_at, bbox</font></div>
<div class=""><font face="Courier" class=""> FROM</font></div>
<div class=""><font face="Courier" class=""> layer_metrics</font></div>
<div class=""><font face="Courier" class=""> Where</font></div>
<div class=""><font face="Courier" class=""> accessed_at < (NOW() - INTERVAL '28 hours')</font></div>
<div class=""><font face="Courier" class=""><span class="Apple-tab-span" style="white-space:pre"></span>AND</font></div>
<div class=""><font face="Courier" class=""> accessed_at >= (NOW() - INTERVAL '28 hours' - INTERVAL '5 minute')</font></div>
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</font></div>
<div class=""><font face="Courier" class=""> ) as subquery using unique id using srid=200068"</font></div>
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<div class=""><font face="Courier" class=""> LABELITEM "elapsed"</font></div>
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<div class=""><font face="Courier" class=""><span class="Apple-tab-span" style="white-space:pre"></span>CLASS</font></div>
<div class=""><font face="Courier" class=""> #NAME "5 Minute Trail"</font></div>
<div class=""><font face="Courier" class=""><span class="Apple-tab-span" style="white-space:pre"></span>EXPRESSION ([elapsed] >= 0 AND [elapsed] < 300) ## 0-5min </font></div>
<div class=""><font face="Courier" class=""><span class="Apple-tab-span" style="white-space:pre"></span>STYLE</font></div>
<div class=""><font face="Courier" class=""> OUTLINECOLOR 0 0 0</font></div>
<div class=""><font face="Courier" class=""> OUTLINEWIDTH 1</font></div>
<div class=""><font face="Courier" class=""> #COLOR 0 255 0</font></div>
<div class=""><font face="Courier" class=""><span class="Apple-tab-span" style="white-space:pre"></span>COLORRANGE 255 0 0 254 254 254 ##red to opaque (see IMAGECOLOR in the MAP block above)</font></div>
<div class=""><font face="Courier" class=""><span class="Apple-tab-span" style="white-space:pre"></span>DATARANGE 0 300</font></div>
<div class=""><font face="Courier" class=""><span class="Apple-tab-span" style="white-space:pre"></span>RANGEITEM "elapsed"</font></div>
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<div class=""><font face="Courier" class=""><span class="Apple-tab-span" style="white-space:pre"></span>END</font></div>
<div class=""><font face="Courier" class=""><span class="Apple-tab-span" style="white-space:pre"></span>END</font></div>
<div class=""><font face="Courier" class=""><span class="Apple-tab-span" style="white-space:pre"></span>END</font></div>
<div class=""><font face="Courier" class="">END</font></div>
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<div class="">bobb</div>
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<blockquote type="cite" class="">
<div class="">On Jun 2, 2015, at 4:27 PM, Ben Madin <<a href="mailto:ben@ausvet.com.au" class="">ben@ausvet.com.au</a>> wrote:</div>
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<div class="">Bob,<br class="">
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Nice, I never knew that such a colorrange option existed (at least, I couldn’t find it documented anywhere?) but I would have presumed maybe you could specify the colour using the alpha like any other colour?<br class="">
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<blockquote type="cite" class="">COLORRANGE 255 0 0 255 255 255 255 0 ## red -> transparent<br class="">
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Alternatively, if you had a common background colour, you could fade to that?<br class="">
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cheers<br class="">
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Ben<br class="">
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<blockquote type="cite" class="">On 2015-06-03, at 04:48 , Basques, Bob (CI-StPaul) <<a href="mailto:bob.basques@ci.stpaul.mn.us" class="">bob.basques@ci.stpaul.mn.us</a>> wrote:<br class="">
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All,<br class="">
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Anyone know how to use a transparent color on one end of the coloring option?<br class="">
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COLORRANGE 255 0 0 ??? ??? ??? ## red -> transparent<br class="">
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It there a RGB color to use for Transparency to fade to? I basically want to fade a line based on age to nothing.<br class="">
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Thanks<br class="">
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bobb<br class="">
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</blockquote>
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-- <br class="">
<br class="">
Ben Madin<br class="">
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t : +61 8 6102 5535<br class="">
m : +61 448 887 220<br class="">
e : <a href="mailto:ben@ausvet.com.au" class="">ben@ausvet.com.au</a><br class="">
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