Hi Olaf,<br><br>The idea looks compelling to me, however I would have some further questions before trying to propose a reasonable approach to this feature:<br><br>Combine Symbols:<br>1. What would be the position of the combined feature? Would this be one of the features have been combined or some other location (like the centroid of the features)?<br>
2. What did you mean by 'not to lose the FeatureInfo'? Does it mean that the invidual features should be retrieved from a 'query by point option' and not the combined feature?<br>3. Would this option affect only the point layers (with marker symbols) or some other types as well? (like annotations)<br>
<br>Displace Symbols:<br>1. How the position of the relocated symbols should be calculated? Would this be a constant vector assigned to each layer/class?<br>2. What should be happened when a relocated symbols would overlap with some other symbols because of the relocation?<br>
3. Shouldn't the relocation be displayed somehow? (ie. by using a line or arrow along with the symbol)<br>4. What type of layers would be affected? (points only?)<br><br>Assuming the distance threshold is specified in screen coordinates, what would be the possible values of COMBINEUNITS and DISPLACEUNITS?<br>
<br><br>Best regards,<br><br>Tamas<br><br><br><br><br><div class="gmail_quote">2011/1/24 Olaf Knopp <span dir="ltr"><<a href="mailto:olaf.knopp@wheregroup.com">olaf.knopp@wheregroup.com</a>></span><br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Hello everybody,<br>
<br>
for a project we need some software development to be done. We think these new features will become more important to provide modern and elegant maps and therefore would be a great add-on for MapServer. As working titles we call these functions "combine symbols" and "displace symbols".<br>
Here follows a rough concept for the functions.<br>
<br>
1. Combine symbols<br>
This function combines symbols of the same layer (or class) to one symbol containing the number of combined symbols if viewed in a certain scale.<br>
For this you have to mark a layer/class e.g. by "COMBINESYMBOLS TRUE", give a distance between the symbols (COMBINEDISTANCE xy, COMBINEUNITS …), perhaps a MAXCOUNT etc. You will also have to define a symbol and the label for the combination. It would be best no to lose the FeatureInfo and get a list of templates after clicking on the combined symbol. You will find a nice example of combined symbols here: <a href="http://www.verbeterdebuurt.nl/" target="_blank">http://www.verbeterdebuurt.nl/</a> (zoom to the Netherlands).<br>
By configuring a zoom range (e.g. COMBINEMAXSCALEDENOM, COMBINEMINSCALEDENOM) you define in which scales the symbols should be combined.<br>
<br>
2. Displace Symbols<br>
This function should relocate symbols of objects with same or similar coordinates so they don't conceal each other or overlap.<br>
For this you have to mark the mapfile e.g. by "DISPLACESYMBOLS YES" and give a distance between symbols that should be displaced (DISPLACEDISTANCE xy, DISPLACEUNITS …). Then you have to configure every layer similar to a label by giving a priority, a displace distance and an displace angle.<br>
You will also have to give a zoom range similar to the combine function described above. FeatureInfo should still work by clicking on the moved symbols.<br>
<br>
Who can develop this functions until the end of February? Is there anybody else interested in these functions?<br>
Please conctact us to discuss further details and to calculate a proposal.<br>
<br>
Greetings<br>
Olaf Knopp<br>
<br>
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