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<DIV><FONT face=Arial size=2><SPAN class=757295900-08012010>I'm wanting a
renderer for vector field data. In my case this is earth deformation
data - surface displacements - but it could as easily be hydrological flow, or
other such data.</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=757295900-08012010></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=757295900-08012010>Ideally this will
display an arrow of length and orientation based on data values (x,y or
length,orientation) at points, but with some independent overall scaling to
allow all the vectors in a layer to be rescaled without recalculating the
data. To be perfect (!) it would also take account of the projection
convergence when using on the fly projections (though I could live without that,
at least initially!)</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=757295900-08012010></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=757295900-08012010>Do you know of a
plug-in that does that?</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=757295900-08012010></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=757295900-08012010>If not, is it
possible to build a renderer like this with a python
plug-in?</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=757295900-08012010></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=757295900-08012010>And if it is
possible, can you point me to any examples of a python renderer plug in that I
could build from (I haven't programmed python or the Qgis/Qt API before, so
examples would be really helpful!!)</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=757295900-08012010></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN
class=757295900-08012010>Thanks<BR>Chris</SPAN></FONT></DIV>
<DIV>
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<DIV><STRONG>Thank you.</STRONG> <BR></DIV>
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