I am working with some dynamic rainfall point data, and trying to display it
with a graduated color ramp to indicate total rainfall. The ramp is based on
the quartiles of the entire data set, hence the need to dynamically assign not
only the points but also the classIndex. I have attempted with the following
code which SUCCEEDS in drawing the points, but FAILS to change their
classification (they are all the same color). The gist of my code is to set
the class of each shape when setting the $shape->classIndex = whatever the
quartile is (I have 4 classes defined in my ramp - mapfile CLASS excerpt
follows code).
Any insight would be most helpful. Thanks!
<CODE>
foreach($qresult as $row) {
$shape = ms_newShapeObj(MS_SHAPE_POINT);
if ($row['total_precip_in'] > $max_precip) {
$max_precip = $row['total_precip_in'];
}
$p = $row['total_precip_in'];
if ($p < $q25) {
$c = 1;
} else {
if ($p < $q50) {
$c = 2;
} else {
if ($p < $q75) {
$c = 3;
} else {
$c = 4;
}
}
}
$this->logDebug("Adding: " . $row['x'] . "," . $row['y'] . " with
Precip = $p and Class = $c <br>\n");
$pt = ms_newPointObj();
$pt->setXY($row['x'], $row['y'], 0.0);
$line = ms_newLineObj();
$line->add( $pt );
$shape->add($line);
$shape->classIndex = $c;
$layer->addFeature( $shape );
$i++;
}
</CODE>
<MAPFILE EXCERPT>
CLASS
NAME "1st Quartile: 0.0 <= P <= 19.63"
#EXPRESSION ( [globvalue] <= 19.63 )
SYMBOL 'circle'
SIZE 2
COLOR 202 207 254
BACKGROUNDCOLOR 202 207 254
OUTLINECOLOR 202 207 254
END
CLASS
NAME "2nd Quartile: 19.63 < P <= 22.64"
#EXPRESSION ( [globvalue] > 19.63 and [globvalue] <= 22.64 )
SYMBOL 'circle'
SIZE 4
COLOR 137 148 253
BACKGROUNDCOLOR 137 148 253
OUTLINECOLOR 137 148 253
END
CLASS
NAME "3rd Quartile: 22.64 < P <= 25.6"
#EXPRESSION ( [globvalue] > 22.64 and [globvalue] <= 25.6 )
SYMBOL 'circle'
SIZE 6
COLOR 66 84 252
BACKGROUNDCOLOR 66 84 252
OUTLINECOLOR 66 84 252
END
CLASS
NAME "4th Quartile: P > 25.6"
#EXPRESSION ( [globvalue] > 25.6 )
SYMBOL 'circle'
SIZE 8
COLOR 4 26 236
BACKGROUNDCOLOR 4 26 236
OUTLINECOLOR 4 26 236
END
CLASS
NAME "No Data"
SYMBOL 'circle'
SIZE 2
COLOR 96 160 248
BACKGROUNDCOLOR 96 160 248
OUTLINECOLOR 96 160 248
END
</MAPFILE EXCERPT>
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