def make_colour_scale(self, attr, cmin, cmax, opacity):
scale = colour_for_layer(self.defn)
def add_class(rgb, expr):
rgb *= 255.
###print expr, rgb
cls = self.make_class()
cls.setExpression(expr)
self.outline(cls)
style = self.make_style(cls)
style.color.setRGB(int(rgb.r), int(rgb.g), int(rgb.b))
style.color.alpha = int(opacity * 255)
# below cmin
inc = float(cmax - cmin)/(scale.nlevels - 2)
add_class(scale.lookup(cmin - inc), "([%s] < %g)" % (attr, cmin))
# intermediate "within range" levels
for idx in xrange(1,scale.nlevels-1):
vfrom = cmin + (idx - 1) * inc
vto = vfrom + inc
# we hedge on any floating-point rounding issues with a have increment jump into our level
# for the colour lookup
add_class(scale.lookup(vfrom+inc/2.), "([%s] >= %g AND [%s] < %g)" % (attr, vfrom, attr, vto))
# above cmin
add_class(scale.lookup(cmax + inc), "([%s] >= %g)" % (attr, cmax))
def make_colour_scale(self, attr, cmin, cmax, opacity):
scale = colour_for_layer(self.defn)
def add_class(rgb, expr):
rgb *= 255.
cls = self.make_class()
cls.setExpression(expr)
self.outline(cls)
style = self.make_style(cls)
style.color.setRGB(int(rgb.r), int(rgb.g), int(rgb.b))
style.color.alpha = int(opacity * 255)
# below cmin
inc = float(cmax - cmin) / (scale.nlevels - 2)
add_class(scale.lookup(cmin - inc), "([%s] < %g)" % (attr, cmin))
# intermediate "within range" levels
for idx in xrange(1, scale.nlevels - 1):
vfrom = cmin + (idx - 1) * inc
vto = vfrom + inc
# we hedge on any floating-point rounding issues with a have increment jump into our level
# for the colour lookup
add_class(scale.lookup(vfrom + inc / 2.),
"([%s] >= %g AND [%s] < %g)" % (attr, vfrom, attr, vto))
# above cmin
add_class(scale.lookup(cmax + inc), "([%s] >= %g)" % (attr, cmax))
def layer_legend(map_name, layer_id, client_rev):
defn_obj = MapDefinition.get_by_name(map_name)
if defn_obj is None:
abort(404)
defn = defn_obj.get()
rev = defn.get('rev', 0)
if not defn.has_key('layers'):
abort(404)
layer_defn = defn['layers'].get(layer_id, None)
if layer_defn is None:
abort(404)
scale = colour_for_layer(layer_defn)
return Response(headers={'Cache-Control' : 'max-age=86400, public'}, response=scale.legend(), status=200, content_type='image/png')
def layer_legend(map_name, layer_id, client_rev):
defn_obj = MapDefinition.get_by_name(map_name)
if defn_obj is None:
abort(404)
defn = defn_obj.get()
if 'layers' not in defn:
abort(404)
layer_defn = defn['layers'].get(layer_id, None)
if layer_defn is None:
abort(404)
scale = colour_for_layer(layer_defn)
return Response(headers={'Cache-Control': 'max-age=86400, public'},
response=scale.legend(),
status=200,
content_type='image/png')
