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i want to update my sld. In my sld, there is not a filter but i want to apply a filter using the python,dynamically not by manually putting the values in sld. This is my sld.

<StyledLayerDescriptor xmlns="http://www.opengis.net/sld" `xmlns:ogc="http://www.opengis.net/ogc" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="1.0.0" xsi:schemaLocation="http://www.opengis.net/sld StyledLayerDescriptor.xsd">`
<NamedLayer>
<Name>Simple polygon with stroke</Name>
<UserStyle>
<Title>SLD Cook Book: Simple polygon with stroke</Title>
<FeatureTypeStyle>
<Rule>
<PolygonSymbolizer>
<Fill>
<CssParameter name="fill">#000080</CssParameter>
</Fill>
<Stroke>
<CssParameter name="stroke">#FFFFFF</CssParameter>
<CssParameter name="stroke-width">2</CssParameter>
</Stroke>
</PolygonSymbolizer>
</Rule>
</FeatureTypeStyle>
</UserStyle>
</NamedLayer>
</StyledLayerDescriptor>

Now i want to add a filter on my table attribute name_1 is there any way to do this in python. New filter will be in a Rule tag and will be under the FeatureTypeStyle.

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1 回答 1

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蟒蛇 SLD

好吧，我使用python-sld包动态地创建了 SLD 结构。

你可以在这里找到http://azavea.github.io/python-sld/项目。我必须说文档并不详尽，所以很多时候你必须尝试错误才能做你想做的事。对我来说，必须用创建的新 SLD 覆盖现有的 SLD，我无法修改现有的 SLD。

说这个，一旦你安装了包：

创建 SLD 结构

from sld import StyledLayerDescriptor, PolygonSymbolizer, Filter

mysld = StyledLayerDescriptor()
nl = mysld.create_namedlayer('Simple polygon with stroke')
ustyle = nl.create_userstyle()
fts = ustyle.create_featuretypestyle()

第一条规则

fts.create_rule('First Rule', PolygonSymbolizer)

mysld.NamedLayer.UserStyle.FeatureTypeStyle.Rules[0].PolygonSymbolizer.Fill.CssParameters[0].Value = '#000080'
mysld.NamedLayer.UserStyle.FeatureTypeStyle.Rules[0].PolygonSymbolizer.Stroke.CssParameters[0].Value = '#FFFFFF'
mysld.NamedLayer.UserStyle.FeatureTypeStyle.Rules[0].PolygonSymbolizer.Stroke.CssParameters[1].Value = '2'

第二条规则和过滤器

fts.create_rule('Second Rule', PolygonSymbolizer)

fts.Rules[1].create_filter('name_1', comparator, value)

规则示例：

fts.Rules[1].create_filter('name_1', '>=', '0')

您可以在创建规则和添加变量的过滤器时做很多事情，例如我编写以下代码：

fts.create_rule(str(int(round(e))) + '-' + str(int(round(v[i + 1]))), PolygonSymbolizer)

fts.Rules[i].create_filter(field, '>=', str(e))

希望有帮助，祝福。

于 2017-01-03T03:40:37.820 回答