89 lines
2.6 KiB
Python
Executable file
89 lines
2.6 KiB
Python
Executable file
#!/usr/bin/env python
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import mapnik
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import sys
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class MyText(mapnik.FormatingNode):
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def __init__(self):
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mapnik.FormatingNode.__init__(self)
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self.expr = mapnik.Expression("[name]")
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self.expr_nr = mapnik.Expression("[nr]")
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def apply(self, properties, feature, output):
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colors = [mapnik.Color('red'),
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mapnik.Color('green'),
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mapnik.Color('blue')]
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text = self.expr.evaluate(feature)
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if int(feature['nr']) > 5:
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i = 0
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my_properties = mapnik.CharProperties(properties)
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for char in text:
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my_properties.fill = colors[i % len(colors)]
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output.append(my_properties, char)
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i += 1
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else:
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output.append(properties, text)
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def add_expressions(self, output):
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output.insert(self.expr)
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output.insert(self.expr_nr)
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class IfElse(mapnik.FormatingNode):
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def __init__(self, condition, if_node, else_node):
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mapnik.FormatingNode.__init__(self)
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self.condition = mapnik.Expression(condition)
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self.if_node = if_node
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self.else_node = else_node
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def apply(self, properties, feature, output):
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c = self.condition.evaluate(feature)
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if c:
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self.if_node.apply(properties, feature, output)
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else:
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self.else_node.apply(properties, feature, output)
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def add_expressions(self, output):
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output.insert(self.condition)
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self.if_node.add_expressions(output)
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self.else_node.add_expressions(output)
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m = mapnik.Map(600, 100)
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m.background = mapnik.Color('white')
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text = mapnik.TextSymbolizer()
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text.placements.defaults.displacement = (0, 5)
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text.placements.defaults.default_format.face_name = 'DejaVu Sans Book'
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point = mapnik.PointSymbolizer()
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rule = mapnik.Rule()
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rule.symbols.append(text)
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rule.symbols.append(point)
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style = mapnik.Style()
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style.rules.append(rule)
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m.append_style('Style', style)
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layer = mapnik.Layer('Layer')
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layer.datasource = mapnik.Shapefile(file="points.shp")
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layer.styles.append('Style')
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m.layers.append(layer)
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bbox = mapnik.Box2d(-0.05, -0.01, 0.95, 0.01)
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m.zoom_to_box(bbox)
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format_trees = [
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('TextNode', mapnik.FormatingTextNode(mapnik.Expression("[name]"))),
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('MyText', MyText()),
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('IfElse', IfElse("[nr] != '5'",
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mapnik.FormatingTextNode(mapnik.Expression("[name]")),
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mapnik.FormatingTextNode(mapnik.Expression("'SPECIAL!'"))))
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]
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for format_tree in format_trees:
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text.placements.defaults.format_tree = format_tree[1]
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mapnik.render_to_file(m, 'python-%s.png' % format_tree[0], 'png')
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