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LineSymbolizer

A LineSymbolizer is used to render a "stroke" along a linear geometry.

parameter value description unit default
stroke CSS colour A Color value such as 'green' or #A3D979 - "black"
stroke-width 0.0 - n Width of line pixels 1.0
stroke-opacity 0.0 - 1.0 1 is fully opaque while zero is fully transparent and .5 would be 50% transparent transparency 1.0
stroke-linejoin miter, round, bevel See SVG stroke-linejoin for an example for each value - miter
stroke-linecap round, butt, square See SVG stroke-linecap for an example for each value - butt
stroke-dasharray 0.0 - n,0.0 - n A pair of length values [a,b], where (a) is the dash length and (b) is the gap length respectively. More than two values are supported as well (e.g. to start the line not with a stroke, but with a gap). pixels none

Examples

Default

<LineSymbolizer />

XML

<LineSymbolizer stroke="#0000ff" stroke-width="4" />

Python

l = LineSymbolizer(Color('green'),0.1)

To work directly with the stroke object:

l = LineSymbolizer()
s = Stroke(Color('green'),0.1)
s.add_dash(.1,.1)
s.opacity = .5
l.stroke = s

Fetch all the possible methods like:

>>> from mapnik import LineSymbolizer
>>> dir(LineSymbolizer().stroke)

C++

rule_type rule;
stroke ls;         // This is the line symbolizer
ls.set_color(color(255, 255, 255));
ls.set_width(4);   // width of the line in pixels
ls.set_line_join(mapnik::ROUND_JOIN);
ls.set_line_cap(mapnik::ROUND_CAP);
ls.add_dash(2.5, 1.0);
ls.set_opacity(0.5);
rule.append(ls);
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