i'm trying to define a style which varies along the length of the line
it's applied to, according to the position along that line. at the
moment, as far as i can see, all styles are continuous along the line
so, for example let's say i want the line to be drawn as a cone, i would
define the width of the style as proportional to the position on the
something like: line_width = line_pos x 0.1
at the start of the line, the width of the style should be 0m
1m along the line, the width should be 0.1m
1.5m along the line, the width should be 0.15m
10m along the line, the width should be 1m
and so on
any ideas about the best way to do this?
i considered adding a *lot* of nodes and varying the width in small
steps at each node, but that would be clumsy and fiddly.
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