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Tracing polylines produces
vector polylines which approximate raster curves.
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To trace polylines you
need.
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Before tracing you need to
tune the tracing parameters.
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Afterwards, choose a
tracing mode – for example, Make Vector and Keep Raster by pressing the Make
Vector and Keep Raster button, and the tracing command – Line
Following.
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Then, specify a point on
the raster curve – the program tracks this curve up to the nearest
intersection with another raster line, and then indicates by a cross the most
probable tracing direction. If you are happy with the offered direction,
press the Space key (alternatively, the program will continue
tracing after the pause expires).
If you are not happy with the direction suggested by the program, specify
the correct direction on the screen.
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