Hello,
On 04.12.06, Riccardo Campana wrote:
> Hello,
>
> with the standard command
> g = graph.graphxy(width=8,height=8)
> g.plot(graph.data.file("datafile.dat", x=1, y=2), [graph.style.symbol
> (graph.style.symbol.circle, size=0.1, symbolattrs=[deco.filled])])
>
> Now, I want to draw a straight line between some of these points, for
> example from the point (0.194, 0.854) to the point (0.311, 0.554).
>
> How can I do this? With path.line() and stroke() the points are not
> in graph (axis) coordinates...
draw the lines directly on g which is a canvas. g.pos allows you to
convert graph-coordinates into lengths
g.finish()
x1, y1 = g.pos(0.194, 0.854)
x2, y2 = g.pos(0.311, 0.554)
g.stroke(path.line(x1, y1, x2, y2))
If you want lines between all the points, just say instead in your
plot command
graph.style.line()
in addition to graph.style.symbol(...)
Michael.
--
"A mathematician is a device for turning coffee into theorems"
Paul Erdös.
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