PyX — Gallery: graph/symbolline.py

# contributed by Francisco Borges

from pyx import *
from pyx.graph import graphxy, data, axis
from pyx.graph.axis import painter, tick
from pyx.deco import earrow

range = 2.5

p = painter.regular(basepathattrs=[earrow.normal], titlepos=0.95,
                    outerticklength=painter.ticklength.normal,
                    titledist=-0.3, titledirection=None) # horizontal text

g = graphxy(width=10, xaxisat=0, yaxisat=0,
            x=axis.linear(title="$x$", min=-range, max=+range, painter=p,
                          # suppress some ticks by overwriting ...
                          manualticks=[tick.tick(0, None, None),
                                       tick.tick(range, None, None)]),
            y=axis.linear(title=r"$x\sin(x^2)$", painter=p,
                          manualticks=[tick.tick(0, None, None),
                                       tick.tick(3, None, None)]))

g.plot(data.function("y(x)=x*sin(x**2)"),
       # Line style is set before symbol style -> symbols will be draw
       # above the line.
       [graph.style.line([style.linewidth.Thin, style.linestyle.solid]),
        graph.style.symbol(graph.style.symbol.circle, size=0.1,
                           symbolattrs=[deco.filled([color.rgb.green]),
                                        deco.stroked([color.rgb.red])])])

# manually typeset "0" near the origin
g.dolayout()
x0, y0 = g.pos(0, 0)
g.text(x0 - 0.2, y0 - 0.2, "0", [text.halign.right, text.valign.top])

g.writeEPSfile()
g.writePDFfile()
g.writeSVGfile()