From: Dan Reinholz <xaenn@ya...>  20080610 15:31:58

I suppose because I have things on digest mode it's a little bit more difficult to respond directly. Nevertheless, thanks a lot for your help Andre. It just feels like the solution was too easy. : ) Even so, if anybody could tell me how to do fill patterns, I would still be interested to hear. Regards, Daniel  Dan Reinholz <xaenn@...> wrote: > Hello all, > > I'm a bit new to pyx (I was previously a gnuplot > user) > and have been struggling with this problem for > awhile. > > > I'm working on generating some graphs for calculus, > and I'm trying to illustrate the formal definition > of > the limit. In this I want to illustrate a box that > shows which range of x values stays within the error > tolerance. My code is: > > from pyx import * > from pyx.graph import axis > > def f(x): > return pow((x + 1),3) + 1 > a,b,c = 0.5874,1.28943,1 > > ticksx = [graph.axis.tick.tick(c, label="$x_0$")] > ticksy = [graph.axis.tick.tick(f(a), label="$L  > \\varepsilon$"), > graph.axis.tick.tick(f(c), label="$L$"), > graph.axis.tick.tick(f(b), label="$L + > \\varepsilon$")] > > g = graph.graphxy(width=8, > x=axis.linear(min=0, max=1.5, > title="$x$",manualticks=ticksx,parter=None), > > y=axis.linear(title="$f(x)$",manualticks=ticksy,parter=None)) > > d=g.plot(graph.data.function("y(x)=(x+1)**3 + > 1",points=1000)) > > g.finish() > > x1,y1 = g.pos(a,f(a)) > x2,y2 = g.pos(b,f(b)) > g.stroke(path.rect(x1,y1,x2x1,y2y1),[deco.filled([color.gray(0.8)]) > ]) > g.stroke(g.ygridpath(f(a)), > [style.linestyle.dashed,style.linewidth.Thin]) > g.stroke(g.xgridpath(a), > [style.linestyle.dashed,style.linewidth.Thin]) > > g.stroke(g.ygridpath(f(b)), > [style.linestyle.dashed,style.linewidth.Thin]) > g.stroke(g.xgridpath(b), > [style.linestyle.dashed,style.linewidth.Thin]) > > g.stroke(g.ygridpath(f(c)), [style.linewidth.Thin]) > g.stroke(g.xgridpath(c), [style.linewidth.Thin]) > > g.writeEPSfile("limit_definition") > > which works fine except for that I want the box to > be > behind the graph rather than on top of it. I've > thought of a few solutions, but haven't been able to > successfully implement any of them (I would actually > love to know how to do all of them, but I don't want > to be too greedy). > > 1. Knowing how to plot the filled rectangle beneath > the graph would solve the problem. > > 2. Knowing how to make the fill color transparent. > > 3. Knowing how to use a different pattern for the > fill > so that the graph of the function still shows > beneath > it. > > If anyone could please show me how to modify my > existing code or otherwise point me in the right > direction, it would be extremely helpful. I am not > very familiar with python, so I imagine syntax is > part > of my problem. Many thanks for any help that can be > offered. > > Regards, > Daniel > > > > 