--- On Sun, 2/28/10, David Goldsmith <d_l_goldsm...@yahoo.com> wrote:
> > >> > Question 2) is there some way I can add
> > pieces of the
> > >> array incrementally to
> > >> > the image into their proper place,
> i.e.,
> > modify the
> > >> following code:
> > >> >
> > >> > ax.imshow(image[0:ny/2+1,
> 0:nx/2+1]) #
> > upper
> > >> left corner of image
> > >> > ax.hold(True)
> > >> > ax.imshow(argW[ny/2+1:-1,
> 0:nx/2+1]) #
> > lower
> > >> left corner of image
> > >> > ax.imshow(argW[0:ny/2+1,
> nx/2+1:-1]) #
> > upper
> > >> right corner of image
> > >> > ax.imshow(argW[ny/2+1:-1,
> nx/2+1:-1])
> > # lower
> > >> right corner of image
> > >>
> > >> Try the extents keyword argument. It let's
> you
> > specify the
> > >> corners of
> > >> the image in data coordinates.
> > >>
> > >> Ryan
> > >
> > > Hi, Ryan, thanks! Can you be a little more
> specific
> > as to how I should try that? I tried:
> > >
> > > ax.imshow(argW[0:ny/2+1, 0:nx/2+1], cmap_name,
> > extent=(0,nx/2,ny/2,0))
> > > ax.hold(True)
> > > ax.imshow(argW[ny/2+1:-1, 0:nx/2+1], cmap_name,
> > extent=(0,nx/2,ny,ny/2))
> > > ax.imshow(argW[0:ny/2+1, nx/2+1:-1], cmap_name,
> > extent=(nx/2,nx,ny/2,0))
> > > ax.imshow(argW[ny/2+1:-1, nx/2+1:-1], cmap_name,
> > extent=(nx/2,nx,ny,ny/2))
> > >
> > > which didn't work (I only got one "corner" - the
> last
> > one, I think - i.e., I think it's still just putting
> > subsequent images on top of prior ones).
> >
> > Based on just a quick look, I'd make sure:
> >
> > 1) To set the x and y limits appropriately:
> >
> > ax.set_xlim(0, nx)
> > ax.set_ylim(ny, 0)
>
> I'll try it out and report back.
Nope, still only getting the last corner. Let me give a little more of my code:
import numpy as N
from matplotlib.backends.backend_agg import FigureCanvasAgg as FigureCanvas
from matplotlib.figure import Figure
w, h, DPI = (8.2, 6.2, 50)
fig = Figure(figsize=(w, h),
dpi=DPI,
frameon=False)
ax = fig.add_subplot(1,1,1)
canvas = FigureCanvas(fig)
nx, xmin, xmax = (int(w*DPI), -0.5, 0.5)
ny, ymin, ymax = (int(h*DPI), 0.6, 1.2)
W = N.zeros((ny,nx),N.complex)
## Generate non-trivial W; unnecessary for code to run, I think
argW = N.angle(W)
ax.set_xlim(0, nx)
ax.set_ylim(ny, 0)
ax.imshow(argW[0:ny/2, 0:nx/2], extent=(0, nx/2 - 1, ny/2 - 1, 0))
ax.hold(True)
ax.imshow(argW[ny/2:-1, 0:nx/2], extent=(0, nx/2 - 1, ny, ny/2))
ax.imshow(argW[0:ny/2, nx/2:-1], extent=(nx/2, nx, ny/2 - 1, 0))
ax.imshow(argW[ny/2:-1, nx/2:-1], extent=(nx/2, nx, ny, ny/2))
canvas.print_figure(fid, dpi=DPI)
DG
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