plot.py 5.84 KB
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from __future__ import division
import numpy as np
from ..import Field, RGSpace, HPSpace, GLSpace, PowerSpace
import os

# relevant properties:
# - x/y size
# - x/y/z log
# - x/y/z min/max
# - colorbar/colormap
# - axis on/off
# - title
# - axis labels

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def _mollweide_helper(xsize):
    xsize = int(xsize)
    ysize = xsize//2
    res = np.full(shape=(ysize, xsize), fill_value=np.nan,
                  dtype=np.float64)
    xc = (xsize-1)*0.5
    yc = (ysize-1)*0.5
    u, v = np.meshgrid(np.arange(xsize), np.arange(ysize))
    u = 2*(u-xc)/(xc/1.02)
    v = (v-yc)/(yc/1.02)

    mask = np.where((u*u*0.25 + v*v) <= 1.)
    t1 = v[mask]
    theta = 0.5*np.pi-(
        np.arcsin(2/np.pi*(np.arcsin(t1) + t1*np.sqrt((1.-t1)*(1+t1)))))
    phi = -0.5*np.pi*u[mask]/np.maximum(np.sqrt((1-t1)*(1+t1)), 1e-6)
    phi = np.where(phi < 0, phi+2*np.pi, phi)
    return res, mask, theta, phi

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def _find_closest(A, target):
    # A must be sorted
    idx = A.searchsorted(target)
    idx = np.clip(idx, 1, len(A)-1)
    left = A[idx-1]
    right = A[idx]
    idx -= target - left < right - target
    return idx

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def _makeplot(name):
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    import matplotlib.pyplot as plt
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    if name is None:
        plt.show()
        return
    extension = os.path.splitext(name)[1]
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    if extension == ".pdf":
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        plt.savefig(name)
        plt.close()
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    elif extension == ".png":
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        plt.savefig(name)
        plt.close()
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    # elif extension==".html":
        # import mpld3
        # mpld3.save_html(plt.gcf(),fileobj=name,no_extras=True)
        # import plotly.offline as py
        # import plotly.tools as tls
        # plotly_fig = tls.mpl_to_plotly(plt.gcf())
        # py.plot(plotly_fig,filename=name)
        # py.plot_mpl(plt.gcf(),filename=name)
        # import bokeh
        # bokeh.mpl.to_bokeh(plt.gcf())
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    else:
        raise ValueError("file format not understood")

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def _limit_xy(**kwargs):
    import matplotlib.pyplot as plt
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    x1, x2, y1, y2 = plt.axis()
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    if (kwargs.get("xmin")) is not None:
        x1 = kwargs.get("xmin")
    if (kwargs.get("xmax")) is not None:
        x2 = kwargs.get("xmax")
    if (kwargs.get("ymin")) is not None:
        y1 = kwargs.get("ymin")
    if (kwargs.get("ymax")) is not None:
        y2 = kwargs.get("ymax")
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    plt.axis((x1, x2, y1, y2))

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def plot(f, **kwargs):
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    import matplotlib.pyplot as plt
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    if not isinstance(f, Field):
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        raise TypeError("incorrect data type")
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    if len(f.domain) != 1:
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        raise ValueError("input field must have exactly one domain")

    dom = f.domain[0]
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    fig = plt.figure()
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    ax = fig.add_subplot(1, 1, 1)
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    xsize, ysize = 6, 6
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    if kwargs.get("xsize") is not None:
        xsize = kwargs.get("xsize")
    if kwargs.get("ysize") is not None:
        ysize = kwargs.get("ysize")
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    fig.set_size_inches(xsize, ysize)
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    if kwargs.get("title") is not None:
        ax.set_title(kwargs.get("title"))
    if kwargs.get("xlabel") is not None:
        ax.set_xlabel(kwargs.get("xlabel"))
    if kwargs.get("ylabel") is not None:
        ax.set_ylabel(kwargs.get("ylabel"))
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    cmap = plt.rcParams['image.cmap']
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    if kwargs.get("colormap") is not None:
        cmap = kwargs.get("colormap")
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    if isinstance(dom, RGSpace):
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        if len(dom.shape) == 1:
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            npoints = dom.shape[0]
            dist = dom.distances[0]
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            xcoord = np.arange(npoints, dtype=np.float64)*dist
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            ycoord = f.val
            plt.plot(xcoord, ycoord)
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            _limit_xy(**kwargs)
            _makeplot(kwargs.get("name"))
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            return
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        elif len(dom.shape) == 2:
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            nx = dom.shape[0]
            ny = dom.shape[1]
            dx = dom.distances[0]
            dy = dom.distances[1]
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            xc = np.arange(nx, dtype=np.float64)*dx
            yc = np.arange(ny, dtype=np.float64)*dy
            im = ax.imshow(f.val, extent=[xc[0], xc[-1], yc[0], yc[-1]],
                           vmin=kwargs.get("zmin"),
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                           vmax=kwargs.get("zmax"), cmap=cmap, origin="lower")
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            # from mpl_toolkits.axes_grid1 import make_axes_locatable
            # divider = make_axes_locatable(ax)
            # cax = divider.append_axes("right", size="5%", pad=0.05)
            # plt.colorbar(im,cax=cax)
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            plt.colorbar(im)
            _limit_xy(**kwargs)
            _makeplot(kwargs.get("name"))
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            return
    elif isinstance(dom, PowerSpace):
        xcoord = dom.kindex
        ycoord = f.val
        plt.xscale('log')
        plt.yscale('log')
        plt.title('power')
        plt.plot(xcoord, ycoord)
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        _limit_xy(**kwargs)
        _makeplot(kwargs.get("name"))
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        return
    elif isinstance(dom, HPSpace):
        import pyHealpix
        xsize = 800
        res, mask, theta, phi = _mollweide_helper(xsize)

        ptg = np.empty((phi.size, 2), dtype=np.float64)
        ptg[:, 0] = theta
        ptg[:, 1] = phi
        base = pyHealpix.Healpix_Base(int(np.sqrt(f.val.size//12)), "RING")
        res[mask] = f.val[base.ang2pix(ptg)]
        plt.axis('off')
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        plt.imshow(res, vmin=kwargs.get("zmin"), vmax=kwargs.get("zmax"),
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                   cmap=cmap, origin="lower")
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        plt.colorbar(orientation="horizontal")
        _makeplot(kwargs.get("name"))
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        return
    elif isinstance(dom, GLSpace):
        import pyHealpix
        xsize = 800
        res, mask, theta, phi = _mollweide_helper(xsize)
        ra = np.linspace(0, 2*np.pi, dom.nlon+1)
        dec = pyHealpix.GL_thetas(dom.nlat)
        ilat = _find_closest(dec, theta)
        ilon = _find_closest(ra, phi)
        ilon = np.where(ilon == dom.nlon, 0, ilon)
        res[mask] = f.val[ilat*dom.nlon + ilon]

        plt.axis('off')
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        plt.imshow(res, vmin=kwargs.get("zmin"), vmax=kwargs.get("zmax"),
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                   cmap=cmap, origin="lower")
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        plt.colorbar(orientation="horizontal")
        _makeplot(kwargs.get("name"))
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        return

    raise ValueError("Field type not(yet) supported")