drf_plot.py 文件源码

def iq_plot(data, toffset, log_scale, title):
    """Plot an IQ circle from the data in linear or log scale."""
    print("iq")

    if log_scale:
        rx_raster_r = numpy.sign(
            data.real) * numpy.log10(numpy.abs(data.real) + 1E-30) / numpy.log10(2.)
        rx_raster_i = numpy.sign(
            data.imag) * numpy.log10(numpy.abs(data.imag) + 1E-30) / numpy.log10(2.)
    else:
        data *= 1.0 / 32768.0
        rx_raster_r = data.real
        rx_raster_i = data.imag

    fig = plt.figure()
    ax = fig.add_subplot(1, 1, 1)
    ax.plot(rx_raster_r, rx_raster_i, '.')

    axmx = numpy.max([numpy.max(rx_raster_r), numpy.max(rx_raster_i)])

    ax.axis([-axmx, axmx, -axmx, axmx])
    ax.grid(True)
    ax.set_xlabel('I')
    ax.set_ylabel('Q')
    ax.set_title(title)

    return fig