MatplotLib 'saveFig()' Fullscreen

user_5941350 0
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I used MatplotLib with Cartopy to generate some data images. The problem is that when I set the frame size to fullscreen and use plt.show() the image is perfect and the resolution is fine.

However, when I save this figure using 'plt.savefig()' the image saved keeps with its original size (not fullscreen).

Showing outcome images:

Showing the image - not saving it

Saving the image - not showing it

My code is the following:

def plot_tec_cartopy(descfile): global matrixLon, matrixLat, matrixTec

ax = plt.axes(projection=cartopy.crs.PlateCarree())

v = np.linspace(0, 80, 46, endpoint=True)
cp = plt.contourf(matrixLon, matrixLat, matrixTec, v, cmap=plt.cm.rainbow)
plt.clim(0, 80)
plt.colorbar(cp)

ax.add_feature(cartopy.feature.COASTLINE)
ax.add_feature(cartopy.feature.BORDERS, linestyle=':')
ax.set_extent([-85, -30, -60, 15])

# Setting X and Y labels using LON/LAT format
ax.set_xticks([-85, -75, -65, -55, -45, -35])
ax.set_yticks([-60, -55, -50, -45, -40, -35, -30, -25, -20, -15, -10, -5, 0, 5, 10, 15])
lon_formatter = LongitudeFormatter(number_format='.0f',
                                   degree_symbol='',
                                   dateline_direction_label=True)
lat_formatter = LatitudeFormatter(number_format='.0f',
                                  degree_symbol='')
ax.xaxis.set_major_formatter(lon_formatter)
ax.yaxis.set_major_formatter(lat_formatter)

plt.title('Conteúdo Eletrônico Total', style='normal', fontsize='12')

# Acquiring Date
year, julianday = check_for_zero(descfile.split('.')[2]), descfile.split('.')[3]
hour, minute = descfile.split('.')[4], descfile.split('.')[5].replace('h','')
date = datetime.datetime(int(year), 1, 1, int(hour), int(minute)) + datetime.timedelta(int(julianday)-1)
month = date.month
day = date.day

# Set common labels
ax.text(1.22, 1.05, 'TEC', style='normal',
    verticalalignment='top', horizontalalignment='right',
    transform=ax.transAxes,
    color='black', fontsize=11)
ax.text(1, 0.005, 'EMBRACE/INPE', style='italic',
    verticalalignment='bottom', horizontalalignment='right',
    transform=ax.transAxes,
    color='black', fontsize=10)
ax.text(1, 0.995, str(date) + ' UT', style='italic',
    verticalalignment='top', horizontalalignment='right',
    transform=ax.transAxes,
    color='black', fontsize=10)
ax.text(0.5, -0.08, 'Copyright \N{COPYRIGHT SIGN} 2017 INPE - Instituto Nacional de',
    style='oblique', transform=ax.transAxes,
    verticalalignment='bottom', horizontalalignment='center',
    color='black', fontsize=8)
ax.text(0.5, -0.108, 'Pesquisas Espacias. Todos direitos reservados',
    style='oblique', transform=ax.transAxes,
    verticalalignment='bottom', horizontalalignment='center',
    color='black', fontsize=8)

manager = plt.get_current_fig_manager()
manager.resize(*manager.window.maxsize())

figName = 'tec.map' + '.' + str(year) + '.' + str(julianday) + '.' + str(hour) + '.' + str(minute) + 'h.png'
#plt.show()
plt.savefig(figName, dpi=500)
plt.clf()

Maybe I need to set some parameter into savefig() to say it that it needs to save my modified frame? Can someone help me with this issue?

Thanks in advance.

cartopy matplotlib python
3 Answers

Just to add some context on @Mad Physicist answer. If someone is trying to use it with a new version of matplotlib, you will get an AttributeError: 'Figure' object has no attribute 'save'. You also need to be careful about when you call plt.show() otherwise you will get a blank image. You need to update the code as follow:

# Create a plot
plt.barh(range(top), imp, align='center')
plt.yticks(range(top), names)

# Get the current figure like in MATLAB
fig = plt.gcf()
plt.show() # show it here (important, if done before you will get blank picture)
fig.set_size_inches((8.5, 11), forward=False)
fig.savefig(figName, dpi=500) # Change is over here

Hope it helps!

user_125384670

I tried all answers above, and didn't seem to solve my problem. Maybe becase I run on Mac, but I figured it out, free to try.

import matplotlib
import numpy as np
import matplotlib.pyplot as plt

matplotlib.use('TkAgg')

"""work on macos"""


def test():
    x = list(range(10))
    y = list(range(10))
    fig, ax = plt.subplots()
    ax.plot(x, y, linewidth=1.0)

    mng = plt.get_current_fig_manager()
    mng.resize(*mng.window.maxsize())
    figure = plt.gcf()
    plt.show()
    figure.savefig('test.png')


if __name__ == "__main__":
    test()
user_100202710
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