Matlab: Videowriter creates video with only section of figure

问题

I made a script that plots an animation of the orbit of Phobos, MEX and MAVEN spacecraft around Mars. I want a video of this animation. It works almost perfect but for some reason the video created is a zoom of the animation in Matlab and I can't figure out why.

This is my code (Ignore everything with cspice, this is a toolbox to receive positions of objects in space):

clear

%Load kernels
cspice_furnsh( 'de421.bsp' )
cspice_furnsh( 'MAR085.BSP' )
cspice_furnsh( 'maven_v03.tf' )
cspice_furnsh( 'MEX_130305_STEP.TSC' )
cspice_furnsh( 'MEX_V11.TF' )
cspice_furnsh( 'MVN_SCLKSCET.00000.tsc' )
cspice_furnsh( 'NAIF0010.TLS' )
cspice_furnsh( 'ORMF_______________00880.BSP' )
cspice_furnsh( 'PCK00010.TPC' )
cspice_furnsh( 'spk_m_141027-151027_110526.bsp')
cspice_furnsh( 'ORMM__150301000000_01138.BSP' )

% Flyby 09 APR 2015    
    ETbegin = cspice_str2et( '2015-04-09T06:30:00' );
    ETend = cspice_str2et( '2015-04-09T14:10:00' );

% Generation of calculation input array
    interval_ET=[ETbegin:1:ETend];

% Computation of positions of MAVEN, MEX and Phobos in reference to Mars
    position_MAVEN_Mars = cspice_spkpos...
        ( 'maven', interval_ET, 'J2000', 'none', 'mars' );
    position_MEX_Mars = cspice_spkpos...
        ( 'mex', interval_ET, 'J2000', 'none', 'mars' );
    position_Phobos_Mars = cspice_spkpos...
        ( 'phobos', interval_ET, 'J2000', 'none', 'mars' );

MEX_x = position_MEX_Mars(1,:);
MEX_y = position_MEX_Mars(2,:);
MEX_z = position_MEX_Mars(3,:);
MAVEN_x = position_MAVEN_Mars(1,:);
MAVEN_y = position_MAVEN_Mars(2,:);
MAVEN_z = position_MAVEN_Mars(3,:);
PHOBOS_x = position_Phobos_Mars(1,:);
PHOBOS_y = position_Phobos_Mars(2,:);
PHOBOS_z = position_Phobos_Mars(3,:);

writerObj = VideoWriter('video_flyby.avi');
writerObj.FrameRate = 30;
writerObj.Quality = 100;
open(writerObj);

figure
plot3(0,0,0,'ro-',MEX_x,MEX_y,MEX_z,'b',...
                  MAVEN_x,MAVEN_y,MAVEN_z,'r',...
                  PHOBOS_x,PHOBOS_y,PHOBOS_z,'k');
legend('Mars','MEX','MAVEN','Phobos');
xlabel('X-axis (km)');
ylabel('Y-axis (km)');
zlabel('Z-axis (km)');
xlim([-20000 20000]);
view([47.5 32]);
grid on;
hold on;
m1 = plot3(MEX_x(1),MEX_y(1),MEX_z(1),'b*','MarkerSize',10);
m2 = plot3(MAVEN_x(1),MAVEN_y(1),MAVEN_z(1),'r*','MarkerSize',10);
m3 = plot3(PHOBOS_x(1),PHOBOS_y(1),PHOBOS_z(1),'k*','MarkerSize',10);
axis tight
set(gca,'nextplot','replacechildren');
set(gcf,'Renderer','zbuffer');
for n = 1:100:numel(PHOBOS_x)
    set(m1, 'XData', MEX_x(n), 'YData', MEX_y(n), 'ZData', MEX_z(n));
    set(m2, 'XData', MAVEN_x(n), 'YData', MAVEN_y(n), 'ZData', MAVEN_z(n));
    set(m3, 'XData', PHOBOS_x(n), 'YData', PHOBOS_y(n), 'ZData', PHOBOS_z(n));
    drawnow;
    frame = getframe;
    writeVideo(writerObj,frame);
end

close(writerObj);

% Unload kernels
cspice_kclear;

This what the result looks like in Matlab.

And this is what a full frame of the video looks like.

回答1:

If you use getframe without an argument, you only capture the current axes. Create a handle of the figure and give it as an argument to getframe. This way you will capture all the contents of the actual figure.

These are the two lines affected, just to show you the principle:

fh = figure;
frame = getframe(fh);

来源：https://stackoverflow.com/questions/31161480/matlab-videowriter-creates-video-with-only-section-of-figure

标签

matlab

animation

video

matlab-figure