Matlab的：Videowriter创建了数字只有部分视频 [英] Matlab: Videowriter creates video with only section of figure

问题描述

我做了绘制火卫一，并MEX绕火星飞船MAVEN的轨道动画的脚本。我想这个动画视频。它的工作原理几乎是完美的，但由于某些原因产生的视频是在Matlab动画的变焦和我想不通为什么。

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.

这是我的code（忽略与cspice一切，这是一个工具箱接收对象在空间中的位置）：

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;

这是什么结果看起来像在Matlab。

This what the result looks like in Matlab.

而这正是视频的全画幅模样。

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

推荐答案

如果您使用的getFrame 不带参数，只捕获当前轴。
创建人物的处理，并给它作为参数传递给的getFrame 。这样你将捕获实际数字的所有内容。

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.

这是影响了两行，只是为了告诉你的原则是：

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

fh = figure;
frame = getframe(fh);

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