Creating a movie from a figure with multiple subplots

Question

Keegan Karbach 2022-12-21

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1882827-creating-a-movie-from-a-figure-with-multiple-subplots

编辑： Keegan Karbach 2022-12-22

Hello there! I'm trying to record a movie from a figure with 4 subplots that change over a sequence. The code below runs and shows the correct figure, but when I attempt to view the movie, it only shows a black screen and finally the completed figure at the last frame. Any help would be much appreciated!

Edit: I've attached a working test file and changed the code to define the axes outside the loop. Now I get an error message:

"All 'cdata' fields with a specified 'colormap' must be two dimensional."

I have used this script to create videos that only contain one axis, so I'm sure it's something I'm missing using multiple axes...

% Set up the movie structure.
% Preallocate movie, which will be an array of structures.
% First get a cell array with all the frames.
numberOfFrames = seq_length;
hFigure = figure;
allTheFrames = cell(numberOfFrames,1);
[vidHeight, vidWidth] = size(sequence(:,:,1));
allTheFrames(:) = {zeros(vidHeight, vidWidth, 3, 'uint8')};
% Next get a cell array with all the colormaps.
allTheColorMaps = cell(numberOfFrames,1);
allTheColorMaps(:) = {zeros(256, 3)};
% Now combine these to make the array of structures.
myMovie = struct('cdata', allTheFrames, 'colormap', allTheColorMaps);
set(gcf, 'renderer', 'zbuffer');
ax1 = subplot(2,2,1);
ax2 = subplot(2,2,2);
ax3 = subplot(2,2,3);
ax4 = subplot(2,2,4);
for i = 1:seq_length
    cla reset
    imshow(sequence_ramp(:,:,i),[],'Parent',ax1);
    caxis(ax1,[0, 255]);
    title(ax1,caption)
    surf(ax2,x,y,sequence_ramp(:,:,i),'EdgeColor','none');
    caxis(ax2,[0, 255]);
	zlim(ax2,[0, 255]);
    imshow(sequence_good(:,:,i),[],'Parent',ax3);
    caxis(ax3,[0, 255]);
    title(ax3,caption + " After AOC")
    ylh = ylabel(ax3,{"Alpha " + num2str(alpha),"qThresh " + num2str(qThresh)});
    ylh.Rotation = 0;
    ylh.Position(1) = ylh.Position(1) - 25;
    surf(ax4,x,y,sequence_good(:,:,i),'EdgeColor','none');
    zlim(ax4,[0, 255]);
    caxis(ax4,[0, 255]);
    colormap('turbo');
    drawnow
	myMovie(frameIndex) = getframe(gcf);
end
% Save movie as file
promptMessage = sprintf('Do you want to save this movie to disk?');
titleBarCaption = 'Continue?';
button = questdlg(promptMessage, titleBarCaption, 'Yes', 'No', 'Yes');
if strcmpi(button, 'yes')
	% Get the name of the file that the user wants to save.
	% Note, if you're saving an image you can use imsave() instead of uiputfile().
	startingFolder = pwd;
	defaultFileName = {'*.avi';'*.mp4';'*.mj2'}; %fullfile(startingFolder, '*.avi');
	[baseFileName, folder] = uiputfile(defaultFileName, 'Specify a file');
	if baseFileName == 0
		% User clicked the Cancel button.
		return;
	end
	fullFileName = fullfile(folder, baseFileName);
	% Create a video writer object with that file name.
	% The VideoWriter object must have a profile input argument, otherwise you get jpg.
	% Determine the format the user specified:
	[folder, baseFileName, ext] = fileparts(fullFileName);
	switch lower(ext)
		case '.jp2'
			profile = 'Archival';
		case '.mp4'
			profile = 'MPEG-4';
		otherwise
			% Either avi or some other invalid extension.
			profile = 'Uncompressed AVI';
	end
	writerObj = VideoWriter(fullFileName, profile);
	open(writerObj);
	% Write out all the frames.
	numberOfFrames = length(myMovie);
	for frameNumber = 1 : numberOfFrames 
	   writeVideo(writerObj, myMovie(frameNumber));
	end
	close(writerObj);
	% Display the current folder panel so they can see their newly created file.
	cd(folder);
	filebrowser;
	message = sprintf('Finished creating movie file\n      %s.\n\nDone with demo!', fullFileName);
	uiwait(helpdlg(message));
else
	uiwait(helpdlg('Done with demo!'));
end

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Kevin Phung 2022-12-21

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1882827-creating-a-movie-from-a-figure-with-multiple-subplots#answer_1133867

在 MATLAB Online 中打开

A bit hard to test your code without sample files, but I would start by defining axes handles outside of your for-loop, along with anything else that you don't intend on changing. This would allow your loop to run more efficiently. for example, you can assign a handle to your second subplot

ax2 = subplot(2,2,2)

and plot directly to it within the for loop

for i = 1:seq_length
    surf(ax2,x,y,sequence_ramp(:,:,i),'EdgeColor','none');
end

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Keegan Karbach 2022-12-21

tester.m

I've changed the code to define the axes outside of the loop and packaged the file to attach here. When I attempt to save the figure with subplots as a movie, I get the error:

"All 'cdata' fields with a specified 'colormap' must be two dimensional."

I've used the same script to save movies with just one single axis, so I'm assuming that the problem is with the multiple axes...

请先登录，再进行评论。

Creating a movie from a figure with multiple subplots

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

回答（1 个）

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

另请参阅

类别

标签

产品

版本

Community Treasure Hunt

Creating a movie from a figure with multiple subplots

0 个评论 显示 -2更早的评论隐藏 -2更早的评论

回答（1 个）

1 个评论 显示 -1更早的评论隐藏 -1更早的评论

另请参阅

类别

标签

产品

版本

Community Treasure Hunt

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

1 个评论
显示 -1更早的评论隐藏 -1更早的评论