Created
February 28, 2018 02:10
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Simple example to show how to generate animation efficiently in Matlab and output a gif
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| N = 100; | |
| x = linspace(0,2*pi,N); | |
| y = sin(x); | |
| %% Initialization | |
| % set up first frame | |
| figure('Color', 'white'); | |
| % plot the 'background' | |
| plot(x, y, 'LineWidth', 1); | |
| % set up the markers that move | |
| h = line(x(1),y(1),'Marker', 'o', 'MarkerSize', 5); | |
| % set up axes size | |
| xlim([0 2*pi]); | |
| ylim([-2 2]); | |
| % get figure size | |
| pos = get(gcf, 'Position'); | |
| width = pos(3); height = pos(4); | |
| % preallocate data (for storing frame data) | |
| mov = zeros(height, width, 1, length(N), 'uint8'); | |
| %% Method 1: update XData and YData | |
| for i = 1:N | |
| set(h, 'XData', x(i)); | |
| set(h, 'YData', y(i)); | |
| drawnow update | |
| % get frame as an image | |
| f = getframe(gcf); | |
| % create a colormap for the first frame. For the rest of the frames, | |
| % use the same colormap | |
| if i == 1 | |
| [mov(:,:,1,i), map] = rgb2ind(f.cdata, 256, 'nodither'); | |
| else | |
| mov(:,:,1,i) = rgb2ind(f.cdata, map, 'nodither'); | |
| end | |
| end | |
| % Create animated GIF | |
| imwrite(mov, map, 'animation.gif', 'DelayTime', 1/60, 'LoopCount', inf); | |
| %% | |
| % *Animated GIF* | |
| % | |
| % <<../animation.gif>> |
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