MATLAB Graph: Animation

This post just shows how a simple animation is constructed.

Two ways to create animated sequence:

• save a number of different pictures and then play them back as a movie
• continuously erase & redraw the object on screen

Remember, a movie is not rendered in real time, it is just a playback of previously rendered frames.

Two steps to "save & replay":

1. use "getframe" to generate each movie frame
2. use "movie" to run the movie

when one use "getframe" two properties are returned:

1. cdate: Image data in a uint8 matrix: The matrix has dimensions of height-by-width on indexed-color systems and height-by-width-by-3 on truecolor systems
2. colormap:  The colormap in an n-by-3 matrix, where n is the number of colors. On truecolor systems, the colormap field is empty. 

Example:

h = uicontrol('style','slider','position',...

    [10 50 20 300],'Min',1,'Max',16,'Value',1)

for k = 1:16

    plot(fft(eye(k+16)))

    axis equal

    set(h,'Value',k)

    M(k) = getframe(gcf);

end

clf

axes('Position',[0 0 1 1])

movie(M,30)