Transform coordinates into pixel

Hi ..

I am generating an animation of two eliptical trajectories. The animation have 100 timesteps and for each timestep, I point the x, y coordinates for both objects.

I need to save this animation as frames of a movie. So, I need to get this x, y positions and transform it to a 3D array (r,c,t),. In any given time t, I can acess the grid of pixels made of r x c pixels.

Is there any easy way of doint that? Any ideas?

Thanks

Ps: Here is the animation code:

%%
clear; close all


start_angle = -120;
%

%1 turn as the same trajectory% 5 turns diverging
turns_same = 1;
turns_diverge = 5 ;

frames = 100;

t_same = 50;
t = linspace(start_angle,start_angle+(turns_same + turns_diverge )*( start_angle + 360 ), frames) ;
xh(1:t_same) = 20.*cosd( t (1:t_same)  )  ; xg = xh  ;
yh(1:t_same) = 10.*sind( t (1:t_same) ) ;  yg = yh ;

rgx = linspace(20,30,length(t)-t_same) ; rgy = linspace(10,20,length(t)-t_same) ;
xh = [xh 20.*cosd( t(t_same+1:end  ))]  ; xg = [xg rgx.*cosd(t(t_same+1:end )) ] ;
yh = [yh 10.*sind( t(t_same+1:end) ) ];  yg = [yg rgy.*sind(t(t_same+1:end )) ];

figure;
g =  plot(xg(1),yg(1),'g-',xg(1),yg(1),'go', 'MarkerFaceColor', 'g', 'MarkerSize',12) ;
hold on; 
h = plot(xh(1),yh(1),'r-',xh(1),yh(1),'ro', 'MarkerFaceColor', 'r', 'MarkerSize', 12) ;

axis([-30 30 -30 30 ]) ;
pause(0.5) ;


for ii=1:numel(xh)

        % update plots
        set(h(1),'xdata',xh(1: ii),'ydata',yh(1:ii)) ;
        set(h(2),'xdata',xh(ii),'ydata',yh(ii)) ;
        set(g(1),'xdata',xg(1: ii),'ydata',yg(1:ii)) ;
        set(g(2),'xdata',xg(ii),'ydata',yg(ii)) ;
        pause(0.1) ; drawnow ; % visibility
  
end

Answer 1

[Matt J]

Use getframe and writeVideo like in this example:

https://www.mathworks.com/help/matlab/ref/videowriter.writevideo.html#mw_6dabd75d-5e65-4d5f-acc4-343804fe8ac5