How to do animation properly

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Joris Naudin
Joris Naudin on 29 Nov 2019
Edited: Joris Naudin on 6 Dec 2019
Hi,
I know this has been asked several times in similar topics but I still can't figure it out:
I want to animate a piston moving, it's just a x(t) coordinates with a rectangular shape around that represents the cylinder.
The way I did it works but there's a better way to do it (with "draw now" or something). Especially because my animation is either too slow, or too laggy. Ideally, I'd like to have a smooth animation which I can easily change the speed (i.e. real time, x0.5 slow motion, x2 speed up, ...).
How can I do that ?
Thanks ! Cheers
Here's the code that I did:
DATA.INPUT.ENGINE.Bore = 0.08;
DATA.INPUT.GEN.Stroke = 0.5;
DATA.OUTPUT.Position = 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TIME = 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figure(8)
i = 1;
N = length(TIME);
Step = 1e1;
for t = 1:Step:N
% PISTON POSITION
y_Piston = linspace(-DATA.INPUT.ENGINE.Bore/2, DATA.INPUT.ENGINE.Bore/2, 100);
x_Piston = DATA.OUTPUT.Position(t);
plot(x_Piston, y_Piston, 's', 'MarkerSize', 10, 'MarkerFaceColor', 'r', 'MarkerEdgeColor', 'r')
hold on
% CYLINDER
x_Cyl = [0 0 DATA.INPUT.GEN.Stroke DATA.INPUT.GEN.Stroke 0 0];
y_Cyl = [-DATA.INPUT.ENGINE.Bore/2 DATA.INPUT.ENGINE.Bore/2 DATA.INPUT.ENGINE.Bore/2 -DATA.INPUT.ENGINE.Bore/2 -DATA.INPUT.ENGINE.Bore/2 DATA.INPUT.ENGINE.Bore/2];
plot(x_Cyl, y_Cyl, 'k-', 'LineWidth', 8)
xlim([-0.1 DATA.INPUT.GEN.Stroke+0.1]);
ylim([-DATA.INPUT.GEN.Stroke/2-0.1 DATA.INPUT.GEN.Stroke/2+0.1]);
% END
title(['TIME = ', num2str(TIME(t)), ' s'])
FontStyle = {'interpreter','latex'};
xlabel('$POSITION [m]$', FontStyle{:})
anim(i) = getframe;
i = i+1;
hold off
end

Accepted Answer

J Chen
J Chen on 29 Nov 2019
Draw the cylinder first. Use the "rectangle" command in a loop to draw the piston, e.g.,
rectangle('position',[x,y,w,h],'FaceColor',[1 0 0],'EdgeColor',[1 0 0])
Update only the position of the rectangle object using the following commands
h = gca;
h.Children.Position = [x_new,y_new,w,h];
  1 Comment
Joris Naudin
Joris Naudin on 6 Dec 2019
Edited: Joris Naudin on 6 Dec 2019
Hi thank you for your answer.
It returns an error when I use "h.Children.Position" so I tried with just "Rectangle.Position" then it worked!
Thanks
x_Piston = DATA.INPUT.RUN.x0 * DATA.INPUT.GEN.Stroke;
y_Piston = - DATA.INPUT.ENGINE.Bore/2;
PistonWidth = 1e-2;
PistonHeight = DATA.INPUT.ENGINE.Bore;
Piston = rectangle('position',[x_Piston,y_Piston,PistonWidth,PistonHeight],'FaceColor',[1 0 0],'EdgeColor',[1 0 0]);
Step = 500;
for t = 1:Step:1000%length(TIME)
x_Piston = DATA.OUTPUT.Position(t);
h = gca;
Piston.Position = [x_Piston, y_Piston, PistonWidth, PistonHeight];
pause(1)
end

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