add a moving image over a plotted trajectory

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x = 0:pi/100:2*pi;
y = sin(x);
plot(x, y);
%i want my image to move in this way
alpaca = 'alpaca.png';
[I,map,transparency] = imread(alpaca);
%i have this code to remove the background of my image
%i tried using image sc but i couldnt get it to work
%thank you!
  3 Commenti
Sumit
Sumit il 11 Ott 2023
Please check attachment. according to that i want multiple image (stationary) along trajectory. How it can be done

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Risposta accettata

DGM
DGM il 7 Mag 2022
Modificato: DGM il 8 Mag 2022
Assuming you actually want it to move in real time, this should be a start
x = 0:pi/100:2*pi;
y = sin(x);
plot(x, y); hold on
%i want my image to move in this way
fname = 'alpaca.png';
[inpict,~,alpha] = imread(fname);
inpict = flipud(inpict); % necessary to keep image upright
alpha = flipud(alpha);
imgsize = [0.7 0.8]; % [x y] in plot coordinates
% get current coordinates for the image
xx = [-0.5 0.5]*imgsize(1) + x(1);
yy = [-0.5 0.5]*imgsize(2) + y(1);
hi = image(xx,yy,inpict);
hi.AlphaData = alpha; % set alpha
% enforce axes extents
axis equal
xlim([0 2*pi] + [-0.5 0.5]*imgsize(1))
ylim([-1 1] + [-0.5 0.5]*imgsize(2))
for k = 1:numel(x)
hi.XData = [-0.5 0.5]*imgsize(1) + x(k);
hi.YData = [-0.5 0.5]*imgsize(2) + y(k);
% wait
pause(0.02)
end
  5 Commenti
DGM
DGM il 11 Lug 2022
Is the rectangle following a predetermined path, or is it appearing in random locations? The latter case is likely less complicated to implement.
Either way, it's probably best to open a new question for this. If you're intending to do this with Psychtoolbox, make sure to mention your intent.
ss
ss il 12 Lug 2022
Thank you for your answer, yes it can be random locations

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Più risposte (1)

Voss
Voss il 7 Mag 2022
Something like this?
x = 0:pi/100:2*pi;
y = sin(x);
figure();
plot(x, y);
hold on
xlim([0 2*pi]);
ylim([-1 1]);
I = imread('alpaca.png');
im = image(I,'XData',[0 1],'YData',[0 1]);
for ii = 1:numel(x)
set(im,'XData',x(ii)+[-0.5 0.5],'YData',y(ii)+[-0.5 0.5]);
drawnow();
end
  5 Commenti
Voss
Voss il 5 Lug 2022
Modificato: Voss il 5 Lug 2022
Try doing
clear image
and then running it again.
That is, you may have a variable called image in your workspace that needs to be cleared before you can use the image function.
ss
ss il 5 Lug 2022
yes it works! thank you a lot

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Release

R2021b

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