add a moving image over a plotted trajectory

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Isobel Leikis
Isobel Leikis 2022-5-7
评论： DGM 2025-4-7
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!
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Sumit
Sumit 2023-10-11
Please check attachment. according to that i want multiple image (stationary) along trajectory. How it can be done

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采纳的回答

DGM
DGM 2022-5-7
编辑：DGM 2022-5-8
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
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Ashley
Ashley 2025-4-7
This is probably the best demonstration of a sprite being used in Matlab so far.
Is it possible to make a sprite like this which the user can drag to different areas of the grid?
DGM
DGM 2025-4-7
Probably. I'm not really sure of what the best way to do that would be. It may require setting up some interaction callbacks. I don't think I've ever tried to do this sort of thing specifically. I generally avoid interactive graphics as much as I can.

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更多回答（1 个）

Voss
Voss 2022-5-7
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
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Voss
Voss 2022-7-5
编辑：Voss 2022-7-5
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.

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