Matlab GUI. How can i make an animated dot in a parabola in a 1 by 1 plane?

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Ariel Goya 2019-4-4

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评论： Andreas Bernatzky 2019-4-4

Hi everyone, I need help to do an animated dot. but instead of a straight line, i need to do it in a parabola in a 1 by 1 plane. How can I code this?

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Image Analyst 2019-4-4

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Not sure what a 1 by 1 plane, but did you try plotting with just . instead of -?

Instead of

plot(x, y, 'b-');

try

plot(x, y, 'b.', 'MarkerSize', 18);

Ariel Goya 2019-4-4

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i am sorry, i meant in a x and y axes plane. so far i made the dot to move in a straight line, but i need it to move in a parabola.

a = [0,   0];
b = [ 1 , 1];
% straight line function from a to b
func = @(x)b(1) + (b(1)-a(1))/(b(1)-a(1))*(x-b(1));
% determine the x values
x = linspace(a(1),b(1),800);
% determine the y values
y = func(x);
% create the figure
figure;
% get a handle to a plot graphics object
hPlot = plot(0,0,'r*');
% set the axes limits
xlim([min(a(1),b(1)) max(a(1),b(1))]);
ylim([min(a(1),b(1)) max(a(1),b(1))]);
% iterate through each point on line
for k=1:length(x)
    % update the plot graphics object with the next position
    set(hPlot,'XData',x(k),'YData',y(k));
    % pause for 0.5 seconds
    pause(0.005);
end

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Answer 1

Andreas Bernatzky 2019-4-4

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Hey Ariel,

with a 1by1 plane you mean a simple xy plane?

Here a rough example. You should consider the command draw now.

x=-10:0.1:10;
y=x.^2+x+1;
for(xmom=x(1):0.1:10)
plot(x,y);
hold on
ymom=xmom.^2+xmom+1;
plot(xmom,ymom,'-o');
pause(0.1);
clf;
end

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Ariel Goya 2019-4-4

Thank you Andreas, it worked i just need to plot an image instead of a dot, and also i need the line to be transparent.

Andreas Bernatzky 2019-4-4

Transparency should be easy: https://de.mathworks.com/help/matlab/ref/alpha.html

Ploting an image with variable position I am not really familiar with this. I just used

https://de.mathworks.com/help/images/ref/imshow.html once and it worked for me. But my application had not a moving image. But I think you should be able to manipulate the image position by the Position handle of an object in a figure. Thats what I would try first.

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