How to make an image appear in different locations

I want to do this , can someone help please,

expl: a ball (or an image) appears in random locations on the screen, when it appears(each time in different place), the user must click with the mouse , when he click the image disapear

thank you for your help

[Adam Danz]

How can we help with that project? On which steps are you stuck?

[Adam Danz]

Use a ButtonDownFcn (Button down function). I could be more specific if I knew what object the "image" is (is it really an image or a scatter dot, etc?).

[Adam Danz]

Is it plotted in an axes?

[Adam Danz]

Displaying an image in an axes sounds like a good start.

But again, I don't know how to help, what the question is, where you're stuck, etc.

Thank you for providing the code - I'm sure this will come in handy. But what's missing is your explicit question or problem.

[Walter Roberson]

xy = ginput();

can be used to fetch coordinates. Then you can

im = image(I, 'XData', x + [0, size(I,2)], 'YData', y + [0, size(I,1)] );

This assumes that you want one data unit per pixel; if not then you would need to scale the output of size() according to the pixels-per-unit that was appropriate.

[Adam Danz]

Also see the CurrentPoint property of axes which can be combined with a button down function. But @Walter Roberson's ginput suggestion may be simplest.

[Rik]

Deleted thread:

How to make an image appear in different locations

I want to do this , can someone help please,

expl: a ball (or an image) appears in random locations on the screen, when it appears(each time in different place), the user must click with the mouse , when he click the image disapear

thank you for your help

OP on 12 Jul 2022

Thank you for your answer,

when the image is displayed, how can the user press to the mouse to disappears ?

OP on 13 Jul 2022

it's an image jpg , i want to diplayed in different places each time, when the user see it , he click with the mouse

OP on 27 Jul 2022 at 7:45

my problem is i want to identify the position of the mouse click (when the user click to the image ) and the time when he click if it's possible

[Rena Berman]

(Answers Dev) Restored edit

Answer 1

[Jonas]

you can try this raw code, how often the image can change the position is defined in the function

close all;
clear all;
im=imread('peppers.png');

width=0.2;
height=0.3;

fig=figure('Visible','off'); im=imshow(im,'Border','tight'); im.HitTest='off';
fig.ButtonDownFcn=@(src,~) handleClick(src,width,height);

set(fig,'Units','normalized','Position',[0.4 0.4 width height],'MenuBar','none','NumberTitle','off','Visible','on');
set(gca,'Units','normalized','InnerPosition',[0 0 1 1]);

function handleClick(src,width,height)
    persistent howManyTimes;
    
    if isempty(howManyTimes)
        howManyTimes=10;
    end

    if howManyTimes>0
        newX=(1-width)*randi([0 100])/100;
        newY=(1-height)*randi([0 100])/100;
        src.Position=[newX newY width height];

        howManyTimes=howManyTimes-1;
    else
        close(src);
    end
end

condensed version:

close all;
clear all;

im=imread('peppers.png');

width=0.2;
height=0.3;

fig=figure('Visible','off'); % hide window first
im=imshow(im,'Border','tight'); im.HitTest='off'; % plot and interpret klick on th eimage as click on the figure
fig.ButtonDownFcn=@(src,~) handleClick(src,width,height); % set action on button click

set(fig,'Units','normalized','Position',[0.4 0.4 width height],'Visible','on'); % edit position of figure and set visible

function handleClick(src,width,height)
    persistent howManyTimes;
    
    if isempty(howManyTimes)
        howManyTimes=10;
    end

    if howManyTimes>0
        newX=(1-width)*randi([0 100])/100; % create random x position with 101 possible values between 0 and (1-width)
        newY=(1-height)*randi([0 100])/100; % create random y position with 101 possible values between 0 and (1-height)
        src.Position=[newX newY width height];

        howManyTimes=howManyTimes-1;
    else
        close(src); % close window if we reached the howManyTimes==0
    end
end