User input during animation
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I have created an animation that graphs the motion of a test particle under the influence of a force field in 2D and I want to add a user interface. I'd like the user to be able to nudge the test particle by using the keyboard, e.g. the arrow keys. I'd like the user input to be interpreted as a variable in the program, so it can be added to the internal variables that are being graphed. I'd like this to happen without interrupting the animation. How might this be possible to accomplish in Matlab?
Ted
댓글 수: 2
Jan
2021년 6월 30일
It depends on how you have implemented the animation yet. Is it an animated GIF, a figure or uifigure with a loop? Is it a simulink application?
답변 (1개)
Walter Roberson
2021년 7월 1일
Use a WIndowsKeyPressFcn callback, and check the event information to figure out which key was pressed in order to figure out what changes to make to your variables. Use one of the methods of sharing variables to get the data to the compute loop.
Your compute loop will need to periodically pause() or drawnow() to receive the interrupts, but it has to use one of those to make the animation visible anyhow.
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Walter Roberson
2021년 7월 3일
function fig1_key_callback(hObject, event, handles)
xv = handles.particle_xv;
yv = handles.particle_yv;
switch event.Key
case 'leftarrow'
xv = xv - 5;
case 'rightarrow'
xv = xv + 5;
case 'uparrow'
yv = yv + 5;
case 'downarrow'
yv = yv - 5;
case 'q'
handles.quit = true;
otherwise
%do nothing
end
handles.particle_xv = xv;
handles.particle_yv = yv;
guidata(hObject, handles)
end
function processing_loop(hObject, event, handles)
%stuff
handles.x = x0; handles.y = y0; handles.quit = false;
handles.xv = randi([-10 10]); handles.yv = randi([-10 10]);
guidata(hObject, handles);
h = animatedline(handles.x, handles.y);
while true
handles = guidata(hObject); %pull back updates to handles
if handles.quit
handles.quit = false;
break;
end
handles.x = handles.x + handles.xv;
handles.y = handles.y + handles.yv;
addpoints(h, handles.x, handles.y);
guidata(hObject, handles);
pause(0.05);
end
end
In this demonstration, the user does not control the x or y position directly, and instead affects the velocity, nudging it higher or lower (including negative).
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