how to stop while loop by right mouse button click

Question

Sergey Lopatnikov 2017-2-18

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/325754-how-to-stop-while-loop-by-right-mouse-button-click

编辑： Stephen23 2017-2-19

I would like to stop execution of the while loop by pressung right-click button. I wrote small function to pickup point from graph:

function y=graph_scan_ext (Name,Title,Xax,Yax,u,v)
Name=Name;
Tit=Title;
Xax=Xax;
Yax=Yax;
mainfg=figure();
mainax=axes();
htxt=uicontrol('Style','Text');
set(mainfg,'Name',Name,'NumberTitle','off');
x=u;
y=v;
plot(mainax,x,y);
title(Tit);
xlabel(Xax);
ylabel(Yax);
hold;
mark=0;
q=[];
while mark==0;
    c=ginput(1);
    scatter(c(1),c(2));
    q=[q;c];
  prompt = 'To continue press Enter; To stop, press any other key:';
  str=input(prompt,'s');
if isempty(str)==0
   mark=1;
   y=q;
end
end
---------------

I works, but every time you need to confirm that you want to continue by pressing Enter or stop by pressing any other key.

My goal is to replace "key" action with simply right click of mouse button to stop while execution and do nothing to continue. I tried to change "while loop" like this:

while mark==0;
    set(mainfg,'SelectionType','normal');
    c=ginput(1);
    scatter(c(1),c(2));
    q=[q;c]
  set(mainfg,'Selectiontype','alt');
set(mainfg,'WindowButtonDownFcn',@RightButDownFcn)
function click=RightButDownFcn(mainfg,event_data);
   break;
 end
y=q;
end

And got

Error: File: graph_scan_rc.m Line: 36 Column: 1
Function definition is misplaced or improperly nested.

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Answer 1

Walter Roberson 2017-2-19

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/325754-how-to-stop-while-loop-by-right-mouse-button-click#answer_255387

在 MATLAB Online 中打开

ax = gca;
fig = ancestor(ax, 'figure');
q = [];
hold(ax, 'on');
while true
  c = ginput(1);
  sel = get(fig, 'SelectionType');
  if strcmpi(sel, 'alt'); break; end
  scatter(c(1),c(2));
  q=[q;c]
end
hold(ax, 'off')

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Sergey Lopatnikov 2017-2-19

编辑：Stephen23 2017-2-19

Thank you, it works perfectly.

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Answer 2

Chad Greene 2017-2-18

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/325754-how-to-stop-while-loop-by-right-mouse-button-click#answer_255372

在 MATLAB Online 中打开

From an old answer by Jose-Luis,

f = figure(1);
click_type=get(f,'SelectionType');
if strcmp(click_type,'normal') %right click
   %Do some stuff
elseif strcmp(click_type,'alt') %left click
   %Do some other stuff
end