Left - Rigth - double click on a plo

Hi guys,

I am confuse using the get(fig,'SelectionType').

What I want to do is really simple:

if get(fig,'SelectionType') == 'open';

do an operation

elseif get(fig,'SelectionType') == 'alt'

do another operation

end

as simple as that, but I have not been able to do it.

thanks for your help

carlos

Answer 1

[Jan]

get(fig,'SelectionType') replies a string. This is a vector of type char. When you compare two vectors, they must have the same length:

'123' == '1234'   % ERROR!

To compare strings, use strcmp:

if strcmp(get(fig,'SelectionType'), 'open')

or a switch block:

switch get(fig,'SelectionType')
case 'open'
  ...
otherwise
  warning('SelectionType not caught')
end

[Carlos]

Ok, I guess I am doing something wrong with the handlers.

I set-up a figure with two reference vectors.

 F1=figure('Color',[1 1 1]);
 axes1 = axes('Parent',F1,'FontSize',16);
 F1(1)=plot(time,xdata, '-or');hold on
 F1(2)=plot(time,xdata1,'-og');

Then I have a collection of points that I want to check in the figure using the just plotted reference vector: Point1, point2, point3, ..., pointN

 points=[xcoordinate1 ycoordinate1
         xcoordinate2 ycoordinate2
                    ...
         xcoordinateN ycoordinateN]

This matrix has a size of N by 2

My idea is to check (point by point) in the plot if the points are in the place (location) where I want them to be. If the point is where I want it to be,I should double click in the figure and this action should plot the point in yellow. If the point is 'wrong', i want to press the left mouse click and this should delete the point.

I thought to do something like this. But obviously is wrong...

 for X=1:size(points,1)

 F(3)=plot(points(X,1), points(X,2),'or')

 switch get(F1,'SelectionType')
 case 'open'
   F1(3)= plot(point(1), point(2), 'oy') %%plot the point in yellow as an indication is 'Right'
 case 'alt'
   delete(F1(3)) %%delete the point, it is wrong.

 otherwise
   warning('SelectionType not caught')
 end
 end

But this is not working, I am confuse with the use of the handlers. I guess !!!

[Jan]

"Is not working" is a bad description of a problem. Please explain the necessary details ever, in every case, under all circumstances. I cannot guess, why in "get(F1, 'SelectionType')" the variable F1 seems to be the figure handle, while in "F1(3)" F1 seems to be a vector.

Answer 2

[Matt Fig]

Look at this example for how to use this property.

function [] = figselect()
% Click in the axes
figure('windowbuttondownfcn',@fwbdfcn)
axes

function [] = fwbdfcn(varargin)

if strcmp('alt',get(gcbf,'selectiontype'))
    disp('Alt used')
else
    disp('Alt not used')
end

.

.

.

. EDIT

Here is a more interactive form. Either left or right click on any of the dots. Note that one might want to put more checks on gco.

function [] = figselect()

figure('windowbuttondownfcn',@fwbdfcn)
[X,Y,Z] = cylinder(1,500);
plot(X(1,:),Y(1,:))
hold on
for ii = 1:10
    plot(rand,rand,'*k')
end
axis square

function [] = fwbdfcn(varargin)

if strcmp(get(gco,'type'),'axes')
    return
end

if strcmp('alt',get(gcbf,'selectiontype'))
    delete(gco)
else
    set(gco,'color','r')
end