get on click coordinates from a plot (multiple times)

Question

Max Müller 2014-9-10

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/154266-get-on-click-coordinates-from-a-plot-multiple-times

评论： Max Müller 2014-9-11

Heyho,

the function [x,y]= ginput (n) gives back the x and y data of the curse position while clicking. The Problem: I want to give the user the possibility to click multiple times in a row. However, I need the click to have a direct effect.

So if n>1 the function waits for n clicks to be done before returning the x/y Data.I want to click --> get Values --> click --> get values --> click on the button --> finish. My idea was to use a Pushbutton which sets the ginput into an eternal loop, which can be broken be clicking agian.

function CollectePointsButton_Callback(hObject, eventdata, handles) 
           Counter = getappdata(hObject,'Counter');
           if isempty(Counter) == 1;
           Counter = 0;
           end
           Data = findobj('type','axes');
           set(Data,'buttondownfcn',@ClickToCollecte); 
           Counter = Counter +1;
           setappdata(handles.CollectePointsButton,'Counter',Counter);
 function ClickToCollecte (gcbo,evendata,handles) 
                          Data = findobj('tag','CollectePointsButton');
                          Counter = getappdata(Data,'Counter') 
                           while mod(Counter,2) == 1
                           Data = findobj('tag','CollectePointsButton');
                           Counter = getappdata(Data,'Counter') 
                           [x,y] = ginput(1);
                            end

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Answer 1

Mischa Kim 2014-9-10

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/154266-get-on-click-coordinates-from-a-plot-multiple-times#answer_151268

Hello Max, check out this answer.

It uses left-mouse clicks to collect data and a right-mouse click to finish collecting data.

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Mischa Kim 2014-9-11

ginput reads position values as long as you keep using the left-mouse button ( button = 1 ). As soon as you use the right-mouse button, button = 3, and the loop is exited.

Max Müller 2014-9-11