Plotting points simultaneously with input from figure using ginput

I have six figures on which I need to plot points on the curve. I don't know how many points I need on each figure. This is my code to get all points:

for i = 1:6
    figure(i)
    plot(SLOPE{i, 1});
    set(figure(i), 'units', 'normalized', 'outerposition', [0 0 1 1])
    xlabel('Counts', 'FontSize', 12, 'FontWeight', 'bold')
    ylabel(strcat('Slope\_', num2str(i)), 'FontSize', 12, 'FontWeight', 'bold')
    title(strcat('SLOPE \_', num2str(i)))
    hold on
    [P1, P2] = ginput(10);
    P1 = floor(P1);
    SLOPE{i, 2} = [P1, P2];
    if ~isempty(P1)
        plot(P1, SLOPE{i}(P1), 'pentagram', 'Color', 'red', 'MarkerSize', 10,...
             'LineWidth', 2, 'MarkerFaceColor', 'black');
    end
end

I don't need more than 10 points in each figure, for some figures, I don't need any points. My problem is that I want each point to be plotted after I select it. With the above code, I can see all points plotted in a figure on hitting enter after I select all points. I have tried using 'waitforbuttonpress' along with a while loop, but a click is also considered a button press. Any help would be greatly appreciated.

Thanks,

Koustubh

Answer 1

[Image Analyst]

You need to have an inner loop over the number of points

for i = 1:6
    for n = 1 : 10
         [x,y] = ginput(1); % Get one point at a time.
         plot(..........
    end
end

[Koustubh Gohad]

If I make an inner loop like this:

for i = 1:6
        for n = 1:10
            figure(i)
            plot(SLOPE{i, 1});
            set(figure(i), 'units', 'normalized', 'outerposition', [0 0 1 1])
            xlabel('Counts', 'FontSize', 12, 'FontWeight', 'bold')
            ylabel(strcat('Slope\_', num2str(i)), 'FontSize', 12, 'FontWeight', 'bold')
            title(strcat('SLOPE \_', num2str(i)))
            hold on
            [P1, P2] = ginput(1);
            P1 = floor(P1);
            SLOPE{i, 2} = [P1, P2];
            if ~isempty(P1)
                plot(P1, SLOPE{i}(P1), 'pentagram', 'Color', 'red', 'MarkerSize', 10,...
                     'LineWidth', 2, 'MarkerFaceColor', 'black');
            end
        end
end

I have to select 10 points before I can go on to the next figure. I don't know the number of points I need in a figure. I tried using a while loop before with 'waitforbuttonpress', but, it doesn't work because a mouse click and hitting enter are both considered button presses.

[Image Analyst]

No. The figure() and some other lines should not be inside the inner loop of course. Try again.

[Image Analyst]

Do you want all 10 graphs up before any clicking starts? And the user can go into any one of the 10 plots that they want and click there? If so, that's entirely different and more complicated code.

[Koustubh Gohad]

I figured it out. I needed to save those points too. For each figure, points are stored in the second column of 'SLOPE'. First column has plotting data for each figure. Much more looping needed than I anticipated.

SLOPE = cell(6, 2);

for i = 1:6
    figure(i)
    plot(SLOPE{i, 1});
    set(figure(i), 'units', 'normalized', 'outerposition', [0 0 1 1])
    xlabel('Counts', 'FontSize', 12, 'FontWeight', 'bold')
    ylabel(strcat('Slope\_', num2str(i)), 'FontSize', 12, 'FontWeight', 'bold')
    title(strcat('SLOPE INJ\_', num2str(i)))
    hold on
    TEMP = zeros(100, 1);
    for N = 1:100
        [P1, ~] = ginput(1);
        if ~isempty(P1)
            P1 = floor(P1);
        else
            P1 = 0;
        end
        TEMP(N) = P1;
        Key = get(figure(i), 'CurrentCharacter');
        if ~isempty(Key)
            break               
        end
        if ~isempty(P1)
            plot(P1, SLOPE{i}(P1), 'pentagram', 'Color', 'red', 'MarkerSize', 10,...
                 'LineWidth', 2, 'MarkerFaceColor', 'black');
        end
    end
    if length(TEMP) == 1
        SLOPE{i, 2} = [];
    else
        TEMP = sort(TEMP(1:N - 1), 'ascend');
        SLOPE{i, 2} = [TEMP, SLOPE{i, 1}(TEMP)];
    end
end

Thank you for your help!