Geoaxes Interactive Drawing Issue

I created fucntion that plots something (in this example, it is sinusoid, but it doesnt matter) and by holding left button on mouse i can draw over it. Now, I want the same thing, but when I use geoplot in geoaxes, but I don't know how to do it. Can someone help me?

Example of code with regular axes:

function draw_on_figure()
x = linspace(0, 2*pi, 100);
y = sin(2*x);
figure('WindowButtonDownFcn', @startDrawing, ...
    'WindowButtonMotionFcn', @draw, ...
    'WindowButtonUpFcn', @stopDrawing);
plot(x, y, 'b', 'LineWidth', 2); 
hold on; 
axis([0 2*pi -1.5 1.5]);
grid on;

isDrawing = false;
lineHandle = [];
    function startDrawing(~, ~)
        if strcmp(get(gcf, 'SelectionType'), 'normal') % normal - left click
            isDrawing = true;
            currentPoint = get(gca, 'CurrentPoint');
            lineHandle = line(currentPoint(1, 1), currentPoint(1, 2), ...
                'Color', 'r', 'LineWidth', 2);
        end
    end
    function draw(~, ~)
        if isDrawing
            % current position of the mouse
            position = get(gca, 'CurrentPoint');
            x = get(lineHandle, 'XData');
            y = get(lineHandle, 'YData');
            set(lineHandle, 'XData', [x, position(1, 1)], ...
                'YData', [y, position(1, 2)]);
        end
    end
    function stopDrawing(~, ~)
        isDrawing = false;
        lineHandle = [];
    end
end

Answer 1

[Walter Roberson]

I suspect the code would look like this:

%assumes the geoplot already exists
function draw_on_geofigure()

fig = gcf;
set(fig, 'WindowButtonDownFcn', @startDrawing, ...
    'WindowButtonMotionFcn', @draw, ...
    'WindowButtonUpFcn', @stopDrawing);

isDrawing = false;
lineHandle = [];
    function startDrawing(~, ~)
        if strcmp(get(gcf, 'SelectionType'), 'normal') % normal - left click
            isDrawing = true;
            currentPoint = get(gca, 'CurrentPoint');
            lineHandle = geoplot(currentPoint(1, 1), currentPoint(1, 2), ...
                'Color', 'r', 'LineWidth', 2);
        end
    end
    function draw(~, ~)
        if isDrawing
            % current position of the mouse
            position = get(gca, 'CurrentPoint');
            x = get(lineHandle, 'LongitudeData');
            y = get(lineHandle, 'LatitudeData');
            set(lineHandle, 'LongitudeData', [x, position(1, 1)], ...
                'LatitudeData', [y, position(1, 2)]);
        end
    end
    function stopDrawing(~, ~)
        isDrawing = false;
        lineHandle = [];
    end
end

[Andrija]

Thank you for idea! I changed some thihngs and now it works perfect. Code example below:

function draw_on_geofigure()

fig = gcf;

set(fig, 'WindowButtonDownFcn', @startDrawing, ...

'WindowButtonMotionFcn', @draw, ...

'WindowButtonUpFcn', @stopDrawing);

geoplot(20.12345,19.223366,'rx','MarkerSize',10,'LineWidth',1.5)

hold on

geolimits([20 21],[19 20])

isDrawing = false;

lineHandle = [];

function startDrawing(~, ~)

if strcmp(get(gcf, 'SelectionType'), 'normal') % normal - left click

isDrawing = true;

currentPoint = get(gca, 'CurrentPoint');

lineHandle = geoplot(currentPoint(1, 1), currentPoint(1, 2), ...

'Color', 'r', 'LineWidth', 2);

end

end

function draw(~, ~)

if isDrawing

% current position of the mouse

position = get(gca, 'CurrentPoint');

x = get(lineHandle, 'LongitudeData');

y = get(lineHandle, 'LatitudeData');

set(lineHandle, 'LongitudeData', [x, position(1, 2)], ...

'LatitudeData', [y, position(1, 1)]);

end

end

function stopDrawing(~, ~)

isDrawing = false;

lineHandle = [];

end

end