is there any function similare to pixelinfo but for pcolor ?

is there any function similare to pixelinfo but for pcolor ?

Answer 1

[Rahul]

Hi @Rabih Sokhen,

While there is no direct function which provides the functionality of 'impixelinfo' function for 'pcolor'. However, a similar functionlity can be achieved using by defining a 'hoverCallback' function to the 'WindowButtonMotionFcn' property. Here is an example:

[X, Y, Z] = peaks(25); % Taking some example data
h = pcolor(X, Y, Z);

% Setting up the figure to respond to mouse motion
set(gcf, 'WindowButtonMotionFcn', @(src, event) hoverCallback(src, event, X, Y, Z));

function hoverCallback(~, ~, X, Y, Z)
    % Get the current point in the axes
    ax = gca;
    cp = ax.CurrentPoint;
    x = cp(1,1);
    y = cp(1,2);

    % Find the closest data point
    [~, xi] = min(abs(X(1,:) - x));
    [~, yi] = min(abs(Y(:,1) - y));

    % Display the Z value at the closest point
    if xi > 0 && yi > 0 && xi <= size(Z, 2) && yi <= size(Z, 1)
        zValue = Z(yi, xi);
        title(ax, sprintf('X: %.2f, Y: %.2f, Z: %.2f', X(yi, xi), Y(yi, xi), zValue));
    end
end

The following MATLAB Answers can also be referred:

https://www.mathworks.com/matlabcentral/answers/712873-how-to-get-windowbuttonmotionfcn-to-track-mouse-position

https://www.mathworks.com/matlabcentral/answers/97563-how-do-i-continuously-read-the-mouse-position-as-the-mouse-is-moving-without-a-click-event

Refer to the following MathWorks documentations to know more:

'pcolor': https://www.mathworks.com/help/releases/R2024a/matlab/ref/pcolor.html

'Create Callbacks for Graphic Objects': https://www.mathworks.com/help/matlab/creating_plots/create-callbacks-for-graphics-objects.html

Hope this helps! Thanks.