Interactive data tip specify x and y location

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Konvictus177
Konvictus177 2022-3-21
回答： Narvik 2024-9-2
Hello,
I would like to plot a heatmap or an image and use data tip where I can manually enter the x and y location in a sperate window and get the data tip displayed and/or the z-coordinate displayed in the image or in a new window.
So I would interactively enter different x and y location and always get the correspoding z value.
How can I do this?
Thanks.

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回答（1 个）

Narvik
Narvik 2024-9-2
Hi Konvictus177,
As per my understanding, you would like to create an interactive plot where you can enter x and y coordinates to display the corresponding z-value from a matrix.
You can do this via MATLAB GUI. Refer to the following documentation link for more information on MATLAB GUI:
https://www.mathworks.com/discovery/matlab-gui.html
The following example code demonstrates how to achieve interactive plot with input coordinates using a simple GUI with a heatmap and a text input for coordinates.
function interactiveHeatmap()
% create example data 10x10 data
data = peaks(10);
[xSize, ySize] = size(data);
% create figure and heatmap
hFig = figure('Name', 'Interactive Heatmap', 'NumberTitle', 'off');
hMap = heatmap(data);
title('Interactive Heatmap');
xlabel('X');
ylabel('Y');
% create uicontrols for input
uicontrol('Style', 'text', 'Position', [20 20 100 20], 'String', 'Enter X:');
xInput = uicontrol('Style', 'edit', 'Position', [130 20 50 20]);
uicontrol('Style', 'text', 'Position', [200 20 100 20], 'String', 'Enter Y:');
yInput = uicontrol('Style', 'edit', 'Position', [310 20 50 20]);
% button to update data tip
uicontrol('Style', 'pushbutton', 'Position', [380 20 100 20], ...
'String', 'Show Z', 'Callback', @updateDataTip);
% create a textbox for displaying the z-value
zText = annotation('textbox', [0.15, 0.85, 0.1, 0.1], 'String', '', ...
'FitBoxToText', 'on', 'BackgroundColor', 'white');
% function to update the z value
function updateDataTip(~, ~)
% get input values
x = str2double(get(xInput, 'String'));
y = str2double(get(yInput, 'String'));
% validate input
if isnan(x) || isnan(y) || x < 1 || y < 1 || x > xSize || y > ySize
errordlg('Invalid coordinates', 'Error');
return;
end
% get the z-value
z = data(y, x);
% update the text annotation to display the z-value
set(zText, 'String', sprintf('Z: %.3f', z));
end
end
I hope this helps!

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