i have found this code over internet.But i need its output coordinates in x and y variables. How i can do that ?

Question

Haroon Younas 2016-4-28

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https://ww2.mathworks.cn/matlabcentral/answers/281400-i-have-found-this-code-over-internet-but-i-need-its-output-coordinates-in-x-and-y-variables-how-i-c

编辑： Stephen23 2016-4-29

function [ x1,y1,x2,y2 ] = image_Coordinates
clc;clear;
imObj = imread('Finalized_Lhr_maps_Half.jpg');
figure;
hAxes = axes();
imageHandle = imshow(imObj);
set(imageHandle,'ButtonDownFcn',@ImageClickCallback);
function ImageClickCallback ( objectHandle , eventData )
axesHandle  = get(objectHandle,'Parent');
coordinates = get(axesHandle,'CurrentPoint'); 
coordinates = coordinates(1,1:2)
message     = sprintf('x: %.1f , y: %.1f',coordinates (1) ,coordinates (2));
helpdlg(message);
end
% ah = get( imageHandle, 'Parent' );
% p = get( ah, 'CurrentPoint' )
end

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Answer 1

Walter Roberson 2016-4-28

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在 MATLAB Online 中打开

[x(1), y(1), x(2), y(2)] = image_Coordinates();

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Haroon Younas 2016-4-29

Screenshot (201).png

it is giving this error again and again. Am i doing it wrong ?

Stephen23 2016-4-29

编辑：Stephen23 2016-4-29

在 MATLAB Online 中打开

You need to allocate values to x1,y1,x2,y2 inside the function. MATLAB does not just invent some values for these: if you do not define inside the function what value x1 has, then what value do you expect the x1 output variable to have?

function out = myFun()
out = 4; % define the output variable
end

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Answer 2

Image Analyst 2016-4-29

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I suggest you just learn how to use impixelinfo(). It's better because it gives you a "live" readout as you move the cursor over the image. No clicking even needed at all.

If you need to get the values into variables for use in your code, then I suggest you have a mode where the user does that, like a button where the button callback calls ginput(1). But if it's just for visual inspection, then I recommend impixelinfo().