Dynamically changing values displayed on GUI

Question

ANUBHAV SINHA 2012-5-4

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Hi, I am well conversant with making basic MATLAB GUI. However, I want some specialized features as follows: 'As a user slides the slider, I want a bucket to get filled with water'. Hence, if the user slides to 50% of total slider value, the bucket must dynamically change the level of water and show the bucket to be half full.

Any suggestions to accomplish this and integrate such dynamic objects on GUI screen?

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Walter Roberson 2012-5-5

How realistic does the bucket have to look? Like is a plain rectangle good enough? A trapazoid? Does it have to look like a traditional wooden bucket like http://4.bp.blogspot.com/-YciJsaGk2oI/TWsxVFG2leI/AAAAAAAAAEk/3qlIXRAyv3U/s1600/WoodenBucket3DModelZoom.jpg

ANUBHAV SINHA 2012-5-5

@Walter: Bucket= rectangle; Water=blue color. No fancy.

Thanks

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Answer 1

Image Analyst 2012-5-5

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Here's the demo code using patch():

workspace;
fontSize = 20;
% Ask user for a number.
defaultValue = 45;
titleBar = 'Enter a value';
userPrompt = 'Enter the percent full';
caUserInput = inputdlg(userPrompt, userPrompt, 1, {num2str(defaultValue)});
if isempty(caUserInput),return,end; % Bail out if they clicked Cancel.
usersValue = str2num(cell2mat(caUserInput));
% Check for a valid number.
if isempty(usersValue)
    % They didn't enter a number.  
    % They clicked Cancel, or entered a character, symbols, or something else not allowed.
    usersValue = defaultValue;
    message = sprintf('I said it had to be an number.\nI will use %d and continue.', usersValue);
    uiwait(warndlg(message));
end
%======== KEY CODE RIGHT HERE ====================
X = [0 1 1 0];
Y = [0 0 usersValue usersValue];
C = [.3 .5 .8];
patch(X,Y,C)
% Make the plot look nice.
grid on;
ylim([0 100]);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
caption = sprintf('Bucket filled %g%%with water', usersValue);
title(caption, 'FontSize', fontSize);
ylabel('Percent full of water', 'FontSize', fontSize);

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ANUBHAV SINHA 2012-5-8

Thanks a lot!!! It works.

If I intend to put 4 such graphs on the same plot then which part of code should I be changing and what command be using?

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Answer 2

Image Analyst 2012-5-4

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https://ww2.mathworks.cn/matlabcentral/answers/37467-dynamically-changing-values-displayed-on-gui#answer_46796

在 MATLAB Online 中打开

How about you take photos of a bucket with 100 different levels of water. Then you set the slider to go from 0-100. When the user slides the slider, you get the number, and recall the corresponding image and display it?

sliderValue = int32(get(handles.slider, 'Value'));
baseFileName = sprintf(image_%d.PNG', sliderValue);
fullFileName = fullfile(folder, baseFileName);
if exists(fullFileName , 'file')
    imshow(fullFileName);
end

Or else use patch() and do it on a computer graphics simulated bucket.

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ANUBHAV SINHA 2012-5-4

Gr8 to have the popular ImageAnalyst answering my question. I have followed many of your answers/postings from time to time. Thanks for answering.

Ya that idea did strike me but I find it very cumbersome but maybe I have upto 1000 levels to fill the water in the container. So I feel it is tiresome. Can you suggest some automatic technique?

Image Analyst 2012-5-5

To see 1000 levels, at one row of pixels on your monitor, you'd need at least 1000 lines on your monitor. That doesn't leave much space for the rest of your GUI. But anyway, you can use patch. See my demo code in another Answer here.

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