ginput: How to prompt for value after each click?

Hi,

I'm making a little program that loads a photo then calls ginput so I can click on a number of features. For each feature, I want to enter an estimated value.

Click Prompt: Enter thickness: Enter Value

Click Prompt:

etc

Is there anyway to do this?

Thanks,

Cole

Answer 1

[Image Analyst]

For the thickness prompt, try inputdlg().

To get the points, try getpts() if you have the Image Processing Toolbox. Or just put

[x,y] = ginput(1)

into a while loop where you break out of the while loop if the user clicks the right mouse button. Try this:

clc;
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables. Or clearvars if you want.
workspace;  % Make sure the workspace panel is showing.
fontSize = 24;
imshow('cameraman.tif');
hold on;
maxAllowablePoints = 5; % Whatever you want.
numPointsClicked = 0;

promptMessage = sprintf('Left click up to %d points.\nRight click when done.', maxAllowablePoints);
titleBarCaption = 'Continue?';
button = questdlg(promptMessage, titleBarCaption, 'Continue', 'Cancel', 'Continue');
if strcmpi(button, 'Cancel')
  return;
end

while numPointsClicked < maxAllowablePoints
  numPointsClicked = numPointsClicked + 1;
  [x(numPointsClicked), y(numPointsClicked), button] = ginput(1)  
  plot(x(numPointsClicked), y(numPointsClicked), 'r+', 'MarkerSize', 15);
  if button == 3
    % Exit loop if
    break;
  end
end
% Print to command window
x
y
msgbox('Done collecting points');

Answer 2

[Cole]

Thanks!

I'll give that a try as well.

After posting the question, I thought of one way to do it. I get the length of X from ginput, then in a loop, I plot X(i),Y(i), prompt to enter a thickness for that value then delete that plot marker and move on to the next. Seems to work okay.

[Image Analyst]

There is also a getpts() in the Image Processing Toolbox you may want to take a look at.