How can I add a vertical line on an image plotted on an axes on MATLAB GUI

Hi, I am making a GUI that can browse image from directory and load it on an axes (and the user can rotate the image). I need to add a vertical line at the center of the image (preferably using button). But I am really lost here as I am new at MATLAB. So far, I can only make a GUI that can browse image and show it on an axes, and user can already rotate it using slider. Please tell me what to do to add the line using button. (Btw, I was trying to put my code here but it came out messy, anyone knows why?) Thanks a lot

Answer 1

[Image Analyst]

For formatting tutorial, read this: http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup Basically paste, highlight, then click {}Code.

To draw a line on your image:

hold on;
[rows, columns, numberOfColorChannels] = size(yourImage);
midColumn = columns/2;
line([midColumn, midColumn], [1, rows], 'Color', [.8, .7, 0.1]);

You can change the color and location if you want.

[Haidar]

thanks it works! do you know how to make the line moveable (to the right or left)?

[Image Analyst]

You can use imline() instead of line() to let the user click and drag it.

[Haidar]

You're a hero! Another question if you dont mind, is the line burned into the image or only an overlay? and how to burn it to the image?

[Image Analyst]

After the user double clicks the line to accept it, you have to decide if you want to draw a line into the overlay or burn it into the image. I attach a demo that goes over all that. If I've answered all your questions, can you mark the answer as "Accepted"?

[Haidar]

thanks! and done!