bugGNU Octave - Bugs: bug #65835, [Feature Request] qt figure...


bug #65835: [Feature Request] qt figure created by imshow or imagesc to show value at mouse cursor in status bar next to coordinates

Submitter:  Jan Hieronymus <xyhausen>
Submitted:  Tue 04 Jun 2024 07:17:47 PM UTC
Category:  Plotting with OpenGL Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Feature Request
Status:  None Assigned to:  None
Originator Name:  Open/Closed:  * Open
Release:  * 9.1.0 Operating System:  * Any
Fixed Release:  None Planned Release:  None
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Tue 04 Jun 2024 07:17:47 PM UTC, original submission:  

When displaying an image with the qt graphical toolkit, the coordinates of the mouse pointer are displayed in the status bar in the bottom left corner of the window as a string with the format "(%1, %2)".

It would be very much appreciated (also by others, e.g. https://stackoverflow.com/questions/23706937/displaying-pixel-values-of-an-image-in-octave#32973209), if the data value under the mouse pointer would also be displayed in the status bar, e.g. with the format "(%1, %2): %3" (or something that resembles the Matlab behaviour).

It appears, the function "Figure::updateStatusBar" (in file "libgui/graphics/Figure.cc") is called from "Canvas::canvasMouseMoveEvent" (in file "libgui/graphics/Canvas.cc") to update the status bar of the figure window.
Unfortunately, I could not figure out, how to access the image data matrix of the figure to grab the pixel value, otherwise, I would have suggested a patch.

Jan Hieronymus <xyhausen>


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