Can Matlab determine cursor position continuously?
3 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
I have an image plot that was created with "imagesc", and I can use ginput to select (x,y) points on the image, then I can read the value of that particular pixel which I output to a figure that accompanies the image.
What I would like to do is have the (x,y) point and pixel value output continuously as I "mouse over" the image, without clicking. Can this be done?
0 commentaires
Réponse acceptée
Jan
le 13 Juil 2011
The WindowButtonMotionFcn can help:
FigH = figure('WindowButtonMotionFcn', @MotionFcn)
function MotionFcn(FigH, EventData)
get(FigH, 'CurrentPoint')
get(get(FigH, 'CurrentAxes'), 'CurrentPoint')
Now the current point is written to the command window, if the mouse if moved over the figure.
5 commentaires
Jim Hokanson
le 24 Oct 2017
New link for Walter's link above: https://www.mathworks.com/help/matlab/ref/matlab.ui.figure-properties.html
Plus de réponses (2)
Walter Roberson
le 13 Juil 2011
No, it is not possible to have the cursor position updated continuously. PS/2 and USB mice and serial mice only send coordinate updates periodically, not continuously. (Old joysticks, on the other hand, used to have analog position signals; with those and an analog to digital convertor, you could update the position as fast as the convertor could run.)
2 commentaires
Jan
le 13 Juil 2011
@Walter: I think the frequency of updates of the pixel position is limited by the runtime of the Matlab function for evaluating. For a fast movement the mouse position will not be displayed for all pixels.
Anyhow, I assume that "without clicking" is more important for the OP than a real continuity.
Walter Roberson
le 13 Juil 2011
Mice do not report for every pixel! USB mice, by default, poll at a maximum of 125 Hz; see http://www.nextlevelgamer.com/tweaks/optimizing-your-usb-mouse-polling-rate
I have seen reports that PS/2 mice max out at 125 Hz but are often appreciably slower.
Voir également
Catégories
En savoir plus sur Annotations dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!