check if mouse is on a button

Question

wetlab Technion 2021-5-30

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/843520-check-if-mouse-is-on-a-button

回答： Jan 2021-5-30

I have an app in MATLAB's app designer and I want the mouse shape to change the pointer (using "setfigptr") depending on whether or not the mouse is hovering on a button. so far I used the WindowButtonMotionFcn, running in a loop over all the buttons and comparing the pointer location to each button. however, now that I have more than 30 buttons I am suspecting that this is slowing down the app a bit because the function is called whenever the mouse is moved. is there a different way to do this?

many thanks

nathan

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Jan 2021-5-30

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/843520-check-if-mouse-is-on-a-button#answer_712835

If you post your code, the readers might see a point, which can be improved.

A solution might be to create a 2D matrix with same number of elements as the figure has pixels. Let the values be 0 outside the pixels and n for the n.th button. Then use the CurrentPoint in units pixels as index of this matrix. So you need 1 test to check all buttons.