MATLAB: Does the WindowButtonMotionFcn callback get called more frequently with a Logitech Gaming Mouse

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Why does my WindowButtonMotionFcn callback get called more frequently with a Gaming Mouse?

I have a programmatic user interface in a figure window. I have a callback set for 'WindowButtonMotionFcn' which performs some operations every time the mouse moves.

When I use my laptop trackpad or a generic mouse, the interface works as expected.

When I use my high end gaming mouse, the interface lags heavily and is delayed in responding.

Best Answer

Some gaming mouses have an exceptionally high _report rate_ which can lead to a dramatic increase in the number of mouse movement events as compared to a generic mouse.

A mouse _report rate_ is the rate at which the mouse updates the PC on changes in the mouse position. A higher report rate generally means that the 'WindowButtonMotionFcn' callback will be triggered more often. If this callback performs some nontrivial work, the extra callback triggers can lead to an unresponsive or lagging user interface.

Some gaming mice include special vendor software that allows the user to change the report-rate. If possible for your mouse, turn down the report rate to resolve the issue.

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MATLAB: How to trigger ButtonDownFcn callback for an object with visible off in MATLAB R2014b

Starting in MATLAB R2014b, graphics objects have a new PickableParts property that controls if the object can capture mouse clicks. By default, the PickableParts property is set to 'visible' so the object can capture mouse clicks when the Visible property is set to 'on'. If you want an invisible object to capture mouse clicks, then set the PickableParts property to 'all'.

For example, create a marker and set the ButtonDownFcn callback so that clicking the marker displays 'hit' at the command line.

m = line(5,5,'Marker','o','MarkerSize',20,'ButtonDownFcn','disp hit');

Set the Visible property of the marker to 'off' to make it invisible.

m.Visible = 'off';
axis([4 6 4 6])

Clicking over the position of the invisible marker does not trigger the ButtonDownFcn callback because invisible objects do not capture clicks by default. Enable the invisible marker to capture clicks by setting the PickableParts property to 'all'.

m.PickableParts = 'all';

Note: When an object captures a mouse click, the HitTest property controls if the object responds to the click or if it passes the click to an ancestor. By default, the object responds. Set the HitTest to 'off' if you want an ancestor to respond, such as the parent axes.

MATLAB: How to obtain the coordinates of the mouse on the screen displayed somewhere in the figure window

This enhancement has been incorporated in MATLAB 7.5 (R2007b).

As a workaround in previous MATLAB releases, you can use the following MATLAB function to track mouse motion:

function mousetrk
%MOUSETRK function to track mouse motion
% This function creates two static text controls
% which contain the x & y coordinates of the mouse
% The driving callback is executed by the
% WindowButtonMotionFcn of the figure.
figure
axes('Visible','off')
xbox = uicontrol('Style','text','Tag','xbox');
xboxlabel = uicontrol('Style','text','String','X Value',...
    'Position',get(xbox,'position')+[0 21 0 0]);
ybox = uicontrol('Style','text','Position',[90 20 60 20],'Tag','ybox');
yboxlabel = uicontrol('Style','text','String','Y Value',...
    'Position',get(ybox,'position')+[0 21 0 0]);
callback = ['pt = get(gca,''CurrentPoint'');'...
  'xbox = findobj(''Tag'',''xbox'');' ...
  'ybox = findobj(''Tag'',''ybox'');' ...
  'set(xbox,''String'',num2str(pt(1,1)));' ...
  'set(ybox,''String'',num2str(pt(1,2)));'];
set(gcf,'WindowButtonMotionFcn',callback);

For more information on the WindowButton functions, please refer to the Handle Graphics Property Browser:

https://www.mathworks.com/help/releases/R2009b/techdoc/infotool/hgprop/doc_frame.html

Best Answer

Related Solutions

MATLAB: How to trigger ButtonDownFcn callback for an object with visible off in MATLAB R2014b

MATLAB: How to obtain the coordinates of the mouse on the screen displayed somewhere in the figure window

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