/usr/share/psychtoolbox-3/PsychDemos/MouseTraceDemo2.m is in psychtoolbox-3-common 3.0.14.20170103+git6-g605ff5c.dfsg1-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 | % MouseTraceDemo2
%
% ___________________________________________________________________
%
% Draw a curve with the mouse. Same as MouseTraceDemo, but asks
% Screen('Flip') to not clear the framebuffer after flip. This way,
% we don't need to redraw the whole mousetrace in each frame.
% _________________________________________________________________________
%
% See also: PsychDemos, MouseTraceDemo, GetMouse.
%
% HISTORY
%
% 4/23/05 mk Derived from MouseTraceDemoOSX: Uses new "Don't clear" mode of Flip.
% to avoid redrawing the whole past mousetrace after each
% Flip --> Faster.
try
% Open up a window on the screen and clear it.
whichScreen = max(Screen('Screens'));
[theWindow,theRect] = Screen(whichScreen,'OpenWindow',0);
% Move the cursor to the center of the screen
theX = round(theRect(RectRight) / 2);
theY = round(theRect(RectBottom) / 2);
SetMouse(theX,theY,whichScreen);
% Wait for a click and hide the cursor
Screen(theWindow,'FillRect',0);
Screen(theWindow,'TextSize',24);
Screen(theWindow,'DrawText','Drag mouse (i.e. hold button down) to draw',50,50,255);
Screen('Flip', theWindow);
while (1)
[x,y,buttons] = GetMouse(theWindow);
if buttons(1)
break;
end
end
Screen(theWindow,'DrawText','Release button to finish',50,50,255);
HideCursor;
% Loop and track the mouse, drawing the contour
[theX,theY] = GetMouse(theWindow);
thePoints = [theX theY];
Screen(theWindow,'DrawLine',255,theX,theY,theX,theY);
% Set the 'dontclear' flag of Flip to 1 to prevent erasing the
% frame-buffer:
Screen('Flip', theWindow, 0, 1);
while (1)
[x,y,buttons] = GetMouse(theWindow);
if ~buttons(1)
break;
end
if (x ~= theX || y ~= theY)
thePoints = [thePoints ; x y]; %#ok<AGROW>
[numPoints, two]=size(thePoints);
% Only draw the most recent line segment: This is possible,
% because...
Screen(theWindow,'DrawLine',128,thePoints(numPoints-1,1),thePoints(numPoints-1,2),thePoints(numPoints,1),thePoints(numPoints,2));
% ...we ask Flip to not clear the framebuffer after flipping:
Screen('Flip', theWindow, 0, 1);
theX = x; theY = y;
end
end
% Close up
Screen(theWindow,'DrawText','Click mouse to finish',50,50,255);
ShowCursor;
Screen(theWindow,'Close');
% Plot the contour in a Matlab figure
plot(thePoints(:,1),theRect(RectBottom)-thePoints(:,2));
catch
Screen('CloseAll')
ShowCursor;
psychrethrow(psychlasterror);
end %try..catch..
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