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% MouseTraceDemo3
%
% Allow multiple people to draw simultaneously by use of multiple
% mice or other pointing devices, utilizing Multi-Pointer-X on Linux.
%
% See also: PsychDemos, MouseTraceDemo, GetMouse.
%
% HISTORY
%
% 7/30/11 mk Derived from MouseTraceDemo2.
%
AssertOpenGL;
if ~IsLinux
error('Sorry, this demo currently only works on Linux.');
end
try
% Open up a window on the screen and clear it.
whichScreen = max(Screen('Screens'));
[theWindow,theRect] = Screen('OpenWindow', whichScreen, 0);
% Use an offscreen window as drawing canvas:
woff = Screen('OpenOffscreenWindow', theWindow, 0);
% Get handles for all virtual pointing devices, aka cursors:
mice = GetMouseIndices('masterPointer');
% Move the virtual cursors to the center of the screen
for mouse = mice
theX(mouse+1) = theRect(RectRight)/2;
theY(mouse+1) = theRect(RectBottom)/2;
SetMouse(theX(mouse+1), theY(mouse+1), whichScreen, mouse);
col(mouse+1, 1:3) = rand(1,3) * 255;
% Hide the system-generated cursors. We do this, because only the
% first mouse cursor is hardware-accelerated, ie., a GPU created
% hardware cursor. All other cursors are software-cursors, created
% by the Windowing system. These tend to flicker badly in our use
% case. Therefore we disable all system cursor images and draw our
% cursors ourselves for a more beautiful look:
HideCursor([], mouse);
end
% Some instructions, drawn into the drawing canvas:
Screen(woff,'FillRect',0);
Screen(woff,'TextSize',24);
Screen(woff,'DrawText','Drag mice (i.e. hold button down) to draw. Any key for exit.',50,50,255);
% Wait for release of all keys on all keyboards:
KbReleaseWait(-3);
% Stay in redraw loop as long as no key on any keyboard pressed:
while ~KbCheck(-3)
% Blit offscreen window with users scribbling into onscreen window:
Screen('DrawTexture', theWindow, woff);
% Check all masterpointer mouse/pointing devices:
for mouse = mice
[x(mouse+1), y(mouse+1), buttons] = GetMouse(theWindow, mouse);
if any(buttons(1:3))
% Update offscreen window with latest scribbling from user for this 'mouse':
if (x(mouse+1) ~= theX(mouse+1) || y(mouse+1) ~= theY(mouse+1))
Screen('DrawDots', woff, [x(mouse+1), y(mouse+1)], 10, col(mouse+1, :));
theX(mouse+1) = x(mouse+1); theY(mouse+1) = y(mouse+1);
end
end
% Draw a dot to visualize the mouse cursor for this 'mouse:
Screen('DrawDots', theWindow, [x(mouse+1), y(mouse+1)], 5, col(mouse+1, :));
end
% Flip the updated onscreen window:
Screen('Flip', theWindow);
end
% Show master cursors again:
for mouse = mice
ShowCursor('Arrow', [], mouse);
end
sca;
catch
sca;
psychrethrow(psychlasterror);
end %try..catch..
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