How can I display a figure in the entrire screen of a second monitor without toolbars/w​hitespace/​greyspace around it?

I am trying to project various different sine waves onto a scene using a projector in order to obtain depth information. My current method involves a projector currently acting as my second monitor connected through display port. I'm then trying to fit a figure of the sinewaves to the monitor such that there is nothing around the edges, just the sinewave pattern. The code I have been trying is this:

 time = 1:0.001:2;
frequency = 60;
phase = 90;   
phase_in_rad = degtorad(phase); %Ignore these for the time being
y=0.5*cos((2*pi*frequency*time)+(2*pi/3));
plot(time,y);
print('SineWaveImage','-djpeg');

fig1 = figure;
imshow(imread('SineWaveImage.jpg'));
pos_fig1 = [0 0 1900 2000];
set(fig1,'Position',pos_fig1,'ToolBar','none','MenuBar','none')

I have been attempting to change pos_fig1 so that the projector projects only the sinewaves and no grey/white space. I've also tried a function that cuts a lot of the white space successfully, but still suffers from the grey space when it is put back into a figure.

Is there a better way of writing this code, or any other methods of achieving this? Thanks for any help

Answer 1

[Karan Singh]

Hi @Max Everest,

You can avoid "print" and "imread" which introducees extra image border. Try using "MonitorPositions" to detect the 2nd monitor and " WindowState = 'fullscreen' " to make the figure cover the intrie projector. Further you can set off the axis lable and resize the figure. Here is my code

time = linspace(0, 2, 2000);
frequency = 60;
phase = 90;
phase_in_rad = deg2rad(phase);
y = 0.5 * cos((2 * pi * frequency * time) + (2 * pi / 3));

fig1 = figure('ToolBar', 'none', 'MenuBar', 'none', 'Color', 'black');

% Move figure to projector screen (modify position based on setup)
monitorPositions = get(0, 'MonitorPositions');
projectorPos = monitorPositions(end, :);
set(fig1, 'Position', projectorPos, 'WindowState', 'fullscreen');

ax = axes(fig1, 'Position', [0 0 1 1], 'XColor', 'none', 'YColor', 'none', 'Color', 'black');
plot(time, y, 'w', 'LineWidth', 2); % White sine wave on black background
axis off; % Remove axis labels and borders
xlim([min(time) max(time)]);
ylim([-1 1]);

% Refresh figure to remove unwanted white space
drawnow;

You can check and see if this resolves the issue.

Karan