Rotating text to 90 degrees

I want to design an experiment in Psychtoolbox in which the alphabet T is rotated to 90 degrees.

By rotated to 90 degrees, I mean that the alphabet T (vertical) should appear in such a way that the head of the T should be either in the left or right direction.

Here is the code that I made so far but I do not know how to proceed.

% Initialize Psychtoolbox
PsychDefaultSetup(2);
Screen('Preference', 'SkipSyncTests', 1); % Skip sync tests for better compatibility
% Get the screen number
screenNumber = max(Screen('Screens'));
% Open a window
[windowPtr, windowRect] = PsychImaging('OpenWindow', screenNumber, 0); % 0 is black background
% Set text parameters
textSize = 50;
textColor = [255 255 255]; % White color
fontName = 'Arial';
% Define the alphabet 'T'
alphabetT = 'T';

Answer 1

[Star Strider]

I’ve never used PsychToolbox, however that would be relatively straightforward in MATLAB graphics —

alphabetT = 'T';

figure
text(0.5, 0.5, alphabetT, 'FontSize',50)
set(gca, 'Visible','off')

figure
text(0.5, 0.5, alphabetT, 'FontSize',50, 'Rotation',90)
set(gca, 'Visible','off')

It might be necessaary to add an axes reference to the text call. See the documentation reference in ax for details.

EDIT — Corrected typographical errors.

.

Answer 2

[Adam Danz]

It looks like you're working with embedded text.

You may find this resource helpful: https://peterscarfe.com/rotatingText.html

It contains a demo for rotating text in psychtoolbox by drawing the text to a texture and then to the screen.

Answer 3

[Jérémie]

Hi there, in the same way, I would like to know whether there is a simple way to do so while working with Cogent buffers? For a bit of context, I am currently plotting arrays of letters (4 rows of 6 coloumns). Here are extracts of my code.

SurrLett = 'COJURQGBDPS';
IndLett = 'XXXXXXXXXXX';
allXpos = [-411.4 -246.9 -82.3 82.3 246.9 411.4];
allYpos = [-259.2 -86.4 86.4 259.2];

----

for i = 1:4                                                                 % 4 rows
        rng('shuffle');
        rrRes = randperm(length(SurrLett));                                 % Randomize letters of other lines
        currLineLett = SurrLett(rrRes(1:6));                                % Pick random letters for other lines
        
        % Place letters at corresponding positions with random colours
        for xp = 1:length(allXpos)
            v = randi(size(AllColours, 1));                                 % AllColours is a list of 19x3 elements (19 RGB codes)
            randomColour = AllColours(v, :);
            if i == indexToRemove                                           % Checking for a random line (because indexToRemove = randi([1, 4], 1))
                setforecolour(1, 1, 1);
                preparestring(cuedLineLett(xp), 2, allXpos(xp), allYpos(3));
            else
                setforecolour(randomColour(1), randomColour(2), randomColour(3))
                preparestring(currLineLett(xp), 2, allXpos(xp), allYpos(i));
            end
        end
    end

Thanks for you help in this matter. Feel free to ask for details whether it is unclear :)

Edit: Even tho I am looking for a random line, I am forcing to plot on allYpos(3), but it does not really matter for me by the end. Like I just need to screenshot the matrix where the white line is on this allYpos(3) location. Otherwise it would have been randomized as well.

[Jérémie]

The letters can be turned thanks to the

cgfont(Font, Size, Rotation);

function.