Using DrawformattedText to display text

The question asks for the following:

1. The DISPLAY TEXT section should display text in Courier font, with a text-size approximately 1/20th the height of the screen. Don’t just hard-code a number for the text-size; have Matlab compute it (IMPORTANT: The text-size must be a whole-number). The displayed text should include the following, all put on the screen at once:

• The words “RED TOP-LEFT” (with the word “RED” positioned directly above the word “TOP- LEFT”) in red text, centered in the top-left quadrant of the screen.
• The words “GREEN TOP-RIGHT” (with the word “GREEN” positioned directly above the word “TOP-RIGHT”) in green text, centered in the top-right quadrant of the screen.
• The words “BLUE BOTTOM-LEFT” (with the word “BLUE” positioned directly above the word “BOTTOM-LEFT”) in blue text, centered in the bottom-left quadrant of the screen.
• The words “YELLOW BOTTOM-RIGHT” (with the word “YELLOW” positioned directly above the word “BOTTOM-RIGHT”) in yellow text, centered in the bottom-right quadrant of the screen.
• The words “RANDOM GRAY CENTER” (with the words “RANDOM GRAY” positioned directly above the word “CENTER”) in a randomly generated grayscale tone, centered on the screen. This text—and only this text—should be bold.

I have the following code but the red and the green overlay and the blue does not appear on the screen. Im not sure how to fix it.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% SETUP

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

clear all

close all

sca

rng shuffle

Screen ('Preference','VisualDebugLevel',1);

Screen('Preference','SkipSyncTests',1);

mainScreenNum = max(Screen('Screens'));

PsychDebugWindowConfiguration

w = PsychImaging('OpenWindow',mainScreenNum,[100 149 237]);

ListenChar(2)

HideCursor

Screen('BlendFunction',w,'GL_SRC_ALPHA','GL_ONE_MINUS_SRC_ALPHA');

[wWidth,wHeight]=Screen('WindowSize',w);

xmid=round(wWidth/2);

ymid=round(wHeight/2);

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% DISPLAY TEXT

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

Screen ('TextSize',w,wHeight/20);

Screen('TextFont',w,'Courier');

topLeftQuadRect = [0 0 xmid ymid];

topRightQuadRect = [xmid 0 0 ymid];

bottomLeftQuadRect = [0 ymid xmid 0];

bottomRightQuadRect = [xmid ymid 0 0];

DrawFormattedText(w,'RED\nTOP-LEFT','center','center',[255 0 0],[],[],[],[],[],topLeftQuadRect);

DrawFormattedText(w,'GREEN\nTOP-RIGHT','center','center',[0 255 0],[],[],[],[],[],topRightQuadRect);

DrawFormattedText(w,'BLUE\nBOTTOM-LEFT','center','center',[0 0 255],[],[],[],[],[],bottomLeftQuadRect);

Screen('Flip',w);

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% EXIT

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

KbWait;

sca

Answer 1

[Pratheek Punchathody]

As per my understanding PsychToolbox is a third party toolbox. Feel free to contact the owner and the community of the toolbox for further information regarding implementation.