% rectangle is a different size than the source rectangle, the % destination you are copying too on the screen. % texture you are copying from and the destinationRect specifies the The variable sourceRect specifies the part of the % corners of the image, just like the location parameter to FrameOval % Each of these is a vector containing four numbers that specify the % and destinationRect, which you can read about in the documentation. % You will need to use the parameters of DrawTexture named sourceRect % which you can get from the imagedata variable before its cleared. % resize the image, you will need to know its original dimensions % three different locations and at three different sizes. % image at different locations on the screen simultaneously at
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% Modify the code of 13.7.1 to place three copies of the same % The DrawTexture operation can place a texture multiple times. Solution_13_18_1 %Run each of the problem functions in turn. % Screen('Preference', 'SkipSyncTests', 1) % If you need to! % functions so the Problem 13 file must itself be a function % examples by downloading and opening the file PsychtoolboxSolutionsFiles.zipįunction main % Problems in this chapter will have nested or local
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% You can download a folder with this and two other files needed to run the The best way to explore Psychtoolbox is to run % web page cannot show the Command window or Graphic output for the % Because the program's interaction with the user is very dynamic, the % problem in a file or paste it into the Command window. % To generate the solution for one problem, copy and run the code for that % Solutions for selected problems from MATLAB for Behavioral Scientists, Save(outfilename,'ttype') Output 13.15.1: Code 13.16.1: help PsychDemos Code 13.16.2: edit DriftDemo Ttype(typenum).error = ttype(typenum).error + 1 If(response(1)='a') %convert the response into L or R ThisRT = secs-Starttime %compute the reaction time Nowtime = GetSecs % check the current time
While(Nowtime < Starttime + timeout & responseGiven = 0) Starttime = Screen('Flip',window,onsetTime1 + 1.0. Screen('DrawText', window, ttype(typenum).stim. %Show the stimulus on the left or right side Screen('DrawText', window, '+',centerX-fixSizeX. WaitSecs(2) %pause at start of trial, then show fixation % Prepare data fields for each type of trial. Sinit = input('Subject''s initials: ','s') Screen('Preference', 'VisualDebugLevel', 1) Sca Code 13.14.2: AlphaImageDemo Code 13.15.1: % Part One: Initialization
Screen('Blendfunction', window, GL_SRC_ALPHA. Sprintf('The correct answer was %d',uniformdirection)Įnd Output 13.13.1: Code 13.14.1: Screen('Preference', 'VisualDebugLevel', 1) Response = input('Which direction did most of the dots move?\n 1= down, 2 = left, 3 = up, 4 = right: ') Timestamps(counter) = Screen('Flip',window) Screen('Drawdots',window,dotpos,2,[centerX.
HalfFlip = Screen('GetFlipInterval', window)/2 Sca Output 13.7.1: Code 13.8.1: Screen('Preference', 'VisualDebugLevel', 1) Screen('DrawTexture', window, TexturePointer) TexturePointer = Screen('MakeTexture', window, imagedata) Sca Output 13.6.1: Code 13.7.1: imagedata = imread('lab_photo.jpg') Sca Code 13.6.1: Screen('Preference', 'VisualDebugLevel', 1) Sca Code 13.5.2: window = Screen('OpenWindow',0,) Code 13.5.1: Screen('Preference', 'VisualDebugLevel', 1) Chinese).A standard MATLAB/Octave character text string is interpreted according to Screen's current character encoding setting "text" may include Unicode characters (e.g. =Screen('DrawText', windowPtr, text ) ĭraw text. Sca Output 13.3.1: Hello World! Code 13.4.1: help Screen Code 13.4.2: Screen DrawText? Output 13.4.2: Usage: Code 13.3.1: mywindow = Screen('OpenWindow',0) PTB-INFO: Type 'PsychtoolboxVersion' for more detailed version information. PTB-INFO: This is Psychtoolbox-3 for Apple OS X, under Matlab 64-Bit (Version 3.0.11 - Build date: Jul 23 2013). Code and Output Code 13.2.1: format long
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