draw_blankstimulus.js

    //Function to draw blankstimulus


    export function draw_blankstimulus(canvasID) 
    {
    var stimCanvas = document.getElementById(canvasID);
    var stimContext = stimCanvas.getContext("2d");


    //create black stimulus box
    var squareWidth = 250;
    var sqystartpoint= (stimCanvas.height - squareWidth)/2;
    var sqxstartpoint= (stimCanvas.width - squareWidth)/2;

    function createbox() {
    stimContext.fillStyle = "#000000 "; // grey inner square#C0C0C0
    stimContext.fillRect(sqxstartpoint,  sqystartpoint, squareWidth, squareWidth);// Fill black square (stimulus background)
    }
    createbox();
        

    //specification 	
        var cellSize = 10;


    var string4stimulus = stimCanvas.toDataURL();
    stimContext.clearRect(0, 0, stimCanvas.width, stimCanvas.height);

    return string4stimulus;
    }