The setup() function runs when the program starts. It is used to set the initial environment properties such as text-color, screen size, background-color and load the media file such as images and fonts. The program contains only one setup() function. The setup() function can not be called again after its initial execution.
Note: The variable declaration within setup() function can not be access by other functions including draw() function.
Syntax:
setup()
Below examples illustrate the setup() function in p5.js:
Example 1:
function setup() {           // Create Canvas of given size     createCanvas(400, 300);   }   function draw() {           background(220);           // Use color() function     let c = color('green');       // Use fill() function to fill color     fill(c);           // Draw a rectangle     rect(50, 50, 300, 200);       } |
Output:
Example 2:
function setup() {            // Create Canvas of given size     var cvs = createCanvas(600, 250); }    function draw() {          // Set the background color     background('green');          // Use createDiv() function to     // create a div element     var myDiv = createDiv('neveropen');          var myDiv1 = createDiv('A computer science portal for neveropen');          // Use child() function     myDiv.child(myDiv1);          // Set the position of div element     myDiv.position(150, 100);           myDiv.style('text-align', 'center');          // Set the font-size of text     myDiv.style('font-size', '24px');          // Set the font color     myDiv.style('color', 'white');    } |
Output:
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