p5.js setup() Function

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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('zambiatek'); 
     
    var myDiv1 = createDiv('A computer science portal for zambiatek'); 
     
    // 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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