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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