The noLoop() function is used to stop the program after executing the draw() function. The loop() function runs the draw() function again and again. If noLoop() function is used in setup() function then it should be the last line inside the block. If noLoop() function is used then it is not possible to change or access the screen inside event handling functions such as mousePressed() or keyPressed().
Syntax:
noLoop()
Below examples illustrate the noLoop() function in p5.js:
Example 1:
function setup() {       // Create canvas of given size   createCanvas(500, 300);       // Set the background color   background('green');       // Use noLoop() function   noLoop(); }   function draw() {       // Set the stroke color   stroke('white');       // Set the stroke width   strokeWeight(4);       // Function to draw the line   line(50, 50, 450, 250);     } |
Output:
Example 2:
let l = 0;   function setup() {       // Create canvas of given size   createCanvas(500, 300);       // Set the background color   background('green');   }   function draw() {       // Set the stroke color   stroke('white');       l = l + 0.5;   if (l > width) {     l = 0;   }       // Function to draw the line   line(l, 0, l, height);     }   function mousePressed() {   noLoop(); }   function mouseReleased() {   loop(); } |
Output:
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