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HTML

              
                <script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.3.1/p5.min.js"></script>
              
            
!

CSS

              
                body {
  margin: 0;
  overflow: hidden;
}

              
            
!

JS

              
                function setup() {
  createCanvas(windowWidth, windowHeight)
  background('#fbf8f3')
}

function draw() {
  if (mouseIsPressed === true) {
    sprayPaint()
  }
}

// prevents touch gestures on touch screens from dragging the page around 
function touchMoved() {
  return false
}

function sprayPaint() {
	// set the color and brush style
  stroke(0, 0, 0, 255)
  strokeWeight(1)

	// find the speed of the mouse movement
  const speed = abs(mouseX - pmouseX) + abs(mouseY - pmouseY)

	// set minimum radius and spray density of spraypaint brush
	const minRadius = 10;
	const sprayDensity = 80
  
  // find radius of the spray paint brush and radius squared
  const r = speed + minRadius;
  const rSquared = r * r;

	// set the number of times we lerp the points in the for loop
	const lerps = 10

  // repeat the random points with lerping
  for (let i = 0; i < lerps; i++) {
    
    // find the lerped X and Y coordinates
    const lerpX = lerp(mouseX, pmouseX, i / lerps)
    const lerpY = lerp(mouseY, pmouseY, i / lerps)
    
    // draw a bunch of random points within a circle
    for (let j = 0; j < sprayDensity; j++) {

      // pick a random position within the circle
      const randX = random(-r, r)
      const randY = random(-1, 1) * sqrt(rSquared - randX * randX)

      // draw the random point
      point(lerpX + randX, lerpY + randY)
    }
  }
}
              
            
!
999px

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