let helixRadius = 100;

let helixHeight = 500;  // Increased height for a longer helix

let numStrands = 2;

let numRungs = 15;  // More rungs for a longer helix

​

function setup() {

  createCanvas(800, 800, WEBGL);

}

​

function draw() {

  background(255, 213, 182);

  // Set the stroke weight for thicker strands

  strokeWeight(4);  // Adjust this value to make the strands thicker

​

  // Rotate the entire scene around the Y-axis for a 360-degree rotation effect

  rotateY(angle);  // This makes the helix rotate left to right

​

  // Draw the DNA helix

  for (let i = 0; i < numRungs; i++) {

    let t = map(i, 0, numRungs - 1, 0, TWO_PI);

​

    // Create positions for the left and right strands (on the Z-axis)

    let x1 = helixRadius * cos(t);

    let y1 = map(i, 0, numRungs - 1, -helixHeight / 2, helixHeight / 2);  // Keep the helix vertical

    let z1 = helixRadius * sin(t);

​

    let x2 = helixRadius * cos(t + PI); // Second strand offset by PI (opposite direction)

    let y2 = y1;

    let z2 = helixRadius * sin(t + PI);

​

    // Draw the strands (lines between the two strands)

    if (i < numRungs - 1) {

      let nextT = map(i + 1, 0, numRungs - 1, 0, TWO_PI);

      let nextX1 = helixRadius * cos(nextT);

      let nextY1 = map(i + 1, 0, numRungs - 1, -helixHeight / 2, helixHeight / 2);

      let nextZ1 = helixRadius * sin(nextT);

​

      let nextX2 = helixRadius * cos(nextT + PI);

      let nextY2 = nextY1;

      let nextZ2 = helixRadius * sin(nextT + PI);

​

      // Draw the strands connecting consecutive points

      line(x1, y1, z1, nextX1, nextY1, nextZ1);

      line(x2, y2, z2, nextX2, nextY2, nextZ2);

      // Draw the "ladders" (connecting rungs between the two strands)

      line(x1, y1, z1, x2, y2, z2); // Rung between the two strands

    }

  }

​

  // Increase the angle to rotate 360 degrees over time

  angle += 0.02;  // Adjust this value for the speed of rotation

  if (angle > TWO_PI) {

    angle = 0;  // Reset angle to loop through 360 degrees

  }

}

​