* Sketch: DPMHelix_001

 * Parent Sketch: none

 * Type: dynamic

 *

 * Summary : Repeating vertical lines

 *

 * GIT:

 * Author: Ferdinand Sorg

 * https://openrndr.org/

 * https://dpmanual.bitbucket.io

 * https://designingprograms.bitbucket.io

 */

​

let sw = 1;

let isInteractive = false;

​

function setup() {

createCanvas(500, 500);

  noFill();

  stroke(255);

}

​

function draw() {

    background(0);   

    strokeWeight(sw);

    let num = map(mouseY, 0, height, 1, 150);

    drawForm(width/2, height/2, num);

}

​

​

/////////////////////////// FUNCTIONS ////////////////////////////

function drawForm( _x,  _y,  _num) {

    push();

    translate(_x, _y);

    let angle = 0;

    for (let i = 0; i< _num; i++) {

      let orbitX = 50;

      let orbitY = 10;

      let y = map(i, 0.0, _num, -((height/2.0)-orbitY), (height/2.0) - orbitY);

      let delay = map(i, 0.0, _num, -1.0, 1.0);

      if (isInteractive) {

        angle = map(mouseX, 0.0, width, -1.0, 1.0);

      } else {

        angle = frameCount*0.015;

      }

      let x1 = sin(delay + angle) * orbitX;

      let y1 = y + (cos(delay + angle)) * orbitY;

      let x2 = sin(delay + angle) * (-orbitX);

      let y2 = y + (cos(delay + angle)) * (-orbitY);

      line(x1, y1, x2, y2);

    }

    pop();

  }

  function keyPressed() {

    if (key == 's') {

      saveFrame("savedImage_###.png");

    }

    if (key == '+') sw++;

    if (key == '-') {

      if (sw>0)

        sw--;

    }

    if (key =='i') {

      isInteractive = !isInteractive;

    }

  }