standardGauge

class rail {

  constructor(pace) {

    this.pace = pace;

    this.railWidth = this.pace * 0.1548;

    this.trkWidth = this.pace * 3.074;

    this.tieLength = this.trkWidth * 1.72;

    this.tieWidth = this.tieLength * 0.1;

    this.offset = (this.tieLength-this.trkWidth)/2;

  }

  display(x,y, units) {

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

      // ties/sleepers

      fill(127); noStroke();

      rect(x + i * this.pace, y-this.offset, this.tieWidth, this.tieLength);

      // rails

      stroke(255);

      strokeWeight(this.railWidth);

      line(x + i * this.pace, y, x + i * this.pace + this.pace, y);

      line(x + i * this.pace, y + this.trkWidth, x + i * this.pace + this.pace, y + this.trkWidth);

    }

  }

}

​

let track = new rail(33);

​

function setup() {

  createCanvas(windowWidth,windowHeight);

  pixelDensity(2);

}

​

function draw() {

  background(0);

  if(mouseY>100) {

    track = new rail(round(mouseY/20));

    track.display(30,50, round(mouseX/33)); // x,y, units

    track = undefined;

  }

}