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HTML

              
                <title>City Generator Test</title>
<canvas id="myCanvas" width="1000" height="1000"></canvas>
<!-- <form>
  <button id="regenerate"> Regenerate </button>
</form> -->
              
            
!

CSS

              
                html{
  margin: 0px;
  padding: 0px;
  font-family: 'Lato', sans-serif;
  oveflow: hidden;
}
body {
  margin: 0px;
  padding: 0px;
  overflow: hidden;
}
canvas{
  margin: 0px;
  padding: 0px;
  border:1px solid black;
}
              
            
!

JS

              
                const canvas = document.getElementById('myCanvas');
const ctx = canvas.getContext('2d');

var roads = [];
var bldgs = [];

function road(x,y,x2,y2,width,length) {
  this.x = x;
  this.y = y;
  this.x2 = x2;
  this.y2 = y2;
  this.width = width;
  this.length = length;
}

function bldg(x, y, eccen, size) {
    this.x = x; // 0 -> Width 
    this.y = y; // 0 -> Height
    this.eccen = eccen; //Eccentricity, how close to a perfect square the building is.
    this.size = size; //How wide the base of the building is, height is determined by content.
};
//------------Road Builder----------------
var x1,y1,x2,y2;
var secondPoint = false;
var roadsPath = new Path2D;

function addRoad(){
  console.log("Here!");
  if (!secondPoint){
    x1 = event.clientX;
    y1 = event.clientY;
    secondPoint = true;
  } else if(secondPoint) {
    x2 = event.clientX;
    y2 = event.clientY;
    roadsPath.moveTo(x1,y1);
    roadsPath.lineTo(x2,y2);
    secondPoint = false;
    
    if (distanceFromPointToLine(0,0,x1,y1,x2,y2,100)) {
      ctx.strokeStyle = 'green';
    } else {
      ctx.strokeStyle = 'red';
    }
    ctx.stroke(roadsPath);
    //showMap();
  }
};
//------------Building Builder------------

//----------------------INIT----------------------
function init() {
  canvas.width = window.innerWidth;
  canvas.height = window.innerHeight;
  //Generate Layout
  
  showMap();
};
//----------------------DRAW----------------------
function showMap(){//Draws each frame
  //ctx.clearRect(0, 0, canvas.width, canvas.height); // clear canvas
  
  // var bldg61 = new Path2D;
  // bldg61.moveTo(10,10);
  // bldg61.lineTo(20,20);
  // bldg61.lineTo(30,50);
  // bldg61.lineTo(10,40);
  // bldg61.closePath();
  
  ctx.strokeStyle = 'green';
  ctx.stroke(roadsPath);
};

function boundingBoxOfLine(x1, y1, x2, y2){
  //get rectangle with spacing around line
};

function placeBuildingsAroundLine(){
  // for (var i=0; i< 50 ; i++){
  //   var rx = Math.random
  // }
};

function getRandomInt(min, max) {
  var diff = max - min;
  return Math.floor(Math.random() * Math.floor(diff));
};

function formulaOfLine(x1, y1, x2, y2) { //Coordinates of points of a line
  var a = y2 - y1;
  var b = x1 - x2;
  var c = (a * x1) + (b * y1);
  c = -c;
  var pieces = [a, b, c];
  return pieces;
};

function distanceFromPointToLine(px, py, x1, y1, x2, y2, max, min = 0){
  var eq = formulaOfLine(x1,y1,x2,y2);
  var dToLine = (Math.abs((eq[0]*px) + (eq[1]*py) + (eq[2]))/Math.hypot(eq[0],eq[1]));
  if (dToLine < max && dToLine > min) {
    return true;
  }else {
    return false; 
  }
};
canvas.addEventListener('click', addRoad);

init();
              
            
!
999px

Console