Draws a line

line.js

// Draws a line from one circle(node) to another circle (node) 
var Line = function() {
  // Takes 
  // x,y      - starting x,y coordinate
  // toX, toY - ending x,y coordinate
  this.draw = function(x, y, toX, toY, r, ctx) {
    var moveToX = x;
    var moveToY = y + r;
    var lineToX = toX;
    var lineToY = toY - r;
    ctx.beginPath();
    ctx.moveTo(moveToX, moveToY);
    ctx.lineTo(lineToX, lineToY);
    ctx.stroke(); 
  };
};