var yPosMax = 175;
var yPosMin = 125;
var yPosStart = 150;
var xPosStart = -50;
var yPosChangeMultiplier = 60;
var xPosChangeMin = 125;
var xPosChangeMultiplier = 25;
var yControlMultiplier = 20;
var yControlMin = 40;
canvas = document.getElementById('canvas');
context = canvas.getContext('2d');
context.fillStyle = '#ecf0f1';
var xPos = xPosStart;
var yPos = yPosStart;
context.beginPath();
context.moveTo(xPos, yPos);
while (xPos < canvas.width) {
lastX = xPos;
xPos += Math.floor(Math.random() * xPosChangeMultiplier + xPosChangeMin);
yPos += Math.floor(Math.random() * yPosChangeMultiplier - yPosChangeMultiplier/2);
while (yPos < yPosMin) {
yPos += Math.floor(Math.random() * yPosChangeMultiplier/2);
}
while (yPos > yPosMax) {
yPos -= Math.floor(Math.random() * yPosChangeMultiplier/2);
}
controlX = (lastX + xPos)/2;
controlY = yPos-Math.floor(Math.random() * yControlMultiplier + yControlMin);
