var centerX = 150;
var centerY = 150;
var gap = 1.8; // increase this for spacing between spiral lines
var STEPS_PER_ROTATION = 60; // increasing this makes the curve smoother
var increment = 2*Math.PI/STEPS_PER_ROTATION;
var theta = increment;
while( theta < 20*Math.PI) {
var newX = centerX + theta * Math.cos(theta) * gap;
var newY = centerY + theta * Math.sin(theta) * gap;
cxt.lineTo(newX, newY);
theta = theta + increment;
}
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