/*
    author: @fabiantheblind
    This script creates a graphic line in circles
    based on this processing sketch by PhiLho
    http://forum.processing.org/topic/how-can-i-draw-this#25080000000995029
    the size of the page
    */
var ph = 150;
var pw = 150;

// we need a doc
// use pw and phas size
var doc = app.documents.add({
	documentPreferences: {
		pageHeight: ph,
		pageWidth: pw,
	},
});

// the page is already there
var page = doc.pages.item(0);
// get the center of the page
var cx = pw / 2;
var cy = ph / 2;
// define the initial radius
var init_rad = 0.9 * (pw / 2);
var radius = init_rad;
//this is the amplitude fpr the disturb
var amplitude = radius / 1;

// create a graphicLine
var gl = page.graphicLines.add();
var radians_angle; // this will hold the angle in radians
var rounds = 75; // how many rounds

//~   we need to count the path points.
//~   the first an second always exist in  a graphic line
var count = 0;
var degree_step = 4;

// loop through the data.anchors

for (var degrees = 0; degrees < 360 * rounds; degrees += 360 / degree_step) {
	// calculate the degree to radians
	radians_angle = ((degrees / 360) % 360) * 2 * Math.PI;
	// get the point
	var point = gl.paths[0].pathPoints[count];
	// set the disturb to 0 if you want straight lines
	// calc the position on the circle
	var x1 = cx + radius * Math.cos(radians_angle);
	var y1 = cy + radius * Math.sin(radians_angle);
	radius -= 0.2;
	/**
	 * a graphicLine always has 2 path points
	 * so we need to add points only from the third index
	 *
	 */
	if (count < 2) {
		point.anchor = [x1, y1];

		if (count % 4 == 0) point.rightDirection = [x1, y1 + radius];
		if (count % 4 == 1) point.rightDirection = [x1 - radius, y1];
		if (count % 4 == 2) point.rightDirection = [x1, y1 - radius];
		if (count % 4 == 3) point.rightDirection = [x1 + radius, y1];
	} else {
		point = gl.paths[0].pathPoints.add();
		point.anchor = [x1, y1];
		if (count % 4 == 0) point.rightDirection = [x1, y1 + radius];
		if (count % 4 == 1) point.rightDirection = [x1 - radius, y1];
		if (count % 4 == 2) point.rightDirection = [x1, y1 - radius];
		if (count % 4 == 3) point.rightDirection = [x1 + radius, y1];
	}

	// now make the circle smaller by every round
	//if(degrees%360 == 0)radius-= ((init_rad)/rounds );
	count++;
}