//==========================================================================================
//			arc_pdf.txt
//	Author: Clif Collins			Date: Jan 2010
//==========================================================================================

//==========================================================================================
//				arcToPdf (result = 1 to 4 Quadrants)
//==========================================================================================
function arcToPdf(arc)
{
	var xstart,xsweep,swp,first,text;

	sweep = arc.sweep;
	start = arc.start;

	if (sweep < 0)
	{
		start = start + sweep;
		sweep = - sweep;
	}

	start = (start + 360) % 360;
	sweep = (sweep + 360) % 360;

	text = '';

	xstart = start;
	xsweep = sweep;
	first = true;

	while (xsweep > 0)
	{
		swp = 90;
		if (swp > xsweep) swp = xsweep;
		xsweep = xsweep - swp;
		text += PDF_makeArc(arc.cx,arc.cy,arc.radius,xstart,swp,first);
		first = false;
		xstart = xstart + swp;
	}
	
	return text;
}
//==========================================================================================
//		PDF_makeArc (0 - 90 Arc Quadrants) 4 - 90 deg Arcs make a Circle
//==========================================================================================
function PDF_makeArc(cx,cy,radius,start,sweep,first)
{
	var d,text
	var a1,a2,x1,y1,x2,y2;
	var p0x,p0y,p1x,p1y,p2x,p2y,p3x,p3y;
	var d1_x,d1_y,d2_x,d2_y,f,z;

	z = 0.552284749;		// 4 ( sqrt(2) - 1) / 3)
	f = sweep / 90;			// 0 - 90 Scale Factor
	z = z * f;
	
	d = radius * z;

	a1 = start;
	a2 = (-(90 - sweep)) + start;
	a1 = (a1 / 180) * Math.PI;
	a2 = (a2 / 180) * Math.PI;

	x1 = radius;
	y1 = 0;

	x2 = 0;
	y2 = radius;

	d1_x = radius;
	d1_y = d;

	d2_x = d;
	d2_y = radius;

	p0x = x1 * Math.cos(a1);
	p0y = x1 * Math.sin(a1);
	
	p1x = (d1_x * Math.cos(a1)) - (d1_y * Math.sin(a1));
	p1y = (d1_x * Math.sin(a1)) + (d1_y * Math.cos(a1));
	
	p2x = - (y2 * Math.sin(a2));
	p2y = y2 * Math.cos(a2);
	
	p3x = (d2_x * Math.cos(a2)) - (d2_y * Math.sin(a2));
	p3y = (d2_x * Math.sin(a2)) + (d2_y * Math.cos(a2));

	p0x = p0x + cx;
	p0y = p0y + cy;
	p0x = Math.round(p0x * 100) / 100;
	p0y = Math.round(p0y * 100) / 100;

	p1x = p1x + cx;
	p1y = p1y + cy;
	p1x = Math.round(p1x * 100) / 100;
	p1y = Math.round(p1y * 100) / 100;

	p2x = p2x + cx;
	p2y = p2y + cy;
	p2x = Math.round(p2x * 100) / 100;
	p2y = Math.round(p2y * 100) / 100;

	p3x = p3x + cx;
	p3y = p3y + cy;
	p3x = Math.round(p3x * 100) / 100;
	p3y = Math.round(p3y * 100) / 100;

	text = '';
	if (first) text += p0x + ' ' + p0y + ' m\n';
	text += p1x + ' ' + p1y + ' ' + p3x + ' ' + p3y + ' ' + p2x + ' ' + p2y + ' c\n';

	return text;
}