/**
 * Copyright (c) 2006-2015, JGraph Ltd
 * Copyright (c) 2006-2015, Gaudenz Alder
 */
/**
 * Class: mxDoubleEllipse
 *
 * Extends <mxShape> to implement a double ellipse shape. This shape is
 * registered under <mxConstants.SHAPE_DOUBLE_ELLIPSE> in <mxCellRenderer>.
 * Use the following override to only fill the inner ellipse in this shape:
 * 
 * (code)
 * mxDoubleEllipse.prototype.paintVertexShape = function(c, x, y, w, h)
 * {
 *   c.ellipse(x, y, w, h);
 *   c.stroke();
 *   
 *   var inset = mxUtils.getValue(this.style, mxConstants.STYLE_MARGIN, Math.min(3 + this.strokewidth, Math.min(w / 5, h / 5)));
 *   x += inset;
 *   y += inset;
 *   w -= 2 * inset;
 *   h -= 2 * inset;
 *   
 *   if (w > 0 && h > 0)
 *   {
 *     c.ellipse(x, y, w, h);
 *   }
 *   
 *   c.fillAndStroke();
 * };
 * (end)
 * 
 * Constructor: mxDoubleEllipse
 *
 * Constructs a new ellipse shape.
 *
 * Parameters:
 *
 * bounds - <mxRectangle> that defines the bounds. This is stored in
 * <mxShape.bounds>.
 * fill - String that defines the fill color. This is stored in <fill>.
 * stroke - String that defines the stroke color. This is stored in <stroke>.
 * strokewidth - Optional integer that defines the stroke width. Default is
 * 1. This is stored in <strokewidth>.
 */
function mxDoubleEllipse(bounds, fill, stroke, strokewidth)
{
	mxShape.call(this);
	this.bounds = bounds;
	this.fill = fill;
	this.stroke = stroke;
	this.strokewidth = (strokewidth != null) ? strokewidth : 1;
};

/**
 * Extends mxShape.
 */
mxUtils.extend(mxDoubleEllipse, mxShape);

/**
 * Variable: vmlScale
 * 
 * Scale for improving the precision of VML rendering. Default is 10.
 */
mxDoubleEllipse.prototype.vmlScale = 10;

/**
 * Function: paintBackground
 * 
 * Paints the background.
 */
mxDoubleEllipse.prototype.paintBackground = function(c, x, y, w, h)
{
	c.ellipse(x, y, w, h);
	c.fillAndStroke();
};

/**
 * Function: paintForeground
 * 
 * Paints the foreground.
 */
mxDoubleEllipse.prototype.paintForeground = function(c, x, y, w, h)
{
	if (!this.outline)
	{
		var margin = mxUtils.getValue(this.style, mxConstants.STYLE_MARGIN, Math.min(3 + this.strokewidth, Math.min(w / 5, h / 5)));
		x += margin;
		y += margin;
		w -= 2 * margin;
		h -= 2 * margin;
		
		// FIXME: Rounding issues in IE8 standards mode (not in 1.x)
		if (w > 0 && h > 0)
		{
			c.ellipse(x, y, w, h);
		}
		
		c.stroke();
	}
};

/**
 * Function: getLabelBounds
 * 
 * Returns the bounds for the label.
 */
mxDoubleEllipse.prototype.getLabelBounds = function(rect)
{
	var margin = (mxUtils.getValue(this.style, mxConstants.STYLE_MARGIN, Math.min(3 + this.strokewidth,
			Math.min(rect.width / 5 / this.scale, rect.height / 5 / this.scale)))) * this.scale;

	return new mxRectangle(rect.x + margin, rect.y + margin, rect.width - 2 * margin, rect.height - 2 * margin);
};