/**
 * Copyright (c) 2006-2015, JGraph Holdings Ltd
 * Copyright (c) 2006-2015, draw.io AG
 */
/**
 * Class: mxCylinder
 *
 * Extends <mxShape> to implement an cylinder shape. If a
 * custom shape with one filled area and an overlay path is
 * needed, then this shape's <redrawPath> should be overridden.
 * This shape is registered under <mxConstants.SHAPE_CYLINDER>
 * in <mxCellRenderer>.
 * 
 * Constructor: mxCylinder
 *
 * Constructs a new cylinder 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 mxCylinder(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(mxCylinder, mxShape);

/**
 * Variable: maxHeight
 *
 * Defines the maximum height of the top and bottom part
 * of the cylinder shape.
 */
mxCylinder.prototype.maxHeight = 40;

/**
 * Function: paintVertexShape
 * 
 * Redirects to redrawPath for subclasses to work.
 */
mxCylinder.prototype.paintVertexShape = function(c, x, y, w, h)
{
	c.translate(x, y);
	c.begin();
	this.redrawPath(c, x, y, w, h, false);
	c.fillAndStroke();
	
	if (!this.outline || this.style == null || mxUtils.getValue(
		this.style, mxConstants.STYLE_BACKGROUND_OUTLINE, 0) == 0)
	{
		c.setShadow(false);
		c.begin();
		this.redrawPath(c, x, y, w, h, true);
		c.stroke();
	}
};

/**
 * Function: getCylinderSize
 *
 * Returns the cylinder size.
 */
mxCylinder.prototype.getCylinderSize = function(x, y, w, h)
{
	return Math.min(this.maxHeight, Math.round(h / 5));
};

/**
 * Function: redrawPath
 *
 * Draws the path for this shape.
 */
mxCylinder.prototype.redrawPath = function(c, x, y, w, h, isForeground)
{
	var dy = this.getCylinderSize(x, y, w, h);
	
	if ((isForeground && this.fill != null) || (!isForeground && this.fill == null))
	{
		c.moveTo(0, dy);
		c.curveTo(0, 2 * dy, w, 2 * dy, w, dy);
		
		// Needs separate shapes for correct hit-detection
		if (!isForeground)
		{
			c.stroke();
			c.begin();
		}
	}
	
	if (!isForeground)
	{
		c.moveTo(0, dy);
		c.curveTo(0, -dy / 3, w, -dy / 3, w, dy);
		c.lineTo(w, h - dy);
		c.curveTo(w, h + dy / 3, 0, h + dy / 3, 0, h - dy);
		c.close();
	}
};
