/**
 * Constructs a new bar mark with default properties. Bars are not typically
 * constructed directly, but by adding to a panel or an existing mark via
 * {@link pv.Mark#add}.
 *
 * @class Represents a bar: an axis-aligned rectangle that can be stroked and
 * filled. Bars are used for many chart types, including bar charts, histograms
 * and Gantt charts. Bars can also be used as decorations, for example to draw a
 * frame border around a panel; in fact, a panel is a special type (a subclass)
 * of bar.
 *
 * <p>Bars can be positioned in several ways. Most commonly, one of the four
 * corners is fixed using two margins, and then the width and height properties
 * determine the extent of the bar relative to this fixed location. For example,
 * using the bottom and left properties fixes the bottom-left corner; the width
 * then extends to the right, while the height extends to the top. As an
 * alternative to the four corners, a bar can be positioned exclusively using
 * margins; this is convenient as an inset from the containing panel, for
 * example. See {@link pv.Mark} for details on the prioritization of redundant
 * positioning properties.
 *
 * <p>See also the <a href="../../api/Bar.html">Bar guide</a>.
 *
 * @extends pv.Mark
 */
pv.Bar = function() {
  pv.Mark.call(this);
};

pv.Bar.prototype = pv.extend(pv.Mark)
    .property("width", Number)
    .property("height", Number)
    .property("lineWidth", Number)
    .property("strokeStyle", pv.color)
    .property("fillStyle", pv.color);

pv.Bar.prototype.type = "bar";

/**
 * The width of the bar, in pixels. If the left position is specified, the bar
 * extends rightward from the left edge; if the right position is specified, the
 * bar extends leftward from the right edge.
 *
 * @type number
 * @name pv.Bar.prototype.width
 */

/**
 * The height of the bar, in pixels. If the bottom position is specified, the
 * bar extends upward from the bottom edge; if the top position is specified,
 * the bar extends downward from the top edge.
 *
 * @type number
 * @name pv.Bar.prototype.height
 */

/**
 * The width of stroked lines, in pixels; used in conjunction with
 * <tt>strokeStyle</tt> to stroke the bar's border.
 *
 * @type number
 * @name pv.Bar.prototype.lineWidth
 */

/**
 * The style of stroked lines; used in conjunction with <tt>lineWidth</tt> to
 * stroke the bar's border. The default value of this property is null, meaning
 * bars are not stroked by default.
 *
 * @type string
 * @name pv.Bar.prototype.strokeStyle
 * @see pv.color
 */

/**
 * The bar fill style; if non-null, the interior of the bar is filled with the
 * specified color. The default value of this property is a categorical color.
 *
 * @type string
 * @name pv.Bar.prototype.fillStyle
 * @see pv.color
 */

/**
 * Default properties for bars. By default, there is no stroke and the fill
 * style is a categorical color.
 *
 * @type pv.Bar
 */
pv.Bar.prototype.defaults = new pv.Bar()
    .extend(pv.Mark.prototype.defaults)
    .lineWidth(1.5)
    .fillStyle(pv.Colors.category20().by(pv.parent));