/**
* Utility class used for drawing area fills.
*
* @module charts
* @class Fills
* @constructor
*/
function Fills(cfg)
{
var attrs = {
area: {
getter: function()
{
return this._defaults || this._getAreaDefaults();
},
setter: function(val)
{
var defaults = this._defaults || this._getAreaDefaults();
this._defaults = Y.merge(defaults, val);
}
}
};
this.addAttrs(attrs, cfg);
this.get("styles");
}
Fills.prototype = {
/**
* Returns a path shape used for drawing fills.
*
* @method _getPath
* @return Path
* @private
*/
_getPath: function()
{
var path = this._path;
if(!path)
{
path = this.get("graph").get("graphic").addShape({type:"path"});
this._path = path;
}
return path;
},
/**
* Toggles visibility
*
* @method _toggleVisible
* @param {Boolean} visible indicates visibilitye
* @private
*/
_toggleVisible: function(visible)
{
if(this._path)
{
this._path.set("visible", visible);
}
},
/**
* Draws fill
*
* @method drawFill
* @param {Array} xcoords The x-coordinates for the series.
* @param {Array} ycoords The y-coordinates for the series.
* @protected
*/
drawFill: function(xcoords, ycoords)
{
if(xcoords.length < 1)
{
return;
}
var len = xcoords.length,
firstX = xcoords[0],
firstY = ycoords[0],
lastValidX = firstX,
lastValidY = firstY,
nextX,
nextY,
i = 1,
styles = this.get("styles").area,
path = this._getPath(),
color = styles.color || this._getDefaultColor(this.get("graphOrder"), "slice");
path.clear();
path.set("fill", {
color: color,
opacity: styles.alpha
});
path.set("stroke", {weight: 0});
path.moveTo(firstX, firstY);
for(; i < len; i = ++i)
{
nextX = xcoords[i];
nextY = ycoords[i];
if(isNaN(nextY))
{
lastValidX = nextX;
lastValidY = nextY;
continue;
}
path.lineTo(nextX, nextY);
lastValidX = nextX;
lastValidY = nextY;
}
path.end();
},
/**
* Draws a fill for a spline
*
* @method drawAreaSpline
* @protected
*/
drawAreaSpline: function()
{
if(this.get("xcoords").length < 1)
{
return;
}
var xcoords = this.get("xcoords"),
ycoords = this.get("ycoords"),
curvecoords = this.getCurveControlPoints(xcoords, ycoords),
len = curvecoords.length,
cx1,
cx2,
cy1,
cy2,
x,
y,
i = 0,
firstX = xcoords[0],
firstY = ycoords[0],
styles = this.get("styles").area,
path = this._getPath(),
color = styles.color || this._getDefaultColor(this.get("graphOrder"), "slice");
path.set("fill", {
color: color,
opacity: styles.alpha
});
path.set("stroke", {weight: 0});
path.moveTo(firstX, firstY);
for(; i < len; i = ++i)
{
x = curvecoords[i].endx;
y = curvecoords[i].endy;
cx1 = curvecoords[i].ctrlx1;
cx2 = curvecoords[i].ctrlx2;
cy1 = curvecoords[i].ctrly1;
cy2 = curvecoords[i].ctrly2;
path.curveTo(cx1, cy1, cx2, cy2, x, y);
}
if(this.get("direction") === "vertical")
{
path.lineTo(this._leftOrigin, y);
path.lineTo(this._leftOrigin, firstY);
}
else
{
path.lineTo(x, this._bottomOrigin);
path.lineTo(firstX, this._bottomOrigin);
}
path.lineTo(firstX, firstY);
path.end();
},
/**
* Draws a a stacked area spline
*
* @method drawStackedAreaSpline
* @protected
*/
drawStackedAreaSpline: function()
{
if(this.get("xcoords").length < 1)
{
return;
}
var xcoords = this.get("xcoords"),
ycoords = this.get("ycoords"),
curvecoords,
order = this.get("order"),
type = this.get("type"),
graph = this.get("graph"),
seriesCollection = graph.seriesTypes[type],
prevXCoords,
prevYCoords,
len,
cx1,
cx2,
cy1,
cy2,
x,
y,
i = 0,
firstX,
firstY,
styles = this.get("styles").area,
path = this._getPath(),
color = styles.color || this._getDefaultColor(this.get("graphOrder"), "slice");
firstX = xcoords[0];
firstY = ycoords[0];
curvecoords = this.getCurveControlPoints(xcoords, ycoords);
len = curvecoords.length;
path.set("fill", {
color: color,
opacity: styles.alpha
});
path.set("stroke", {weight: 0});
path.moveTo(firstX, firstY);
for(; i < len; i = ++i)
{
x = curvecoords[i].endx;
y = curvecoords[i].endy;
cx1 = curvecoords[i].ctrlx1;
cx2 = curvecoords[i].ctrlx2;
cy1 = curvecoords[i].ctrly1;
cy2 = curvecoords[i].ctrly2;
path.curveTo(cx1, cy1, cx2, cy2, x, y);
}
if(order > 0)
{
prevXCoords = seriesCollection[order - 1].get("xcoords").concat().reverse();
prevYCoords = seriesCollection[order - 1].get("ycoords").concat().reverse();
curvecoords = this.getCurveControlPoints(prevXCoords, prevYCoords);
i = 0;
len = curvecoords.length;
path.lineTo(prevXCoords[0], prevYCoords[0]);
for(; i < len; i = ++i)
{
x = curvecoords[i].endx;
y = curvecoords[i].endy;
cx1 = curvecoords[i].ctrlx1;
cx2 = curvecoords[i].ctrlx2;
cy1 = curvecoords[i].ctrly1;
cy2 = curvecoords[i].ctrly2;
path.curveTo(cx1, cy1, cx2, cy2, x, y);
}
}
else
{
if(this.get("direction") === "vertical")
{
path.lineTo(this._leftOrigin, ycoords[ycoords.length-1]);
path.lineTo(this._leftOrigin, firstY);
}
else
{
path.lineTo(xcoords[xcoords.length-1], this._bottomOrigin);
path.lineTo(firstX, this._bottomOrigin);
}
}
path.lineTo(firstX, firstY);
path.end();
},
/**
* Storage for default area styles.
*
* @property _defaults
* @type Object
* @private
*/
_defaults: null,
/**
* Concatenates coordinate array with correct coordinates for closing an area fill.
*
* @method _getClosingPoints
* @return Array
* @protected
*/
_getClosingPoints: function()
{
var xcoords = this.get("xcoords").concat(),
ycoords = this.get("ycoords").concat();
if(this.get("direction") === "vertical")
{
xcoords.push(this._leftOrigin);
xcoords.push(this._leftOrigin);
ycoords.push(ycoords[ycoords.length - 1]);
ycoords.push(ycoords[0]);
}
else
{
xcoords.push(xcoords[xcoords.length - 1]);
xcoords.push(xcoords[0]);
ycoords.push(this._bottomOrigin);
ycoords.push(this._bottomOrigin);
}
xcoords.push(xcoords[0]);
ycoords.push(ycoords[0]);
return [xcoords, ycoords];
},
/**
* Concatenates coordinate array with the correct coordinates for closing an area stack.
*
* @method _getStackedClosingPoints
* @return Array
* @protected
*/
_getStackedClosingPoints: function()
{
var order = this.get("order"),
type = this.get("type"),
graph = this.get("graph"),
direction = this.get("direction"),
seriesCollection = graph.seriesTypes[type],
prevXCoords,
prevYCoords,
allXCoords = this.get("xcoords").concat(),
allYCoords = this.get("ycoords").concat(),
firstX = allXCoords[0],
firstY = allYCoords[0];
if(order > 0)
{
prevXCoords = seriesCollection[order - 1].get("xcoords").concat();
prevYCoords = seriesCollection[order - 1].get("ycoords").concat();
allXCoords = allXCoords.concat(prevXCoords.concat().reverse());
allYCoords = allYCoords.concat(prevYCoords.concat().reverse());
allXCoords.push(allXCoords[0]);
allYCoords.push(allYCoords[0]);
}
else
{
if(direction === "vertical")
{
allXCoords.push(this._leftOrigin);
allXCoords.push(this._leftOrigin);
allYCoords.push(allYCoords[allYCoords.length-1]);
allYCoords.push(firstY);
}
else
{
allXCoords.push(allXCoords[allXCoords.length-1]);
allXCoords.push(firstX);
allYCoords.push(this._bottomOrigin);
allYCoords.push(this._bottomOrigin);
}
}
return [allXCoords, allYCoords];
},
/**
* Returns default values for area styles.
*
* @method _getAreaDefaults
* @return Object
* @private
*/
_getAreaDefaults: function()
{
return {
};
}
};
Y.augment(Fills, Y.Attribute);
Y.Fills = Fills;
