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// the _errorplotter combined with the _lineplotter function extracted from dygraphs-combined-dev.js, available for use in conjunction with other per-series plotters and group plotters
function errorplotter(e) {
var g = e.dygraph;
var setName = e.setName;
var errorBars = g.getBooleanOption("errorBars") ||
g.getBooleanOption("customBars");
if (!errorBars) return;
var fillGraph = g.getBooleanOption("fillGraph", setName);
if (fillGraph) {
console.warn("Can't use fillGraph option with error bars");
}
var ctx = e.drawingContext;
var color = e.color;
var fillAlpha = g.getNumericOption('fillAlpha', setName);
var stepPlot = g.getBooleanOption("stepPlot", setName);
var points = e.points;
var iter = Dygraph.createIterator(points, 0, points.length,
DygraphCanvasRenderer._getIteratorPredicate(
g.getBooleanOption("connectSeparatedPoints", setName)));
var newYs;
// setup graphics context
var prevX = NaN;
var prevY = NaN;
var prevYs = [-1, -1];
// should be same color as the lines but only 15% opaque.
var rgb = Dygraph.toRGB_(color);
var err_color =
'rgba(' + rgb.r + ',' + rgb.g + ',' + rgb.b + ',' + fillAlpha + ')';
ctx.fillStyle = err_color;
ctx.beginPath();
var isNullUndefinedOrNaN = function(x) {
return (x === null ||
x === undefined ||
isNaN(x));
};
while (iter.hasNext) {
var point = iter.next();
if ((!stepPlot && isNullUndefinedOrNaN(point.y)) ||
(stepPlot && !isNaN(prevY) && isNullUndefinedOrNaN(prevY))) {
prevX = NaN;
continue;
}
newYs = [ point.y_bottom, point.y_top ];
if (stepPlot) {
prevY = point.y;
}
// The documentation specifically disallows nulls inside the point arrays,
// but in case it happens we should do something sensible.
if (isNaN(newYs[0])) newYs[0] = point.y;
if (isNaN(newYs[1])) newYs[1] = point.y;
newYs[0] = e.plotArea.h * newYs[0] + e.plotArea.y;
newYs[1] = e.plotArea.h * newYs[1] + e.plotArea.y;
if (!isNaN(prevX)) {
if (stepPlot) {
ctx.moveTo(prevX, prevYs[0]);
ctx.lineTo(point.canvasx, prevYs[0]);
ctx.lineTo(point.canvasx, prevYs[1]);
} else {
ctx.moveTo(prevX, prevYs[0]);
ctx.lineTo(point.canvasx, newYs[0]);
ctx.lineTo(point.canvasx, newYs[1]);
}
ctx.lineTo(prevX, prevYs[1]);
ctx.closePath();
}
prevYs = newYs;
prevX = point.canvasx;
}
ctx.fill();
}
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