+ var anySeriesFilled = (function() {
+ for (var i = 0; i < setNames.length; i++) {
+ if (g.getBooleanOption("fillGraph", setNames[i])) return true;
+ }
+ return false;
+ })();
+
+ if (!anySeriesFilled) return;
+
+ var area = e.plotArea;
+ var sets = e.allSeriesPoints;
+ var setCount = sets.length;
+
+ var fillAlpha = g.getNumericOption('fillAlpha');
+ var stackedGraph = g.getBooleanOption("stackedGraph");
+ var colors = g.getColors();
+
+ // For stacked graphs, track the baseline for filling.
+ //
+ // The filled areas below graph lines are trapezoids with two
+ // vertical edges. The top edge is the line segment being drawn, and
+ // the baseline is the bottom edge. Each baseline corresponds to the
+ // top line segment from the previous stacked line. In the case of
+ // step plots, the trapezoids are rectangles.
+ var baseline = {};
+ var currBaseline;
+ var prevStepPlot; // for different line drawing modes (line/step) per series
+
+ // Helper function to trace a line back along the baseline.
+ var traceBackPath = function(ctx, baselineX, baselineY, pathBack) {
+ ctx.lineTo(baselineX, baselineY);
+ if (stackedGraph) {
+ for (var i = pathBack.length - 1; i >= 0; i--) {
+ var pt = pathBack[i];
+ ctx.lineTo(pt[0], pt[1]);
+ }
+ }
+ };
+
+ // process sets in reverse order (needed for stacked graphs)
+ for (var setIdx = setCount - 1; setIdx >= 0; setIdx--) {
+ var ctx = e.drawingContext;
+ var setName = setNames[setIdx];
+ if (!g.getBooleanOption('fillGraph', setName)) continue;
+
+ var stepPlot = g.getBooleanOption('stepPlot', setName);
+ var color = colors[setIdx];
+ var axis = g.axisPropertiesForSeries(setName);
+ var axisY = 1.0 + axis.minyval * axis.yscale;
+ if (axisY < 0.0) axisY = 0.0;
+ else if (axisY > 1.0) axisY = 1.0;
+ axisY = area.h * axisY + area.y;
+
+ var points = sets[setIdx];
+ var iter = Dygraph.createIterator(points, 0, points.length,
+ DygraphCanvasRenderer._getIteratorPredicate(
+ g.getBooleanOption("connectSeparatedPoints", setName)));
+
+ // setup graphics context
+ var prevX = NaN;
+ var prevYs = [-1, -1];
+ var newYs;
+ // 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 last_x, is_first = true;
+
+ // If the point density is high enough, dropping segments on their way to
+ // the canvas justifies the overhead of doing so.
+ if (points.length > 2 * g.width_) {
+ ctx = DygraphCanvasRenderer._fastCanvasProxy(ctx);