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/**
* Multi-column Bar Chart plotter is adapted from http://dygraphs.com/tests/plotters.html
*
* Modified to apply only to a supplied group of sets
*/
// Multiple column bar chart
function multiColumnGroupPlotter(e) {
// BEGIN HEADER BLOCK
// This first block can be copied to other plotters to capture the group
var g = e.dygraph;
var group;
var groupIdx = [];
var sets = [];
var allSets = e.allSeriesPoints;
var minIdx = Infinity;
var setName = e.setName;
var setNames = g.getLabels().slice(1);
var currGroup = g.attr_("group", setName);
for (var setIdx = 0; setIdx < allSets.length; setIdx++) {
// get the name and group of the current setIdx
setName = setNames[setIdx];
group = g.attr_("group", setName);
if (group === currGroup) {
//save the indv index and the points
groupIdx.push(setIdx);
sets.push(allSets[setIdx]);
// capturing the min indx helps to ensure we don't render the plotter
// multiple times
if (setIdx < minIdx) minIdx = setIdx;
}
}
// We'll employ the plotter only on the first of the group
if (e.seriesIndex !== minIdx) return;
// END HEADER BLOCK
var ctx = e.drawingContext;
var axis = g.attr_("axis", e.setName);
var y_bottom = g.toDomYCoord(0, axis == "y2" ? 1 : 0);
// Find the minimum separation between x-values.
// This determines the bar width.
var min_sep = Infinity;
for (var j = 0; j < sets.length; j++) {
var points = sets[j];
for (var i = 1; i < points.length; i++) {
var sep = points[i].canvasx - points[i - 1].canvasx;
if (sep < min_sep) min_sep = sep;
}
}
var bar_width = Math.floor(2.0 / 3 * min_sep);
var fillColors = [];
var strokeColors = g.getColors();
for (var i = 0; i < groupIdx.length; i++) {
fillColors.push(strokeColors[groupIdx[i]]);
}
for (var j = 0; j < sets.length; j++) {
ctx.fillStyle = fillColors[j];
ctx.strokeStyle = fillColors[j];
for (var i = 0; i < sets[j].length; i++) {
var p = sets[j][i];
var center_x = p.canvasx;
var x_left = center_x - (bar_width / 2) * (1 - j/(sets.length-1));
ctx.fillRect(x_left, p.canvasy,
bar_width/sets.length, y_bottom - p.canvasy);
ctx.strokeRect(x_left, p.canvasy,
bar_width/sets.length, y_bottom - p.canvasy);
}
}
}
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