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/**
* stem plotter extracted from series.R
*/
function stemPlotter(e) {
var ctx = e.drawingContext;
var points = e.points;
var y_bottom = e.dygraph.toDomYCoord(0);
ctx.fillStyle = e.color;
for (var i = 0; i < points.length; i++) {
var p = points[i];
var center_x = p.canvasx;
var center_y = p.canvasy;
ctx.beginPath();
ctx.moveTo(center_x, y_bottom);
ctx.lineTo(center_x, center_y);
ctx.stroke();
ctx.beginPath();
ctx.arc(center_x, center_y, 3, 0, 2*Math.PI);
ctx.stroke();
}
}
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