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/*
* The MIT License
Copyright (c) 2012 by Matt Burland
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
/*
"jquery.flot.labels2" Version 1.0 - Copyright (c) 2016 by Tobias Jüttner.
Inspired by "jquery.flot.labels" 0.2 - Copyright (c) 2012 by Matt Burland.

This plugin will draw labels next to the plotted points on your graph.

usage -
<script type="text/javascript">
    var names = ["foo","bar"];
    var data = { data: [[1,1],[2,2]], showLabels: true, labels: names, labelPlacement: "left" };
    $.plot($("#placeholder), [data], options);
</script>

For each series that you want labeled you need to set "showLabels" to true, set labels to an array of label names (strings)
and optionally set labelPlacement to one of "left", "right", "above" or "below" (below by default if not specified).
For the names, the array must not be larger than the length of the data. If any are missing (null) then the label for that point will
be skipped. For example, to label only the 1st and 3rd points:

    var names = ["foo", null, "bar"];

Labels are always drawn via canvas.
Additional options for series (with defaults):

    cColor: "#000",           // color for the text
    cFont: "9px sans-serif",  // font for the text
    cPadding: 4               // padding to add (where padding is added depends on "labelPlacement")
*/

(function ($) {

    function init(plot) {
        plot.hooks.drawSeries.push(drawSeries);
    }

    function drawSeries(plot, ctx, series) {
        if (!series.showLabels || !series.labels || series.labels.length == 0) {
            return;
        }
        ctx.save();
        ctx.translate(plot.getPlotOffset().left, plot.getPlotOffset().top);
        ctx.fillStyle = series.cColor;
        ctx.font = series.cFont;

        for (var i = 0; i < series.labels.length; i++) {
            if (series.labels[i]) {
                // Inspired by "drawSeriesLines"
                var points = series.datapoints.points
                var x = points[i * series.datapoints.pointsize];
                var y = points[i * series.datapoints.pointsize + 1];
                if (x >= series.xaxis.min && x <= series.xaxis.max && y >= series.yaxis.min && y <= series.yaxis.max)
                    drawLabel(series.labels[i], series.xaxis.p2c(x), series.yaxis.p2c(y));
            }
        }

        ctx.restore();

        function drawLabel(contents, x, y) {
            var radius = series.points.radius;
            var tWidth = ctx.measureText(contents).width;
            switch (series.labelPlacement) {
                case "above":
                    x = x - tWidth / 2;
                    y -= (series.cPadding + radius);
                    ctx.textBaseline = "bottom";
                    break;
                case "left":
                    x -= tWidth + series.cPadding + radius;
                    ctx.textBaseline = "middle";
                    break;
                case "right":
                    x += series.cPadding + radius;
                    ctx.textBaseline = "middle";
                    break;
                default:
                    ctx.textBaseline = "top";
                    y += series.cPadding + radius;
                    x = x - tWidth / 2;

            }
            ctx.fillText(contents, x, y);
        }
    }

    // labelPlacement options: below, above, left, right
    var options = {
        series: {
            showLabels: false,
            labels: [],
            labelClass: null,
            labelPlacement: "below",
            cColor: "#000",
            cFont: "9px sans-serif",
            cPadding: 4
        }
    };

    $.plot.plugins.push({
        init: init,
        options: options,
        name: "seriesLabels",
        version: "1.0"
    });
})(jQuery);

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Labels Example</title>


    <script type='text/javascript' src="/assets/js/jquery-2.1.3.min.js"></script>
    <script type='text/javascript' src='/assets/plugins/charts-flot/jquery.flot.min.js'></script>
    <script type="text/javascript" src='/assets/plugins/charts-flot/jquery.flot.labels.js'></script>
    <script type='text/javascript' src='/assets/plugins/charts-flot/jquery.flot.stack.min.js'></script>

    <script type="text/javascript">
$(function () {

            var options = {
                axisLabels: {show: true},
                series: {
                    stack: true,
                    bars: {
                        show: true,
                        barWidth: 0.9,
                        lineWidth: 0,
                        align: "center",
                        order:1
                    }
                },
                colors: ["#ad1986", "#2ea5b4"]
            };

            var data = [
                {
                    points: { show: true },
                    showLabels: true,
                    labels: ["Alpha","Beta","Gamma","Delta","Epsilon","Zeta","Eta","Theta"],
                    labelPlacement: "left",
                    canvasRender: true,
                    cColor: "#AD8200",
                    data:[ [1, 44],[2, 64],[3, 422],[4, 591],[5, 428],[6, 317],[7, 377],[8, 484]]
                },

                {
                    points: { show: true },
                    showLabels: true,
                    labels: ["Alpha","Beta","Gamma","Delta","Epsilon","Zeta","Eta","Theta"],
                    labelPlacement: "right",
                    canvasRender: true,
                    cColor: "#AD8200",
                    data:[ [1, 44],[2, 64],[3, 422],[4, 591],[5, 428],[6, 317],[7, 377],[8, 484]]
                }
            ];

            $.plot($("#placeholder"), data, options);
        });
    </script>
</head>
<body>
<div id="placeholder" style="width:500px; height:350px"></div>

</body>
</html>

                case "alt":
                    if (i % 2) {
                        // above
                        x = x - tWidth / 2;
                        y -= (series.cPadding + radius);
                        ctx.textBaseline = "bottom";
                        break;
                        } else {
                        //below
                        ctx.textBaseline = "top";
                        y += series.cPadding + radius;
                        x = x - tWidth / 2;
                        break;
                        };