click2add.js

Highcharts.chart('container1', {
    chart: {
        type: 'scatter',
        margin: [70, 50, 60, 80],
        events: {
            click: function (e) {
                // find the clicked values and the series
                var x = Math.round(e.xAxis[0].value),
                    y = Math.round(e.yAxis[0].value),
                    series = this.series[0];

                // Add it
                series.addPoint([x, y]);

            }
        }
    },
    title: {
        text: 'User supplied data'
    },
    subtitle: {
        text: 'Click the plot area to add a point. Click a point to remove it.'
    },
    xAxis: {
        gridLineWidth: 1,
        minPadding: 0.2,
        maxPadding: 0.2,
        maxZoom: 60
    },
    yAxis: {
        title: {
            text: 'Value'
        },
        minPadding: 0.2,
        maxPadding: 0.2,
        maxZoom: 60,
        plotLines: [{
            value: 0,
            width: 1,
            color: '#808080'
        }]
    },
    legend: {
        enabled: false
    },
    exporting: {
        enabled: false
    },
    plotOptions: {
        series: {
            lineWidth: 1,
            point: {
                events: {
                    'click': function () {
                        if (this.series.data.length > 1) {
                            this.remove();
                        }
                    }
                }
            }
        }
    },
    series: [{
        data: [[20, 20], [80, 80]]
    }]
});