Center text on doughnut chart that has a title with position top or bottom

[Mike Poole]

I have added the plugin to my ChartJS doughnut chart (below) to add the center text and this all works fine

My issue is that if I add a title to the chart (position either `'top'` or `'bottom'` then the text does not center as the height of the canvas is the doughnut AND the title.

Is there a way to remove take into account the height of the title when calculating the `textY` (height/2)? There do not appear to be any available properties available to offset the center to correctly place the text

Many thanks

Mike

     afterDraw: function (chart, options) {

                            var newFillText = '25%';

                            if (chart.options.centertext) {

                                var width = chart.chart.width,

                                    height = chart.chart.height,

                                    ctx = chart.chart.ctx;

                                ctx.restore();

                                var fontSize = (height / 130).toFixed(2); //was 114

                                ctx.font = fontSize + "em sans-serif";

                                ctx.textBaseline = "middle";

                                var text = chart.options.centertext,

                                    textX = Math.round((width - ctx.measureText(newFillText).width) / 2),

                                    textY = height / 2;

                                ctx.fillText(newFillText, textX, textY);

                                ctx.save();

                            }

                        },