ChartJs - 具有多个数据集的圆环图上的圆形边框 [英] ChartJs - Round borders on a doughnut chart with multiple datasets

问题描述

我有一个包含多个数据集的常规 Chartjs 甜甜圈图，对数据集使用以下代码:

I have a regular Chartjs doughnut chart with multiple datasets, using this code for the dataset:

datasets: 
    [
        {
            label: 'Bugs',
            data: [ 60 , 6.6666666666667 , 33.333333333333 ],
            backgroundColor: ['#25CFE4', '#92E7F1', '#eeeeee'],
        }, {
            label: 'Fixes',
            data: [ 60 , 0.44444444444444 , 39.555555555556 ],
            backgroundColor: ['#514463', '#8C75AB', '#eeeeee'],
        }, {
            label: 'Redesigns',
            data: [
            33.333333333333 , 10.37037037037 , 56.296296296296 ],
            backgroundColor: ['#1B745F', '#40C1A0', '#eeeeee'],
        }
    ]
};

我正在尝试在秤上实现圆形边缘，我设法进行了第一轮，但其他人没有运气.

I am trying to implement rounded edges on the scales, I manage to make the first one round, but no luck with the others.

基本上，这就是我现在所拥有的

Basically, this is what I have now

这就是我想要实现的目标(对于可怜的 Photoshop 感到抱歉)

And this is what I am trying to achieve (sorry for the poor photoshop)

我不介意刻度的开头是否也是圆形的，或者灰色区域(我将其涂成灰色只是为了给人一种尚未填充的印象)气体的边缘也是圆形的.

I don't mind if the start of the scale is also round or the grey area (which I painted grey just to give the impression of something not yet filled) gas round edges too.

谢谢

推荐答案

又做了一些调整，终于搞定了.这正是你想要的:

Made a few more adjustments and finally got it.This does exactly what you want:

    Chart.pluginService.register({
        afterUpdate: function (chart) {
                var a=chart.config.data.datasets.length -1;
                for (let i in chart.config.data.datasets) {
                    for(var j = chart.config.data.datasets[i].data.length - 1; j>= 0;--j) { 
                        if (Number(j) == (chart.config.data.datasets[i].data.length - 1))
                            continue;
                        var arc = chart.getDatasetMeta(i).data[j];
                        arc.round = {
                            x: (chart.chartArea.left + chart.chartArea.right) / 2,
                            y: (chart.chartArea.top + chart.chartArea.bottom) / 2,
                            radius: chart.innerRadius + chart.radiusLength / 2 + (a * chart.radiusLength),
                            thickness: chart.radiusLength / 2 - 1,
                            backgroundColor: arc._model.backgroundColor
                        }
                    }
                    a--;
                }
        },

        afterDraw: function (chart) {
                var ctx = chart.chart.ctx;
                for (let i in chart.config.data.datasets) {
                    for(var j = chart.config.data.datasets[i].data.length - 1; j>= 0;--j) { 
                        if (Number(j) == (chart.config.data.datasets[i].data.length - 1))
                            continue;
                        var arc = chart.getDatasetMeta(i).data[j];
                        var startAngle = Math.PI / 2 - arc._view.startAngle;
                        var endAngle = Math.PI / 2 - arc._view.endAngle;

                        ctx.save();
                        ctx.translate(arc.round.x, arc.round.y);
                        console.log(arc.round.startAngle)
                        ctx.fillStyle = arc.round.backgroundColor;
                        ctx.beginPath();
                        //ctx.arc(arc.round.radius * Math.sin(startAngle), arc.round.radius * Math.cos(startAngle), arc.round.thickness, 0, 2 * Math.PI);
                        ctx.arc(arc.round.radius * Math.sin(endAngle), arc.round.radius * Math.cos(endAngle), arc.round.thickness, 0, 2 * Math.PI);
                        ctx.closePath();
                        ctx.fill();
                        ctx.restore();
                    }
                }
        },
    });

小提琴 - http://jsfiddle.net/tgyxmkLj/1/

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