实现这一点的唯一方法是扩展现有doughnut
控制器并update
使用您自己的逻辑来覆盖该方法来确定间距。
这是一个演示如何执行此操作的示例。通过这个实现,我添加了一个新的圆环图选项属性,称为datasetRadiusBuffer
控制每个数据集之间的空白。
var helpers = Chart.helpers;
// this option will control the white space between embedded charts when there is more than 1 dataset
helpers.extend(Chart.defaults.doughnut, {
datasetRadiusBuffer: 0
});
Chart.controllers.doughnut = Chart.controllers.doughnut.extend({
update: function(reset) {
var me = this;
var chart = me.chart,
chartArea = chart.chartArea,
opts = chart.options,
arcOpts = opts.elements.arc,
availableWidth = chartArea.right - chartArea.left - arcOpts.borderWidth,
availableHeight = chartArea.bottom - chartArea.top - arcOpts.borderWidth,
minSize = Math.min(availableWidth, availableHeight),
offset = {
x: 0,
y: 0
},
meta = me.getMeta(),
cutoutPercentage = opts.cutoutPercentage,
circumference = opts.circumference;
// If the chart's circumference isn't a full circle, calculate minSize as a ratio of the width/height of the arc
if (circumference < Math.PI * 2.0) {
var startAngle = opts.rotation % (Math.PI * 2.0);
startAngle += Math.PI * 2.0 * (startAngle >= Math.PI ? -1 : startAngle < -Math.PI ? 1 : 0);
var endAngle = startAngle + circumference;
var start = {x: Math.cos(startAngle), y: Math.sin(startAngle)};
var end = {x: Math.cos(endAngle), y: Math.sin(endAngle)};
var contains0 = (startAngle <= 0 && 0 <= endAngle) || (startAngle <= Math.PI * 2.0 && Math.PI * 2.0 <= endAngle);
var contains90 = (startAngle <= Math.PI * 0.5 && Math.PI * 0.5 <= endAngle) || (startAngle <= Math.PI * 2.5 && Math.PI * 2.5 <= endAngle);
var contains180 = (startAngle <= -Math.PI && -Math.PI <= endAngle) || (startAngle <= Math.PI && Math.PI <= endAngle);
var contains270 = (startAngle <= -Math.PI * 0.5 && -Math.PI * 0.5 <= endAngle) || (startAngle <= Math.PI * 1.5 && Math.PI * 1.5 <= endAngle);
var cutout = cutoutPercentage / 100.0;
var min = {x: contains180 ? -1 : Math.min(start.x * (start.x < 0 ? 1 : cutout), end.x * (end.x < 0 ? 1 : cutout)), y: contains270 ? -1 : Math.min(start.y * (start.y < 0 ? 1 : cutout), end.y * (end.y < 0 ? 1 : cutout))};
var max = {x: contains0 ? 1 : Math.max(start.x * (start.x > 0 ? 1 : cutout), end.x * (end.x > 0 ? 1 : cutout)), y: contains90 ? 1 : Math.max(start.y * (start.y > 0 ? 1 : cutout), end.y * (end.y > 0 ? 1 : cutout))};
var size = {width: (max.x - min.x) * 0.5, height: (max.y - min.y) * 0.5};
minSize = Math.min(availableWidth / size.width, availableHeight / size.height);
offset = {x: (max.x + min.x) * -0.5, y: (max.y + min.y) * -0.5};
}
chart.borderWidth = me.getMaxBorderWidth(meta.data);
chart.outerRadius = Math.max((minSize - chart.borderWidth) / 2, 0);
chart.innerRadius = Math.max(cutoutPercentage ? (chart.outerRadius / 100) * (cutoutPercentage) : 0, 0);
chart.radiusLength = ((chart.outerRadius - chart.innerRadius) / chart.getVisibleDatasetCount()) + 25;
chart.offsetX = offset.x * chart.outerRadius;
chart.offsetY = offset.y * chart.outerRadius;
meta.total = me.calculateTotal();
me.outerRadius = chart.outerRadius - (chart.radiusLength * me.getRingIndex(me.index));
me.innerRadius = Math.max(me.outerRadius - chart.radiusLength, 0);
// factor in the radius buffer if the chart has more than 1 dataset
if (me.index > 0) {
me.outerRadius -= opts.datasetRadiusBuffer;
me.innerRadius -= opts.datasetRadiusBuffer;
}
helpers.each(meta.data, function(arc, index) {
me.updateElement(arc, index, reset);
});
},
});
你可以在这个codepen 上看到一个活生生的例子。
本文收集自互联网,转载请注明来源。
如有侵权,请联系[email protected] 删除。
我来说两句