答案 0 :(得分:3)
实际上检测重叠的工具提示非常困难。
我最终通过停用工具箱中的颜色,减小工具提示的大小,移动工具提示更靠近外边框并隐藏所有工具提示(小于2%)来解决它。示例如下:
我用了以下代码:
Chart.Tooltip.positioners.outer = function(elements) {
if (!elements.length) {
return false;
}
var i, len;
var x = 0;
var y = 0;
for (i = 0, len = elements.length; i < len; ++i) {
var el = elements[i];
if (el && el.hasValue()) {
var elPosX = el._view.x+0.95*el._view.outerRadius*Math.cos((el._view.endAngle-el._view.startAngle)/2+el._view.startAngle);
var elPosY = el._view.y+0.95*el._view.outerRadius*Math.sin((el._view.endAngle-el._view.startAngle)/2+el._view.startAngle);
if (x < elPosX) {
x = elPosX;
}
if (y < elPosY) {
y = elPosY;
}
}
}
return {
x: Math.round(x),
y: Math.round(y)
};
},
Chart.pluginService.register({
beforeRender: function (chart) {
if (chart.config.options.showAllTooltips) {
// create an array of tooltips
// we can't use the chart tooltip because there is only one tooltip per chart
chart.pluginTooltips = [];
chart.config.data.datasets.forEach(function (dataset, i) {
chart.getDatasetMeta(i).data.forEach(function (sector, j) {
if ((sector._view.endAngle-sector._view.startAngle) > 2*Math.PI*0.02) {
chart.pluginTooltips.push(
new Chart.Tooltip({
_chart: chart.chart,
_chartInstance: chart,
_data: chart.data,
_options: chart.options.tooltips,
_active: [sector]
}, chart)
);
}
});
});
// turn off normal tooltips
chart.options.tooltips.enabled = false;
}
},
afterDraw: function (chart, easing) {
if (chart.config.options.showAllTooltips) {
// we don't want the permanent tooltips to animate, so don't do anything till the animation runs atleast once
if (!chart.allTooltipsOnce) {
if (easing !== 1)
return;
chart.allTooltipsOnce = true;
}
// turn on tooltips
chart.options.tooltips.enabled = true;
Chart.helpers.each(chart.pluginTooltips, function (tooltip) {
tooltip.initialize();
tooltip._options.position = "outer";
tooltip._options.displayColors = false;
tooltip._options.bodyFontSize = tooltip._chart.height*0.025;
tooltip._options.yPadding = tooltip._options.bodyFontSize*0.30;
tooltip._options.xPadding = tooltip._options.bodyFontSize*0.30;
tooltip._options.caretSize = tooltip._options.bodyFontSize*0.5;
tooltip._options.cornerRadius = tooltip._options.bodyFontSize*0.50;
tooltip.update();
// we don't actually need this since we are not animating tooltips
tooltip.pivot();
tooltip.transition(easing).draw();
});
chart.options.tooltips.enabled = false;
}
}
});