如何计算点击甜甜圈元素的中点与负y轴之间的角度 [英] how to calculate the angle between the mid of a clicked donut element and the negative y-axis
本文介绍了如何计算点击甜甜圈元素的中点与负y轴之间的角度的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
,现在当我点击甜甜圈时添加了'图像'类,我想动态添加'图像'类中的度数,以便点击的项目在底部朝下(如'
Consider the following codesample donut chart using jquery-flot , now as i have added the 'image' class on click of the donut, i want to dynamically add the degree in the 'image' class so that the clicked item will be facing down at the bottom ( like on the -ve side of the y-axis ).`
var data = [{
label: "Pause",
data: 150
}, {
label: "No Pause",
data: 100
}, {
label: "yes Pause",
data: 80
}, {
label: "Sleeping",
data: 250
}];
var options = {
series: {
pie: {
show: true,
innerRadius: 0.5,
radius: 1,
startAngle: 1,
}
},
grid: {
hoverable: true,
clickable: true
},
legend: {
show: false
},
stroke: {
width: 4
},
tooltip: true,
tooltipOpts: {
cssClass: "flotTip",
content: "%s: %p.0%",
defaultTheme: false
}
};
$("#pie-placeholder").bind("plotclick", function(event, pos, obj) {
$("#pie-placeholder").addClass('image')
});
var plot = $.plot($("#pie-placeholder"), data, options);
`
注意: - 这是使用Jquery flot完成
Note:- this is done using Jquery flot
推荐答案
这里如果我找对了,你可以找到我的解决方案。
Here you can find my solution to your problem if I got you right.
$("#pie-placeholder").bind("plotclick", function(event, pos, obj) {
if (obj) {
var percentInRads = 0.02;
var currSegmentInRads = percentInRads * obj.datapoint[0]
var currSegmentOffset = currSegmentInRads / 2;
var currSegmentStart = currSegmentOffset >= 0.5 ? -0.5 + currSegmentOffset : 0.5 - currSegmentOffset;
var total = 0;
var beforeTotal = 0;
for (var idx = 0; idx < data.length; idx++) {
var segment = data[idx];
if (idx < obj.seriesIndex) {
beforeTotal += segment.data;
}
total += segment.data;
}
var beforePart = (beforeTotal / total * 100) * percentInRads;
var chartStartAngle = currSegmentStart - beforePart;
options.series.pie.startAngle = chartStartAngle;
$.plot($("#pie-placeholder"), data, options);
console.log(obj.series);
}
});
这篇关于如何计算点击甜甜圈元素的中点与负y轴之间的角度的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文