D3.js 围绕中点旋转轴标签 [英] D3.js rotate axis labels around the middle point
问题描述
我现在正在使用 D3.js,尽管我发现了非常相似的案例,但我真的无法将它们放在一起继续前进.
I am working with D3.js now and even though I found very similar cases I am not really able to put them together and move on.
我有一些类似于雷达图的东西,我想附加到我创建的每个轴(轴的数量不固定可能是 4,但也可以是 40)文本,我已经有了,但是围绕中心旋转文本一旦它们达到 180 度,实际上是 0 度,就指向并转动它们.
I have something similar as a radar chart and I would like to append to each ax I create (number of axes is not fixed could be 4, but also 40) text, which I already have, but rotate the text around center point and turn them as soon as they reach 180 degrees, actually 0 degrees.
结果应该是这样的:
我现在拥有的是:
我只知道如何在 arc
内达到它,这也很好地显示了 在这里,但我并没有真正弄清楚我的情况.
I only know how to reach this within arc
, which is also nicely shown here, but I did not really figure it out for my case.
这是我的代码片段,我在其中附加了这些文本条件:
This is my code snippet, where I append those text criteria:
//Write criterias
axis.append("text")
.attr("class","labels")
.attr("font-size","12px")
.attr("font-family","Montserrat")
.attr("text-anchor","middle")
.attr("fill","white")
.attr("x",function (d, i) {
return radius * Math.cos(angleSlice * i - Math.PI/2)*options.circles.labelFactor;
})
.attr("y",function (d, i) {
return radius * Math.sin(angleSlice * i - Math.PI/2)*options.circles.labelFactor;
})
.text(function (d) {
return d;
});
这是我的小提琴:https://jsfiddle.net/fsb47ndf/
感谢您的建议
推荐答案
有些人觉得旋转 SVG 元素很困难,因为 transform
属性的 rotate
函数围绕原点 (0,0) 旋转元素,而不是围绕其中心:
Some people find it difficult to rotate an SVG element, because the rotate
function of the transform
attribute rotates the element around the origin (0,0), not around its center:
如果可选参数未提供,则旋转关于当前用户坐标系的原点(来源)
If optional parameters and are not supplied, the rotate is about the origin of the current user coordinate system (source)
因此,一个简单的选择是删除文本的 x
和 y
属性,并使用 transform
定位它们.这样,我们就可以轻松计算旋转:
Thus, an easy option is dropping the x
and the y
attributes of the texts, and positioning them using transform
. That way, we can easily calculate the rotation:
.attr("transform", function(d, i) {
var rotate = angleSlice * i > Math.PI / 2 ?
(angleSlice * i * 180 / Math.PI) - 270 :
(angleSlice * i * 180 / Math.PI) - 90;
return "translate(" + radius * Math.cos(angleSlice * i - Math.PI / 2) * options.circles.labelFactor +
"," + radius * Math.sin(angleSlice * i - Math.PI / 2) * options.circles.labelFactor +
") rotate(" + rotate + ")"
})
这是您的代码:
data = [{
name: 'DATA1',
value: 22,
}, {
name: 'DATA2',
value: 50,
}, {
name: 'DATA3',
value: 0,
}, {
name: 'DATA4',
value: 24,
}, {
name: 'DATA5',
value: 22,
}, {
name: 'DATA6',
value: 30,
}, {
name: 'DATA7',
value: 20,
}, {
name: 'DATA8',
value: 41,
}, {
name: 'DATA9',
value: 31,
}, {
name: 'DATA10',
value: 30,
}, {
name: 'DATA11',
value: 30,
}, {
name: 'DATA12',
value: 30,
}, {
name: 'DATA13',
value: 30,
}, {
name: 'DATA14',
value: 30,
}, ];
var options = {
width: 600,
height: 600,
margins: {
top: 100,
right: 100,
bottom: 100,
left: 100
},
circles: {
levels: 6,
maxValue: 100,
labelFactor: 1.15,
opacity: 0.2,
},
};
var allAxis = (data.map(function(i, j) {
return i.name
})),
total = allAxis.length,
radius = Math.min(options.width / 2, options.height / 2),
angleSlice = Math.PI * 2 / total,
Format = d3.format('');
var rScale = d3.scale.linear()
.domain([0, options.circles.maxValue])
.range([50, radius]);
var svg = d3.select("body").append("svg")
.attr("width", options.width + options.margins.left + options.margins.right)
.attr("height", options.height + options.margins.top + options.margins.bottom);
var g = svg.append("g")
.attr("transform", "translate(" + (options.width / 2 + options.margins.left) + "," + (options.height / 2 + options.margins.top) + ")");
var axisGrid = g.append("g")
.attr("class", "axisWraper");
var axis = axisGrid.selectAll(".axis")
.data(allAxis)
.enter()
.append("g")
.attr("class", "axis")
//append them lines
axis.append("line")
.attr("x1", 0)
.attr("y1", 0)
.attr("x2", function(d, i) {
var tempX2 = radius * Math.cos(angleSlice * i - Math.PI / 2);
return tempX2;
})
.attr("y2", function(d, i) {
var tempY = radius * Math.sin(angleSlice * i - Math.PI / 2);
return tempY;
})
.attr("class", "line")
.attr("stroke", "black")
.attr("fill", "none");
//Draw background circles
axisGrid.selectAll(".levels")
.data([6, 5, 4, 3, 2, 1])
.enter()
.append("circle")
.attr("class", "gridCircle")
.attr("r", function(d, i) {
return parseInt(radius / options.circles.levels * d, 10);
})
.attr("stroke", "black")
.attr("fill-opacity", options.circles.opacity);
//Write data
axis.append("text")
.attr("class", "labels")
.attr("font-size", "12px")
.attr("font-family", "Montserrat")
.attr("text-anchor", "middle")
.attr("fill", "black")
.attr("transform", function(d, i) {
var rotate = angleSlice * i > Math.PI ? (angleSlice * i * 180 / Math.PI) - 270 : (angleSlice * i * 180 / Math.PI) - 90;
return "translate(" + radius * Math.cos(angleSlice * i - Math.PI / 2) * options.circles.labelFactor + "," + radius * Math.sin(angleSlice * i - Math.PI / 2) * options.circles.labelFactor + ") rotate(" + rotate + ")"
})
.text(function(d) {
return d;
});
<script src="https://d3js.org/d3.v3.min.js"></script>
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