如何控制plotly.js中迹线的显示顺序？

Question

我显示了大量跟踪线。通常为 50-200。我正在将历史数据与模拟数据进行比较。我想通过不同颜色的选择来突出显示单个模拟跟踪线。所有这些都很好用。

但是，显示的跟踪线有时会被大量其他线隐藏。除了重新绘制整个绘图并最后添加该行之外，是否有方法强制将指定的迹线绘制在其他迹线之上？某种 z-index 等效项或“置于前面”机制？

Answer 1

也许这对其他 Plotly 用户也有用。该代码片段使用 Plotly 的

react

函数将迹线 7 推送到前台。

var foreground = 7; //trace which is pushed to the foreground

//generate some random data
var trace1 = {
  x: [1, 2, 3, 4],
  y: [1, 2, 0.5, 1.5],
  type: 'lines',
  name: 'trace 0',
  line: {
width: 2
  }
};

var data = [trace1];
var i = 0;
var j = 0;
for (i = 1; i < 10; i += 1) {
  var trace = {
x: [],
y: [],
type: 'lines',
name: 'trace ' + i,
'line': {
  'width': 2
}
  };
  for (j = 0; j < trace1.x.length; j += 1) {
trace.x.push(trace1.x[j])
trace.y.push(trace1.y[j] + Math.random())
  }
  data.push(trace);
}

var buttonForeground = document.getElementById("foreground");
var buttonReset = document.getElementById("reset");

var div = document.getElementById('myDiv');
Plotly.newPlot(div, data);

buttonReset.disabled = true;
buttonForeground.onclick = function() {
  var temp = data[foreground];
  data[foreground] = data[data.length - 1];
  data[data.length - 1] = temp;
  data[data.length - 1]['line']['width'] = 5;
  Plotly.react(div, data);

  switchButtons();
};

document.getElementById("reset").onclick = function() {
  var temp = data[data.length - 1];
  data[data.length - 1] = data[foreground];
  data[foreground] = temp;
  data[foreground]['line']['width'] = 2;
  Plotly.react(div, data, {});
  
  switchButtons();
};

function switchButtons() {
  buttonForeground.disabled = !buttonForeground.disabled;
  buttonReset.disabled = !buttonReset.disabled;
}

<script src="https://cdn.plot.ly/plotly-latest.min.js"></script>
<div id="myDiv" style="width: 480px; height: 400px;"></div>
<button type="button" id='foreground'>Foreground</button>
<button type="button" id='reset'>Reset</button>

Answer 2

我在数据数组的末尾有顶部迹线，但它仍然没有出现在顶部。

事实证明，它的类型与其他类型不同，而且似乎优先考虑

scattergl

而不是默认类型。因此，当我将数据中所有对象的类型更改为

scattergl

时，最终遵循了数据数组中的顺序。

之前的例子：

const data = [];

data.push({
  x: [0, 1, ...],
  y: [43, 100, ...],
  ids: ["first", "second", ...],
  type: "scattergl",
  mode: "markers",
  marker: {opacity: 1, color: "green", size: 8},
  showlegend: false,
  name: "",
});

// Highlight quake
data.push({
  x: [10],
  y: [55],
  ids: ["selected"],
  mode: "markers",
  marker: {opacity: 1, color: "green", size: 8},
  showlegend: false,
  name: "",
});

修复后：

// Highlight quake
data.push({
  x: [10],
  y: [55],
  ids: ["selected"],
  type: "scattergl", // <---- add this
  mode: "markers",
  marker: {opacity: 1, color: "green", size: 8},
  showlegend: false,
  name: "",
});