Question

有问题。使用plotly.js绘制散点图，我需要能够点击图表并检索点的值，以便我可以在点击的位置绘制新点。 plotly_click事件仅触发已创建的点。

我是如何获得点击事件以获取该位置的当前值以便我可以绘制新点的任何想法？

到目前为止，我只是得到了这个：

var trace1 = {
    x: [1, 2, 3, 4],
    y: [10, 15, 13, 17],
    mode: 'markers',
    type: 'scatter'
};

var trace2 = {
    x: [2, 3, 4, 5],
    y: [16, 5, 11, 9],
    mode: 'lines',
    type: 'scatter'
};

var trace3 = {
    x: [1, 2, 3, 4],
    y: [12, 9, 15, 12],
    mode: 'lines+markers',
    type: 'scatter'
};

var data = [trace1, trace2, trace3];

Plotly.newPlot('myDiv', data);

document.getElementById('myDiv').on('plotly_click', function(data){
    var pts = '';

    for(var i=0; i < data.points.length; i++){
        pts = 'x = ' + data.points[i].x +'\ny = ' + data.points[i].y.toPrecision(4) + '\n\n';
    }

    alert('Closest point clicked:\n\n'+pts);
});

https://codepen.io/mayasky76/pen/ZXRRMJ/

Answer 1

非常感谢Maximillian Peters的这个

现在有一个散点图，用于报告mousemove上的位置（xy）值，并在点击时绘制一个指向图表的点

<head>
  <!-- Plotly.js -->
   <script src="https://cdn.plot.ly/plotly-latest.min.js"></script>
</head>

<body>
  x :<input id="xvalue" size="5"  /> y :<input id="yvalue" size="5" /> 
 <div id="myPlot" style="width:100%;height:100%"></div>
  <script>
    <!-- JAVASCRIPT CODE GOES HERE -->
  </script>
</body>

的Javascript

var traces = [{
  x: [1, 2, 3, 4],
  y: [10, 15, 13, 17],
  mode: 'markers',
  type: 'scatter'
}];

traces.push({
  x: [2, 3, 4, 5],
  y: [16, 5, 11, 9],
  mode: 'markers',
  type: 'scatter'
});

traces.push({
  x: [1, 2, 3, 4],
  y: [12, 9, 15, 12],
  mode: 'markers',
  type: 'scatter'
});

traces.push({
  x: [],
  y: [],
  mode: 'markers',
  type: 'scatter'
});

var myPlot = document.getElementById('myPlot')
Plotly.newPlot('myPlot', traces, {hovermode: 'closest'});

Number.prototype.between = function(min, max) {
  return this >= min && this <= max;
};


Plotly.d3.select(".plotly").on('click', function(d, i) {
  var e = Plotly.d3.event;
  var bg = document.getElementsByClassName('bg')[0];
  var x = ((e.layerX - bg.attributes['x'].value + 4) / (bg.attributes['width'].value)) * (myPlot.layout.xaxis.range[1] - myPlot.layout.xaxis.range[0]) + myPlot.layout.xaxis.range[0];
  var y = ((e.layerY - bg.attributes['y'].value + 4) / (bg.attributes['height'].value)) * (myPlot.layout.yaxis.range[0] - myPlot.layout.yaxis.range[1]) + myPlot.layout.yaxis.range[1]
  if (x.between(myPlot.layout.xaxis.range[0], myPlot.layout.xaxis.range[1]) &&
    y.between(myPlot.layout.yaxis.range[0], myPlot.layout.yaxis.range[1])) {
    Plotly.extendTraces(myPlot, {
      x: [
        [x]
      ],
      y: [
        [y]
      ]
    }, [3]);
  }
});

Plotly.d3.select(".plotly").on('mousemove', function(d, i) {
  var e = Plotly.d3.event;
  var bg = document.getElementsByClassName('bg')[0];
  var x = ((e.layerX - bg.attributes['x'].value + 4) / (bg.attributes['width'].value)) * (myPlot.layout.xaxis.range[1] - myPlot.layout.xaxis.range[0]) + myPlot.layout.xaxis.range[0];
  var y = ((e.layerY - bg.attributes['y'].value + 4) / (bg.attributes['height'].value)) * (myPlot.layout.yaxis.range[0] - myPlot.layout.yaxis.range[1]) + myPlot.layout.yaxis.range[1]
  if (x.between(myPlot.layout.xaxis.range[0], myPlot.layout.xaxis.range[1]) &&
    y.between(myPlot.layout.yaxis.range[0], myPlot.layout.yaxis.range[1])) {
    console.log("Location X:"+x+" Y"+y)
   document.getElementById("xvalue").value = x;
   document.getElementById("yvalue").value = y;
  }
});

https://codepen.io/mayasky76/pen/ZXRRMJ

Plotly.js在点击时创建一个点

1 个答案: