Google Chart - negative/positive values annotation

2019-05-23 01:30发布

站内文章 / JavaScript
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问题:

I've got the following column chart and I'd like to position annotations for positive values above and for negative ones bellow columns. How to do that?

Additional question for values and annotation formatting - how to achieve the formatting of annotations (values above and bellow columns) like vAxis?

google.charts.load('current',{callback:drawChart,'packages':['corechart'],'language':'hr'});

function drawChart()
{
  var data = new google.visualization.DataTable();
  data.addColumn('date','Datum');
  data.addColumn('number','Vrijednost');
  data.addColumn('number','Pred. prema preth. 5 dana');
  data.addColumn('number','Pred. prema preth. 10 dana');
  data.addColumn('number','Relativna promjena');
  data.addRows([
  [new Date('2017-08-03'),12.10260,12.09797,12.148753333333,0.3199602122016],
  [new Date('2017-08-02'),12.06400,12.16005,12.176186666667,-0.69882870054079],
  [new Date('2017-08-01'),12.14890,12.12988,12.160606666667,0.3129386508133],
  [new Date('2017-07-31'),12.11100,12.13091,12.14988,-0.001651364026678],
  [new Date('2017-07-28'),12.11120,12.1175,12.116093333333,0.11821210392746],
  [new Date('2017-07-27'),12.09690,12.10942,12.079293333333,0.24113757271416],
  [new Date('2017-07-26'),12.06780,12.10184,12.040733333333,0],
  [new Date('2017-07-25'),12.06780,12.06525,11.992986666667,0.28753781205331],
  [new Date('2017-07-24'),12.03320,12.02595,11.95908,0.18983547592086],
  [new Date('2017-07-21'),12.01040,11.95357,11.932006666667,0.41468798073707],
  [new Date('2017-07-20'),11.96080,11.9183,11.9194,0.1951832460733],
  [new Date('2017-07-19'),11.93750,11.89151,11.914186666667,0.21154604904174],
  [new Date('2017-07-18'),11.91230,11.89439,11.937766666667,0.1235543302851],
  [new Date('2017-07-17'),11.89760,11.93811,11.967046666667,-0.36595680537295],
  [new Date('2017-07-14'),11.94130,11.95136,11.972373333333,0.068716427416171],
  [new Date('2017-07-13'),11.93310,11.96335,11.975713333333,-0.1848567987152],
  [new Date('2017-07-12'),11.95520,11.94968,11.96142,-0.070212979370754],
  [new Date('2017-07-11'),11.96360,11.95871,11.944226666667,0.19429834846403],
  [new Date('2017-07-10'),11.94040,11.9698,11.93224,0.099761076413629],
  [new Date('2017-07-07'),11.92850,11.96977,11.934313333333,-0.13478894228354],
  [new Date('2017-07-06'),11.94460,11.93426,11.931026666667,-0.10036297944233],
  [new Date('2017-07-05'),11.95660,11.86036,11.91198,0.66342251932174],
  [new Date('2017-07-04'),11.87780,11.86771,11.918093333333,0.048011724968622],
  [new Date('2017-07-03'),11.87210,11.88418,11.919446666667,-0.078273604120727],
  [new Date('2017-06-30'),11.88140,11.92094,11.907506666667,-0.076531684958581]
  ]);

  var ColumnOpt = {
    height: 300,
    title: 'Relativna promjena vrijednosti [%]',
    annotations: {textStyle: {fontName: 'Tahoma', fontSize: 9}},
    vAxis: {textStyle: {fontName: 'Tahoma', fontSize: 9}, format: "#.#'%'",
    viewWindow: {min: data.getColumnRange(4).min-0.5}},
    hAxis: {textStyle: {fontName: 'Tahoma', fontSize: 9}, showTextEvery: 5},
    chartArea: {width: '80%', height: '80%'},
    legend: {position: 'none'},
    colors: ['purple']
  };
  
  var view2 = new google.visualization.DataView(data);
  view2.setColumns([0,4,{calc:'stringify',sourceColumn:4,type:'string',role:'annotation'}]);

  var container = document.getElementById('Chart2');
  var chart2=new google.visualization.ColumnChart(container);

  var observer = new MutationObserver(function () {
    $.each($('text[text-anchor="start"]'), function (index, label) {
      var labelValue = parseFloat($(label).text());
      if (labelValue < 0 && $(label).attr('font-height') !== 'bold') {
        var bounds = label.getBBox();
        var chartLayout = container.getChartLayoutInterface();
        $(label).attr('y',chartLayout.getYLocation(labelValue) - bounds.height - 8);
      }
    });
  });
  observer.observe(container,{childList: true,subtree: true});

  chart2.draw(view2,ColumnOpt);
}
<div id="Chart2"></div>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://www.gstatic.com/charts/loader.js"></script>

回答1:

several issues to deal with here

on this chart, the annotations have attribute --> text-anchor="middle"
vs. text-anchor="start" on the other

to format the annotations, use a number formatter 

  var formatAnnotation = new google.visualization.NumberFormat({
    pattern: ColumnOpt.vAxis.format
  });

use a custom function on the view, vs. predefined "stringify" function 

var view2 = new google.visualization.DataView(data);
view2.setColumns([0,4,{
  calc: function (dt, row) {
    return formatAnnotation.formatValue(dt.getValue(row, 4));
  },
  type: 'string',
  role: 'annotation'
}]);

this poses a problem with commas in the number
need to replace with decimal for parseFloat to handle ok

there is also an issue with annotations overlapping

but this snippet should get you closer... 

google.charts.load('current',{callback:drawChart,'packages':['corechart'],'language':'hr'});

function drawChart()
{
  var data = new google.visualization.DataTable();
  data.addColumn('date','Datum');
  data.addColumn('number','Vrijednost');
  data.addColumn('number','Pred. prema preth. 5 dana');
  data.addColumn('number','Pred. prema preth. 10 dana');
  data.addColumn('number','Relativna promjena');
  data.addRows([
  [new Date('2017-08-03'),12.10260,12.09797,12.148753333333,0.3199602122016],
  [new Date('2017-08-02'),12.06400,12.16005,12.176186666667,-0.69882870054079],
  [new Date('2017-08-01'),12.14890,12.12988,12.160606666667,0.3129386508133],
  [new Date('2017-07-31'),12.11100,12.13091,12.14988,-0.001651364026678],
  [new Date('2017-07-28'),12.11120,12.1175,12.116093333333,0.11821210392746],
  [new Date('2017-07-27'),12.09690,12.10942,12.079293333333,0.24113757271416],
  [new Date('2017-07-26'),12.06780,12.10184,12.040733333333,0],
  [new Date('2017-07-25'),12.06780,12.06525,11.992986666667,0.28753781205331],
  [new Date('2017-07-24'),12.03320,12.02595,11.95908,0.18983547592086],
  [new Date('2017-07-21'),12.01040,11.95357,11.932006666667,0.41468798073707],
  [new Date('2017-07-20'),11.96080,11.9183,11.9194,0.1951832460733],
  [new Date('2017-07-19'),11.93750,11.89151,11.914186666667,0.21154604904174],
  [new Date('2017-07-18'),11.91230,11.89439,11.937766666667,0.1235543302851],
  [new Date('2017-07-17'),11.89760,11.93811,11.967046666667,-0.36595680537295],
  [new Date('2017-07-14'),11.94130,11.95136,11.972373333333,0.068716427416171],
  [new Date('2017-07-13'),11.93310,11.96335,11.975713333333,-0.1848567987152],
  [new Date('2017-07-12'),11.95520,11.94968,11.96142,-0.070212979370754],
  [new Date('2017-07-11'),11.96360,11.95871,11.944226666667,0.19429834846403],
  [new Date('2017-07-10'),11.94040,11.9698,11.93224,0.099761076413629],
  [new Date('2017-07-07'),11.92850,11.96977,11.934313333333,-0.13478894228354],
  [new Date('2017-07-06'),11.94460,11.93426,11.931026666667,-0.10036297944233],
  [new Date('2017-07-05'),11.95660,11.86036,11.91198,0.66342251932174],
  [new Date('2017-07-04'),11.87780,11.86771,11.918093333333,0.048011724968622],
  [new Date('2017-07-03'),11.87210,11.88418,11.919446666667,-0.078273604120727],
  [new Date('2017-06-30'),11.88140,11.92094,11.907506666667,-0.076531684958581]
  ]);

  var ColumnOpt = {
    height: 300,
    title: 'Relativna promjena vrijednosti [%]',
    annotations: {alwaysOutside: true, textStyle: {fontName: 'Tahoma', fontSize: 9}, stem: {length: 4, color: 'transparent'}},
    vAxis: {textStyle: {fontName: 'Tahoma', fontSize: 9}, format: "#.#'%'",
    viewWindow: {min: data.getColumnRange(4).min-0.5}},
    hAxis: {textStyle: {fontName: 'Tahoma', fontSize: 9}, showTextEvery: 5},
    chartArea: {width: '80%', height: '80%'},
    legend: {position: 'none'},
    colors: ['purple']
  };

  var formatAnnotation = new google.visualization.NumberFormat({
    pattern: ColumnOpt.vAxis.format
  });

  var view2 = new google.visualization.DataView(data);
  view2.setColumns([0,4,{
    calc: function (dt, row) {
      return formatAnnotation.formatValue(dt.getValue(row, 4));
    },
    type: 'string',
    role: 'annotation'
  }]);
  
  var container = document.getElementById('Chart2');
  var chart2=new google.visualization.ColumnChart(container);

  var observer = new MutationObserver(function () {
    $.each($('text[text-anchor="middle"]'), function (index, label) {
      var labelValue = parseFloat($(label).text().replace(',', '.'));
      if (labelValue < 0 && $(label).attr('fill') === '#800080') {
        var bounds = label.getBBox();
        var chartLayout = chart2.getChartLayoutInterface();
        $(label).attr('y',chartLayout.getYLocation(labelValue) + bounds.height);
      }
    });
  });
  observer.observe(container,{childList: true,subtree: true});

  chart2.draw(view2,ColumnOpt);
}
<div id="Chart2"></div>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://www.gstatic.com/charts/loader.js"></script>



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