Establishing a minimum width for the value of zero in AmCharts column series by customizing the bullet labels

Here's an interesting example where I have arranged column series with bullet labels. However, you may notice that there are some 0 values present as well. My goal is to establish a minimum width for the series so that even if the value is small or 0, the bullet label remains visible.

For instance, take a look at the series for the year 2017, which starts with a 0. Unfortunately, the label is not fully visible in this case.

/**
 * ---------------------------------------
 * This demonstration was crafted using amCharts 4.
 * 
 * For more details, please visit:
 * https://www.amcharts.com/
 * 
 * Comprehensive documentation can be found at:
 * https://www.amcharts.com/docs/v4/
 * ---------------------------------------
 */

// Initializing themes
am4core.useTheme(am4themes_animated);
// Theme settings complete

// Generating chart instance
var chart = am4core.create("chartdiv", am4charts.XYChart);

// Adding data
chart.data = [{
  "year": "2016",
  "europe": 1.5,
  "namerica": 1.5,
  "asia": 1.3,
  "lamerica": 0.3,
  "meast": 0.2,
  "africa": 0
}, {
  "year": "2017",
  "europe": 0,
  "namerica": 1.8,
  "asia": 1.4,
  "lamerica": 0.3,
  "meast": 0.3,
  "africa": 0.1
}, {
  "year": "2018",
  "europe": 1.9,
  "namerica": 2.0,
  "asia": 0,
  "lamerica": 0.4,
  "meast": 0.3,
  "africa": 0.1
}];

chart.legend = new am4charts.Legend();
chart.legend.position = "right";

// Establishing axes
var categoryAxis = chart.yAxes.push(new am4charts.CategoryAxis());
categoryAxis.dataFields.category = "year";
categoryAxis.renderer.grid.template.opacity = 0;

var valueAxis = chart.xAxes.push(new am4charts.ValueAxis());
valueAxis.min = 0;
valueAxis.renderer.grid.template.opacity = 0;
valueAxis.renderer.ticks.template.strokeOpacity = 0.5;
valueAxis.renderer.ticks.template.stroke = am4core.color("#495C43");
valueAxis.renderer.ticks.template.length = 10;
valueAxis.renderer.line.strokeOpacity = 0.5;
valueAxis.renderer.baseGrid.disabled = true;
valueAxis.renderer.minGridDistance = 40;

// Creating series
function createSeries(field, name) {
  var series = chart.series.push(new am4charts.ColumnSeries());
  series.dataFields.valueX = field;
  series.dataFields.categoryY = "year";
  series.stacked = true;
  series.name = name;
  
  series.minWidth = `100px`;
  
  var labelBullet = series.bullets.push(new am4charts.LabelBullet());
  labelBullet.locationX = 0.5;
  labelBullet.label.text = "{valueX}";
  labelBullet.label.fill = am4core.color("#fff");
}

createSeries("europe", "Europe");
createSeries("namerica", "North America");
createSeries("asia", "Asia");
createSeries("lamerica", "Latin America");
createSeries("meast", "Middle East");
createSeries("africa", "Africa");

chart.legend.position = 'bottom';
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

#chartdiv {
  width: 100%;
  height: 500px;
}
<script src="https://cdn.amcharts.com/lib/4/core.js"></script>
<script src="https://cdn.amcharts.com/lib/4/charts.js"></script>
<script src="https://cdn.amcharts.com/lib/4/themes/animated.js"></script>
<div id="chartdiv"></div>

javascriptchartsamchartsamcharts4

Answer №1

It's not possible to set a minimum width/height for columns in a chart because the size is determined by the data, and forcing a minimum size could distort the values.

A more effective approach is to hide labels that are too large by using hideOversized with label bullets and utilize tooltips along with a chart cursor for better data representation.

am4core.useTheme(am4themes_animated);

var chart = am4core.create("chartdiv", am4charts.XYChart);

// Adding sample data
chart.data = [{
  "year": "2016",
  "europe": 1.5,
  "namerica": 1.5,
  "asia": 1.1,
  "lamerica": 0.3,
  "meast": 0.2,
  "africa": 0
}, {
  "year": "2017",
  "europe": 0,
  "namerica": 1.7,
  "asia": 1.2,
  "lamerica": 0.3,
  "meast": 0.3,
  "africa": 0.1
}, {
  "year": "2018",
  "europe": 1.8,
  "namerica": 1.9,
  "asia": 0,
  "lamerica": 0.3,
  "meast": 0.3,
  "africa": 0.1
}];

chart.legend = new am4charts.Legend();
chart.legend.position = "right";

// Setting up axes
var categoryAxis = chart.yAxes.push(new am4charts.CategoryAxis());
categoryAxis.dataFields.category = "year";
categoryAxis.renderer.grid.template.opacity = 0;

var valueAxis = chart.xAxes.push(new am4charts.ValueAxis());
valueAxis.min = 0;
valueAxis.renderer.grid.template.opacity = 0;
valueAxis.renderer.ticks.template.strokeOpacity = 0.5;
valueAxis.renderer.ticks.template.stroke = am4core.color("#495C43");
valueAxis.renderer.ticks.template.length = 10;
valueAxis.renderer.line.strokeOpacity = 0.5;
valueAxis.renderer.baseGrid.disabled = true;
valueAxis.renderer.minGridDistance = 40;

// Creating series
function createSeries(field, name) {
  var series = chart.series.push(new am4charts.ColumnSeries());
  series.dataFields.valueX = field;
  series.dataFields.categoryY = "year";
  series.stacked = true;
  series.name = name;
  series.tooltipText = "{name}: {valueX}";
  
  var labelBullet = series.bullets.push(new am4charts.LabelBullet());
  labelBullet.label.hideOversized = true;
  labelBullet.locationX = 0.5;
  labelBullet.label.text = "{valueX}";
  labelBullet.label.fill = am4core.color("#fff");
}

createSeries("europe", "Europe");
createSeries("namerica", "North America");
createSeries("asia", "Asia");
createSeries("lamerica", "Latin America");
createSeries("meast", "Middle East");
createSeries("africa", "Africa");

chart.legend.position = 'bottom';
chart.cursor = new am4charts.XYCursor();
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

#chartdiv {
  width: 100%;
  height: 500px;
}
<script src="https://cdn.amcharts.com/lib/4/core.js"></script>
<script src="https://cdn.amcharts.com/lib/4/charts.js"></script>
<script src="https://cdn.amcharts.com/lib/4/themes/animated.js"></script>
<div id="chartdiv"></div>

Answer №2

Here is an alternative solution that offers a fresh perspective or you might want to consider adjusting the label positioning.

/**
 * ---------------------------------------
 * This code snippet demonstrates the usage of amCharts 4 library.
 * 
 * For detailed information, please visit:
 * https://www.amcharts.com/
 * 
 * Check out the documentation at:
 * https://www.amcharts.com/docs/v4/
 * ---------------------------------------
 */

// Themes initialization
am4core.useTheme(am4themes_animated);
// End of themes

// Initialize chart
var chart = am4core.create("chartdiv", am4charts.XYChart);

// Populate data
chart.data = [{
  "year": "2016",
  "europe": 1.5,
  "namerica": 1.5,
  "asia": 1.1,
  "lamerica": 0.3,
  "meast": 0.2,
  "africa": 0
}, {
  "year": "2017",
  "europe": 0,
  "namerica": 1.7,
  "asia": 1.2,
  "lamerica": 0.3,
  "meast": 0.3,
  "africa": 0.1
}, {
  "year": "2018",
  "europe": 1.8,
  "namerica": 1.9,
  "asia": 0,
  "lamerica": 0.3,
  "meast": 0.3,
  "africa": 0.1
}];

chart.legend = new am4charts.Legend();
chart.legend.position = "right";

// Set up axes
var categoryAxis = chart.yAxes.push(new am4charts.CategoryAxis());
categoryAxis.dataFields.category = "year";
categoryAxis.renderer.grid.template.opacity = 0;

var valueAxis = chart.xAxes.push(new am4charts.ValueAxis());
valueAxis.min = 0;
valueAxis.renderer.grid.template.opacity = 0;
valueAxis.renderer.ticks.template.strokeOpacity = 0.5;
valueAxis.renderer.ticks.template.stroke = am4core.color("#495C43");
valueAxis.renderer.ticks.template.length = 10;
valueAxis.renderer.line.strokeOpacity = 0.5;
valueAxis.renderer.baseGrid.disabled = true;
valueAxis.renderer.minGridDistance = 40;

// Create series function
function createSeries(field, name) {
  var series = chart.series.push(new am4charts.ColumnSeries());
  series.dataFields.valueX = field;
  series.dataFields.categoryY = "year";
  series.stacked = true;
  series.name = name;
  
  series.minWidth = `100px`;
  
  var labelBullet = series.bullets.push(new am4charts.LabelBullet());
  labelBullet.locationX = 0.5;
  labelBullet.label.text = "{valueX}";
  labelBullet.label.fill = am4core.color("#fff");
  labelBullet.label.x= 4;
}

createSeries("europe", "Europe");
createSeries("namerica", "North America");
createSeries("asia", "Asia");
createSeries("lamerica", "Latin America");
createSeries("meast", "Middle East");
createSeries("africa", "Africa");

chart.legend.position = 'bottom';
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI, Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

#chartdiv {
  width: 100%;
  height: 500px;
}
<script src="https://cdn.amcharts.com/lib/4/core.js"></script>
<script src="https://cdn.amcharts.com/lib/4/charts.js"></script>
<script src="https://cdn.amcharts.com/lib/4/themes/animated.js"></script>
<div id="chartdiv"></div>

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