Inhalt:

- Optimale Datenstruktur
- Beispiel: Füllen der Daten

Optimale Datenstruktur (Datenbank)

Kategory	Wert
Bverages	393
Condiments	507
Confections	386

Optimale Objektstruktur (Java)

public class PieChartObject {
	private String category;
	private Integer value;

	public String getCategory() {
		return this.category;
	}

	public void setCategory(final String category) {
		this.category = category;
	}

	public Integer getValue() {
		return this.value;
	}

	public void setValue(final Integer value) {
		this.value = value;
	}
}

Beispiel: Füllen der Daten

final ChartModel model = ChartModel.New()
	.addColumn(Column.New(Type.STRING))
	.addColumn(Column.New(Type.NUMBER));

model.addRow("Katze", 50);
model.addRow("Hund", 25);
model.addRow("Schlange", 25);

this.pieChart.setModel(model);

oder per Schleife aus Query-Methode:

final ChartModel model = ChartModel.New()
	.addColumn(Column.New(Type.STRING))
	.addColumn(Column.New(Type.NUMBER));

new ProductDAO().getProductsByCategoryForChart().forEach(p -> {
       model.addRow(p.getCategory().getCategoryname(), (int)p.getAmount());
});

chart.setModel(model);

API und Methoden:

Konfiguration "XdevPieChartConfig" allgemein:

Properties
PieHole	If between 0 and 1, displays a donut chart. The hole with have a radius equal to `number` times the radius of the chart. pieChart.setPieHole(0.5);
PieStartAngle	The angle, in degrees, to rotate the chart by. The default of `0` will orient the leftmost edge of the first slice directly up. pieChart.setPieStartAngle(60);
PieSliceBorderColor	The color of the slice borders. Only applicable when the chart is two-dimensional. pieChart.setPieSliceBorderColor("red");
PieSliceText	The content of the text displayed on the slice. Can be one of the following: 'percentage' - The percentage of the slice size out of the total. 'value' - The quantitative value of the slice. 'label' - The name of the slice. 'none' - No text is displayed pieChart.setPieSliceText(PieSliceText.PERCENTAGE);
SliceVisibilityThreshold	The fractional value of the pie, below which a slice will not show individually. All slices that have not passed this threshold will be combined to a single "Other" slice, whose size is the sum of all their sizes. Default is not to show individually any slice which is smaller than half a degree. pieChart.setSliceVisibilityThreshold(25);
Is3D	If true, displays a three-dimensional chart. pieChart.setIs3D(true);