Inhalt:

Daten- / Objektstruktur
Beispiel Füllen mit Daten
Properties

Optimale Datenstruktur (Datenbank):

Kategorie 1 - y-Achse	Kategorie - x-Achse	Beginn	Ende
Projekt 1	Aufgabe 1	28.04.2018	03.05.2018
Projekt 1	Aufgabe 2	01.05.2018	08.05.2018
Projekt 1	Aufgabe 3	06.05.2018	12.05.2018
Projekt 2	Aufgabe 1	28.04.2018	20.05.2018
Projekt 2	Aufgabe 2	06.05.2018	25.05.2018

Optimale Objektstruktur (Java):

public class TimelineChartObject {
	private String y_category;
	private String x_category;
	private LocalDate start;
	private LocalDate end;

	public String getX_category() {
		return x_category;
	}

	public void setX_category(String x_category) {
		this.x_category = x_category;
	}

	public String getY_category() {
		return y_category;
	}

	public void setY_category(String y_category) {
		this.y_category = y_category;
	}

	public LocalDate getStart() {
		return start;
	}

	public void setStart(LocalDate start) {
		this.start = start;
	}

	public LocalDate getEnd() {
		return end;
	}

	public void setEnd(LocalDate end) {
		this.end = end;
	}
}

Beispiel füllen der Daten:

//Erstellen Model
final ChartModel model = ChartModel.New()
	.addColumn(Column.New(Type.STRING, "project", "project"))
	.addColumn(Column.New(Type.STRING, "task", "Task"))
	.addColumn(Column.New(Type.DATE, "from", "From"))
	.addColumn(Column.New(Type.DATE, "to", "To"));

model.addRow("Project 1", "Aufgabe 1", LocalDate.of(2018, 4, 28), LocalDate.of(2018, 5, 3));
model.addRow("Project 1", "Aufgabe 2",LocalDate.of(2018, 5, 1), LocalDate.of(2018, 5, 8));
model.addRow("Project 1", "Aufgabe 3",LocalDate.of(2018, 5, 6), LocalDate.of(2018, 5, 12));
model.addRow("Project 2", "Aufgabe 1",LocalDate.of(2018, 4, 28), LocalDate.of(2018, 5, 20));
model.addRow("Project 2", "Aufgabe 2",LocalDate.of(2018, 5, 6), LocalDate.of(2018, 5, 25));
model.addRow("Project 2", "Aufgabe 3",LocalDate.of(2018, 5, 21), LocalDate.of(2018, 5, 28));
model.addRow("Project 2", "Aufgabe 4",LocalDate.of(2018, 6, 6), LocalDate.of(2018, 6, 12));
model.addRow("Project 3", "Aufgabe 1",LocalDate.of(2018, 6, 1), LocalDate.of(2018, 6, 10));
model.addRow("Project 4", "Aufgabe 1",LocalDate.of(2018, 5, 28), LocalDate.of(2018, 6, 6));

//Setzen des Models
timelineChart.setModel(model);

API und Methoden:

Properties
AvoidOverlappingGridlines	Google Charts makes tiny adjustments to bar endpoints to avoid obscuring timeline gridlines. To prevent this behavior, set the `avoidOverlappingGridLines` option to `false`. timelineChart.setAvoidOverlappingGridLines(true);
CustomizeTimeline	Example final Timeline timeline = Timeline.Builder() .showRowLabels(true) .colorByRowLabel(true) .groupByRowLabel(true) .build(); this.timelineChart.setTimeline(timeline); For more detailed informations see: https://developers.google.com/chart/interactive/docs/gallery/timeline