<repositories>
    <repository>
        <id>conholdate-repo</id>
        <name>Conholdate Maven Repository</name>
        <url>https://repository.conholdate.com/repo/</url>
    </repository>
</repositories>
<dependency>
    <groupId>com.conholdate</groupId>
    <artifactId>conholdate-total</artifactId>
    <version>24.9</version>
    <type>pom</type>
</dependency>

GanttChartOptions options = new GanttChartOptions();
options.setTitle("Project Development Schedule");
options.setScale(GanttScale.DAYS);
options.setBarColor(GanttBarColor.BLUE);
options.setBarPattern(GanttBarPattern.SOLID);
options.setBarStyle(GanttBarStyle.RECTANGLE);
options.setEnableCaching(true);

GanttChart chart = new GanttChart(options);

chart.addTask("Requirement Analysis", toDate(2023, 10, 1), toDate(2023, 10, 5));
chart.addTask("Design", toDate(2023, 10, 6), toDate(2023, 10, 12));
chart.addTask("Implementation", toDate(2023, 10, 13), toDate(2023, 11, 5));
chart.addTask("Testing", toDate(2023, 11, 6), toDate(2023, 11, 20));
chart.addTask("Deployment", toDate(2023, 11, 21), toDate(2023, 11, 22));

chart.save("output/gantt_chart.pdf", SaveFormat.PDF);

chart.dispose();

import com.groupdocs.chart.GanttChart;
import com.groupdocs.chart.options.GanttChartOptions;
import com.groupdocs.chart.enums.GanttScale;
import com.groupdocs.chart.enums.GanttBarColor;
import com.groupdocs.chart.enums.GanttBarPattern;
import com.groupdocs.chart.enums.GanttBarStyle;
import com.groupdocs.chart.enums.SaveFormat;
import java.time.LocalDate;
import java.time.ZoneId;
import java.util.Date;

public class GanttChartDemo {
    public static void main(String[] args) {
        // Configure chart appearance and timeline scale
        GanttChartOptions options = new GanttChartOptions();
        options.setTitle("Project Development Schedule");
        options.setScale(GanttScale.DAYS);               // timeline scale
        options.setBarColor(GanttBarColor.BLUE);         // default bar color
        options.setBarPattern(GanttBarPattern.SOLID);    // bar fill pattern
        options.setBarStyle(GanttBarStyle.RECTANGLE);    // bar shape
        options.setEnableCaching(true);                  // performance for large charts

// Create the Gantt chart with the defined options
        GanttChart chart = new GanttChart(options);

// Populate chart with tasks (dynamic data source can be used similarly)
        chart.addTask("Requirement Analysis", toDate(2023, 10, 1), toDate(2023, 10, 5));
        chart.addTask("Design", toDate(2023, 10, 6), toDate(2023, 10, 12));
        chart.addTask("Implementation", toDate(2023, 10, 13), toDate(2023, 11, 5));
        chart.addTask("Testing", toDate(2023, 11, 6), toDate(2023, 11, 20));
        chart.addTask("Deployment", toDate(2023, 11, 21), toDate(2023, 11, 22));

// Export the Gantt chart to PDF (other formats like PNG, JPEG are also supported)
        chart.save("output/gantt_chart.pdf", SaveFormat.PDF);

// Release resources
        chart.dispose();
    }

// Helper method to convert year/month/day to java.util.Date
    private static Date toDate(int year, int month, int day) {
        return Date.from(
                LocalDate.of(year, month, day)
                        .atStartOfDay(ZoneId.systemDefault())
                        .toInstant()
        );
    }
}