Gantt Chart SpreadsheetGear API Sample

// Create a new workbook and get a reference to the active worksheet, window info, 
// and cells.
SpreadsheetGear.IWorkbook workbook = SpreadsheetGear.Factory.GetWorkbook();
SpreadsheetGear.IWorksheet worksheet = workbook.ActiveWorksheet;
SpreadsheetGear.IWorksheetWindowInfo windowInfo = worksheet.WindowInfo;
SpreadsheetGear.IRange cells = worksheet.Cells;

// Load category labels using multiple cell text reference and iteration.
int task = 1;
foreach (SpreadsheetGear.IRange cell in cells["G2:G7"])
    cell.Formula = "Task " + task++;

// Start with zero and use formulas to calculate each additional start value.
cells["H2"].Formula = "0";
cells["H3:H7"].Formula = "=H2+I2";

// Load random duration values
cells["I2:I7"].Formula = "=INT(RAND() * 10) + 2";

// Add a chart to the worksheet's shape collection.
// NOTE: Calculate the coordinates of the chart by converting row and column
//       coordinates to points.  Use fractional row and column values to get 
//       coordinates anywhere in between row and column boundaries.
double left = windowInfo.ColumnToPoints(0.15);
double top = windowInfo.RowToPoints(0.5);
double right = windowInfo.ColumnToPoints(5.85);
double bottom = windowInfo.RowToPoints(13.5);
SpreadsheetGear.Charts.IChart chart =
    worksheet.Shapes.AddChart(left, top, right - left, bottom - top).Chart;

// Set the chart's source data range, plotting series in columns.
SpreadsheetGear.IRange source = cells["G2:I7"];
chart.SetSourceData(source, SpreadsheetGear.Charts.RowCol.Columns);

// Set the chart type to stacked bar to simulate a gantt chart.
chart.ChartType = SpreadsheetGear.Charts.ChartType.BarStacked;

// Set the distance between bars as a percentage of the bar width.
chart.ChartGroups[0].GapWidth = 100;

// Hide the first (Start) series values by setting the fill to none.
chart.SeriesCollection[0].Format.Fill.Visible = false;

// Change the theme color of the second (Duration) series.
chart.SeriesCollection[1].Format.Fill.ForeColor.ThemeColor =
    SpreadsheetGear.Themes.ColorSchemeIndex.Accent4;

// Reverse the category axis so that values are shown top to bottom.
chart.Axes[SpreadsheetGear.Charts.AxisType.Category].ReversePlotOrder = true;

// Add a chart title and change the font size.
chart.HasTitle = true;
chart.ChartTitle.Text = "Estimated Days To Completion";
chart.ChartTitle.Font.Size = 12;

// Delete the legend.
chart.HasLegend = false;