Combination 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 some sample data.
cells["G3:G7"].Value =
    new string[,] { { "Mon" }, { "Tue" }, { "Wed" }, { "Thu" }, { "Fri" } };
cells["H2:K2"].Value =
    new string[,] { { "Breakfast", "Lunch", "Dinner", "Total" } };
cells["H3:J7"].Formula = "=INT(RAND() * 500) + 300";
cells["K3:K7"].Formula = "=SUM(H3:J3)";

// 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:K7"];
chart.SetSourceData(source, SpreadsheetGear.Charts.RowCol.Columns);

// Set the chart type to a 100% stacked column.
chart.ChartType = SpreadsheetGear.Charts.ChartType.ColumnStacked100;

// Get a reference to the chart's series collection and each series.
SpreadsheetGear.Charts.ISeriesCollection seriesCollection = chart.SeriesCollection;
SpreadsheetGear.Charts.ISeries seriesBreakfast = seriesCollection[0];
SpreadsheetGear.Charts.ISeries seriesLunch = seriesCollection[1];
SpreadsheetGear.Charts.ISeries seriesDinner = seriesCollection[2];
SpreadsheetGear.Charts.ISeries seriesTotal = seriesCollection[3];

// Change the last series chart type and plot it on the secondary axis. 
// NOTE: This creates a combination chart using multiple chart groups
//       and utilizes both primary and secondary axes sets, allowing for
//       disproportionate ranges of values to be plotted separately.
seriesTotal.ChartType = SpreadsheetGear.Charts.ChartType.Line;
seriesTotal.AxisGroup = SpreadsheetGear.Charts.AxisGroup.Secondary;

// Change the fill color of each primary series.
seriesBreakfast.Format.Fill.ForeColor.RGB = SpreadsheetGear.Colors.DarkOrange;
seriesLunch.Format.Fill.ForeColor.RGB = SpreadsheetGear.Colors.OrangeRed;
seriesDinner.Format.Fill.ForeColor.RGB = SpreadsheetGear.Colors.Red;

// Change the line color of the total series.
seriesTotal.Format.Line.ForeColor.RGB = SpreadsheetGear.Colors.Yellow;

// Add data labels to the total series and get a reference to the data labels.
seriesTotal.HasDataLabels = true;
SpreadsheetGear.Charts.IDataLabels dataLabels = seriesTotal.DataLabels;

// Position each data label below each data point.
dataLabels.Position = SpreadsheetGear.Charts.DataLabelPosition.Below;

// Change the fill formatting of the data labels.
SpreadsheetGear.Shapes.IFillFormat fillFormat = dataLabels.Format.Fill;
fillFormat.ForeColor.RGB = SpreadsheetGear.SystemColors.Window;
fillFormat.Visible = true;

// Change the line formatting of the data labels.
SpreadsheetGear.Shapes.ILineFormat lineFormat = dataLabels.Format.Line;
lineFormat.ForeColor.RGB = SpreadsheetGear.SystemColors.WindowText;
lineFormat.Visible = true;

// Change the legend position to the top of the chart.
chart.Legend.Position = SpreadsheetGear.Charts.LegendPosition.Top;

// Get a reference to the primary value axis, hide major
// gridlines, and use a fixed major unit scaling value.
SpreadsheetGear.Charts.IAxis valueAxis =
    chart.Axes[SpreadsheetGear.Charts.AxisType.Value];
valueAxis.HasMajorGridlines = false;
valueAxis.MajorUnit = 0.25;

// Change the chart font name and size.
chart.ChartArea.Font.Name = "Verdana";
chart.ChartArea.Font.Size = 8;

// Add a chart title and change the font size.
chart.HasTitle = true;
chart.ChartTitle.Text = "Weekday Calorie Intake";
chart.ChartTitle.Font.Size = 9;