如何在Java中使用GcExcel生成Excel气泡图？

public void generateBubbleChart() {     // 创建工作簿     Workbook workbook = new Workbook();      // 获取工作表     IWorksheet worksheet = workbook.getWorksheets().get(0);      // 添加气泡图     IShape shape = worksheet.getShapes().addChart(ChartType.Bubble, 250, 20, 360, 230);      // 设置图表数据     worksheet.getRange("A1:C10").setValue(new Object[][]{         {"Blue", null, null},         {125, 750, 3},         {25, 625, 7},         {75, 875, 5},         {175, 625, 6},         {"Red", null, null},         {125, 500, 10},         {25, 250, 1},         {75, 125, 5},         {175, 250, 8},     });      // 添加数据系列     shape.getChart().getSeriesCollection().add(worksheet.getRange("A1:C5"), RowCol.Columns);     shape.getChart().getSeriesCollection().add(worksheet.getRange("A6:C10"), RowCol.Columns);      // 设置图表标题