Aspose::Cells::Charts::Series::SetFirstSliceAngle method. Gets or sets the angle of the first Pie-Chart or doughnut-Chart slice, in degrees (clockwise from vertical). Applies only to Pie, 3-D Pie, and doughnut Charts, 0 to 360 in C++....Aspose::Cells::Charts::Series::SetFirstSliceAngle method Ser...angle of the first pie-chart or doughnut-chart slice, in degrees...