Create a grid of viewports (CSS-grid inspired)
Arguments
- nrow
Integer. Number of rows.
- ncol
Integer. Number of columns.
- widths
List/vector of units for column widths. Default equal rel.
- heights
List/vector of units for row heights. Default equal rel.
- gap_x
Horizontal gap between panels (unit). Default
mm(0).- gap_y
Vertical gap between panels (unit). Default
mm(0).