11.10 circle

circle [ item <id> ] [at] <vector> radius <length>
       [ with { <option> } ]

The circle command is used to draw circles on multiplot canvases. The coordinates of the circle’s center and its radius are specified. The with modifier allows the style of the circle to be specified using similar options to those accepted by the plot command. The example

circle at 2,2 radius 1 with color red fillcolor blue

would draw a red circle of unit radius filled in blue, centered $2\, \mathrm{cm}$ above and to the right of the origin.

All vector graphics objects placed on multiplot canvases receive unique identification numbers which count sequentially from one, and which may be listed using the list command. By reference to these numbers, they can be deleted and subsequently restored with the delete and undelete commands respectively.