src/swipl-devel/packages/xpce/man/refmanual/md/circle.md

In rswipl: Embed 'SWI'-'Prolog'

class circle {#class-circle}

A circle just an ellipse with equal <-width and <-height. It's border-line may have a <-texture and <-pen. The circle's interior may be filled with an image object using ->fill.

@see class ellipse

Instance variables {#class-circle-instvars}

• circle<-fill: colour|{foreground,background}* When a fill pattern is defined, this pattern is repeated over the interior of the circle. The circle is transparent if the fill pattern equals @nil.

  Defaults: @nil (transparent).

  @see bitmap-status

Send methods {#class-circle-send}

• circle->diameter: int Inherits description from: circle<-diameter

• circle->geometry: x=[int], y=[int], width=[int], height=[int] Handle general resizing of the circle. If either <-width or <-height is specified this value is used for both parameters. If both are specified the minimum of the two is used for both.

• circle->radius: int Inherits description from: circle<-radius

• circle->rotate: int The only PCE class with fully implemented rotation!

Get methods {#class-circle-get}

• circle<-diameter: -> int Sets <-width and <-height to this value. See also ->radius.

• circle<-radius: -> int Half of the <-width. ->radius sets <-width and <-height to twice the argument.

rswipl documentation built on June 16, 2026, 5:07 p.m.