6.21  region%

A region% object specifies a portion of a drawing area (possibly discontinuous). It is normally used for clipping drawing operations.

Each region% object is associated to a particular dc<%> object, specified when the region is created. A region can only be used with its associated dc<%> object. The origin and scale of a drawing context affects the region when the region is set, but not when the region is used.

See also set-clipping-region in dc<%> and get-clipping-region in dc<%>.

• (new region% (dc _)) -> region% object
     dc : dc<%> object

  Creates an empty region.

  
  

Methods
    get-bounding-box
    get-dc
    in-region?
    intersect
    is-empty?
    set-arc
    set-ellipse
    set-path
    set-polygon
    set-rectangle
    set-rounded-rectangle
    subtract
    union
    xor