TLazRegion

type TLazRegion = class(TFPCustomRegion)

public

  Parts: TFPList;

List with the Rectangles, Polygons, and Ellipses that define the display area for the region.

  IsSimpleRectRegion: Boolean;

Indicates whether this region is composed of a single rectangular part.

  Rect: TRect;

TRect instance with the bounds for the region.

  constructor Create; virtual;

Constructor for the class instance.

  destructor Destroy; override;

Destructor for the class instance.

  procedure Assign();

Stores values from ASrcRegion in the current class instance.

  procedure Clear;

Frees all of the TLazRegionPart instances in Parts, and clears the list.

  procedure CombineWith();

Combines the specified source region using the given region operation.

  function GetRegionKind;

Gets the type of region represented in the class instance.

  function IsSimpleRectEmpty;

Indicates whether the Rect member contains empty or invalid rectangle coordinates.

  procedure AddPart();

Adds the specified part as a subregion in the Parts member.

  procedure AddRectangle();

Adds the specified TRect instance to the Parts member.

  procedure AddPolygon();

Adds a polygonal area with the specified vertices to the region.

  procedure AddEllipse();

Adds an elliptical area with the specified co-vertices to the region.

  procedure SetAsSimpleRectRegion();

Sets the area for the region to the specified rectangle.

  procedure AddPartsFromRegion();

Adds the region (and any subregions) from ASrcRegion to the current class instance.

  procedure DoChangeToComplexRegion;

Adds the value in Rect to the Parts member, and resets the value in IsSimpleRectRegion.

  function GetBoundingRect; override;

Gets the bounds for the region as a rectangle.

  function IsPointInRegion(); override;

Checks whether the specified point is inside the region.

end;

TLazRegion

Represents a custom region in the Lazarus LCL.

TFPCustomRegion

TObject

TLazRegionWithChilds

Implement a region which can have other regions as children.

TLazCanvas

Implements a canvas which masks differences between FCL and LCL canvas classes.

TLazCanvasState.ClipRegion

Defines the clipping region for the canvas.