TDRect Struct Reference

Double precision rectangle defined by its edges. More...

Data Fields
double	Bottom
	Bottom edge of the rectangle (inclusive).
double	Left
	Left edge of the rectangle.
double	Right
	Right edge of the rectangle (inclusive).
double	Top
	Top edge of the rectangle.

Detailed Description

Double precision rectangle defined by its edges.

The edges of the rectangle are always parallel to the image borders:

Normally the four edges are given in pixel coordinates which have a fixed coordinate system with its origin at the left/top border of the image and no scaling or rotation.

Thus most functions using TDRect do not use the image's coordinate system.

The four vertices are (Left, Top), (Right, Top), (Right, Bottom), and (Left, Bottom).

Note

The line segments [(Left, Top) (Right, Top)] and [(Left, Top) (Left, Bottom)] are inclusive. This means that the Right and Bottom edges are considered to be inside the rectangle. Width and height are:
width = Right - Left + 1
height = Bottom - Top + 1

Attention

Empty rectangles have a width and height of zero:
Left = 0, Top = 0
Right = -1, Bottom = -1

See also

TCoordinateMap for information on the coordinate systems; TArea.