GETVIEWCOORD, GETVIEWCOORD_W

Graphics Subroutine: Translates physical coordinates or window coordinates to viewport coordinates.

Module: USE DFLIB

Syntax

CALL GETVIEWCOORD (x, y, t)
CALL GETVIEWCOORD_W (wx, wy, wt)

x, y
(Input) INTEGER(2). Physical coordinates to be converted to viewport coordinates.

t
(Output) Derived type xycoord. Viewport coordinates. The xycoord derived type is defined in DFLIB.F90 (in the \DF98\INCLUDE subdirectory) as follows:

TYPE xycoord
  INTEGER(2) xcoord   ! x-coordinate
  INTEGER(2) ycoord   ! y-coordinate
END TYPE xycoord

wx, wy
(Input) REAL(8). Window coordinates to be converted to viewport coordinates.

wt
(Output) Derived type xycoord. Viewport coordinates. The xycoord derived type is defined in DFLIB.F90 (see above).

Viewport coordinates refer to an area of the screen defined as the viewport with SETVIEWPORT. Physical coordinates refer to the whole screen. Both take integer coordinate values. Window coordinates refer to a window sized with SETWINDOW or SETWSIZEQQ. Window coordinates are floating-point values and allow easy scaling of data to the window area. For a more complete discussion of coordinate systems, see Understanding Coordinate Systems in the Programmer's Guide.

Compatibility

STANDARD GRAPHICS QUICKWIN GRAPHICS LIB

See Also: GETPHYSCOORD, GETWINDOWCOORD

Example

See the example program in GETPHYSCOORD.