Language Reference

GPORT Call

defines a viewport

CALL GPORT( viewport);

where viewport is a numeric matrix or literal defining the viewport. The rectangular area's boundary is specified in normalized coordinates, where you specify the coordinates of the lower-left corner and the upper-right corner of the rectangular area in the form

{minimum-x minimum-y maximum-x maximum-y}

The GPORT subroutine changes the current viewport. The viewport argument defines the new viewport by using device coordinates (always 0 to 100). Changing the viewport can affect the height of the character fonts; if so, you might want to modify the HEIGHT parameter. An example of a valid statement follows:

  
    call gport({20 20 80 80});
 

The default values for viewport are 0 0 100 100.