The bbox2 subroutine calculates the bounding box , transforms it to screen coordinates , and compares it to the viewport . If the bounding box is completely outside the viewport, the routines between the call to the bbox2 subroutine and the end of the object are ignored. If the bounding box is within the viewport, the system compares it with the minimum feature size. If the box is too small in both the x and y dimensions, the rest of the routines in the object are ignored. Overuse of the bbox2 subroutine can impair performance, so it is best reserved for complicated object definitions.
Parameters xmin Specifies the width, in pixels, of the smallest displayable feature.
Specifies the x coordinate of a corner of the bounding box. Specifies the x coordinate of a corner of the bounding box. Specifies the y coordinate of a corner of the bounding box. Related Information Creating an object with the makeobj subroutine.