How do I get the current display coords?

A routine of mine creates a block and inserts it into the drawing. The
block is intended to appear as a part of the operating system and is
erased and deleted at the completion of the routine. I would like the
block size as displayed on screen to be pretty much consistent, created
at a size roughly equal to a % of the screen display, regardless of the
modelspace area displayed.
How can I retrieve the modelspace coordinates of the current display? I
tried the activeviewport.height property, but it does not act as
required. An API call?

Thanks

Tom Craft

 

How about the SCREENSIZE sys. var?

 

Bobby,
Thanks for the reply. Sorry took so long to reply, was on vacation.
The SCREENSIZE sys var returns the dimesions of the screen in pixels.As I
understand the help file (which says very little about this variable), the
screen size reported is dependent on the monitor and Windows display settings
and will not change as the drawing is zoomed in or out.
I am lookling for the dimension of the modelspace drawing that is displayed.

Tom

 

Tom,

Here's what I use to show an "x" at the starting pont of a pline in a lisp.
The "x" is always the same size as seen by the user, ie relative to the
current display. I think you could adapt this to use as the scale for the
block.

(setq start (vlax-curve-getstartpoint objpoly)
leglen (* 0.03 (getvar "viewsize"))
)
(grdraw (polar start (angtof "135" 1) leglen)
(polar start (angtof "315" 1) leglen)
7)
(grdraw (polar start (angtof "45" 1) leglen)
(polar start (angtof "225" 1) leglen)
7)

HTH,
Jeff

 

Not exactly . The name of the sysvar (and the obsolete
documentation) is an artifact of AutoCAD's DOS heritage,
where the graphics window/viewport was the screen, not
a window.

The SCREENSIZE system variable returns the size of the
active viewport, in pixels.

If you want the size of a viewport in model space
drawing units, you can divide the Y component of
the screensize by the viewsize sysvar, and determine
the size of a pixel, and use that to calculate the
other dimension in drawing units.

 

Thanks, Tony