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{alias:vie}
h2. Name

*vie* — Viewport handling

h2. Syntax
{panel:|borderStyle=solid|borderWidth=1|bgColor=#FFFFAA}

*vie* _nx ny number_

*vie* _number_ *| next| pre | coor* \[*con*] 

*vie def | del* 

*vie 1 1 1* 

{panel}

h2. Description

Viewports are rectangular sub-areas of the screen or a plot. 

h2. Arguments

_nx ny number_
{indent}Make _nx_ times _ny_ viewports and use viewport number _number_ as the active viewport. Default, the present display will be moved to the lower left viewport. If you do not want that display, erase it.{indent} 
_number_ 
{indent}Select viewport number _number_.{indent}
*def* 
{indent}Erase all viewports and reset to one viewport (the whole screen).{indent} 
*del* \[_number_] 
{indent}Delete active viewport \[or viewport number _number_].{indent} 
*next* 
{indent}Go to next viewport.{indent} 
*pre* 
{indent}Go to previous viewport.{indent} 
_number_ *| next | pre con* 
{indent}Connect camera from present viewport to the _number_ *| next | pre* viewport. This will make the viewports suitable for parallel display of two datasets.{indent} 
*1 1 1* 
{indent}Create an initial viewport for coordinate selection.{indent} 
*coor* _x1 y1 x2 y2_ 
{indent}The coordinates are in virtual display coordinates from 0 to 1. x1 y1 is the lower left corner, x2 y2 is the upper right corner left. NB! Needs a vie 1 1 1 viewport as a base.{indent} 
*con* 
{indent}Will connect the viewport camera to the previous.{indent} 

h2. Examples

h3. Ex.1: Viewport scenes

{noformat:|borderWidth=1|bgColor=#eeeeee}
        # One can copy geometry to scalars and then to another
        # scalar set of another surface thus displaying
        # one surface as scalars on top of another.
        vie def                 ;# reset viewport
        ret 10                  ;# return start window
        vie 2 2 1               ;# set up 4 viewports, select first
        mak ran 11              ;# make random points
        grp 70 70               ;# make grid and scalars
        ssc                     ;# self scale
        mak p                   ;# transform grid to polydata
        acm n 11                ;# map display
        mhi grid1               ;# move grid to hi grid1
        vie 2 con               ;# select viewport 2 and connect to previous
        mak ran 11              ;# make new random points
        grp 70 70               ;# make new grid
        mak p                   ;# transform grid to polydata
        acm l                   ;# map display
        mhi grid2               ;# move grid to hi grid2
        vie 3 con               ;# select viewport 3
        mak rsc grid1           ;# replace scalars from grid1
        acm l                   ;# map grid1 on top of grid2
        con l                   ;# contour grid1 on top of grid2
        vie 4 con               ;# select viewport 4
        map                     ;# map grid1 on top of grid2
        con l                   ;# contour grid1 on top of grid2
{noformat}
The above example produces this image. 

!att:_img_ref^cmd_vie.png!
_Connected viewports_

h2. See also

[xwi - Window on screen], [win - Window specification], [ssc - Self scale of data]
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