add_region( [ChipsId,] sides, xx, yy, radius [,attributes])
add_region( [ChipsId,] xvals, yvals, [,attributes])

Description

• ChipsId - an optional ChipsId structure containing values to modify the currency state for the command.
• sides - the number of sides on a regular polygon (i.e. 3=triangle, 4=square, 5=pentagon, etc.)
• xx,yy - the location of the center of the regular polygon; the current coordinate system is used if one is not specified.
• radius - the distance from the center (xx,yy) of the regular polygon to the edge; the current coordinate system is used if one is not specified.
• xvals, yvals - arrays of x and y coordinates to create a non-convex region from (xvals[0],yvals[0]) to (xpos[n], yvals[n]). Degenerate (self-intersecting) polygons are not supported.
• attributes - optional parameters which allow the user to configure properties though a structure, list, or attribute string.

The add_region command creates a region whose attributes are specified by user preferences or in an attribute list. The new region becomes current by default; providing a ChipsId overrides the currency state.

Clipping

Regions displayed in data coordinates are clipped at the plot boundaries.

Customizing the Region

There are several attributes that control the region characteristics. The attributes can be set to the ChIPS defaults, values provided in the add_region command, or values from the user's preference file.

The attributes may also be modified with the set_region command at any time; see "ahelp py.chips set_region" and "ahelp py.chips setget" for more information.

The attributes associated with regions are:

Attribute	Description	Options	Default
angle	Angle at which the region is drawn	-360.0:360.0	0.0
depth	Integer value indicating region depth	see the Depth section of "ahelp py.chips chipsopt"	100
edge.color	region edge color	see the Color section of "ahelp py.chips chipsopt"	green
edge.style	stipple pattern used to draw the region edges	see the Line Style section of "ahelp py.chips chipsopt"	chips_solid
edge.thickness	Thickness of the region edge	0.5:10	1
fill.color	region fill color	see the Color section of "ahelp py.chips chipsopt"	green
fill.visible	Should the region be filled or not	false|true; see the Booleans section of "ahelp py.chips chipsopt"	false
opacity	Opacity of the region fill, if visible	0.0:1.0	0.5
stem	stem used for region id	alphanumeric	reg

chips> add_region(6,.5,.5,.4)

chips> settings = ChipsRegion()
chips> settings.fill.color = 'cyan'
chips> settings.fill.visible = 1
chips> settings.edge.color= 'beige'
chips> add_region([40,70,70],[10,70,10],settings)

chips> add_region([.1,.5,.9],[.9,.2,.7],['edge.color', 'red',
'edge.style', 'shortdash'])