bol - Border line

Name

bol — Border line

Syntax

bol [linewidth] [nrg] [sav] [tub] [col] [edge] [fang] [flat] [nodraw]

Description

Generate and draw a border line around a grid or a triangle structure. The border line may be used to outline the grid for display purposes, or it may be extracted as a separate dataset (argument nrg) for further use.

Arguments

linewidth

Draw border line with line width linewidth where linewidth is [1, 2, 3 ..]. 1 is the thinnest line, one pixel in width.

nrg

Apply no regridding (decimation) of the grid.

col red | blu | gre |pin | tur | yel | whi | bla | bro

Display the border line in color red / blue / green / pink / turquoise / yellow / white / black / brown

sav

Save the border line in workspace ^bol. Make it active by mlo ^bol. The saved border line contains many cells or line pieces. To sort the line pieces together into a continuous line do the command mak sortpl - Make sorted and connected polyline. This is necessary if one wants the border to be one consecutive line.

tub [factor]

Display border line as a tube. The factor is a number larger than 0, relative to 1 (default), giving the thickness of the tube.

edge

Display internal and external edges of the dataset.

fang feature_angle

Controls the edge finding property. feature_angle is ...? The old Geocap logo uses fang 60.

flat level

The border line result is displayed at z-level level. E.g. bol flat 200 will display the border line at z=200.

nodraw

No display of border result. Often used with argument sav, where the border line is saved in a workspace.

Examples

Ex.1: Borderline around grid

# read any grid
bol 3 col red
col bla
pol x sel 10   ;# draw every 10th gridline in x-direction
col bla
pol y sel 10   ;# draw every 10th gridline in y-direction

Red border line from bol 3 col red

Border line produced by Additional Display > Border line, blue

Ex.2: Border line in old logo

scaz off                      ;# set scale in z to default
d3                            ;# set to 3d
upd u                         ;# set z direction upwards
z                             ;# blank screen
rea $Geocap::geocapdir/data/logo_text.vtk   ;# read text
win -100 100 -100 100 0 100   ;# set window
col .6 .7 .9                  ;# set rgb color
bol tub fang 60               ;# border of logo-text
rea $Geocap::geocapdir/data/logo.vtk    ;# read logo
col whi                       ;# set color to white
cur                           ;# draw spline

Old Geocap logo, using bol