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The Polyline
tools are a set of tools for performing various types of editing and inquiry
operations on polylines.
 Toolbar
: Polyline
Tool Set 1 
Menu : GeoTools 
Polyline Tool Set 1
Join 3D Polylines
 Command
line: GT_3DJ
Joins 3D
segments (lines or polylines) and combines them into a 3D polyline. The PEDIT
command does not allow joining of 3D segments. This command fills the
need by allowing the Join subcommand to be applied on 3D polyline
segments or lines. The segments to be joined must be exactly touching each
other.
Once the command has been issued, the prompts that follow are similar to the
PEDIT command. You are prompted to select polylines. If a line has been
selected, you are prompted to convert it into a polyline. Then you select the
objects to join. All touching segments are joined to the first segment
resulting in a joined 3D Polyline.
Select 3d polylines/lines to join (or ENTER to select by layer[s]):
Select objects: (do so)
If you are
selecting multiple layers for processing, GT_3DJ will join them individually
in their respective layers. They will not be joined across different layers
except if they are selected explicitly from the command line.
See
Also: GT_PLJOIN
 GT_3DJ
Tutorial
Toolbar
: Polyline
Tool Set 1 
Menu : GeoTools Polyline Tool Set 1
Automated join 2D Polylines
Command
line:
GT_PLJOIN
Automatically fuses (joins) all selected line or
polyline objects together. The objects should be touching each other at their
ends.
See Also: GT_3DJ
Toolbar
: Polyline
Tool Set 1 
Menu : GeoTools Polyline
Tool Set 1 Change 2D to 3D Polylines
Command
line: GT_CH2D3D
Converts all
the selected 2D Polylines to 3D polylines. A 3D polyline can hold different Z
values in each of its vertex. The new 3D polylines thus formed will look
exactly like the 2D polylines except that internally they are 3D and
therefore can hold Z values.
The standard object selection dialog appears and allows polylines and lines
to be selected. Click Apply and all the 2D polylines are converted
into 3D polylines. The original 2D polyline will be erased.
Tech Info: GT_CH2D3D changes the DXF Group Code 70 of each polyline,
adds the 8 bit and recreates a 3D polyline. The 3D polyline thus created has
the 3D flag set. The 3D polyline acquires new handles but any extended entity
data in the 2D polyline will be transferred to the 3D polyline.
GT_CH2D3D
Tutorial
See also: GT_CH3D2D
Toolbar
: Polyline
Tool Set 1 
Menu : GeoTools Polyline Tool Set 1
Change 3D to 2D Polylines
Command
line: GT_CH3D2D
Converts all selected 3D polylines and lines into 2D
polylines and lines. Depending on the setting of the PLINETYPE variable, the
2D polylines thus formed will be either heavy weight polylines or light
weight polylines.
While creating the 2d polylines, you can specify the constant elevation that
the 2d polylines should acquire.
The following options are possible:
Set to 0.0
Lowest Z of each 3d polyline
Highest Z of each 3d polyline
First vertex elevation
Average of all vertices (default)
The standard object selection dialog appears and allows polylines and lines
to be selected.
Click Apply and the all the 3D polylines and lines are converted into
2D polylines. The original 3D polyline will be erased.
Tech Info: CH3D2Dchanges the DXF Group Code 70 of each polyline,
removes the 8 bit and recreates a 2D polyline. The 2D polyline acquires new
handles but any extended entity data in the 3D polyline will be transferred
to the 2D polyline.
See also: GT_CH2D3D
Toolbar : Polyline Tool Set 1 
Menu : GeoTools Polyline Tool Set 1
Delete polyline vertex
Command
line: GT_DELVX
Allows
picking a polyline vertex and deleting it in one step. A handy shortcut resulting
in much fewer mouse clicks than using the PEDITàEDIT VERTEXàNEXT....
See also: GT_INSVX and GT_XV (Express PEDIT commands)
Toolbar : Polyline Tool Set 1 
Menu : GeoTools Polyline Tool Set 1
Insert polyline vertex
Command
line: GT_INSVX
Pick any
point along a polyline and add a vertex at the picked location. A handy shortcut
resulting in much fewer mouse clicks than using the Pedit->Edit
Vertex->Next.....
See
also: GT_DELVX and GT_XV (Express PEDIT commands)
Toolbar
: Polyline
Tool Set 1 
Menu : GeoTools Polyline Tool Set 1
Flip polyline flow direction
Command
line: GT_FLIP
Reverses the
direction of the polyline vertices. This command preserves the handle (see below
for conditions) as well as any extended entity data that is stored with the
polyline or with each or any of its vertices (in case of heavy weight
polylines).
Direction Control:
Clockwise:
Choosing this option flips all counter-clockwise
polylines to clockwise
CounterClockwise:
Choosing this option flips all clockwise polylines counter-clockwise
Interchange: Reverses the direction
of all selected polylines irrespective of whether they are clockwise or
counterclockwise.
Low to High Z:
Reverses the direction of the polylines whose last vertex elevation (Z value)
is higher than the first vertex elevation (Z value).
High to Low Z:
Reverses the direction of the polylines whose last vertex elevation (Z value)
is lower than the first vertex elevation (Z value).
Display graphically:
Displays the polyline direction graphically by drawing leader arrows along
the polyline segments. Does not slip the polyline.
Retain same object handle for reversed polylines:
Choosing this option ensures that the reversed polylines have the same
handle as the original polyline. This takes longer time to process and it
does not work on polylines having arc segments. The object handle is always
preserved for 3d polylines irrespective of whether the option above is chosen
or not. In case of 2D polylines, the object handles will not be preserved
unless this option is set. Switching this option off can greatly improve the
process speed especially for long polylines.
Hide dialog
box and run GT_FLIP with current settings:
By clicking this option, you can run GT_FLIP any number of times in the
current session without the dialog box. You will be prompted to only select
the polylines to flip and the program operates with the settings last set.
The setting remains in place for the current CAD session unless it is reset
using the 'GT_ShowDlg' command.
Tech Info: The extended entity data in the objects will always be
retained.
Toolbar
: Polyline
Tool Set 1 
Menu : GeoTools Polyline Tool Set 1
Densify polylines
Command
line: GT_DENSIFY
This command
can be used to add extra vertices to the polylines, i.e. 2D or 3D based on
the "Number of segments" and "Length of segment"
Densify
Method
Number of segments: Densifies or adds vertices with specified number
of segments.
Length of segment: Densifies or adds vertices with specified length
i.e. distance between each vertices.
Tech Info: GT_Densify will not work on polylines consisting any arc
segments in them. Such polylines will be ignored by the GT_Densify command
and must be pre-processed using other GeoTools commands before they can be
densified.
See Example: GT_Densify
Toolbar
: Polyline
Tool Set 1 
Menu : GeoTools Polyline Tool Set 1
Weed polylines based on inter-vertex
distance and angular deflections
Command
line: GT_DISTANGWEED
This command
can be used to eliminate redundant vertices in a polyline by weeding out
vertices that fall closer than a specified value or those segments that
deflect less than a given angular value. There is also an option to create a
point object at every location where a vertex was weeded.
Weed vertices closer than this value [drawing units]:
Enter the linear tolerance parameter here. This is
specified in drawing units. Any two consecutive vertices that are closer
(nearer) than this value will result in the second vertex to be removed.
Weed if deflection angle is within this
value [degrees]:
Enter the angular tolerance parameter value in degrees.
Create marker at every weeded location:
Checking this box creates a POINT object marker at every vertex location that
was weeded. This helps in identifying the locations where the weeding took
place.
Weed criteria
Distances: Checking this option causes weeding based on
inter-vertex distance only.
Deflection angle: Checking this option causes weeding based on
deflection angle only.
Deflection distance: Checking this option causes weeding based on deflection distances only.
Deflection distance and angle: Checking this option causes weeding based on both deflection distance and
deflection angle.
Distance and deflection distance: Checking this option causes weeding based on both inter-vertex distances and
deflection distance.
Measure distances in:
Slope: Checking this option measures slope (actual) distances.
Horizontal: Checking this option measures horizontally projected
distances.
Tech
Info: Polylines
containing ARC segments will be weeded based on their inter-vertex straight
line lengths and NOT the actual arc distances. Therefore, in areas where arc
segments exist, the results may sometimes not be as desired. You may want to
convert the arc segmented polylines to linear segmented polylines using the
GT_PLARC2PL command.
See also: GT_DENSIFY, GT_REM_LINVERTS
Toolbar
: Polyline
Tool Set 1 
Menu : GeoTools Polyline Tool Set 1
Weed (remove) collinear vertices from
polylines
Command
line: GT_REM_LINVERTS
The
GT_REM_LINVERTS command removes vertices which are collinear. Any three
vertices which fall in a straight line are said to be collinear and will be
be removed.
Mark locations of removed vertices with points: Checking this box marks points at the location where the linear vertices
were removed.
See also: GT_DISTANGWEED , GT_DENSIFY
Toolbar : Polyline Tool
Set 1 
Menu : GeoTools Polyline
Tool Set 1 Assign interpolated Z values to vertices.
Command line: GT_PL_INTER
Often, you may have polylines in which some vertices
have a zero elevation while others have non-zero elevations. This command fills
in all the zero [0.0] elevation vertices with non-zero values based on a
linear distance interpolation between the non-zero vertices.
Create
interpolation output file: Checking this box creates an .txt output file of
interpolation
Output filename...: Click on this button to specify the output file path.
Zero tolerance: Enter the required tolerance value.
GT_PL_INTER
Tutorial
Toolbar
: Polyline
Tool Set 1 
Menu : GeoTools Polyline Tool Set 1
Highlight PLINE vertices with 0 elevation
Command
line: GT_PL_0
The PL_0 command identifies vertices in polylines,
which have an elevation of 0.0. This is particularly useful to study erring
3d polylines, which have one or a few vertices, whose elevation has fallen to
0.0 because of an erroneous program or due to operator error.
A POINT object is created on a temporary layer at the positions of vertex
whose elevation is 0.0
GT_PL_0
Tutorial
Toolbar
: Polyline
Tool Set 1 
Menu : GeoTools Polyline Tool Set 1
Place points or blocks along polyline
vertices
Command
line: GT_PL_PLACE
This command places a point or a block at each vertex
of a polyline/line. Useful for many mapping and utility applications.
What
to place?:
Points: Choosing this option allows to place points on vertices
of Pline/Line. On specified layer.
Blocks: Choosing this option allows to place block on vertices of
Pline/Line. On specified layer.
Block Name: Clicking on the button "Block Name"
allows to select the block for insertion.
(Note: You can select one block at a time)
Insertion Settings:
Scale Factor: Allows to enter the required scale factor for the
block.
Rotation Angle: Allows to enter the required rotation angle for the
block.
Which
layer to place?:
Source: Choosing this option places the block/point in source
object layer.
Current: Choosing this option places the block/point in current layer.
GT_PL_PLACE Tutorial
See Example: GT_PL_Place
Toolbar
: Polyline
Tool Set 1 
Menu : GeoTools Polyline Tool Set 1
Merge adjacent closed polylines
Command
line : GT_MERGEPOLY
The
GT_MERGEPOLY command is used to merge adjacent closed polylines which have
overlapping and common boundaries between them. This is a useful tool to
process a set of adjacent closed polylines resulting from typical GIS
analyses etc. and retain only the outer-most external boundary out of them.
For this program to function, there must be overlapping segments between two
polygons. If there is no overlapping polylines segments at the boundary, it
will not be processed.
An illustration of what this program does is shown in the image below:
Toolbar
: Polyline
Tool Set 1 
Menu : GeoTools Polyline
Tool Set 1 Flip (mirror) arc segments of polylines
Command
line : GT_PLARCMIRROR
The
GT_PLARCMIRROR command flips (mirrors) ONLY the arc segments of a polyline
with arcs. This can be a useful tool to flip the direction of polyline arcs
in many mapping situations where arced polylines are used to show vegetaion
symbols. In particular, this command may be used to fix the polyline arc
direction if it has been generated incorrectly by the GT_VEGLINE command in
GeoTools.
Toolbar
: Polyline
Tool Set 1 
Menu : GeoTools Polyline
Tool Set 1 Specify segment lengths in polylines
Command
line : GT_SEGLENSET
The
GT_SEGLENSET command is used to specify a new segment length for each of the
segments of the polyline. The command will highlight each segment of the
polyline one by one in red color and ask for a new segment length. On
entering the new length, the polyline is updated such that the segment gets the
specified length.
Toolbar
: Polyline Tool Set 1 
Menu
: GeoTools  Polyline
Tool Set 1
Extract part of polyline
 Command
line : GT_PARTEXTRACT
The GT_PARTEXTRACT
command is useful to extract part of a polyline. You will be asked to pick
two points that fall on the polyline and all the segments in between the
two picked points will be extracted and a new polyline will be created on
the current layer.
Note: Polylines which have been curve fit using the Fit or Spline option
cannot be used by this command. If there are arc segments in the polyline,
they will be replaced with their straight line joins.
Toolbar
: Polyline Tool Set 1 
Menu
: GeoTools Polyline
Tool Set 1
Copy part of polyline
Command
line :
GT_PARTCOPY
The GT_PARTCOPY command
is useful to copy a part of a polyline. You will be asked to pick two
points that fall on the polyline and a polyline will be created between
these two points and you will be asked to move this polyline and place it
at a new location.
Note: Polylines which
have been curve fit using the Fit or Spline option cannot be used by this
command. If there are arc segments in the polyline, they will be replaced
with their straight line joins.
Toolbar
: Polyline Tool Set 1 
Menu
: GeoTools Polyline
Tool Set 1
Offset part of polyline
Command
line :
GT_PARTOFFSET
The GT_PARTOFFSET command is useful to offset part
of a polyline. You will be asked to pick two points that fall on the
polyline and all the segments in between the two picked points will be
offset using the standard AutoCAD OFFSET command.
Note:
1) Polylines which have been curve fit using the Fit or Spline option
cannot be used by this command.
2) If there are arc segments in the polyline, they will be replaced with straight
line segments.
Toolbar
: Polyline Tool Set 1 
Menu
: GeoTools Polyline
Tool Set 1
Stretch part of polyline
Command
line :
GT_PARTSTRETCH
The GT_PARTSTRETCH
command is useful to stretch a portion of a polyline. You will be asked to
pick two points that fall on the polyline and all the segments in between
the two picked points will be stretched to a new location. Once
the new polyline is created a line is drawn connecting the stretched and
un-stretched portions of the polyline.
Note: Polylines which have been curve fit using the Fit or Spline option
cannot be used by this command. If there are arc segments in the polyline,
they will be replaced with their straight line joins.
Toolbar
: Polyline Tool Set 1 
Menu
: GeoTools Polyline
Tool Set 1
Mirror part of polyline
Command
line :
GT_PARTMIRROR
The GT_PARTMIRROR command
is useful to mirror only a portion of a polyline. You will be asked to
pick two points that fall on the polyline and all the segments in between
the two picked points will be flipped (mirrored) with the two picked
points as the axis of mirroring. The polyline is updated with the new
geometry and retains its handle, Xdata etc.
Note: Polylines which have been curve fit using the Fit or Spline option
cannot be used by this command. If there are arc segments in the polyline,
they will be replaced with their straight line joins.
Toolbar
: Polyline Tool Set 1 
Menu
: GeoTools Polyline
Tool Set 1
Rotate part of polyline
Command
line :
GT_PARTROTATE
The GT_PARTROTATE command
is useful to rotate only a portion of a polyline. You will be asked to
pick two points that fall on the polyline and all the segments in between
the two picked points will be rotated
using the first point as the base point. The polyline is updated
with the new geometry and retains its handle, Xdata etc.
Note: Polylines which have been curve fit using the Fit or Spline option
cannot be used by this command. If there are arc segments in the polyline,
they will be replaced with their straight line joins.
Toolbar
: Polyline Tool Set 1 
Menu
: GeoTools Polyline
Tool Set 1
Reshape part of a polyline
Command
line : GT_PARTRESHAPE
The GT_PARTRESHAPE command can be used to re-shape or, in other words, re-digitize part of a
polyline. You will be asked to pick two points on a polyline and will be prompted to pick the new locations of the points in between. The source polyline will then be updated and the
newly digitized points will be used instead of the old set of points between the two source points.
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