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QCad User Reference Manual
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21. Polylines
Click the polyline button in the CAD toolbar to show the polyline
toolbar.
21.1. Creating a Polyline
CAD Toolbar:
Menu:
Draw - Polyline - Create
Command:
polyline
Options Toolbar:
Description:
This tool lets you draw polylines. A polyline is a continuous line
formed from one or more connected line or arc segments.
Procedure:
- Specify the startpoint of the first polyline segment. You can use the
mouse or enter a coordinate in the console.
- Specify the endpoint of the first polyline segment.
- Specify the endpoints of additional polyline segments.
Note: If your polyline contains arc segments, you can tick the 'Arc'
checkbox and enter the arc radius in the options toolbar when setting the
endpoint of an arc segment. The arc will connect smoothly (tangential) to
the last segment.
21.2. Adding Nodes to Polylines
CAD Toolbar:
Menu:
Draw - Polyline - Add node
Description:
With this tool you can add nodes to existing polylines. Adding a new
node to a polyline means to split one segment up into two segments. The two
new segments are both straight, even if the original segment was an
arc.
Procedure:
- Specify the segment of the polyline in which you want to add the new
node.
- Specify the position of the new node with your mouse or by entering a
coordinate.
21.3. Appending Nodes to Polylines
CAD Toolbar:
Menu:
Draw - Polyline - Append node
Description:
With this tool you can append nodes to the beginning or end of existing
polylines. Appending a node to a polyline means to extend it by a segment
at the beginning or end.
Procedure:
- Click the polyline somewhere near the end to which you want to append
a node.
- Specify the position of the new node(s) with your mouse or by
entering a coordinate.
For appending nodes, the same options are available as when creating new
polylines.
21.4. Deleting Nodes from Polylines
CAD Toolbar:
Menu:
Draw - Polyline - Delete Polyline node
Description:
Use this tool to remove nodes from existing polylines. This way two
segments of a polyline can be joined into one.
Procedure:
- Specify the polyline from which you want to delete nodes.
- Specify the position of the node that you want to remove. In most
cases it is appropriate to use the endpoint snap function to specify
the node. The tool automatically activates that snap function by
default.
21.5. Deleting Segments Between Two Nodes
CAD Toolbar:
Menu:
Draw - Polyline - Delete between two nodes
Description:
Use this function to delete all segments between two nodes of an
existing polyline.
Procedure:
- Specify the polyline from which you want to delete segments.
- Specify the position of the first limiting node. That is the node
from where you want to start deleting segments. The node itself will
not be deleted. In most cases it is appropriate to use the endpoint
snap function to specify the node. The tool automatically activates
that snap function by default.
- Specify the position of the node where you want to stop deleting.
All segments that are between the first node and the second node are
removed from the polyline. After the segments are deleted, the two
limiting nodes are connected by a straight line segment so the polyline
is still one continuous line string.
21.6. Trimming Polyline Segments
CAD Toolbar:
Menu:
Draw - Polyline - Trim segments
Description:
Use this function to trim two polyline segments. This means to extend or
shorten the two segments, in a way that they meet at one common point.
Procedure:
- Specify the first polyline segment to trim by clicking it with the
mouse.
- Specify the second segment to be trimmed from the same polyline.
All segments that are between the first segment and the second segment
are removed to keep the polyline a continuous line string.
21.7. Creating Equidistant Polylines
CAD Toolbar:
Menu:
Draw - Polyline - Equidistant
Options Toolbar:
Description:
This tool lets you create equidistant polylines to existing polylines.
Procedure:
- Enter the distance of the equidistant and the number of equidistants
you want to create at once in the options toolbar.
- Click the original polyline. The equidistant will be created on the
side on which you click the polyline.
21.8. Creating a Polyline from Existing Segments
CAD Toolbar:
Menu:
Draw - Polyline - Create from Segments
Description:
This tool lets you create polylines from existing segments (lines and
arcs that are connected).
Procedure:
- Click one of the segments. A polyline is created from the selected
entity and all entities that are connected to its end- or startpoint.
