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Curve command
Apr 22 2013 01:00 AM 
Community Administrator
in Sketcher 1417 Views
Draws a smooth, Bspline curve by points. You can click and drag to define a freehand curve, or you can click to create edit points to define the curve. If you click edit points, you must define at least three points to create the curve.
When editing a curve created from edit points, you also can use the Closed option to:
Displaying curves
You can use the options on the Curve command bar to control the display of a curve.
The Add/Remove Points button adds or removes edit points along the curve. When you add an edit point, the shape of the curve does not change. If the number of edit points on the curve is the same as the number of control vertex points, adding an edit point adds a corresponding control vertex point. The control vertex point moves to maintain the shape of the curve.
When you remove edit points, the control vertex points move, and the shape of the curve changes.
See Insert or remove points on a curve.
The Show Polygon button turns on the control polygon of the curve. This polygon displays when the curve is not selected.
The edit points and control vertex points are handles that you can drag to change the shape of the curve.
The Show Curvature Comb button displays the curvature comb for the curve. This helps you determine how quickly or gradually curves change and where they change direction.
You can use the Curvature Comb Settings command to control the density and magnitude of the curve.
Editing curves
The Curve command bar controls how the shape of the curve changes when you make changes to the edit points and control vertex points.
The Shape Edit and Local Edit buttons control the shape of the curve when you move a point on the curve.
When you select the Shape Edit button, you affect the shape of the entire curve when you move a point on the curve.
When you select the Local Edit button, you affect the shape of the curve around the edit point.
With Local Edit, if you drag a vertex point on an unconstrained curve, no other vertex points will move. However, if you drag a vertex point on a curve that has some relationships, then other vertex points may move as well. This allows the curve to adapt to the new location of the vertex point you moved while still maintaining the relationships.
You can select the Curve Options button to display the Curve Options dialog box. You can use this dialog box to change the number of degrees for the curve and to specify the relationship mode for the curve. You can set the relationship mode to:
In Rigid mode you cannot use external relationships to control the shape of the curve. Instead, the curve shape remains unchanged and the curve simply rotates.
Simplifying curves
You can use the Simplify Curve command to simplify a polygonbased curve by reducing the number of edit points and control vertex points on a curve. The Simplify Curve dialog box increases or decreases a fit tolerance for the curve.
What are you looking for?
(Hold down CTRL key to open links in a new window)
How do I
When you create a curve, edit points (1) and curve control vertex points (2) are created to help you edit and control the shape of the curve.
Closing curves
You can use the Closed option on the Curve command bar to create a continuous line that forms a closed curve connected tangentially at the first and last point you click.
When editing a curve created from edit points, you also can use the Closed option to:
 Close an open curve, without adding points.
 Open a closed curve, without deleting points.
Displaying curves
You can use the options on the Curve command bar to control the display of a curve.
The Add/Remove Points button adds or removes edit points along the curve. When you add an edit point, the shape of the curve does not change. If the number of edit points on the curve is the same as the number of control vertex points, adding an edit point adds a corresponding control vertex point. The control vertex point moves to maintain the shape of the curve.
When you remove edit points, the control vertex points move, and the shape of the curve changes.
Note:
If there are only two edit points on the curve, you cannot remove an edit point from the curve.
If there are only two edit points on the curve, you cannot remove an edit point from the curve.
See Insert or remove points on a curve.
The Show Polygon button turns on the control polygon of the curve. This polygon displays when the curve is not selected.
The edit points and control vertex points are handles that you can drag to change the shape of the curve.
Note:
You can also use these points as keypoints for relationships and dimensions.
You can also use these points as keypoints for relationships and dimensions.
The Show Curvature Comb button displays the curvature comb for the curve. This helps you determine how quickly or gradually curves change and where they change direction.
You can use the Curvature Comb Settings command to control the density and magnitude of the curve.
Editing curves
The Curve command bar controls how the shape of the curve changes when you make changes to the edit points and control vertex points.
The Shape Edit and Local Edit buttons control the shape of the curve when you move a point on the curve.
When you select the Shape Edit button, you affect the shape of the entire curve when you move a point on the curve.
When you select the Local Edit button, you affect the shape of the curve around the edit point.
With Local Edit, if you drag a vertex point on an unconstrained curve, no other vertex points will move. However, if you drag a vertex point on a curve that has some relationships, then other vertex points may move as well. This allows the curve to adapt to the new location of the vertex point you moved while still maintaining the relationships.
Note:
You cannot drag an edit point that is fully constrained.
You cannot drag an edit point that is fully constrained.
You can select the Curve Options button to display the Curve Options dialog box. You can use this dialog box to change the number of degrees for the curve and to specify the relationship mode for the curve. You can set the relationship mode to:
 Flexible
 Rigid
In Rigid mode you cannot use external relationships to control the shape of the curve. Instead, the curve shape remains unchanged and the curve simply rotates.
Simplifying curves
You can use the Simplify Curve command to simplify a polygonbased curve by reducing the number of edit points and control vertex points on a curve. The Simplify Curve dialog box increases or decreases a fit tolerance for the curve.
Note:
Simplifying a curve can cause the relationships placed on a curve to be deleted.
Simplifying a curve can cause the relationships placed on a curve to be deleted.
What are you looking for?
(Hold down CTRL key to open links in a new window)
How do I
 Draw a curve
 Insert or remove points on a curve
 Display the control polygon for a curve
 Simplify a curve
 Modify element properties
 Curve command
 Simplify Curve command
 Curve Options dialog box
 Curve command bar
 Element Properties dialog box (Curve)
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