Use grips to change the vertical curves and tangents in an alignment graphically.
Use editing grips to relocate or modify curves and tangents using visual design cues. If you created alignment entities using the constraint-based tools, some editing grips are not available.
Grips are oriented in the direction of the WCS (World Coordinate System) in which the object currently is displayed. The exception is constrained grips, which indicate a particular constraint direction.
Use this grip... |
To do this... |
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AT END OF LINE OR CURVE |
Move an unconstrained pass-through point on a line or curve. On a line, moving this grip affects the length and angle of the line. On a curve, moving this grip does not affect the radius of the curve to which it belongs, but it can affect the radius of another attached entity. |
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AT CENTER OF LINE |
Move an entire line. Moving this grip only affects the line location. |
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AT END OF LINE OR CURVE |
Change the constrained length of a line or curve. This grip appears on lines and curves that have a directly editable length and is aligned with the vector at the end of the line or curve. Moving this grip does not affect the radius of a curve or angle of a line. |
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AT CURVE CENTER POINT |
Change the center point of a circle. Moving a center point changes only the center point. |
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AT PASS-THROUGH POINT |
Change the pass-through point and radius of a curve or circle. Moving a pass-through point affects the radius of the curve. |
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AT POINT OF INTERSECTION |
Change where two tangent points meet. This grip is oriented up with the top pointing toward the Y axis of the world coordinate system. |
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AT PASS-THROUGH POINT |
Change the radius or through point of the curve. The triangle grip appears on curves that have a directly editable radius and is oriented in and constrained to the direction of the change. The circle grip changes the pass-through point and radius of the curve. |
When a grip is selected, you can use either dynamic input or the Alignment Entities vista and Alignment Layout Parameters dialog box to enter precise attribute values for the grip.
Tutorial Exercise: Grip Editing an Alignment
To use grips to edit a fixed line
- In the drawing, click an alignment containing a fixed line.
Grips for a fixed line with two pass-through points:
- Use the grips to edit the line:
- Use the end grips to adjust the line length and pass-through point.
- Use the center grip to move the location of the line.
To use grips to edit a fixed curve with three pass-through points
- In the drawing, click an alignment containing a fixed curve through three points.
Grips for a fixed curve with three pass-through points:
- Move any grip to change a pass-through point, which changes the radius of the curve.
To use grips to edit a fixed curve with a center point and radius
- In the drawing, click an alignment that contains a fixed curve with a center point and radius.
Grips on a fixed curve with a center point and radius:
- Use the grips to edit the curve:
- Move a triangular grip to change the radius.
- Move the center grip to change the center point of the circle.
- Move a circular grip on the circle to change a pass-through point.
To use grips to edit a fixed curve with a center point and a pass-through point
- In the drawing, click an alignment that contains a fixed curve with a center point and a pass-through point.
Grips for a fixed curve with a center point and a pass-through point:
- Use the grips to edit the curve:
- Move the center grip to change the center point of the circle.
- Move the grip on the circle to change the pass-through point.
To use grips to edit fixed or floating intersecting lines
- In the drawing, click an alignment that contains either a fixed or a floating line.
PI (point of intersection) grip where the endpoints of a fixed or floating line meet:
- Move the PI grip in any direction to edit the shared endpoints of the two lines.
To use grips to edit a floating line with a pass-through point
- In the drawing, click an alignment that contains a floating line with a pass-through point.
Grip for a floating line with a pass-through point:
- Move the square grip to edit the endpoint of the line.
To use grips to edit a floating line attached to an entity end
- In the drawing, click an alignment that contains a floating line attached to an entity.
Grips for a floating line attached to an entity:
- Move the triangular grip to change the length of the line.
Note
You cannot move the triangular grip to the beginning of the line grip. Zero length lines are not permitted.
To use grips to edit a floating curve with a pass-through point and radius
- In the drawing, click an alignment that has a floating curve with a pass-through point and radius.
Grips for a floating curve with a pass-through point:
- Use the grips to edit the curve.
- Moving the first circular grip, located at the PC/PT point of the curve, relocates the point of tangency (PT). Use this grip to create a compound or reverse curve with another curve attached to the same entity.
Changing a curve using the PC/PT grip:
- Moving the second circular grip, located at the mid-point of the curve, modifies the radius while changing the pass-through point.
Changing a curve using the midpoint grip:
- Moving the square grip at the end of the curve changes the pass-through point of the curve while holding the curve radius.
Changing a curve using the end grip:
- Moving the triangular grip changes the radius while holding the pass-through point.
Changing a curve using the radius grip:
To use grips to edit a floating curve attached to an entity end with a pass-through point
- In the drawing, click an alignment that contains a floating curve attached to an entity end with a pass-through point.
Grips for a floating curve attached to an entity end with a pass-through point:
- Move the circular grip to change the pass-through point at the end of the curve. Moving the pass-through point also changes the radius.
To use grips to edit a free curve by radius
- In the drawing, click an alignment that has a free curve. Move any grip to modify the curve radius.
Grips for changing the curve radius:
- Use the grips to edit the curve:
- Move the circular grips along tangent entities to adjacent PC/PT points on the opposite end of the same tangent to create reverse or compound solutions.
Endpoint grips for dragging the beginning or end of the curve along the attachment entity:
- Move the circular, mid-point grip to modify the pass-through point and radius for the curve. Move the triangular grip to modify the radius for the curve while holding the pass-through point. By moving either of these grips, you can create a curve of less than or greater than 180 degrees.
Changing the radius to less than 180 degrees:
Changing the radius to greater than 180 degrees using the circular pass-through point grip:
Changing the radius to greater than 180 degrees using the triangular radius grip:
To use grips to edit a free curve with a pass-through point
- In the drawing, click an alignment with a free curve and a pass-through point.
Grips for a free curve with a pass-through point:
- Move the circular grip to change the pass-through point of the curve. This pass-through point is maintained when you edit the attached entities.
