To use grips to edit a profile in your drawing, follow these steps:
- Open the drawing named Graphical Editing.dwg located in the Chapter 07 class data folder.
- Click the blue Jordan Court FGCL profile to display its grips. Click the upright triangular grip located within the circle marked A1, and drag it to the center of the circle marked A2, as shown in Figure 7.3. This is an example of moving the PVI grip, which changes the slope of both tangents, maintains the length of the curve, and keeps the curve tangent at both ends.
Figure 7.3 Moving a PVI grip. - At the circle marked B1, click the triangle grip on the right and drag it to the center of the circle marked B2, as shown in Figure 7.4. This type of grip moves the PVI along the slope of one of the tangents.
Figure 7.4 Moving a tangent slope grip. - Click the square grip at the center of circle C1, and move it to the center of circle C2, as shown in Figure 7.5. This grip moves a tangent while keeping its slope constant. The result is that the PVIs at either end of the tangent are raised or lowered, and the curve geometry associated with them must update.
Figure 7.5 Moving a tangent midpoint grip. - Click the circular grip located at the center of circle D1, and move it to the center of circle D2, as shown in Figure 7.6. This is an example of moving the pass-through grip, forcing the curve to pass through a given point while adjusting the length of the curve.
Figure 7.6 Moving the pass-through point grip. - Click the circular grip at the center of circle E1, and move it to the center of circle E2, as shown in Figure 7.7. This is an example of moving the endpoint grip of the curve, which also moves the start point to adjust the length of the curve.
Figure 7.7 Moving the start point or endpoint grip.
Tips :For vertical curves, the curve length refers to the horizontal distance from the beginning of the curve to the end.
- Editing Profiles with Grips
- Editing Profiles Using the Profile Layout Tools
- Editing Profiles Numerically
Download Exercise File :