Exchanging the ends of obstacles

After you select a linear obstacle, you can use the Exchange Ends command to move the pointer to the end opposite the current selection.

To move the pointer to the opposite end of a linear obstacle

1 Choose the obstacle toolbar button.

2 Select a segment or end of the linear obstacle by clicking on it with the left mouse button.

3 From the pop-up menu, choose Exchange Ends.

Moving segments

When you select a segment on an obstacle and attempt to move it, a vertex (a corner) is created. Use the Segment command to move entire segments without forming vertices. You can use this command to make obstacles larger or smaller.

To move a segment

1 Choose the obstacle toolbar button.

2 Select a segment, or side, of the obstacle.

3 From the pop-up menu, choose Segment.

4 Drag the segment to a new location. The segment moves, allowing you to extend or compress the entire side of the obstacle.

Creating circular obstacles

You can create circular shapes using the Arc command.

To create a circular obstacle

1 Choose the obstacle toolbar button.

2 From the pop-up menu, choose New.

3 Double-click at the point on the screen that you want to designate as the center of the arc. The Edit Obstacle dialog box appears.

4 From the Obstacle Type drop-down list, choose an obstacle type, edit other options in the dialog box as desired, then choose the OK button.

5 From the pop-up menu, choose Arc.

6 Drag the cursor to begin creating a circle.

7 Click the left mouse button to stop drawing.

Deleting obstacles

To delete an obstacle

1 Choose the obstacle toolbar button.

2 Press the C key and select an obstacle.

3 From the pop-up menu, choose Delete.