Extend Polylines Command

In CivilGEO software, the Extend Polylines command allows the user to extend one or more selected polylines in order to intersect it with a drawn polyline or selected polylines or polygons.

The following example illustrates how the Extend Polylines command can be used to extend polyline B to meet polyline A.

This article explains how to use the Extend Polylines command.

From the Map Edit ribbon menu, select the Extend Polylines command and the Extend Polylines dialog box will be displayed.

The following sections describe how to use the Extend Polylines command and interact with the above dialog box.

Defining Extend Polylines

The Define Extend Polylines section allows the user to define the polylines (and polygons) that should be used in the Extend Polylines command. The user can define the polylines to be extended by either drawing a new extend polyline or by selecting the previously drawn polylines or polygons from the Map View.

Drawing Extend Polyline

The Draw extend polyline radio button option allows the user to interactively draw a single extend polyline on the Map View.

Follow the steps below to draw the extend polyline on the Map View:

1. Select the Draw extend polyline radio button option and then click the [Draw] button.
   
2. The Extend Polylines dialog box will temporarily disappear, and a prompt will be displayed on the status bar instructing the user what to do next.
3. Draw the extend polyline on the Map View. While drawing a polyline, the user can use the [Ctrl] key to switch between linear and curvilinear digitizing. Refer to this article in our knowledge base to learn more about drawing elements on the Map View.
4. After drawing the extend polyline, press the [Enter] key or right-click and select Done from the displayed context menu.
5. The dialog box will be redisplayed, and the status of the Draw extend polyline read-only field will be changed from Not Drawn to Drawn as shown below.
   

Selecting Extend Polylines/Polygons

The Select extend polylines/polygons radio button option allows the user to select one or more existing polylines or polygons from the Map View as extend polylines.

Follow the steps below to select the extend polylines/polygons from the Map View:

1. Choose the Select extend polylines/polygons radio button option and then click the [Pick] button.
   
2. The Extend Polylines dialog box will temporarily disappear, and a prompt will be displayed on the status bar instructing the user what to do next.
3. Select the extend polylines/polygons from the Map View.
4. After selecting the extend polylines/polygons, press the [Enter] key or right-click and select Done from the displayed context menu.
5. The dialog box will be redisplayed, and the total number of selected polylines/polygons will be shown in the Select extend polylines/polygons read-only field as shown below.
   

Selecting Polylines to Extend

The Select Polylines to Extend section allows the user to manually select the polylines to be extended from the Map View. Note that this section is enabled only when the user has defined extend polylines in the Define Extend Polylines section.

Follow the steps below to select polylines to be extended:

1. Click the [Pick] button.
   
2. The Extend Polylines dialog box will temporarily disappear, and a prompt will be displayed on the status bar instructing the user what to do next.
3. Select the polylines to be extended from the Map View.
4. After selecting the extend polylines, press the [Enter] key or right-click and select Done from the displayed context menu.
5. The Extend Polylines dialog box will be redisplayed, and the total number of selected polylines will be shown in the Extend polylines read-only field as shown below.
   
6. The user can click the [Clear] button to cancel all the previous selections and redo the entire process.

Extending Polylines

Once the data have been properly defined in the Extend Polylines dialog box, click the [OK] button. The software will extend the selected polylines along the defined clipping polylines or polygons.

Note that if the selected polylines to be extended do not intersect with the clipping polylines or polygons, the following informational dialog box will be displayed on clicking the [OK] button.