Using Polygon Zone Editing Tools

Atoll provides you with several different ways of editing the computation zone, focus zone, hot spots, and filtering zones. You can edit these zones by editing the points that define them, by combining several polygons, or by deleting parts of the poly- gons that make up these zones. When you no longer need the zone, you can delete it from the map.

The computation, focus and hot spot polygons can contain holes. The holes within polygonal areas are differentiated from overlaying polygons by the order of the coordinates of their vertices. The coordinates of the vertices of polygonal areas are in clockwise order, whereas the coordinates of the vertices of holes within polygonal areas are in counter-clockwise order. In this section, the following are explained:

• "Editing Polygon Zones" on page 36 • "Removing a Polygon Zone" on page 38.

1.4.10.4.1

Editing Polygon Zones

Atoll enables you to edit a polygon zone in several different ways. The first step in editing a polygon zone is selecting it, either by:

• Selecting the polygon zone in the Zones folder of the Geo tab of the Explorer window • Selecting the polygon zone by clicking it on the map, or

• Selecting the polygon zone from the list in the Vector Editor toolbar.

Once you have selected the polygon zone, you can edit it as explained in the following sections: • "Editing the Points of a Polygon Zone" on page 36

• "Editing Polygon Zones Using the Toolbar" on page 37 • "Editing Polygon Zones Using the Context Menu" on page 37.

Editing the Points of a Polygon Zone

To edit a point of a polygon zone:

1. Put the polygon zone in editing mode as explained in "Editing Polygon Zones" on page 36. 2. Select the polygon zone. You can now edit it by:

- Moving a point:

i. Position the pointer over the point you want to move. The pointer changes ( ). ii. Drag the point to its new position.

- Adding a point to the polygon zone:

i. Position the pointer over the polygon zone border where you want to add a point. The pointer changes ( ). ii. Right-click and select Insert Point from the context menu. A point is added to the polygon zone border at the

position of the pointer.

- Deleting a point from a polygon zone:

You can save the focus zone or hot spot, so that you can use it in a different Atoll docu- ment, in the following ways:

• Saving the focus zone in the user configuration: For information on saving the focus zone in a user configuration, see "Saving a User Configuration" on page 76. • Exporting the focus zone or hot spots: You can export the focus zone or hot spots

by right-clicking the Focus Zone or the Hot Spots folder on the Geo tab of the Explorer window and selecting Export from the context menu.

i. Position the pointer over the point you want to delete. The pointer changes ( ). ii. Right-click and select Delete Point from the context menu. The point is deleted.

Editing Polygon Zones Using the Toolbar

In Atoll, you can create complex polygon zones by using the tools on the Vector Editor toolbar. The filtering, computation, and focus zone polygons can contain holes. The holes within polygonal areas are differentiated from overlaying polygons by the order of the coordinates of their vertices. The coordinates of the vertices of polygonal areas are in clockwise order, whereas the coordinates of the vertices of holes within polygonal areas are in counter-clockwise order.

To edit a polygon zone using the icons on the Vector Editor toolbar:

1. Put the polygon zone in editing mode as explained in "Editing Polygon Zones" on page 36. 2. Click the contour to edit. The Vector Editor toolbar has the following buttons:

- : To combine several polygon zones:

i. In the Vector Editor toolbar, click the Combine button ( ).

ii. Click once on the map where you want to begin drawing the new polygon zone.

iii. Click each time you change angles on the border defining the outside of the polygon zone. iv. Double-click to close the polygon zone.

v. Draw more polygon zones if desired. Atoll creates a group of polygons of the selected and new contours. If polygon zones overlap, Atoll merges them.

- : To delete part of the selected polygon zone:

i. In the Vector Editor toolbar, click the Delete button ( ).

ii. Draw the area you want to delete from the selected polygon zone by clicking once on the map where you want to begin drawing the area to delete.

iii. Click each time you change angles on the border defining the outside of the area. iv. Double-click to close the area. Atoll deletes the area from the selected contour. - : To create a polygon out of the overlapping area of two polygons:

i. In the Vector Editor toolbar, click the Intersection button ( ).

ii. Click once on the map where you want to begin drawing the polygon that will overlap the selected one. iii. Click each time you change angles on the border defining the outside of the polygon.

iv. Double-click to close the polygon. Atoll creates a new polygon of the overlapping area of the two polygons and deletes the parts of the polygons that do not overlap.

- : To split the selected polygon into several polygons: i. In the Vector Editor toolbar, click the Split button ( ).

ii. Click once on the map where you want to begin drawing the polygon that will split the selected one. iii. Click each time you change angles on the border defining the outside of the polygon.

iv. Double-click to close the polygon. Atoll separates the area covered by the polygon from the selected polygon and creates a new polygon.

Editing Polygon Zones Using the Context Menu

When you are editing polygon zones, you can access certain commands using the context menu. To edit a polygon zone using the context menu:

1. Click the polygon zone you want to edit.

2. Right-click the polygon zone to display the context menu and select one of the following:

- Properties: Select Properties to open the Properties dialogue of the selected polygon zone. The Properties dia- logue gives the coordinates of each point that defines the position and shape of the polygon zone.

2. Click the Expand button ( ) to the left of Zones folder to expand the folder. 3. Right-click the folder containing the zone you want to remove.

4. From the context menu, select Delete Zone. The polygon zone is removed and all document data are now displayed.