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2.1 Construction / Drawing

Polygons , Polylines , and Point Clouds are constructed by placing successive vertices into the drawing area via left-button mouse clicks. For polygons and point clouds, the first-placed vertex is marked with a blue square, denoting the anchor for completing the geometric shapes. For polylines, the last-placed vertex denotes the anchor for shape completion. To finalize the construction of an object, click on this anchor vertex. During construction, a separate Information label in the interface warns against incomplete geometry.

Newly constructed objects assume the color scheme (fill and outline), which was active on the first-placed vertex. Object colors can be changed at any point after completed construction.

Figure 1.6: Polygon: blue anchor completes geometry
Once polygons and polylines are completed, their vertices are marked with dark yellow squares. Vertices can be moved independently and in sets.

By default, all existing vertices (from polygons, polylines, and point clouds) act as snap magnets for the drawing cursor. Therefore, during construction of a new object, it is easy to perfectly align it with existing shapes. When Grid Snap is enabled, the drawing cursor also snaps to the gray grid points in the drawing area.

Figure 1.7: Polygon and polyline vertices marked with yellow squares

2.2 Selection

FTI Editor features several tools for selecting objects and vertices.

The object selector can be used to individually select shapes by clicking on the object of interest, or select shapes by drawing a marquee over an area. During individual selection, moving the mouse cursor near or over an object highlights the shape and readies it for selection (mouse click). During group selection via marquee, all shapes that partially or fully intersect with the marquee are added to the selection.

Figure 1.8: Individual Object Selection
Figure 1.9: Set of Object Selection with Marquee
Individual and group object selection is also possible via the ordered geometry list. Selected objects are displayed with a dashed outline.

Figure 1.10: Individual Object Selection via Geometry List
The vertex selector can be used to select individual vertices or sets of vertices. During individual vertex selection, the mouse cursor changes its appearance to a red square when it is moved near or over a vertex, signaling that a mouse click will select the vertex. Similar to the marquee operation on objects, a marquee over a set of vertices selects all vertices that intersect with the marquee. Selected vertices are marked with a red square.

Figure 1.11: Individual Vertex Selection
To unselect all presently selected objects and vertices, click on the Unselect All tool button.

2.3 Editing

Objects can be moved, scaled, and copied, whereas vertices can only be moved. Once objects or vertices are selected, there exist several move-transform modes:

Unit movement via keyboard cursors is available during object/vertex selection mode and while the Move tool is actively selected. A unit move via cursor operation displaces the selected geometry by one screen pixel. Depending on the size of the FTI Editor frame, a screen pixel can correspond to more or less than an icon unit (recall that an FTI icon's dimensions are 100.0 * 100.0). Assuming that the drawing area is much larger than the icon's native 100.0 * 100.0 size, a screen pixel move translates to a fraction of an icon unit move.

Free movement via mouse drag is available only while the Move tool is selected. All selected geometry is moved during a mouse click-and-drag operation, regardless of where the mouse cursor is located on the drawing area during the click.

Precise movement and object/vertex alignment is achieved by using various magnet and snap features while the Move tool is actively selected. While moving the mouse cursor over the drawing area, the mouse cursor snaps to existing vertices on selected and unselected geometry. When Grid Snap is enabled, the cursor also snaps to the gray grid points. Once the mouse cursor snaps to a vertex or a grid point, click-and-drag operations are performed with respect to that point. While dragging an object/vertex, the drag point, too, snaps to other existing vertices and grid points, therefore perfectly aligning vertices.

Figure 1.12: Precise Move with Vertex Snap
Object scaling is performed with respect to a pivot point, which is marked as a green cross in the drawing area. When the Scale tool is active, selected geometry can be scaled by mouse click-and-drag. A set of selected objects is scaled similarly, ensuring that the same scale is applied uniformly.

The pivot point is essential for object scale transformations. Scaling is performed with respect to the pivot point. The pivot is represented by a green cross in the drawing area. It can be moved via the Pivot tool by mouse click or mouse click-and-drag. The pivot automatically snaps to existing vertices. When Grid Snap is enabled, the pivot also snaps to the grid points.

Figure 1.13: Object Scaling
Objects can be copied and reused as transformed (moved, scaled) geometry in the icon. Objects can be selected using the Select tool or the Geometry list. Copying the set of selected objects is initiated via the Edit -> Copy Geometry menu option. Once copied, the new objects are coincident with the original ones, the new original objects are unselected, and the copied ones are selected and are ready to be moved or scaled.

Existing edges of polygons and polylines can be simplified by removing vertices or further subdivided by adding vertices. To remove one or more vertices from one or more objects, select the vertices of interest using the Select Vertex tool, then hit "Del" on the keyboard, or click on the Delete tool .

To add a vertex to an object's edge, select the Insert Vertex tool , then move the mouse cursor near or over the edge of interest. The mouse cursor will snap to a point on the nearest edge; moving the mouse cursor along that edge further focuses the location of the new vertex. Via mouse click, the new vertex is inserted on the edge.

Figure 1.14: Add Vertex
Individual objects can be labeled with names or comments individually or in sets. Once selected, use the Geometry Label textfield to label the objects and hit Enter to save the labels. The Geometry List reflects the changes immediately.

Figure 1.15: Label Object
The order of geometry can be changed to bring objects to the foreground and send objects to the background. The Geometry List provides tools to move individual or sets of selected geometry to the background () or to the foreground (). A second set of buttons (, ) moves all selected objects (even if not a continuous selection in the list) to the very top/bottom of the list, while maintaining their relative order.

Figure 1.16: Reorder Geometry