NAME¶
wxGUI.Vector_Digitizer
DESCRIPTION¶
The
vector digitizer is a
wxGUI component intended for interactive
editing vector maps (see
v.edit for non-interactive vector editing
GRASS capabilities).
The digitizer supports editing of 2D vector features (points, lines, centroids,
boundaries, and area). Vector features can be selected using mouse or by query
(e.g. minimal vector line length). Vector features can be selected by bounding
box or simply by mouse click (based on 'Settings->General->Select
threshold' value).
Vector digitizer can be activated from Main toolbar in Map Display by selecting
"Digitize" from "Tools" combobox. Vector map to be edited
can be afterwards selected from digitizer toolbar ("Select vector
map" combobox, note that only vector maps from the current layer tree in
Layer Manager are available). Vector digitizer can be alternatively also
activated from contextual menu in Layer Manager by selecting "Start
editing" on selected vector map in the layer tree.
New vector map can be easily created from digitizer toolbar by selecting
"New vector map" in "Select vector map" combobox. A new
vector map is created, added to the current layer tree in Layer Manager and
opened for editing. "Select vector map" combobox in digitizer
toolbar also allows switching easily between vector maps to be edited.
The wxGUI vector digitizer draws all maps in the Layer Manager in the Map
Display window; in addition, the digitizer also recognizes a special
"background" vector map. This map is selected from the Layer Manager
by right-clicking on the map and selecting "Use as Background Map"
from the contextual menu. The features of the background map may then be
copied into the currently edited vector map using the "Copy features from
(background) vector map" button in the "Additional Tools" menu
on the Digitzer Toolbar.
- Digitize new point
-
Add new point to vector map and optionally define its attributes.
- Digitize new line
-
Add new line to vector map and optionally define its attributes.
- Digitize new boundary
-
Add new boundary to vector map and optionally define its attributes.
- Digitize new centroid
-
Add new centroid to vector map and optionally define its attributes.
- Digitize new area
-
Add new area (closed boundary and one centroid inside) to vector map and
optionally define its attributes.
- Move vertex
-
Move selected vertex of linear feature. Thus shape of linear feature is
changed.
- Add vertex
-
Add new vertex to selected linear feature (shape not changed).
- Remove vertex
-
Remove selected vertex from linear feature. Thus shape of selected feature
can be changed.
- Edit line/boundary
-
Edit selected linear feature, add new segments or remove existing segments
of linear feature.
- Move feature(s)
-
Move selected vector features. Selection can be done by mouse or by
query.
- Delete feature(s)
-
Delete selected vector features (point, line, centroid, or boundary).
Selection can be done by mouse or by query.
- Display/update categories
-
Display categories of selected vector feature. Category settings can be
modified, new layer/category pairs added or already defined pairs
removed.
- Display/update attributes
-
Display attributes of selected vector feature (based on its category
settings). Attributes can be also modified. Same functionality is
accessible from Main toolbar "Query vector map (editable
mode)".
- Additional tools
- Break selected lines/boundaries at intersection
Split given vector line or boundary into two lines on given position (based
on v.clean, tool=break).
- Connect two selected lines/boundaries
Connect selected lines or boundaries, the first given line is connected to
the second one. The second line is broken if necessary on each
intersection. The lines are connected only if distance between them is not
greater than snapping threshold value.
- Copy categories
Copy category settings of selected vector feature to other vector features.
Layer/category pairs of source vector features are appended to the target
feature category settings. Existing layer/category pairs are not removed
from category settings of the target features.
- Copy features from (background) map
Make identical copy of selected vector features. If a background vector map
has been selected from the Layer Manager, copy features from background
vector map, not from the currently modified vector map.
- Copy attributes
Duplicate attributes settings of selected vector feature to other vector
features. New category(ies) is appended to the target feature category
settings and attributes duplicated based on category settings of source
vector features. Existing layer/category pairs are not removed from
category settings of the target features.
- Feature type conversion
Change feature type of selected geometry features. Points are converted to
centroids, centroids to points, lines to boundaries and boundaries to
lines.
- Flip selected lines/boundaries
Flip direction of selected linear features (lines or boundaries).
- Merge selected lines/boundaries
Merge (at least two) selected vector lines or boundaries. The geometry of
the merged vector lines can be changed. If the second line from two
selected lines is in opposite direction to the first, it will be flipped.
See also module v.build.polylines.
- Snap selected lines/boundaries (only to nodes)
Snap vector features in given threshold. See also module v.clean.
Note that this tool supports only snapping to nodes. Snapping to vector
features from background vector map is not currently supported.
- Split line/boundary
Split selected line or boundary on given position.
- Query tool
Select vector features by defining a threshold for min/max length value
(linear features or dangles).
- Z-bulk labeling of 3D lines
Assign z coordinate values to 3D vector lines in bounding box. This is
useful for labeling contour lines.
- Settings
-
Dialog for vector digitizer settings.
- Quit digitizing tool
-
Changes in vector map can be optionally discarded when digitizing session is
quited.
NOTES¶
- Mouse button Functions:
-
- Left - select/deselect features
- Control+Left - cancel action/undo vertex
- Right - confirm action
Dead (deleted) are internally only marked in the geometry file as 'dead'
but it remains there and occupies space. Any vector module used afterwards on
this vector map which really reads and writes vector geometry (so not
g.copy) will writes only features which are 'alive'.
Added or modified vector features are
snapped to existing vector
features ('Settings->General->Snapping', nodes or vertices) based on
'Settings->General->Snapping threshold' value. To disable snapping set
the snapping threshold to '0'.
If the digitizer crashes for some reason you can repair the vector map which was
left open with the
v.build module.
Please note that vector digitizer is under active development and
distributed as "Experimental Prototype".
SEE ALSO¶
wxGUI
Other wxGUI components:
Attribute Table Manager
3D Viewer
Graphical Modeler
Manage Ground Control Points
Cartographic Composer
v.edit, v.category
See also wxGUI digitizer wiki page and Vector related wiki page.
AUTHORS¶
FBK-irst (2007-2008), Trento, Italy, and Czech Technical University in Prague,
Czech Republic
$Date: 2012-01-20 19:44:22 +0100 (Fri, 20 Jan 2012) $
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