Edit mode is activated through the View->Edit Mode menu or by pressing the button on the left bar. You can edit such objects as raster and vector layers, and vector shapes. Modified layers in the layer list are marked with '*', and they are automatically saved in the database.
Raster layers can be selected by clicking the left mouse button on the workspace (unless they are covered by other layers) or by selecting them from the list of layers (Layer Manager tab). Then the list of layer properties will appear in the Inspector tab showing the name, description, type, palette and range of the palette of the layer. The name and description of the layer can be edited in all types of raster layers, while in case of rasters containing 8-bit and 16-bit data also the color palette and its range can be modified (Fig. 10). Predefined palettes are: in gray scale or inverted gray scale, spectral and hypsometric.
Fig. 10. Window for choosing the color scale and palette range of the raster layer.
Vector layers and shapes can be selected by clicking the left mouse button on the workspace (unless they are covered by other layers/shapes) or by selecting them from the list of layers and shapes: their properties appear in the Inspector tab showing the name, description, legend and number of shapes (the last is read-only mode). With regard to vector shapes you can edit the name, visibility level and, depending on the type of shape, its properties such as style and color of the edge/fill, etc. The latter features appear in the bottom bar below the workspace in a form of drop-down lists, edit fields or buttons.
Fig. 11. Selected vector shape (polygon) with handles.
After selecting the vector shape, node handles appear around its edges (Fig. 11). Each node can be moved with the mouse; you can also add or remove the existing nodes by holding the CTRL button. Moreover, selected shapes can be moved (see the respective cursors in the table 1).
Fig. 12. Adding and removing polygon nodes using mouse.
|Moving node points|
|Adding node points|
|Removing node points|
|Moving selected shapes|
Table 1. Mouse cursors during edition of a vector shape.
You can also edit manually the location of node points of the selected shape. After selecting the list of elements, a window with a list of points and their location will appear in the shape properties window (Fig. 13). The point order number corresponds to the node number. For comparison, you can activate the Shapes->Show Handle Labels option, then the order numbers of nodes will appear next to the handles.
Fig. 13. Editable list of node points of the selected shape.
Colors and edge styles as well as fill colors of the shape can be defined on the bottom toolbar (Fig. 11). To change the color of the border or fill of a given shape, click the appropriate box (Border/Line Color, Fill Color) on the bar. Then a dialog box will appear that allows you to select a color from one of the predefined color palettes, either in RGB/HSV modes, or choose a color according to Albert Munsell's classification (Fig. 14).
Fig. 14. Color selection dialog window: a) manual mode; b) Munsell's scale.
The program allows you to use text labels. In edit mode you can change their attributes such as: size, font color and style, rotation angle and text alignment (options available on the bottom toolbar). The text is aligned with the insertion point (node), with possible values such as: centering, right alignment and left alignment. The program also allows you to manually rotate the text label with the mouse (Fig. 15).
Fig. 15. Rotating the text label of the center alignment using the mouse.
Selected shapes can be cut, copied to the clipboard, pasted and deleted. These options are available in the Edit menu, on the upper bar of the program window (buttons , , , and respectively) and through standard keyboard shortcuts. Selected shapes can also be moved to the top of the layer or to the bottom of other shapes of a given layer - menu Shapes->Bring to Front/Send to Back.
The program also allows you to add new shapes on the selected layer - through the Shapes->Add Shape menu or by pressing an appropriate button on the left bar. Currently, you can add: symbols (icon ), points (icon ), polylines (icon ), polygons (icon ), and text labels (icon ), by clicking on the point where a new node should appear; the operation of adding node points can be terminated by pressing ESC. With regard to polylines and polygons, they can be converted to each other. Moreover, selected polyline can be divided into shorter ones cutting it by line at any angle, using knife tool (Shapes->Knife, icon ).
You can also highlight a group of shapes. After selecting the Shapes->group Shapes menu (icon on the left bar), use the mouse to select the area containing shapes of the current layer to be highlighted. The entire shapes within this area will be marked in red against the gray background of the other layers (Fig. 16).
Fig. 16. Group of highlighted polylines (rivers) within the selected area.
The group thus marked can be cloned into a new layer (icon on the bottom bar), and the visual features of these shapes can be edited collectively (icon ) by changing the characteristics of the selected shapes (Fig. 17). It is possible to undo the last stage of editing the visual features of the group.
Fig. 17. Editing visual attributes of the group. The color and style of the polygon edges have changed.
For vector layers, you can edit the legend associated with the layer. In the list of layers, select the desired layer, and then call the Legend item from the Inspector tab. The legend item editor window will appear, allowing you to add, remove and move the order of selected items (Fig. 18). The editor allows you to insert symbols, shapes (linear and rectangular) and texts into the legend.
Fig. 18. Legend items editor.
Elements of the legend associated with a given layer are visible in the preview mode on the Legend tab.Contents