Serves for measuring lengths and areas in displaying pane of map browser window.
The window is opened automatically when the mode Ruler is selected and it is closed when any other mode is chosen.
When working in the mode Ruler the user can build an arbitrary polyline (a broken line) in displaying pane, the window “Ruler” will display lengths of polyline segments and their slope angles towards the horizontal axis and also the total length of this polyline and the sum of lengths of all built polylines. To do this it is necessary to move the cursor by polyline vertices clicking in every vertex. Building a polyline is completed by a double click in the last vertex.
When the box Autocomplete is checked, the system builds polygons instead of polylines which allows measuring areas of polygons apart from lengths of edges and perimeter value.
List of vertices | Shows a list of built polyline vertices. The last row is occupied by the point in which the cursor is placed. For every point its serial number is indicated, X and Y coordinates, length of segment from the given point to next one and slope angle of this segment towards the horizontal axis. |
Length | Shows the current value of length of the polyline connecting the built vertices. If the box Autocomplete is checked, calculation of length includes the segment connecting the first and last built vertices. The current cursor position is ignored. |
Current length | Shows the current value of length of the polyline connecting the built vertices and ending in the point where the cursor is located. If the box Autocomplete is checked, calculation of length includes the segment connecting the cursor position with the first built vertex. |
Total length | Shows the total value of lengths of all polylines built before plus the current length. |
Autocomplete | If this box is checked, the system always builds a closing segment connecting the cursor position with the first point of the list. |
Area | If the box Autocomplete is checked, it shows the current value of area of polygon built from vertices of the list. The current position of the cursor is ignored. |
Current area | If the box Autocomplete is checked, it shows the current value of area of polygon built from list of vertices based on the supposition that first and last built vertices are connected by segments with the point where the cursor is located. |
Total area | If the box Autocomplete is checked, it shows the total value of areas of all polygons built before plus the current area. |
Reset | Resets previously accumulated values of total length and total area to zero. Only current values of length and area are retained. |
 |  |
