To permit convenient monitoring of certain triangle properties, the Editor can place coloured markers in triangles according to default colour tables or colour tables set up by the user. Solid colouring of triangles is also available. The Editor maintains a list of all triangles in the grid and this list and the calculated triangle properties are updated if necessary each time the colouring option is invoked; thus the effects on triangle properties of any editing of the grid can be checked immediately.
|
| When the TRIANGLES option in {TOP.TEST} is selected, a right-hand window appears with options for selecting the colouring mode and the type of test.
At the top, the colouring mode can be selected between Marker, None, or FullColour. Clicking on the mode type with the cursor toggles between these choices. Marker indicates that coloured markers will be placed in the triangles, while FullColour indicates solid colouring of triangles. Markers are preferable if editing ooperations are to be carried out on the grid. Next, picking SET CRITERIA will enable a selection between the tests listed in the window. Picking in EQL, DEP, A2D, CCW, G90, or COD determines which of the following internally-evaluated triangle properties is to be displayed: |
In addition, an external file (in EXTCRI format) containing a list of triangles and corresponding values of any quantity defined by the user can be read in, using option EXT.
After one of these options is chosen, the next step is to specify a colour table to use for translating values of the chosen criterion into appropriate colours. The default colour table, a preset colour table prepared by the user, or a colour table can be defined on the spot can be used. The first relevant prompt is:
Enter N for the default colour table, or Y to supply a user colour table. If Y is chosen, the next prompt is:
Y here means that a preset colour table is to be read in and the user is then prompted to enter the name of the file containing the required table. Entering N results in a series of prompts which lead the user through the process of setting up a colour table. The specification of colour tables is dealt with in a separate section below. Finally, when the required test has been completely set up the display can be redrawn with triangles coloured according to the chosen criterion.
For option {TOP.TEST}TRIANGLES the user sets up colour table(s) which assign colours to specific ranges of each numerical criterion. It is preferable to set up suitable colour tables before an editing session, but it is possible to set up a table during a session. In the present version of the Editor, a table defined during an editing session is not saved. A colour table consists of a set of upper limits of ranges of a numerical criterion together with the corresponding colours to be used for the different ranges. For instance, to check the mean depths of triangles in a basin whose depths range from 0 to 100m, the following table might be used:
In GSS*GKS, the colour codes and corresponding names are :
| Colour | Colour | ||
| black | dkgray(darkgray) | ||
| white | ltgray(lightgray) | ||
| red | pink | ||
| green | medgreen(lightgreen) | ||
| blue | ltblue(lightblue) | ||
| yellow | orange(mustard) | ||
| cyan | yelgreen(verylt.blue) | ||
| violet | vioblue(lightviolet) |
This means that, in this example, the triangles will be coloured according to mean depth as follows:
The same colour may be used for different ranges, as for example above, where depths beyond either end of the expected range will be coloured red. Colour code 0 means that no colouring is done and time can be saved by using this for the criterion range to which the greatest number of triangles are likely to belong. If the above colour table is to be read in from a prepared file, the contents of the file, which must be set up before the editing session begins, should be as follows (free format):
2 0. 0 10. 6 25. 4 50. 5 100. 2 9999
On opting to enter a colour table manually, the user will be prompted to supply the numerical color code and upper limit for each range in turn. The successive entries required to define the sample colour table discussed above would be:
Colour tables may be set up at the same time for all the available tests; the colour shading displayed immediately after entry of colour tables corresponds to the last test and colour table set up. Once a colour table has been set up for a given criterion, colour shading according to this table can be invoked at any time, without need for further entry of colour information, by answering "N" when the prompt "Change the colour scale?" appears. Where colour tables have already been set up for two or more criteria, it is possible to colour according to any one of these criteria, without entering further colour data, by answering "Y" to the prompt "Change criterion?", entering the 3-character code for the criterion required, and then entering "N" in response to the subsequent prompt "Change colour scale?"
Next: Sub-Menu CHECKNODES
Up: Contents Of Sub-menu {TOP.TEST}
Previous: Sub-option VERTICES
