Representation Value/Gradual editor

Functionality

The Representation Value/Gradual editor allows you to change the representation of a map that uses a value domain or the image domain. In the Representation Value/Gradual editor, the values of the domain that uses this representation are called boundary values or limits. The general idea is that you insert limits, assign colors to limits and that you choose a coloring method for the values in between two limits.

To start the Representation Value/Gradual editor, see How to create a representation and How to edit a representation.

Note:

The functionality of the Representation Value/Gradual editor resembles the functionality of the ILWIS 1.4 Transfer Function program.

Parts of the Representation Value/Gradual editor:

The Representation Value/Gradual editor has a menu bar.
In the editor, you see values or percentages on the left, and colors on the right side of the window.

Percentages are shown when you create a new representation for a map using the system domain Value, or when you edit an existing representation gradual;
Values are shown when you create a new representation for a map with any value domain, except the system domain Value, or when you edit an existing representation value.

These values or percentages in the representation Value/Gradual editor are called boundaries or limits.

At the bottom, you see a color bar which gives an overview of how colors are assigned to the values of the domain.

Tip:

Maps which use system domain Value can only be shown with a representation gradual which works on percentages. When you want to create a representation value (working on values) for such maps, in order to assign specific colors to specific values, you need to change the domain of the map from system domain Value to a user-defined value domain. For more information, see How to change the domain of a map.

General working of the Representation Value/Gradual editor:

In general, in the representation Value/Gradual editor, you can:

insert and delete limits,
change the color assigned to limits,
change the value of limits,
change the coloring method of values in between two limits.

To change the color or the value of a limit:

double-click a limit, or
select a limit and press Enter on the keyboard, or
select a limit and, from the Edit Menu, choose Edit Limit.

In the appearing Edit Limit dialog box, you can select new color for this limit. You can also change the value or percentage of the limit.

To insert a limit:

press Ins on the keyboard, or
from the Edit Menu, choose Insert Limit.

In the appearing Insert Limit dialog box, you can fill in a new value (percentage or value) for the limit, and you can select a color for this limit.

To delete a limit:

select a limit and press Del on the keyboard, or
select a limit and, from the Edit Menu, choose Delete Limit.

To choose a coloring method for values/percentages in between two limits:

For values or percentages in between two limits there are three possibilities:

colors either range from the color of the limit below to the color of the limit above (stretch), or
they have the same color as the limit below (lower) or
they have the same colors as the limit above (upper).

To change the coloring of value/percentages in between two limits:

double-click in between two limits; this is a three-fold toggle: from stretch to upper to lower, or
select a limit or color and press Enter on the keyboard, or
select a line in between limits and from the Edit Menu, choose Edit Limit.

When starting from stretch:

one double-click results in a change to the color of the upper limit,
another double-click results in the color of the lower limit, and
yet another double-click results in stretch again.

To change the number of colors in between two limits:

from the Edit menu, choose Stretch Steps.

In the appearing Stretch Steps dialog box, enter a value for the number of colors that should be used in between two limits.

To interactively change colors of value maps:

Open a map with a value domain in a map window, open the map's representation by selecting the Representation command on the Edit menu of the map window;
The Representation Value/Gradual editor is opened; insert limits, edit colors, etc.;
Keep the editor open and switch to the map window;
Redraw the map window to apply the changes;
Continue editing colors and redrawing the map until satisfied.