HDevelop User's Manual

50 CHAPTER 2. GRAPHICAL USER INTERFACE
immediately in the operator window. If there are several matching results, a combo box opens
and displays all operators containing the specified substring. By clicking the left mouse button
you select one operator and the combo box disappears. Now the operator’s parameters are
shown in the operator window.
Figure 2.34: Operator selection in the operator name field.
If you are already more familiar with HDevelop, it is reasonable to select an operator in the
operator name field. However, in order to do so, you obviously have to be familiar with the
operator names.
2.5.2 Parameter Display
The parameter display is the main part of the operator window. It is empty in its initial state.
If you have selected an operator, HDevelop displays the operator’s parameter data, i.e., name,
number, type, and default values, in the display.
¯ In the first column of the operator window you find the parameter names.
¯ The second column consists of the text fields, which contain variable names in case of
iconic and control output parameters and expressions in case of control input parameters.
If you want to change the suggestions offered by the system (variable names or default
values) you may do so either manually or by pressing the arrow button connected with the
respective text field. This opens a list containing a selection of already defined variables
and other reasonable values from the operator knowledge base. By clicking the appropriate
item you set the text field and the list disappears.
¯ The third column indicates the parameter’s default type in parentheses. This is a raw hint
for the user, what types of data have to be specified for each operator.
HDevelop / 2000-11-16