Initializing Logical Input Devices

For each of the input classes there is an initialization function which can change the values set as default by GKS for use in Request Mode (and which should be called after the mode has been set). The function calls are:

Initialize locator

CALL GINLC(...)

Initialize string

CALL GINST(...)

Initialize stroke

CALL GINSK(...)

Initialize valuator

CALL GINVL(...)

Initialize choice

CALL GINCH(...)

Initialize pick

CALL GINPK(...)

For all the input classes the echo area can be changed (i.e. the portion of the display surface where the prompt appears and which can accept input from the operator). For Locator and Stroke input the initialization function sets the initial normalization transformation and the initial locator position. The initialization functions also select the required prompt/echo type.

A detailed description of the initialization functions is outside the scope of this Primer, so those readers who wish to dig somewhat deeper should consult the reference manual for the GKS implementation being used. An example using GKSGRAL may be found in Appendix on Page ).