Titlebook: Computer Graphics Programming; GKS — The Graphics S Günter Enderle,Klaus Kansy,Günther Pfaff Book 1987Latest edition Springer-Verlag Berlin

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States and State Lists the values of the state variables contained in a number of state lists, present in a GKS system. When GKS functions are called this can change the values in the state lists: these changes are part of the definition of the functions.

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Error Handlingh is able to discover these errors and record at least one of the errors which have occurred in a message file. There the identification of the error and the identification of the GKS function detecting the error will be filed. The application program can replace the standard error handling procedur

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Inputrect manner and the instantaneous system response to these actions are truly adapted to the way humans deal with their environment. Interactive computer graphics makes such interactions possible. It is the most powerful instrument in adapting the humancomputer interface to human needs.

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Error Handlinge by its own routine which can react to specific errors. The user error procedure is supplied by GKS with the identification of both the error and the GKS routine which has detected it. It can also inspect the GKS state list by using inquiry functions.

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Teachware für Finanzdienstleisterting system functions. In addition, special application-dependent layers can be built on top of the GKS language layer. An example using an application layer for data representation graphics is shown in Figure C7 (page 620), while Figure C8 (page 621) shows a mapping application and Figure C3 (page 619) a CAD application.

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