GDDM V3R2 Base Application Programming Reference
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GDF order descriptions

GDDM V3R2 Base Application Programming Reference
SC33-0868-02
Graphics data format (GDF) is a means of storing pictures. GDDM uses it internally, and also makes it available to application programs. It consists of a set of orders with similar meanings to the GDDM graphics call statements.
In many cases there is a one-for-one mapping between GDF orders and GDDM call statements.
GDDM supports a picture prolog that contains information about the size of the picture and the symbol sets used in the picture. A detailed description of the orders that relate to the picture prolog is given under "Picture prolog" in topic 10.10. The information the picture prolog provides is:
  • The coordinate type
  • The picture boundary
  • The picture scale and aspect ratio
  • The symbol sets that are referenced
  • The drawing defaults information.
The initial Comment order in the generated GDF is retained for compatibility with previous releases of GDDM.

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