Vector Graphics Sections

The file parser starts a vector graphics section by calling the SOPutSectionType function with the SO_VECTOR value while processing the VwStreamSectionFunc function. The file parser must also set the vector header by using the SOPutVectorHeader function before returning from VmStreamSectionFunc. The information in the SOVECTORHEADER structure defines the size and attributes of the rectangle in which vector graphics are drawn.

The vector graphics functions are similar to the primitive GDI functions, but they include extensions that are based on the file formats being supported. All vector graphics objects are described in two-dimensional space on a logical coordinate system. The direction and resolution of the x- and y-axis is defined in SOVECTORHEADER.

The file parser uses two functions to transfer data. The SOVectorAttr function sets attributes related to drawing vector graphics objects, and the SOVectorObject function defines a vector graphics object to be drawn. The parser specifies an identifier, a data size, and the address of data when it calls a function. The identifier specifies the action to take and the size and data-defined details of the action. Each action has a corresponding structure in which the data must be given. For example, to define a logical font, the parser must set the members of the SOLOGFONT structure and pass the structure to SOVectorAttr.

Although vector graphics functions are similar to the graphics device interface (GDI) functions, they are not exactly the same. This means, for example, that the members of the SOLOGFONT and LOGFONT structures are not necessarily the same.

The file parser should call the SOPutBreak function with the SO_VECTOROBJECTBREAK value after drawing every object.

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