Inside Macintosh: QuickDraw GX Printing Extensions and Drivers /

Chapter 4 - Printing Messages / Printing Messages Reference

Constants and Data Types for the Vector Imaging System

Vector Shape Structure

The vector shape structure, of data type gxVectorShapeDataRec, is used with the GXVectorVectorizeShape message, which is described on page 4-130.

struct gxVectorShapeDataRec {
   gxVectorShapeOptions    shapeOptions;
   long                    maxPolyPoints; 
   Fixed                   shapeError; 
   Fixed                   textSize;
   Fixed                   frameSize;  
};
typedef struct gxVectorShapeDataRec gxVectorShapeDataRec;

Field Description

shapeOptions

Options that you can include for rendering shapes into vectors. This value is the combined value of the constants that you include from the vector shape options enumeration, which is described in the next section.

maxPolyPoints

The maximum number of points that a polygon can contain for drawing on this device. If the value of this field is 0, QuickDraw GX converts polygons into vectors rather than sending polygons to the device.

shapeError

The maximum number of pixels by which the vectors created to approximate a curve can deviate from the original. The smaller this value, the more vectors are used to approximate each curve, which means more memory, but less deviation in shape. A value of 0x00002000 is typically used, which allows an error of no more than one 1/8 of a pixel at 72 dots per inch.

textSize

Any text above this size is filled, while any text below this size is outlined but not filled.

frameSize

Any shapes with frames larger than this size are filled, while shapes with any shapes with frames smaller than this size are stroked.

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