pRatio (PBYTE) - input
Pointer
to two unsigned bytes corresponding to the aspect of the pels on which a
line is drawn. The style ratio is defined as a two-byte value. The low-order
byte indicates a step in the X-direction, and the high-order byte a step
in the Y-direction. Typical values for style ratios are:
- For EGA devices, X-direction equals 64 and Y-direction
equals 85.
- For one-to-one devices, X-direction equals 64 and
Y-direction equals 64. In this case, the style ratio steps are set to 64:64
rather than 1:1 to ensure that a single dot in a line-style pattern is a
sensible length. The length of a single dot in the pattern is (256/step_value)
pels.
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