pdr(3G) pdr(3G)
NAME
pdr, pdri, pdrs, pdr2, pdr2i, pdr2s - specifies the next point of a
polygon
C SPECIFICATION
void pdr(x, y, z)
Coord x, y, z;
void pdri(x, y, z)
Icoord x, y, z;
void pdrs(x, y, z)
Scoord x, y, z;
void pdr2(x, y)
Coord x, y;
void pdr2i(x, y)
Icoord x, y;
void pdr2s(x, y)
Scoord x, y;
All of the above routines are functionally the same. They differ only in
the type declarations of their parameters and in whether they expect a
two- or three-dimensional space.
PARAMETERS
x expects the x coordinate of the next defining point for the polygon.
y expects the y coordinate of the next defining point for the polygon.
z expects the z coordinate of the next defining point for the polygon.
DESCRIPTION
pdr specifies the next point of a polygon. When pdr is executed, it
draws a line to the specified point (x,y,z) which then becomes the
current graphics position. The next pdr call will start drawing from
that point. To draw a typical polygon start with pmv, follow it with a
sequence of calls to pdr and end it with pclos.
EXAMPLE
The following sequence draws a square:
pmv(0.0, 0.0, 0.0);
pdr(1.0, 0.0, 0.0);
pdr(1.0, 1.0, 0.0);
pdr(0.0, 1.0, 0.0);
pclos();
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pdr(3G) pdr(3G)
SEE ALSO
bgnpolygon, endpolygon, pclos, pmv, v
NOTES
pdr should not be used in new development. Rather, polygons should be
drawn using the high-performance v commands, surrounded by calls to
bgnpolygon and endpolygon.
There can be no more than 256 vertices in a polygon. Therefore, there
can be no more than 255 pdr calls between pmv and pclos.
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