HP b2600 Reference Manual page 144

E
glEvalMesh
and n, u
GL_POINTS if mode is GL_POINT, or GL_LINES if mode is GL_LINE. The one absolute
numeric requirement is that if i=n, then the value computed from i
In the two-dimensional case, glEvalMesh2, let
u = (u
v = (v
where n, u
command. Then, if mode is GL_FILL, the glEvalMesh2 command is equivalent to:
for (j = j1; j < j2; j += 1) {
for (i = i1; i
}
If mode is GL_LINE, then a call to glEvalMesh2 is equivalent to:
for (j = j1; j
}
for (i = i1; i i2; i += 1) {
}
And finally, if mode is GL_POINT, then a call to glEvalMesh2 is equivalent to:
glBegin(GL_POINTS);
for (j = j1; j
}
glEnd();
In all three cases, the only absolute numeric requirements are that if i=n, then the value
computed from i
+ v
Errors
•
144
, and u are the arguments to the most recent glMapGrid1 command. type is
1 2
u ) / n
2
v ) / m,
2 1
, u , m, v , and v
1 2 1
glBegin (GL_QUAD_STRIP);
i2; i += 1) {
glEvalCoord2(i u + u
glEvalCoord2(i u + u
}
glEnd();
j2; j += 1) {
glBegin(GL_LINE_STRIP);
for (i = i1; i i2; i += 1)
glEvalCoord2(i u + u
glEnd();
glBegin(GL_LINE_STRIP);
for (j = j1; j j1; j += 1)
glEvalCoord2(i u + u
glEnd();
j2; j += 1) {
for (i = i1; i i2; i += 1) {
glEvalCoord2(i u + u
}
u + u
is exactly v .
1 2
GL_INVALID_ENUM is generated if mode is not an accepted value.
are the arguments to the most recent glMapGrid2
2
, j v + v );
1 1
, (j + 1) v + v );
1 1
, j v + v );
1 1
, j v + v );
1 1
, j v + v );
1 1
is exactly u , and if j=m, then the value computed from j
1 2
u + u is exactly u .
1 2
v
Chapter 5