im looking at one of the tutorials, under tutorials circle and line algorithms, vga trainer program, on this site. my question is, what include files do i use to make the c++ program work in his example?i included <iostream>, that fixed one error, but there are 2 more, `round`: undeclared identifier and 'Putpixel' : undeclared identifier. i believe there is a # include file for graphics or something to make it work.thanks
C++ itself does not include a graphics library - this is generally implementation specific.
What OS / Compiler are you using?
"Queen and huntress, chaste and fair,
Now the sun is laid to sleep,
Seated in thy silver chair,
State in wonted manner keep."
windows 2000 and ms visual studio 6
This topic is probably more relevant in the windows forum, however try
#include <windows.h>
I presume you are using the windows GDI - even so I would have expected more errors than this if you are writing a windows app and have not included windows.h already.
If you are still having problems could you post some code and just a description of what it is your trying to do.
"Queen and huntress, chaste and fair,
Now the sun is laid to sleep,
Seated in thy silver chair,
State in wonted manner keep."
<code>
# include<iostream>
int sgn (long a) {
if (a > 0) return +1;
else if (a < 0) return -1;
else return 0;
}
void Line(int a, int b, int c, int d, int col) {
long u,s,v,d1x,d1y,d2x,d2y,m,n;
int i;
u = c-a;
v = d-b;
d1x = sgn(u);
d1y = sgn(v);
d2x = sgn(u);
d2y = 0;
m = abs(u);
n = abs(v);
if (m<=n) {
d2x = 0;
d2y = sgn(v);
m = abs(v);
n = abs(u);
}
s = (int)(m / 2);
for (i=0;i<round(m);i++) {
Putpixel(a,b,col);
s += n;
if (s >= m) {
s -= m;
a += d1x;
b += d1y;
}
else {
a += d2x;
b += d2y;
}
}
}
</code>
I didn't read the whole code, but abs() is defines in cmath or math.h if you want...
and to use the tags you shoud use the squared brackets []...
none...
