On 07/11/2022 5:48 AM, Joel wrote:
The algorithm is too hard for me to work out and dg2d doesn't help
either. I want my code fixed up so that works from any two points.
Its not as complex as that page initially looks.
```
plotLine(x0, y0, x1, y1)
dx = abs(x1 - x0)
sx = x0 < x1 ? 1 : -1
dy = -abs(y1 - y0)
sy = y0 < y1 ? 1 : -1
error = dx + dy
while true
plot(x0, y0)
if x0 == x1 && y0 == y1 break
e2 = 2 * error
if e2 >= dy
if x0 == x1 break
error = error + dy
x0 = x0 + sx
end if
if e2 <= dx
if y0 == y1 break
error = error + dx
y0 = y0 + sy
end if
end while
```
That is the pseudo code you want.
Its just a matter of typing the variables to something like int.
I can recommend:
https://www.amazon.com/Computer-Graphics-Principles-Practice-3rd/dp/0321399528
and
https://www.amazon.com/Computer-Graphics-C-Version-2nd/dp/0135309247
(The updated version should be fine too)
If you wish to understand it.
