[PROJ] Migrating from PROJ 7 to 8

[Thomas Knudsen]

Torsten,

I believe you will find the answer over at
https://proj.org/development/quickstart.html

Where you a.o. will find this example:

    b = proj_trans(P, PJ_FWD, a);

/Thomas

Den tor. 12. maj 2022 kl. 12.07 skrev Torsten Martinsen via PROJ <
proj at lists.osgeo.org>:

> Hi,
>
> I have some code (written by a previous coworker) that uses the functions
> pj_ctx_alloc(), pj_init_plus_ctx(), and pj_fwd(). These have been
> deprecated for some time and were removed in PROJ 8.
>
> I have searched the documentation etc., and while it is quite simple to
> figure out the current equivalents for the two first functions, I cannot
> figure out the replacement for pj_fwd().
>
> For reference, the code in question is in essence:
>
> void projection::forward(double& x, double&y) const
> {
>    projUV p;
>    p.u = x * geo::deg_to_rad;
>    p.v = y * geo::deg_to_rad;
>    p = pj_fwd(p, proj_);
>    x = p.u * geo::rad_to_deg;
>    y = p.v * geo::rad_to_deg;
> }
>
> where 'proj_' is returned from pj_init_plus_ctx().
>
> Regards,
> Torsten Martinsen
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