Hi, I made the original post on plplot-general list, concerning the
difficulties encountered in extending the clipping region/disabling
clipping which gave rise to the discussion about the plgvpw adjustment,
so I come back to the clipping problem.
Actually, giving a deeper look at the code, I noticed that the
instruments for doing clip/unclip are already there, so I propose this
function for clipping/unclipping which makes in C a better job than what
I was trying to do in Fortran; I understand from the discussion that it
is unlikely that the plplot API may be extended, however I think that it
would be useful to have some kind of control on viewport clipping
without having to do many not so intuitive calls, so here is my proposal.
Best regards, and thank you for the discussion, Davide
#include "plplotP.h"
/*
Control viewport clipping state of current page/subpage
mode (PLINT, input)
0 restore clipping to previous state (makes sense if plsclip
has been previously called with mode = 1 or mode = 2 for the
current page/subpage, otherwise results are unpredictable)
1 disable clipping (clip area is now the whole viewport)
2 disable clipping (clip area is now the whole subpage)
*/
void c_plsclip(PLINT mode)
{
static PLINT crxmin=-1, crxmax=-1, crymin=-1, crymax=-1;
PLINT pxmin, pxmax, pymin, pymax;
if (mode == 0) {
/* uninitialised case, return */
if (crxmin == -1) return;
/* reset clip limits to original values */
plP_sclp(crxmin, crxmax, crymin, crymax);
} else if (mode == 1) {
/* disable clipping (clip area is now the whole viewport) */
/* remember original values */
plP_gclp(&crxmin, &crxmax, &crymin, &crymax);
/* get page physical limits */
plP_gphy(&pxmin, &pxmax, &pymin, &pymax);
/* set clip limits to physical limits */
plP_sclp(pxmin, pxmax, pymin, pymax);
} else if (mode == 2) {
/* disable clipping (clip area is now the whole subpage) */
/* remember original values */
plP_gclp(&crxmin, &crxmax, &crymin, &crymax);
/* get subpage limits */
pxmin = plsc->sppxmi; pxmax = plsc->sppxma;
pymin = plsc->sppymi; pymax = plsc->sppyma;
/* set clip limits to subpage limits */
plP_sclp(pxmin, pxmax, pymin, pymax);
}
}
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