[Gnuplot-bugs] perspective 4.1 forward-port Was: {Re: [Gnuplot-info] Using gnuplot from inside data space}

[Alessandro S. <asa...@ju...>]

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I attach the perspective patch for 4.1 i made some days ago but on a
not so recent cvs snapshot. I did nothing more than applying the 4.0
patch by Andras Barta manually because it had no context. sorry i have
really no time to test it on the current cvs... above all i have no
cvs access from here, as the port is blocked.

The only point which is obscure to me is this chunk of util3d.c i
hacked with no knowledge of what i was doing (because of the
introduction of the define WITH_IMAGE in 4.1):

@@ -1029,6 +1033,15 @@
     if (w == 0)
        w = 1e-5;

+#ifdef PERSPECTIVE
+#ifdef WITH_IMAGE
+    *xt = ((res[0] * xscaler / w) + xmiddle) *
perspective_eye_distance /
(perspective_eye_distance+perspective_graph_distance-res[2])) + xmiddle);
+    *yt = ((res[1] * yscaler / w) + ymiddle) *
perspective_eye_distance /
(perspective_eye_distance+perspective_graph_distance-res[2])) + ymiddle);
+#else
+    *xt = (unsigned int) (((res[0] * xscaler / w) *
perspective_eye_distance /
(perspective_eye_distance+perspective_graph_distance-res[2])) + xmiddle);
+    *yt = (unsigned int) (((res[1] * yscaler / w) *
perspective_eye_distance /
(perspective_eye_distance+perspective_graph_distance-res[2])) + ymiddle);
+#endif
+#else
 #ifdef WITH_IMAGE
     *xt = ((res[0] * xscaler / w) + xmiddle);
     *yt = ((res[1] * yscaler / w) + ymiddle);
@@ -1036,6 +1049,8 @@
     *xt = (unsigned int) ((res[0] * xscaler / w) + xmiddle);
     *yt = (unsigned int) ((res[1] * yscaler / w) + ymiddle);
 #endif
+#endif
+
 }

 #endif /* REPLICATE_CODE_FOR_BACKWARD_COMPATIBLE_ROUNDING */

i help this can help, but please if there's any problem with that I
have unfortunately no time until the 23rd... as i'm really in a shit
crick and without paddles.

also, i have a request for a small feature: i'd like to have an
assionometric view switch rather than having to set a huge distance
for the eye as in this minimalistic patch...

cheers and thank you for your great work, gnuplot is always better and
better
alessandro salvatori

Hans-Bernhard Broeker wrote:

> Christopher John Muller wrote:
>
>> Is there an easy way that the viewing point and general direction
>> can be
>> specified,
>
>
> Not with any existing version. There's a patch that enables point
> perspective, IIRC, but guess even that won't discard data behind the
> viewer.
>
>
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