Dear plplot maintainers,
I need to make big sized postscript plots with many details, and it is
not satisfactory just to zoom a small plot because many features (line
width, font sizes, etc.) have a default absolute size and look bad when
zoomed. On the other side I noticed that the ps driver has an hardcoded
physical page size (XSIZE, YSIZE in ps.h) which cannot be changed by the
user, as far as I know.
If this is true, then I propose a patch which could give the chance to
change the postscript page size with plspag through a combination of the
(xp,xleng) and (yp,yleng) parameters, currently unused for ps, so that
the page size in postscript points would be xleng*xp/72,yleng*yp/72. The
patch leaves the default behavior unchanged and does not change the
API, so I think its implementation would not break any existing
application and would have also the positive side effect to set xleng
and yleng for postscript (I remember the "Undistorted circles" thread
where these values were used to get the physical aspect ratio, see
http://www.mail-archive.com/[EMAIL PROTECTED]/msg00424.html
).
If you think there is something wrong, or the same result could be
achieved in a different way, please do it as you feel correct, but I
would really be interested to see such a feature in a future version of
plplot.
The patch applies to ps and psttf drivers, maybe other drivers could
benefit from such an approach?
I inline the patch since it is quite simple:
--- plplot-5.9.0/include/ps.h~ 2007-11-18 21:04:07.000000000 +0100
+++ plplot-5.9.0/include/ps.h 2008-12-02 12:29:02.000000000 +0100
@@ -10,8 +10,8 @@
#define LINELENGTH 78
#define COPIES 1
-#define XSIZE 540 /* 7.5 x 10 [inches] */
-#define YSIZE 720 /* (72 points = 1 inch) */
+#define XSIZE (int) (pls->xlength*(pls->xdpi/72.))
+#define YSIZE (int) (pls->ylength*(pls->ydpi/72.))
#define ENLARGE 5
#define XPSSIZE ENLARGE*XSIZE
#define YPSSIZE ENLARGE*YSIZE
--- plplot-5.9.0/drivers/ps.c~ 2007-11-18 21:04:11.000000000 +0100
+++ plplot-5.9.0/drivers/ps.c 2008-12-02 13:21:14.000000000 +0100
@@ -156,6 +156,14 @@
{
PSDev *dev;
+/* Set default values */
+ if (pls->xlength <= 0 || pls->ylength <=0) {
+ pls->xlength = 540;
+ pls->ylength = 720;
+ }
+ if (pls->xdpi <= 0) pls->xdpi = 72.;
+ if (pls->ydpi <= 0) pls->ydpi = 72.;
+
PLFLT pxlx = YPSSIZE/LPAGE_X;
PLFLT pxly = XPSSIZE/LPAGE_Y;
--- plplot-5.9.0/drivers/psttf.cc~ 2007-11-18 21:04:10.000000000 +0100
+++ plplot-5.9.0/drivers/psttf.cc 2008-12-02 13:20:59.000000000 +0100
@@ -195,6 +195,14 @@
PSDev *dev;
PostscriptDocument *doc;
+/* Set default values */
+ if (pls->xlength <= 0 || pls->ylength <=0) {
+ pls->xlength = 540;
+ pls->ylength = 720;
+ }
+ if (pls->xdpi <= 0) pls->xdpi = 72.;
+ if (pls->ydpi <= 0) pls->ydpi = 72.;
+
PLFLT pxlx = YPSSIZE/LPAGE_X;
PLFLT pxly = XPSSIZE/LPAGE_Y;
thank you and best regards, Davide
--
============================= Davide Cesari ============================
Servizio IdroMeteorologico ARPA Emilia Romagna
Area Modellistica Numerica e Radarmeteorologia
Phone/Fax: +39 051525926/+39 0516497501
E-mail: [EMAIL PROTECTED]
Home page: http://www.webalice.it/o.drofa/davide/
Address: ARPA-SIM, Viale Silvani 6, 40122 Bologna, Italy
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