Commit 10206 adds custom axis label support (the function
plslabelfunc, C only for now) to PLplot trunk. Commit 10207 updates
example 19 (also C only for now) to use plslabelfunc for specialized
longitude and latitude axis labels. The function is simplified from
what I originally proposed, based on comments from others on the list:
void plslabelfunc(void (*label_func)(PLINT, PLFLT, const char *,
PLPointer), PLPointer label_data);
where label_func arguments would be:
void label_func(PLINT axis, PLFLT value, const char *label, PLPointer data);
label_func should create a string with the desired label text (based
on the value in the "axis" argument) and set "label" to point to that
string. "label_data" from plslabelfunc is passed to each call of
label_func as "data". "axis" could be changed to take an enumeration
of some sort rather than #define'd constants if that would be
considered better. For now, I have added PL_X_AXIS, PL_Y_AXIS and
PL_Z_AXIS to plplot.h with appropriate values. Named integer
constants seem to be used in PLplot over enums, so I was going largely
by precedent in this choice.
I also added, per Steve's request, support for custom placement of the
"(x10^n)" axis scaling text. I have not committed an example to svn
to demonstrate this, but I do have a patch for example 1 which
demonstrates this (see the attached patch). If no custom labeling
function is provided, one can provide a struct with information on how
to position the axis multiplier text. If others think this is worth
including this update to example 1 I will commit it. It is a very
subtle visual change, so I didn't want to be overly invasive with
these updates.
While I am reasonably happy with the axis labeling implementation, I
am less happy with the implementation of the customized (x10^n)
multiplier positioning - it feels inelegant and inflexible to me.
Improvements, or suggestions for improvements, are welcome.
Hez
--
Hezekiah M. Carty
Graduate Research Assistant
University of Maryland
Department of Atmospheric and Oceanic Science
diff --git a/examples/c/x01c.c b/examples/c/x01c.c
index f9b30d1..8e0dc0c 100644
--- a/examples/c/x01c.c
+++ b/examples/c/x01c.c
@@ -217,6 +217,7 @@ plot1(int do_test)
{
int i;
PLFLT xmin, xmax, ymin, ymax;
+ PLLabelDefaults label_opt;
for (i = 0; i < 60; i++) {
x[i] = xoff + xscale * (i + 1) / 60.0;
@@ -233,13 +234,20 @@ plot1(int do_test)
ys[i] = y[i * 10 + 3];
}
+ label_opt.exp_label_disp = 0.15;
+ label_opt.exp_label_pos = -0.07;
+ label_opt.exp_label_just = 1.0;
+
/* Set up the viewport and window using PLENV. The range in X is
* 0.0 to 6.0, and the range in Y is 0.0 to 30.0. The axes are
* scaled separately (just = 0), and we just draw a labelled
* box (axis = 0).
+ * Also enable custom placement of the exponential label.
*/
plcol0(1);
+ plslabelfunc(NULL, &label_opt);
plenv(xmin, xmax, ymin, ymax, 0, 0);
+ plslabelfunc(NULL, NULL);
plcol0(2);
pllab("(x)", "(y)", "#frPLplot Example 1 - y=x#u2");
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