Alan W. Irwin schrieb:
[...]
> Clearly, in the case of example 32 a circular symbol was meant.
> examples/python/test_circle.py contains a number non-unicode and unicode
> ways of generating such symbols. Example 1 and Example 6 show additional
> methods of generating circular symbols. I suggest example 32 be simplified
> to use one of those methods rather than using the local "plcircle" function
> that is currently implemented in x32c.c to duplicate that already-existing
> PLplot core functionality for generating circular symbols.
I agree. Here is the patch to use plpoin as in examples 1 and 6.
What gets lost, though, is the demonstration of how to get the axis
ratio for drawing custom symbols.
Robert
Index: examples/c/x32c.c
===================================================================
--- examples/c/x32c.c (revision 10006)
+++ examples/c/x32c.c (working copy)
@@ -58,6 +58,10 @@
static PLFLT uw[] = { 1.071, 1.062, 1.093, 1.045, 1.072,
1.067, 1.085, 1.024, 1.057, 1.071 };
+ /* outliers */
+ static PLFLT outx[] = { 3.5, 6.5 };
+ static PLFLT outy[] = { 0.89, 1.09 };
+
static PLFLT pos[] = {0.0, 0.25, 0.5, 0.75, 1.0};
static PLFLT red[] = {0.0, 0.25, 0.5, 1.0, 1.0};
static PLFLT green[] = {1.0, 0.5, 0.5, 0.5, 1.0};
@@ -91,8 +95,7 @@
}
/* some outliers */
- plcircle(3.5, 0.89);
- plcircle(6.5, 1.09);
+ plpoin(2, outx, outy, 20); /* small circle, see PLplot example 06 */
/* Don't forget to call plend() to finish off! */
@@ -179,33 +182,3 @@
pllsty(1);
plline(2, barx, bary);
}
-
-void
-plcircle(PLFLT x, PLFLT y)
-{
- PLFLT vpxmin, vpxmax, vpymin, vpymax;
- PLFLT px, py;
- PLINT pxlen, pylen, pxoff, pyoff;
- PLFLT axisratio, pageratio, circleratio, rx, ry;
- int i;
- static PLFLT cx[31], cy[31];
-
- /* get circle axis ratio */
- plgvpw(&vpxmin, &vpxmax, &vpymin, &vpymax);
- axisratio = (vpxmax -vpxmin) / (vpymax -vpymin);
-
- plgpage(&px, &py, &pxlen, &pylen, &pxoff, &pyoff);
- pageratio = pxlen * 1. / pylen;
-
- circleratio = axisratio / pageratio;
-
- ry = 0.001;
- rx = circleratio * ry;
- for (i = 0; i <= 30; ++i) {
- cx[i] = x + cos(i / 30. * 2. * M_PI) * rx;
- cy[i] = y + sin(i / 30. * 2. * M_PI) * ry;
- }
-
- pllsty(1);
- plline(31, cx, cy);
-}
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