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-rw-r--r--flam3.c6
-rw-r--r--flam3.h8
-rw-r--r--genome.c4
-rw-r--r--interpolation.c1
-rw-r--r--math.h12
-rw-r--r--parser.c2
-rw-r--r--variations.c40
7 files changed, 71 insertions, 2 deletions
diff --git a/flam3.c b/flam3.c
index e0e014f..9bb8130 100644
--- a/flam3.c
+++ b/flam3.c
@@ -484,6 +484,8 @@ void flam3_copy_params(flam3_xform * restrict dest, flam3_xform * restrict src,
dest->mobius_im_b = src->mobius_im_b;
dest->mobius_im_c = src->mobius_im_c;
dest->mobius_im_d = src->mobius_im_d;
+ } else if (varn==VAR_ASTERIA) {
+ dest->asteria_alpha = src->asteria_alpha;
}
}
@@ -1238,6 +1240,10 @@ static void flam3_print_xform(FILE *f, flam3_xform *x, int final_flag,
fprintf(f, "mobius_im_d=\"%g\" ", x->mobius_im_d);
break;
+ case VAR_ASTERIA:
+ fprintf(f, "asteria_alpha=\"%g\" ", x->asteria_alpha);
+ break;
+
case VAR_SEPARATION:
fprintf(f, "separation_x=\"%g\" ", x->separation_x);
fprintf(f, "separation_y=\"%g\" ", x->separation_y);
diff --git a/flam3.h b/flam3.h
index 9d36ebf..8415974 100644
--- a/flam3.h
+++ b/flam3.h
@@ -30,7 +30,7 @@
extern char *flam3_variation_names[];
-#define flam3_nvariations 99
+#define flam3_nvariations 100
#define flam3_interpolation_linear 0
#define flam3_interpolation_smooth 1
@@ -144,6 +144,7 @@ typedef enum {
#define VAR_AUGER 96
#define VAR_FLUX 97
#define VAR_MOBIUS 98
+#define VAR_ASTERIA 99
#include "vector.h"
#include "random.h"
@@ -366,6 +367,11 @@ typedef struct xform {
double super_shape_pm_4;
double super_shape_pneg1_n1;
+ /* asteria */
+ double asteria_alpha;
+ /* precalc */
+ double asteria_sina, asteria_cosa;
+
int num_active_vars;
double active_var_weights[flam3_nvariations];
int varFunc[flam3_nvariations];
diff --git a/genome.c b/genome.c
index f4ccc8e..1a063af 100644
--- a/genome.c
+++ b/genome.c
@@ -253,6 +253,10 @@ static void random_xform_param (flam3_xform * const xform, const unsigned int i,
xform->mobius_re_d = rand_d11(rc);
xform->mobius_im_d = rand_d11(rc);
break;
+
+ case VAR_ASTERIA:
+ xform->asteria_alpha = rand_d01(rc);
+ break;
}
}
diff --git a/interpolation.c b/interpolation.c
index 5fa1e07..4eae663 100644
--- a/interpolation.c
+++ b/interpolation.c
@@ -472,6 +472,7 @@ void flam3_interpolate_n(flam3_genome *result, int ncp,
INTERP(xform[i].mobius_im_c);
INTERP(xform[i].mobius_re_d);
INTERP(xform[i].mobius_im_d);
+ INTERP(xform[i].asteria_alpha);
for (j = 0; j < flam3_nvariations; j++)
INTERP(xform[i].var[j]);
diff --git a/math.h b/math.h
index 48519b4..c29e427 100644
--- a/math.h
+++ b/math.h
@@ -109,6 +109,18 @@ inline double sum(const double2 in) {
return in[0] + in[1];
}
+inline double square (const double in) {
+ return in * in;
+}
+
+inline double2 square_d2 (const double2 in) {
+ return in * in;
+}
+
+inline double squaresum (const double2 in) {
+ return sum (square_d2 (in));
+}
+
inline void normalize (double * const a, const size_t n) {
double sum = 0.0;
for (unsigned int j = 0; j < n; j++) {
diff --git a/parser.c b/parser.c
index 25e1701..d99dfe8 100644
--- a/parser.c
+++ b/parser.c
@@ -1085,6 +1085,8 @@ static int parse_xform_xml(xmlNode *chld_node,flam3_xform *this_xform, int *num_
this_xform->mobius_im_c = flam3_atof(att_str);
} else if (!xmlStrcmp(cur_att->name, (const xmlChar *)"Im_D") || !xmlStrcmp(cur_att->name, (const xmlChar *)"mobius_im_d")) {
this_xform->mobius_im_d = flam3_atof(att_str);
+ } else if (!xmlStrcmp(cur_att->name, (const xmlChar *)"asteria_alpha")) {
+ this_xform->asteria_alpha = flam3_atof(att_str);
} else {
int v = var2n((char *) cur_att->name);
if (v != flam3_variation_none)
diff --git a/variations.c b/variations.c
index f42c623..caf661b 100644
--- a/variations.c
+++ b/variations.c
@@ -129,6 +129,7 @@ char *flam3_variation_names[1+flam3_nvariations] = {
"auger",
"flux",
"mobius",
+ "asteria",
0
};
@@ -1829,6 +1830,35 @@ static double2 var98_mobius (const double2 in, const flam3_iter_helper * const f
return rad_v * (double2) { (re_u*re_v + im_u*im_v), (im_u*re_v - re_u*im_v) };
}
+static double2 var99_asteria (const double2 in, const flam3_iter_helper * const f, double weight) {
+ /* from jwildfire: asteria by dark-beam,
+ * http://jwildfire.org/forum/viewtopic.php?f=23&t=1464 */
+ const double2 w = weight * in;
+ double r = squaresum (in);
+ double xx = square (fabs(in[0]) - 1.);
+ double yy = square (fabs(in[1]) - 1.);
+ const double r2 = sqrt(yy + xx);
+ bool in1 = r < 1.;
+ const bool out2 = r2 < 1.;
+ if (in1 && out2) {
+ in1 = rand_d01 (f->rc) > 0.35;
+ } else {
+ in1 = !in1;
+ }
+
+ if (in1) {
+ return var0_linear (in, f, weight);
+ } else {
+ const double sina = f->xform->asteria_sina;
+ const double cosa = f->xform->asteria_cosa;
+ xx = w[0] * cosa - w[1] * sina;
+ yy = w[0] * sina + w[1] * cosa;
+ const double nx = xx / sqrt(1. - yy * yy) * (1. - sqrt(1. - square(-fabs(yy) + 1.)));
+ xx = nx * cosa + yy * sina;
+ yy = -nx * sina + yy * cosa;
+ return (double2) { xx, yy };
+ }
+}
/* Precalc functions */
@@ -1892,6 +1922,11 @@ static void supershape_precalc(flam3_xform *xf) {
xf->super_shape_pneg1_n1 = -1.0 / xf->super_shape_n1;
}
+static void asteria_precalc (flam3_xform * const xf) {
+ xf->asteria_sina = sin (M_PI * xf->asteria_alpha);
+ xf->asteria_cosa = cos (M_PI * xf->asteria_alpha);
+}
+
/* Precalculate constants (i.e. not depending on position) for variations
*/
void xform_precalc (flam3_xform * const xform) {
@@ -1903,6 +1938,7 @@ void xform_precalc (flam3_xform * const xform) {
disc2_precalc(xform);
supershape_precalc(xform);
wedgeJulia_precalc(xform);
+ asteria_precalc (xform);
}
static double adjust_percentage(double in) {
@@ -2013,7 +2049,7 @@ int prepare_precalc_flags(flam3_genome *cp) {
xf->precalc_atan_yx_flag=1;
} else if (j==VAR_LOG) {
xf->precalc_atan_yx_flag=1;
- }
+ }
totnum++;
}
@@ -2264,6 +2300,8 @@ int apply_xform(const flam3_xform * const xf, const double4 p, double4 *q_ret,
accum += var97_flux(t, &f, weight); break;
case (VAR_MOBIUS):
accum += var98_mobius(t, &f, weight); break;
+ case VAR_ASTERIA:
+ accum += var99_asteria (t, &f, weight); break;
}
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-25 20:52:06 +0000