From 9c6505dace488032dc4f5e3bbb8c5a4cb154b429 Mon Sep 17 00:00:00 2001
From: pants <jaron@kent-dobias.com>
Date: Thu, 8 Sep 2016 12:46:49 -0400
Subject: more refactoring

---
 src/graph_genfunc.c | 78 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 src/graph_genfunc.c

(limited to 'src/graph_genfunc.c')

diff --git a/src/graph_genfunc.c b/src/graph_genfunc.c
new file mode 100644
index 0000000..991e127
--- /dev/null
+++ b/src/graph_genfunc.c
@@ -0,0 +1,78 @@
+
+#include "fracture.h"
+
+double *genfunc_uniform(unsigned int L, bound_t boundary, gsl_rng *r, unsigned int *num) {
+	*num = pow(L / 2 + 1, 2) + pow((L + 1) / 2, 2);
+
+	double *lattice = (double *)malloc(2 * (*num) * sizeof(double));
+	for (unsigned int i = 0; i < (*num); i++) {
+		lattice[2*i] = gsl_ran_flat(r, 0, 1);
+		lattice[2*i+1] = gsl_ran_flat(r, 0, 1);
+	}
+
+	return lattice;
+}
+
+double *genfunc_hyperuniform(unsigned int L, bound_t boundary, gsl_rng *r, unsigned int *num) {
+	*num = pow(L / 2 + 1, 2) + pow((L + 1) / 2, 2);
+
+	// necessary to prevent crashing when underflow occurs
+	gsl_set_error_handler_off();
+
+	double *lattice = (double *)malloc(2 * (*num) * sizeof(double));
+	double rho = *num;
+	unsigned int to_gen = *num;
+	unsigned int start = 0;
+
+	if (boundary == EMBEDDED_BOUND) {
+		for (unsigned int i = 0; i < L / 2; i++) {
+			lattice[2 * i + 1] = 0;
+			lattice[2 * i] = (2. * i + 1.) / L;
+
+			lattice[L + 2 * i + 1] = 1;
+			lattice[L + 2 * i] = (2. * i + 1.) / L;
+
+			lattice[2 * L + 2 * i + 1] = (2. * i + 1.) / L;
+			lattice[2 * L + 2 * i] = 0;
+
+			lattice[3 * L + 2 * i + 1] = (2. * i + 1.) / L;
+			lattice[3 * L + 2 * i] = 1;
+		}
+
+		to_gen -= 2 * L;
+		start = 2 * L;
+	}
+
+	for (unsigned int i = 0; i < to_gen; i++) {
+		bool reject = true;
+		double x, y;
+		while(reject) {
+			x = gsl_ran_flat(r, 0, 1);
+			y = gsl_ran_flat(r, 0, 1);
+			reject = false;
+			for (unsigned int j = 0; j < i; j++) {
+				double *ds = (double *)malloc(5 * sizeof(double));
+				ds[0] = pow(x-lattice[2*j],2)+pow(y-lattice[2*j+1],2);
+				ds[1] = pow(x-lattice[2*j] + 1,2)+pow(y-lattice[2*j+1],2);
+				ds[2] = pow(x-lattice[2*j] - 1,2)+pow(y-lattice[2*j+1],2);
+				ds[3] = pow(x-lattice[2*j],2)+pow(y-lattice[2*j+1] + 1,2);
+				ds[4] = pow(x-lattice[2*j],2)+pow(y-lattice[2*j+1] - 1,2);
+				double min_val = 100;
+				for (unsigned int k = 0; k < 5; k++) {
+					if (min_val > ds[k]) {
+						min_val = ds[k];
+					}
+				}
+				if (1-gsl_sf_exp(-M_PI * rho * min_val) < gsl_ran_flat(r, 0, 1)) {
+					reject = true;
+					break;
+				}
+			}
+		}
+		lattice[2*start + 2 * i] = x;
+		lattice[2*start + 2 * i + 1] = y;
+	}
+
+	return lattice;
+}
+
-- 
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