From 801b92b6d788d9f693612c0120e96b6b1ceb0e0a Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Sun, 19 Aug 2018 21:16:19 +0200
Subject: Add example programs

---
 bin/chilbert_obj.cpp | 54 ++++++++++++++++++++++++++++++++++++++++++++
 bin/chilbert_svg.cpp | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 117 insertions(+)
 create mode 100644 bin/chilbert_obj.cpp
 create mode 100644 bin/chilbert_svg.cpp

(limited to 'bin')

diff --git a/bin/chilbert_obj.cpp b/bin/chilbert_obj.cpp
new file mode 100644
index 0000000..85fe95a
--- /dev/null
+++ b/bin/chilbert_obj.cpp
@@ -0,0 +1,54 @@
+/*
+  Copyright (C) 2018 David Robillard <d@drobilla.net>
+
+  This program is free software: you can redistribute it and/or modify it under
+  the terms of the GNU General Public License as published by the Free Software
+  Foundation, either version 2 of the License, or (at your option) any later
+  version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+  details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#include "chilbert/chilbert.hpp"
+
+#include <array>
+#include <cstdint>
+#include <cstdio>
+#include <cstdlib>
+
+int
+main(int argc, char** argv)
+{
+	if (argc != 2) {
+		fprintf(stderr, "Usage: %s NUM_POINTS\n", argv[0]);
+		return 1;
+	}
+
+	const unsigned long num_points = std::strtoul(argv[1], nullptr, 10);
+	if (num_points == 0 || num_points == ULONG_MAX) {
+		fprintf(stderr, "Usage: %s NUM_POINTS\n", argv[0]);
+		return 1;
+	}
+
+	// Vertices
+	for (uint64_t i = 0; i < num_points; ++i) {
+		std::array<uint32_t, 3> point;
+		chilbert::index_to_coords(point.data(), 16, 3, i);
+		printf("v %u %u %u\n", point[0], point[1], point[2]);
+	}
+
+	// One polyline through all vertices
+	printf("\nl");
+	for (unsigned i = 0; i < num_points - 1; ++i) {
+		printf(" %u", i + 1);
+	}
+	printf("\n");
+
+	return 0;
+}
diff --git a/bin/chilbert_svg.cpp b/bin/chilbert_svg.cpp
new file mode 100644
index 0000000..7c63042
--- /dev/null
+++ b/bin/chilbert_svg.cpp
@@ -0,0 +1,63 @@
+/*
+  Copyright (C) 2018 David Robillard <d@drobilla.net>
+
+  This program is free software: you can redistribute it and/or modify it under
+  the terms of the GNU General Public License as published by the Free Software
+  Foundation, either version 2 of the License, or (at your option) any later
+  version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+  details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#include "chilbert/chilbert.hpp"
+
+#include <array>
+#include <cmath>
+#include <cstdint>
+#include <cstdio>
+#include <cstdlib>
+
+int
+main(int argc, char** argv)
+{
+	if (argc != 2) {
+		fprintf(stderr, "Usage: %s NUM_POINTS\n", argv[0]);
+		return 1;
+	}
+
+	const unsigned long num_points = std::strtoul(argv[1], nullptr, 10);
+	if (num_points == 0 || num_points == ULONG_MAX) {
+		fprintf(stderr, "Usage: %s NUM_POINTS\n", argv[0]);
+		return 1;
+	}
+
+	const uint32_t w =
+	  uint32_t(sqrt(1 << uint32_t(ceil(log2(num_points))))) - 1;
+
+	// Header
+	printf("<svg xmlns='http://www.w3.org/2000/svg'"
+	       " version='1.2' baseProfile='tiny' viewBox='0 0 %u %u'>\n",
+	       w,
+	       w);
+	printf("<desc>Hilbert Curve</desc>\n");
+	printf("<polyline vector-effect='non-scaling-stroke' fill='none' "
+	       "stroke='black' stroke-width='1' points='");
+
+	// One polyline through all vertices
+	for (uint64_t i = 0; i <= num_points; ++i) {
+		std::array<uint32_t, 2> point;
+		chilbert::index_to_coords(point.data(), 32, 2, i);
+		printf("%u,%u ", point[0], point[1]);
+	}
+
+	// Close off document
+	printf("' />\n</svg>\n");
+
+	return 0;
+}
-- 
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