build: add poisson sample demo

CMakeLists.txt

@@ -451,7 +451,7 @@ target_link_libraries(cruft-util dl)
 
 
 ###############################################################################
-foreach (tool cpuid json-clean json-schema json-validate macro scratch)
+foreach (tool cpuid json-clean json-schema json-validate poisson macro scratch)
     add_executable (util_${tool} tools/${tool}.cpp)
     set_target_properties (util_${tool} PROPERTIES OUTPUT_NAME ${tool})
     target_link_libraries (util_${tool} cruft-util)

tools/poisson.cpp

@@ -0,0 +1,30 @@
+#include "cmdopt.hpp"
+#include "geom/sample.hpp"
+
+#include <cstdlib>
+#include <iostream>
+
+///////////////////////////////////////////////////////////////////////////////
+int
+main (int argc, char **argv)
+{
+    util::extent2i area {256, 256};
+    float distance = 5.f;
+    int samples = 15;
+
+    util::cmdopt::parser opts;
+    opts.add<util::cmdopt::option::value<int>>   ('w', "width",   "width of the space to fill", area.w);
+    opts.add<util::cmdopt::option::value<int>>   ('h', "height",  "height of the space to fill", area.h);
+    opts.add<util::cmdopt::option::value<float>> ('d', "distance", "minimum distance between samples", distance);
+    opts.add<util::cmdopt::option::value<int>>   ('s', "samples", "number of samples per iteration", samples);
+
+    opts.scan (argc, argv);
+
+
+    std::cout << "<svg height='" << area.h << "' width='" << area.h << "'>";
+    for (auto p: util::geom::poisson_sample (area, distance, samples))
+        std::cout << "<circle cx='" << p.x << "' cy='" << p.y << "' r='1' />";
+    std::cout << "</svg>";
+
+    return EXIT_SUCCESS;
+}