CGAL 6.1 - 2D Arrangements

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Arrangement_on_surface_2/draw_arr.cpp
#include <CGAL/Exact_predicates_exact_constructions_kernel.h>
#include <CGAL/Arrangement_2.h>
#include <CGAL/Arr_segment_traits_2.h>
#include <CGAL/draw_arrangement_2.h>
using Kernel = CGAL::Exact_predicates_exact_constructions_kernel;
using Traits = CGAL::Arr_segment_traits_2<Kernel>;
using Point = Traits::Point_2;
using Arrangement_2 = CGAL::Arrangement_2<Traits>;
std::tuple<unsigned char, unsigned char, unsigned char>
hsv_to_rgb(float hue, float sat, float value) {
float red, green, blue;
float fc = value * sat; // Chroma
float hue_prime = fmod(hue / 60.0f, 6.f);
float fx = fc * (1.0f - fabs(fmod(hue_prime, 2.f) - 1.f));
float fm = value - fc;
if(0 <= hue_prime && hue_prime < 1) {
red = fc;
green = fx;
blue = 0;
}
else if(1 <= hue_prime && hue_prime < 2) {
red = fx;
green = fc;
blue = 0;
}
else if(2 <= hue_prime && hue_prime < 3) {
red = 0;
green = fc;
blue = fx;
}
else if(3 <= hue_prime && hue_prime < 4) {
red = 0;
green = fx;
blue = fc;
}
else if(4 <= hue_prime && hue_prime < 5) {
red = fx;
green = 0;
blue = fc;
}
else if(5 <= hue_prime && hue_prime < 6) {
red = fc;
green = 0;
blue = fx;
}
else {
red = 0;
green = 0;
blue = 0;
}
red += fm;
green += fm;
blue += fm;
red *= 255;
green *= 255;
blue *= 255;
unsigned char redc = (unsigned char)red;
unsigned char greenc = (unsigned char)green;
unsigned char bluec = (unsigned char)blue;
return std::make_tuple(redc, greenc, bluec);
}
int main() {
Traits traits;
Arrangement_2 arr(&traits);
auto ctr_xcv = traits.construct_x_monotone_curve_2_object();
CGAL::insert(arr, ctr_xcv(Point(-2,-2), Point(2,-2)));
CGAL::insert(arr, ctr_xcv(Point(2,-2), Point(2,2)));
CGAL::insert(arr, ctr_xcv(Point(2,2), Point(-2,2)));
CGAL::insert(arr, ctr_xcv(Point(-2,2), Point(-2,-2)));
CGAL::insert(arr, ctr_xcv(Point(-1,-1), Point(1,-1)));
CGAL::insert(arr, ctr_xcv(Point(1,-1), Point(1,1)));
CGAL::insert(arr, ctr_xcv(Point(1,1), Point(-1,1)));
CGAL::insert(arr, ctr_xcv(Point(-1,1), Point(-1,-1)));
CGAL::insert(arr, ctr_xcv(Point(-2,-2), Point(-2,-4)));
CGAL::insert(arr, ctr_xcv(Point(2,-2), Point(4,-2)));
CGAL::insert(arr, ctr_xcv(Point(0,0), Point(0,-3)));
std::cout << arr.number_of_vertices() << ", "
<< arr.number_of_edges() << ", "
<< arr.number_of_faces() << std::endl;
std::size_t id(0);
CGAL::Graphics_scene_options<Arrangement_2,
typename Arrangement_2::Vertex_const_handle,
typename Arrangement_2::Halfedge_const_handle,
typename Arrangement_2::Face_const_handle> gso;
gso.colored_face=[](const Arrangement_2&, Arrangement_2::Face_const_handle) -> bool
{ return true; };
gso.face_color=[&id](const Arrangement_2& arr, Arrangement_2::Face_const_handle) -> CGAL::IO::Color
{
float h = 360.0f * id++ / arr.number_of_faces();
float s = 0.5;
float v = 0.5;
auto [r, g, b] = hsv_to_rgb(h, s, v);
return CGAL::IO::Color(r,g,b);
};
CGAL::draw(arr, gso, "hsv colors");
return EXIT_SUCCESS;
}
CGAL::Arr_segment_traits_2
The traits class Arr_segment_traits_2 is a model of the AosTraits_2 concept, which allows the constru...
Definition: Arr_segment_traits_2.h:58
CGAL::Arrangement_2
Definition: Arrangement_2.h:57
CGAL::Exact_predicates_exact_constructions_kernel
CGAL::IO::Color
CGAL::insert
void insert(Arrangement_2< Traits, Dcel > &arr, const Curve &c, const PointLocation &pl=walk_pl)
The function insert inserts one or more curves or -monotone curves into a given arrangement,...
CGAL::draw
void draw(const PS2 &ps2, const GSOptions &gso)
Kernel