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Expose 2D Delaunay triangulation in Geometry singleton 

Can be used via scripting as `Geometry.triangulate_delaunay_2d(points)`

The interface is the same as in `Triangulate` library, returning indices
into triangulated points.
This commit is contained in:
Andrii Doroshenko (Xrayez) 2019-05-23 16:53:53 +03:00
parent 1deb41226d
commit 24e9a881c0
4 changed files with 30 additions and 0 deletions
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6
core/bind/core_bind.cpp
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@ -1501,6 +1501,11 @@ Vector<int> _Geometry::triangulate_polygon(const Vector<Vector2> &p_polygon) {
return Geometry::triangulate_polygon(p_polygon);
}
Vector<int> _Geometry::triangulate_delaunay_2d(const Vector<Vector2> &p_points) {
return Geometry::triangulate_delaunay_2d(p_points);
}
Vector<Point2> _Geometry::convex_hull_2d(const Vector<Point2> &p_points) {
return Geometry::convex_hull_2d(p_points);
@ -1674,6 +1679,7 @@ void _Geometry::_bind_methods() {
ClassDB::bind_method(D_METHOD("is_polygon_clockwise", "polygon"), &_Geometry::is_polygon_clockwise);
ClassDB::bind_method(D_METHOD("triangulate_polygon", "polygon"), &_Geometry::triangulate_polygon);
ClassDB::bind_method(D_METHOD("triangulate_delaunay_2d", "points"), &_Geometry::triangulate_delaunay_2d);
ClassDB::bind_method(D_METHOD("convex_hull_2d", "points"), &_Geometry::convex_hull_2d);
ClassDB::bind_method(D_METHOD("clip_polygon", "points", "plane"), &_Geometry::clip_polygon);

1
core/bind/core_bind.h
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@ -404,6 +404,7 @@ public:
bool is_polygon_clockwise(const Vector<Vector2> &p_polygon);
Vector<int> triangulate_polygon(const Vector<Vector2> &p_polygon);
Vector<int> triangulate_delaunay_2d(const Vector<Vector2> &p_points);
Vector<Point2> convex_hull_2d(const Vector<Point2> &p_points);
Vector<Vector3> clip_polygon(const Vector<Vector3> &p_points, const Plane &p_plane);

14
core/math/geometry.h
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@ -31,6 +31,7 @@
#ifndef GEOMETRY_H
#define GEOMETRY_H
#include "core/math/delaunay.h"
#include "core/math/face3.h"
#include "core/math/rect2.h"
#include "core/math/triangulate.h"
@ -857,6 +858,19 @@ public:
return points;
}
static Vector<int> triangulate_delaunay_2d(const Vector<Vector2> &p_points) {
Vector<Delaunay2D::Triangle> tr = Delaunay2D::triangulate(p_points);
Vector<int> triangles;
for (int i = 0; i < tr.size(); i++) {
triangles.push_back(tr[i].points[0]);
triangles.push_back(tr[i].points[1]);
triangles.push_back(tr[i].points[2]);
}
return triangles;
}
static Vector<int> triangulate_polygon(const Vector<Vector2> &p_polygon) {
Vector<int> triangles;

9
doc/classes/Geometry.xml
View File

@ -428,6 +428,15 @@
Can be useful in conjuction with performing polygon boolean operations in CSG manner, see [method merge_polygons_2d], [method clip_polygons_2d], [method intersect_polygons_2d], [method exclude_polygons_2d].
</description>
</method>
<method name="triangulate_delaunay_2d">
<return type="PoolIntArray">
</return>
<argument index="0" name="points" type="PoolVector2Array">
</argument>
<description>
Triangulates the area specified by discrete set of [code]points[/code] such that no point is inside the circumcircle of any resulting triangle. Returns a [PoolIntArray] where each triangle consists of three consecutive point indices into [code]points[/code] (i.e. the returned array will have [code]n * 3[/code] elements, with [code]n[/code] being the number of found triangles). If the triangulation did not succeed, an empty [PoolIntArray] is returned.
</description>
</method>
<method name="triangulate_polygon">
<return type="PoolIntArray">
</return>