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Diffstat (limited to 'scene/resources/2d/convex_polygon_shape_2d.cpp')
| -rw-r--r-- | scene/resources/2d/convex_polygon_shape_2d.cpp | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/scene/resources/2d/convex_polygon_shape_2d.cpp b/scene/resources/2d/convex_polygon_shape_2d.cpp new file mode 100644 index 0000000000..0d9e570149 --- /dev/null +++ b/scene/resources/2d/convex_polygon_shape_2d.cpp @@ -0,0 +1,143 @@ +/**************************************************************************/ +/* convex_polygon_shape_2d.cpp */ +/**************************************************************************/ +/* This file is part of: */ +/* GODOT ENGINE */ +/* https://godotengine.org */ +/**************************************************************************/ +/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */ +/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */ +/* */ +/* Permission is hereby granted, free of charge, to any person obtaining */ +/* a copy of this software and associated documentation files (the */ +/* "Software"), to deal in the Software without restriction, including */ +/* without limitation the rights to use, copy, modify, merge, publish, */ +/* distribute, sublicense, and/or sell copies of the Software, and to */ +/* permit persons to whom the Software is furnished to do so, subject to */ +/* the following conditions: */ +/* */ +/* The above copyright notice and this permission notice shall be */ +/* included in all copies or substantial portions of the Software. */ +/* */ +/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */ +/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */ +/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */ +/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */ +/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */ +/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */ +/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ +/**************************************************************************/ + +#include "convex_polygon_shape_2d.h" + +#include "core/math/geometry_2d.h" +#include "servers/physics_server_2d.h" +#include "servers/rendering_server.h" + +bool ConvexPolygonShape2D::_edit_is_selected_on_click(const Point2 &p_point, double p_tolerance) const { + return Geometry2D::is_point_in_polygon(p_point, points); +} + +#ifdef DEBUG_ENABLED +// Check if point p3 is to the left of [p1, p2] segment or on it. +bool left_test(const Vector2 &p1, const Vector2 &p2, const Vector2 &p3) { + Vector2 p12 = p2 - p1; + Vector2 p13 = p3 - p1; + // If the value of the cross product is positive or zero; p3 is to the left or on the segment, respectively. + return p12.cross(p13) >= 0; +} + +bool is_convex(const Vector<Vector2> &p_points) { + // Pre-condition: Polygon is in counter-clockwise order. + int polygon_size = p_points.size(); + for (int i = 0; i < polygon_size && polygon_size > 3; i++) { + int j = (i + 1) % polygon_size; + int k = (j + 1) % polygon_size; + // If any consecutive three points fail left-test, then there is a concavity. + if (!left_test(p_points[i], p_points[j], p_points[k])) { + return false; + } + } + + return true; +} +#endif + +void ConvexPolygonShape2D::_update_shape() { + Vector<Vector2> final_points = points; + if (Geometry2D::is_polygon_clockwise(final_points)) { //needs to be counter clockwise + final_points.reverse(); + } +#ifdef DEBUG_ENABLED + if (!is_convex(final_points)) { + WARN_PRINT("Concave polygon is assigned to ConvexPolygonShape2D."); + } +#endif + PhysicsServer2D::get_singleton()->shape_set_data(get_rid(), final_points); + emit_changed(); +} + +void ConvexPolygonShape2D::set_point_cloud(const Vector<Vector2> &p_points) { + Vector<Point2> hull = Geometry2D::convex_hull(p_points); + ERR_FAIL_COND(hull.size() < 3); + set_points(hull); +} + +void ConvexPolygonShape2D::set_points(const Vector<Vector2> &p_points) { + points = p_points; + + _update_shape(); +} + +Vector<Vector2> ConvexPolygonShape2D::get_points() const { + return points; +} + +void ConvexPolygonShape2D::_bind_methods() { + ClassDB::bind_method(D_METHOD("set_point_cloud", "point_cloud"), &ConvexPolygonShape2D::set_point_cloud); + ClassDB::bind_method(D_METHOD("set_points", "points"), &ConvexPolygonShape2D::set_points); + ClassDB::bind_method(D_METHOD("get_points"), &ConvexPolygonShape2D::get_points); + + ADD_PROPERTY(PropertyInfo(Variant::PACKED_VECTOR2_ARRAY, "points"), "set_points", "get_points"); +} + +void ConvexPolygonShape2D::draw(const RID &p_to_rid, const Color &p_color) { + if (points.size() < 3) { + return; + } + + Vector<Color> col = { p_color }; + RenderingServer::get_singleton()->canvas_item_add_polygon(p_to_rid, points, col); + + if (is_collision_outline_enabled()) { + col = { Color(p_color, 1.0) }; + RenderingServer::get_singleton()->canvas_item_add_polyline(p_to_rid, points, col); + // Draw the last segment. + RenderingServer::get_singleton()->canvas_item_add_line(p_to_rid, points[points.size() - 1], points[0], Color(p_color, 1.0)); + } +} + +Rect2 ConvexPolygonShape2D::get_rect() const { + Rect2 rect; + for (int i = 0; i < points.size(); i++) { + if (i == 0) { + rect.position = points[i]; + } else { + rect.expand_to(points[i]); + } + } + + return rect; +} + +real_t ConvexPolygonShape2D::get_enclosing_radius() const { + real_t r = 0.0; + for (int i(0); i < get_points().size(); i++) { + r = MAX(get_points()[i].length_squared(), r); + } + return Math::sqrt(r); +} + +ConvexPolygonShape2D::ConvexPolygonShape2D() : + Shape2D(PhysicsServer2D::get_singleton()->convex_polygon_shape_create()) { +} |