outline_2d.h

// Copyright 2019 The Darwin Neuroevolution Framework Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#pragma once

#include <core/math_2d.h>

#include <vector>
using namespace std;

namespace math {

using Polygon = vector<Vector2d>;

class Outline {
 public:
  struct Node {
    Vector2d p;  
    Vector2d n;  

    Vector2d offset(double offset) const { return p + n * offset; }
  };

 public:
  Outline() = default;

  explicit Outline(const Polygon& control_points, int resolution);

  const vector<Node>& nodes() const { return nodes_; }

  Outline offset(double offset) const;

  Outline makeEquidistant() const;

  Polygon toPolygon() const;

  const Node& findClosestNode(const Vector2d& pos) const;

  void clear() { nodes_.clear(); }

  bool empty() const { return nodes_.empty(); }

 private:
  void createNodes(const Polygon& polygon);

 private:
  vector<Node> nodes_;
};

}  // namespace math