Path.hpp

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/*
   Copyright 2022 Rishi Challa
 
   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 <Kale/Math/Vector/Vector.hpp>
#include <Kale/Math/Rect/Rect.hpp>
#include <Kale/Math/Transform/Transform.hpp>
 
#include <vector>
#include <ostream>
#include <utility>
 
#include <nlohmann/json.hpp>
 
namespace Kale {
 
    using JSON = nlohmann::json;
 
    struct CubicBezier {
        Vector2f start, controlPoint1, controlPoint2, end;
    };
 
    class Path {
    private:
 
        void roundCorners(const std::vector<std::pair<Vector2f, float>>& lines);
 
    public:
 
        std::vector<CubicBezier> beziers;
 
        Path();
 
        Path(size_t n);
 
        Path(const std::vector<CubicBezier>& beziers);
        
        Path(const std::vector<Vector2f>& lines, float cornerRadius);
        
        Path(const std::vector<std::pair<Vector2f, float>>& lines);
 
        Rect getBoundingBox() const;
 
        void operator+=(const Path& other);
 
        Path operator*(float value) const;
 
        void moveTo(Vector2f pos);
 
        void lineTo(Vector2f pos);
 
        void bezierTo(Vector2f controlPoint1, Vector2f controlPoint2, Vector2f end);
 
        void arcTo(Vector2f end, Vector2f center, bool clockwise);
 
        void closePath();
 
    };
 
    std::ostream& operator<<(std::ostream& os, const CubicBezier& bezier);
 
    std::ostream& operator<<(std::ostream& os, const Path& path);
 
    inline void from_json(const JSON& j, CubicBezier& p) {
        p.start = j["P0"].get<Vector2f>();
        p.controlPoint1 = j["P1"].get<Vector2f>();
        p.controlPoint2 = j["P2"].get<Vector2f>();
        p.end = j["P3"].get<Vector2f>();
    }
 
    inline void to_json(JSON& j, const CubicBezier& p) {
        j = {{"P0", p.start}, {"P1", p.controlPoint1}, {"P2", p.controlPoint2}, {"P3", p.end}};
    }
 
    inline void from_json(const JSON& j, Path& p) {
        p.beziers = j.get<std::vector<CubicBezier>>();
    }
 
    inline void to_json(JSON& j, const Path& p) {
        j = JSON(p.beziers);
    }
 
}