LinearCurve.h

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// Jolt Physics Library (https://github.com/jrouwe/JoltPhysics)
// SPDX-FileCopyrightText: 2021 Jorrit Rouwe
// SPDX-License-Identifier: MIT
 
#pragma once
 
#include <Jolt/ObjectStream/SerializableObject.h>
#include <Jolt/Core/QuickSort.h>
 
JPH_NAMESPACE_BEGIN
 
class StreamOut;
class StreamIn;
 
// A set of points (x, y) that form a linear curve
class JPH_EXPORT LinearCurve
{
    JPH_DECLARE_SERIALIZABLE_NON_VIRTUAL(JPH_EXPORT, LinearCurve)
 
public:
    class Point
    {
        JPH_DECLARE_SERIALIZABLE_NON_VIRTUAL(JPH_EXPORT, Point)
 
    public:
        float           mX = 0.0f;
        float           mY = 0.0f;
    };

    void                Clear()                                         { mPoints.clear(); }

    void                Reserve(uint inNumPoints)                       { mPoints.reserve(inNumPoints); }

    void                AddPoint(float inX, float inY)                  { mPoints.push_back({ inX, inY }); }

    void                Sort()                                          { QuickSort(mPoints.begin(), mPoints.end(), [](const Point &inLHS, const Point &inRHS) { return inLHS.mX < inRHS.mX; }); }

    float               GetMinX() const                                 { return mPoints.empty()? 0.0f : mPoints.front().mX; }

    float               GetMaxX() const                                 { return mPoints.empty()? 0.0f : mPoints.back().mX; }

    float               GetValue(float inX) const;

    void                SaveBinaryState(StreamOut &inStream) const;

    void                RestoreBinaryState(StreamIn &inStream);

    using Points = Array<Point>;
    Points              mPoints;
};
 
JPH_NAMESPACE_END