curveEvaluator.h

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// SPDX-License-Identifier: Apache-2.0
// Copyright 2025-2026 Arnis Lektauers
#pragma once
 
#include <limits>
#include <vector>
 
namespace visutwin::canvas
{
    class Curve;
 
    class CurveEvaluator
    {
    public:
        explicit CurveEvaluator(Curve* curve, float time = 0.0f);
 
        float evaluate(float time, bool forceReset = false);
 
    private:
        void reset(float time);
        void calcTangents(const std::vector<std::pair<float, float>>& keys, size_t index);
 
        static float evaluateHermite(float p0, float p1, float m0, float m1, float t);
 
        Curve* _curve = nullptr;
 
        float _left = -std::numeric_limits<float>::infinity();
        float _right = std::numeric_limits<float>::infinity();
 
        float _recip = 0.0f;
        float _p0 = 0.0f;
        float _p1 = 0.0f;
        float _m0 = 0.0f;
        float _m1 = 0.0f;
    };
}