effects.hpp

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// Copyright 2020-2024 Jan Niklas Hasse <jhasse@bixense.com>
// For conditions of distribution and use, see copyright notice in LICENSE.txt
#pragma once
 
#include "Vec2.hpp"
#include <cstdint>
#include <functional>
 
namespace jngl {
 
class Mat3;
 
class Effect {
public:
    enum class Action : uint8_t {
        NONE,
        REMOVE_EFFECT,
        REMOVE_WIDGET,
    };
 
    virtual ~Effect();
    [[nodiscard]] virtual Action step() = 0;
    virtual void beginDraw() const = 0;
    virtual void endDraw() const = 0;
 
    virtual void updateModelview(Mat3& modelview) const;
};
 
class UpdateModelview : public Effect {
public:
    explicit UpdateModelview(std::function<void(float t, Mat3&)>);
    Action step() override;
    void beginDraw() const override;
    void endDraw() const override;
    void updateModelview(Mat3& modelview) const override;
 
private:
    std::function<void(float t, Mat3&)> function;
    float time = 0;
};
 
class Zoom : public Effect {
public:
    explicit Zoom(std::function<float(float)>);
    Action step() override;
    void beginDraw() const override;
    void endDraw() const override;
 
private:
    std::function<float(float)> function;
    float time = 0;
};
 
class Executor : public Effect {
public:
    explicit Executor(std::function<Action(float)>);
    Action step() override;
 
    void beginDraw() const override;
    void endDraw() const override;
 
private:
    std::function<Action(float)> function;
    float time = 0;
};
 
class Move : public Effect {
public:
    explicit Move(Vec2 offset, std::function<float(float)>);
    Action step() override;
    void beginDraw() const override;
    void endDraw() const override;
 
private:
    Vec2 offset;
    float progress;
    std::function<float(float)> function;
    float time = 0;
};
 
namespace easing {
 
float linear(float);
float elastic(float);
float cubic(float);
float expo(float);
 
} // namespace easing
 
} // namespace jngl