AnimTrail.h

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#pragma once
 
#include <string>
#include <vector>
 
namespace eve::graphics {
class Graphics;
}
 
namespace eve::animation {
 
class AnimPose;
 
class AnimTrail {
public:
    explicit AnimTrail(int capacity = 64);
    ~AnimTrail() = default;
 
    AnimTrail(const AnimTrail &)            = delete;
    AnimTrail &operator=(const AnimTrail &) = delete;
 
    void setCapacity(int capacity);
    int  getCapacity() const { return capacity_; }
 
    void  setDuration(float seconds);
    float getDuration() const { return duration_; }
 
    void  setMinDistance(float distance);
    float getMinDistance() const { return minDistance_; }
 
    void  setWidth(float pixels);
    float getWidth() const { return width_; }
 
    void  setColor(float r, float g, float b, float a = 1.f);
    float getColorR() const { return colorR_; }
    float getColorG() const { return colorG_; }
    float getColorB() const { return colorB_; }
    float getColorA() const { return colorA_; }
 
    void setFade(bool enable);
    bool getFade() const { return fade_; }
 
    void        setStyle(const std::string &style);
    std::string getStyle() const;
 
    void  setDrawScale(float sx, float sy);
    float getDrawScaleX() const { return drawScaleX_; }
    float getDrawScaleY() const { return drawScaleY_; }
    void  setDrawOffset(float ox, float oy);
    float getDrawOffsetX() const { return drawOffsetX_; }
    float getDrawOffsetY() const { return drawOffsetY_; }
 
    void addPoint(float x, float y);
    void addPoint3(float x, float y, float z);
 
    void sampleBone(const AnimPose *pose, int boneIndex, const std::string &plane = "xy");
    void sampleBoneOffset(const AnimPose *pose, int boneIndex, float ox, float oy, float oz,
                          const std::string &plane = "xy");
 
    void clear();
 
    void update(float dt);
 
    int   getPointCount() const { return static_cast<int>(points_.size()); }
    float getPointX(int index) const;
    float getPointY(int index) const;
    float getPointZ(int index) const;
    float getPointAge(int index) const;
    float getPointAlpha(int index) const;
 
    void draw(graphics::Graphics *gfx);
 
private:
    enum class Style { Line, Points };
 
    struct Point {
        float x = 0.f, y = 0.f, z = 0.f;
        float age = 0.f;
    };
 
    void      pushPoint(float x, float y, float z);
    void      requireIndex(int index) const;
    void      projectPlane(float x, float y, float z, const std::string &plane, float *outX,
                         float *outY) const;
    float     alphaFor(const Point &p) const;
    void      toScreen(float x, float y, float *sx, float *sy) const;
    void      drawSegment(graphics::Graphics *gfx, float x0, float y0, float x1, float y1, float a0,
                        float a1) const;
    void      drawDot(graphics::Graphics *gfx, float x, float y, float alpha) const;
 
    int   capacity_    = 64;
    float duration_    = 0.5f;
    float minDistance_ = 0.f;
    float width_       = 3.f;
    float colorR_ = 1.f, colorG_ = 0.85f, colorB_ = 0.35f, colorA_ = 1.f;
    bool  fade_  = true;
    Style style_ = Style::Line;
 
    float drawScaleX_  = 1.f;
    float drawScaleY_  = 1.f;
    float drawOffsetX_ = 0.f;
    float drawOffsetY_ = 0.f;
 
    std::vector<Point> points_;
};
 
}  // namespace eve::animation