Smiley.h

#ifndef SMILEY_H
#define SMILEY_H

#include <Arduino.h>
#include <Arduino_GFX_Library.h>

class Smiley {
public:
    // Constructor with width, height, and smile curvature sequence
    // curvature: 0 = straight, -100 = max sorrow, 100 = max smile
    Smiley(int width, int height, const int8_t* curvatureSequence, int sequenceLength);
    ~Smiley();

    // Initialize - must be called before draw/update
    // Pass the GFX object and center position (centerX, centerY)
    // fgColor and bgColor are RGB565 format
    // Returns false if memory allocation fails
    bool begin(Arduino_GFX* gfx, int centerX, int centerY, uint16_t fgColor = 0xFFFF, uint16_t bgColor = 0x0000);

    // Draw current frame to display
    void draw();

    // Advance to next frame and draw
    void update();

    // Set current frame index
    void setFrame(int frameIndex);

    // Set curvature directly (-100 to 100) and draw
    void setCurvature(int curvature);

    // Get dimensions
    int getWidth() const { return _width; }
    int getHeight() const { return _height; }
    int getFrameCount() const { return _sequenceLength; }
    int getCurrentFrame() const { return _currentFrame; }

    // Get/set position
    int getX() const { return _x; }
    int getY() const { return _y; }
    void setPosition(int x, int y) { _x = x; _y = y; }

    // Buffer size in pixels
    int getPixelCount() const { return _width * _height; }

private:
    int _width;
    int _height;
    const int8_t* _curvatureSequence;
    int _sequenceLength;
    int _currentFrame;

    int _x;  // Draw position X
    int _y;  // Draw position Y
    int _innerRadius;  // Inner radius of circle for scaling features

    uint16_t _fgColor;
    uint16_t _bgColor;

    Arduino_GFX* _gfx;

    uint16_t* _baseBuffer;   // Contains eyes (static)
    uint16_t* _frameBuffer;  // Contains full frame (eyes + current smile)

    // Render frame buffer with given curvature
    void renderFrame(int curvature);

    // Helper to set a pixel in the RGB565 buffer
    void setPixel(uint16_t* buffer, int x, int y, bool foreground);

    // Clear a rectangular region to background
    void clearRect(uint16_t* buffer, int x, int y, int w, int h);

    // Draw filled ellipse
    void drawFilledEllipse(uint16_t* buffer, int cx, int cy, int rx, int ry);

    // Draw the smile/frown arc based on curvature (-100 to 100)
    void drawSmile(uint16_t* buffer, int curvature);

    // Draw thick arc (smile with thickness)
    void drawThickArc(uint16_t* buffer, int cx, int cy, int rx, int ry,
                      int thickness, int curvature, bool isSmile);

    // Get smile region bounds
    void getSmileRegion(int& x, int& y, int& w, int& h);

    // Draw circle outline with thickness
    void drawCircle(uint16_t* buffer, int cx, int cy, int radius, int thickness);
};

#endif