math_angles.h

#ifndef GFX_ANGLES_H
#define GFX_ANGLES_H

#ifdef FAKE_ARDUINO
#include "FakeArduino.h"
#else
#include <Arduino.h>
#endif

/**
 * @brief Find the x-axis point which is at a distance r and an angle d of a point C(cx,cy).
 * 
 * 0 degrees ist 12 o'clock
 * 
 * This function can be used to find coordonnates of the extremity of the clock hand from the center
 * 
 * @param cx x value of the initial point
 * @param r radius
 * @param d angle in degrees (0° is 12 o'clock)
 * @return float 
 */
float rpx(float cx, float x, float r);


/**
 * Find the y-axis of a point which is at a distance r and an angle d of a point C(cx,cy).
 * 
 *      0 degrees ist 12 o'clock
 *      This function can be used to find coordonnates of the extremity of the clock hand from the center
 * 
 * @param cy y value of the initial point
 * @param r radius
 * @param d angle in degrees (0° is 12 o'clock)
 * @return float 
 */
float rpy(float cy, float y, float r);

int32_t rotateX(int32_t x, int32_t y, int32_t rx, int32_t ry, float cosA, float sinA);
int32_t rotateY(int32_t x, int32_t y, int32_t rx, int32_t ry, float cosA, float sinA);
int32_t rotateX(int32_t x, int32_t y, int32_t rx, int32_t ry, float a);
int32_t rotateY(int32_t x, int32_t y, int32_t rx, int32_t ry, float a);

/**
 * Convert seconds in degrees.
 * 
 * 0 seconds = 0° / 15 seconds = 90° ...
 * 
 * @param seconds seconds to convert
 * @return float angle in degrees
 */
float s2d(long seconds);

// minutes to degrees (0-360)
float m2d(long seconds);

// hours to degrees (0-360)
float h2d(long seconds);

bool pointInsideTriangle(float px, float py, float x1, float y1, float x2, float y2, float x3, float y3);
#endif