#ifndef GEOM_H
#define GEOM_H

#include <raylib.h>
#include <stdbool.h>
#include <stdlib.h>

// The maximum number of Tris in a Plate.
#define NTRI 4

// A two dimensional vector.
typedef struct {
    int x;
    int y;
} Vec2;

typedef struct {
    int x, y;
} Pt;

typedef struct {
    Pt* a;
    Pt* b;
} Edge;

typedef struct {
    Pt a;
    Pt b;
    Pt c;
} Tri;

extern Tri* alltris[512];
extern size_t allsize;

Tri* tri_init(Pt a, Pt b, Pt c);
void tri_destroy(Tri* tri);

// Check if a point is within the triangle. Uses barycentric coordinate system.
bool tri_within(Pt pt, Tri* tri);

// Get the center point of a Tri.
Pt tri_center(Tri* tri);

// Compare two points.
int pt_cmp(const void* a, const void* b);

// Get the convex hull around the area. Given the points in the area and their
// number.
Pt* cvx_hull(Pt* area, size_t n, size_t* out_n);

typedef struct {
    Color col;
    size_t ntris;
    Tri* tris;
} Plate;

#endif