gamestate.h

//exposes the parts of the model needed elsewhere. Such as the fire function called by the controller.

#include <math.h>

#define PI 3.14159265358979323846

typedef struct particle{
    float x;
		float y;
    float vx;
		float vy;
		float heading;
    float dur;
		int size;
		int draw;
    struct particle *next;
} node_t;



static float thrustMax = 2;
static float thrustInc = 0.2;
static float friction = 0.99;
const float Dt = 0.025;

void physics(void);

void initGamestate(void);
void updateShipBorder(void);
void updateShipLocation(void);
void testGameBorders(void);
void incHeading(void);
void decHeading(void);
void rotateShip(void);
void addThrust(void);
void applyFriction(void);

float calcMissileVx(void);
float calcMissileVy(void);

float calcAstRandX(void);
float calcAstRandY(void);
float calcAstRandVx(float heading);
float calcAstRandVy(float heading);
float calcAstRandHeading(void);
int calcAstRandSize(void);
void checkMissileAsteroidCollision(struct particle *ast, struct particle *mis);

float toRads(float heading);

//getters
float getHeading(void);
float getHeadingRads(void);
float getShipX(void);
float getShipY(void);

float getShipX1(void);
float getShipY1(void);
float getShipX2(void);
float getShipY2(void);
float getShipX3(void);
float getShipY3(void);

float getShipVy(void);
float getShipVx(void);

struct particle* getMissileList(void);
struct particle* getAsteroidList(void);

int getCollisionCounter(void);

//particle system functions - missiles
void newMissile(void);
void initMissile(struct particle *m);
void updateMissiles(struct particle *l);

//particle system functions - asteroids
void updateAsteroids(struct particle *l);
void initAsteroid(struct particle *a);
void newAsteroid(void);
void initAsteroidProperties(struct particle *a);

//node functions - missiles
void initialise_heapM(void);
node_t *allocnodeM(void);
void freenodeM(node_t *n);

//node functions - asteroids 
void initialise_heapA(void);
node_t *allocnodeA(void);
void freenodeA(node_t *n);

void asteroidTick(void);