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/*

Copyright (c) 2015, Cong Xu

All rights reserved.

Redistribution and use in source and binary forms, with or without

modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this

list of conditions and the following disclaimer.

Redistributions in binary form must reproduce the above copyright notice,

this list of conditions and the following disclaimer in the documentation

and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE

LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

POSSIBILITY OF SUCH DAMAGE.

*/

#include "pickup.h"

#include <stdbool.h>

#include <string.h>

#include "game.h"

typedef struct

{

float x;

float y;

} Pickup;

#define PICKUP_RADIUS 0.15f

CArray Pickups;

Tex PickupTex = { NULL, 0, 0 };

void PickupsInit(void)

{

CArrayInit(&Pickups, sizeof(Pickup));

}

void PickupsFree(void)

{

CArrayTerminate(&Pickups);

}

void PickupsReset(void)

{

CArrayClear(&Pickups);

}

void PickupsAdd(const float x, const float y)

{

Pickup p;

memset(&p, 0, sizeof p);

p.x = x;

p.y = y + PICKUP_RADIUS;

CArrayPushBack(&Pickups, &p);

}

static bool PickupCollide(

Pickup *p, const float x, const float y, const float r);

bool PickupsCollide(const float x, const float y, const float r)

{

for (int i = 0; i < (int)Pickups.size; i++)

{

Pickup *p = CArrayGet(&Pickups, i);

// Remove pickups that are off the top of the screen

if (p->y > y + FIELD_HEIGHT * 2)

{

CArrayDelete(&Pickups, i);

continue;

}

if (PickupCollide(p, x, y, r))

{

CArrayDelete(&Pickups, i);

return true;

}

}

return false;

}

static bool PickupCollide(

Pickup *p, const float x, const float y, const float r)

{

const float dx = p->x - x;

const float dy = p->y - y;

const float d2 = dx * dx + dy * dy;

const float rTotal = r + PICKUP_RADIUS;

const float r2 = rTotal * rTotal;

return d2 <= r2;

}

static void PickupDraw(const Pickup *p, const float y);

void PickupsDraw(const float y)

{

for (int i = 0; i < (int)Pickups.size; i++)

{

PickupDraw(CArrayGet(&Pickups, i), y);

}

}

static void PickupDraw(const Pickup *p, const float y)

{

SDL_Rect dest = {

(int)SCREEN_X(p->x) - PickupTex.W / 2,

(int)(SCREEN_Y(p->y) - PickupTex.H / 2 - y),

PickupTex.W, PickupTex.H

};

RenderTex(PickupTex.T, NULL, &dest);

}