starfighter/src/collectable.cpp

/*
Copyright (C) 2003 Parallel Realities
Copyright (C) 2011, 2012 Guus Sliepen
Copyright (C) 2015 Julian Marchant

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 3
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "Starfighter.h"

/*
Create a new collectable item based on supplied arguments.
*/
void collectable_add(float x, float y, int type, int value, int life)
{
	int r;

	if (type == P_ANYTHING)
	{
		type = P_CASH;

		r = rand() % 9;

		switch (r)
		{
			case 0:
				type = P_PLASMA_AMMO;
				break;
			case 1:
				type = P_SHIELD;
				break;
			case 2:
				type = P_ROCKET;
				value /= 10;
				break;
		}
	}
	else if (type == P_WEAPONS)
	{
		type = P_PLASMA_RATE;

		if ((game.difficulty == DIFFICULTY_NIGHTMARE) ||
			((game.difficulty != DIFFICULTY_EASY) &&
				(game.difficulty != DIFFICULTY_ORIGINAL) &&
				((game.area == MISN_MOEBO) ||
					(game.area == MISN_ELAMALE) ||
					(game.area == MISN_ELLESH) ||
					(game.area == MISN_EARTH))))
		{
			// Deny the Super Charge in Nightmare difficulty, and on bosses.
			r = rand() % 59;
		}
		else
			r = rand() % 61;

		if (r <= 19)
			type = P_PLASMA_DAMAGE;
		else if (r <= 39)
			type = P_PLASMA_SHOT;
		else if (r <= 59)
			type = P_PLASMA_RATE;
		else
			type = P_SUPER;
	}

	if (type == P_SUPER)
		value = MAX(value, 1);

	if (value == 0)
		return; // don't bother!

	// No point in giving the player plasma ammo if the weapons aren't
	// upgraded! Give them money instead.
	if (type == P_PLASMA_AMMO)
	{
		if ((weapon[W_PLAYER_WEAPON].reload[0] >= rate2reload[game.minPlasmaRate]) &&
			(weapon[W_PLAYER_WEAPON].ammo[0] <= game.minPlasmaOutput) &&
			(weapon[W_PLAYER_WEAPON].damage <= game.minPlasmaDamage))
		{
			type = P_CASH;
		}
	}

	// If the player has a charge cannon or a laser cannon, don't give them
	// rockets. Causes problems otherwise :)
	if (type == P_ROCKET)
	{
		if ((player.weaponType[1] == W_CHARGER) || (player.weaponType[1] == W_LASER))
		{
			type = P_CASH;
		}
	}

	// Shield bonus is useless in Nightmare difficulty; give cash instead.
	if (type == P_SHIELD)
	{
		if (game.difficulty == DIFFICULTY_NIGHTMARE)
		{
			type = P_CASH;
		}
	}

	if (game.difficulty == DIFFICULTY_ORIGINAL)
	{
		// Cash is just rare in the original game. You can still grind,
		// just not as much.
		if ((game.area == MISN_INTERCEPTION) && (type == P_CASH))
		{
			if (rand() % 10 > 0)
				return;
		}
	}
	else
	{
		// No cash or ammo on interceptions. Completely stops grinding.
		if ((game.area == MISN_INTERCEPTION) &&
			((type == P_CASH) || (type == P_PLASMA_AMMO) || (type == P_ROCKET)))
		{
			return;
		}
	}

	collectables *collectable = new collectables;

	collectable->next = NULL;
	collectable->active = true;
	collectable->x = x;
	collectable->y = y;

	collectable->dx = RANDRANGE(-100, 100);
	if (collectable->dx != 0)
		collectable->dx /= 100;

	collectable->dy = RANDRANGE(-100, 100);
	if (collectable->dy != 0)
		collectable->dy /= 100;

	collectable->type = type;
	collectable->value = value;
	collectable->life = life;

	switch(type)
	{
		case P_CASH:
			collectable->image = shape[24];
			break;

		case P_ROCKET:
			collectable->image = shape[49];
			break;

		case P_PLASMA_AMMO:
			collectable->image = shape[25];
			break;

		case P_SHIELD:
			collectable->image = shape[26];
			break;

		case P_PLASMA_SHOT:
			collectable->image = shape[27];
			break;

		case P_PLASMA_RATE:
			collectable->image = shape[28];
			break;

		case P_PLASMA_DAMAGE:
			collectable->image = shape[29];
			break;

		case P_CARGO:
			collectable->image = shape[32];
			break;

		case P_SUPER:
			collectable->image = shape[50];
			break;

		case P_MINE:
			collectable->image = shape[31];
			break;

		case P_SLAVES:
		case P_ESCAPEPOD:
			collectable->image = shape[45];
			break;

		case P_ORE:
			collectable->image = shape[46 + rand() % 3];
			break;
	}

	engine.collectableTail->next = collectable;
	engine.collectableTail = collectable;
}

bool collectable_collision(collectables *collectable, object *ship)
{
	float x0 = collectable->x;
	float y0 = collectable->y;
	float w0 = collectable->image->w;
	float h0 = collectable->image->h;

	float x2 = ship->x;
	float y2 = ship->y;
	float w1 = ship->image[0]->w;
	float h1 = ship->image[0]->h;

	float x1 = x0 + w0;
	float y1 = y0 + h0;

	float x3 = x2 + w1;
	float y3 = y2 + h1;

	return !(x1<x2 || x3<x0 || y1<y2 || y3<y0);
}

void collectable_explode(collectables *collectable)
{
	if ((collectable->x >= 0) && (collectable->x <= screen->w) &&
			(collectable->y >= 0) && (collectable->y <= screen->h))
		audio_playSound(SFX_EXPLOSION, collectable->x);

	for (int i = 0 ; i < 10 ; i++)
		explosion_add(collectable->x + rand() % 25 - rand() % 25,
			collectable->y + rand() % 25 - rand() % 25, E_BIG_EXPLOSION);

	player_checkShockDamage(collectable->x, collectable->y);
}