libRocket/Samples/invaders/src/Shield.cpp

/*
 * This source file is part of libRocket, the HTML/CSS Interface Middleware
 *
 * For the latest information, see http://www.librocket.com
 *
 * Copyright (c) 2008-2010 CodePoint Ltd, Shift Technology Ltd
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 */

#include "Shield.h"
#include <Rocket/Core/Math.h>
#include <ShellOpenGL.h>
#include "Game.h"
#include "GameDetails.h"
#include "Sprite.h"

const int MAX_HEALTH = 4;

Shield::Shield(Game* _game, ShieldType _type) : position(0,0)
{
	game = _game;
	type = _type;
	health = MAX_HEALTH;

	InitialiseCells();
}

Shield::~Shield()
{
}

void Shield::InitialiseCells()
{
	if (type == REGULAR || type == TOP_LEFT || type == TOP_RIGHT)
	{
		for (int i = 0; i < NUM_SHIELD_CELLS; i++)
		{
			for (int j = 0; j < NUM_SHIELD_CELLS; j++)
			{
				shield_cells[i][j] = ON;
			}
		}

		// Take the bites out of the cells if they're a corner cell:
		if (type == TOP_LEFT)
		{
			for (int x = 0; x < NUM_SHIELD_CELLS - 1; x++)
			{
				for (int y = 0; y < (NUM_SHIELD_CELLS - 1) - x; y++)
					shield_cells[x][y] = OFF;
			}
		}

		else if (type == TOP_RIGHT)
		{
			for (int x = 0; x < NUM_SHIELD_CELLS - 1; x++)
			{
				for (int y = 0; y < (NUM_SHIELD_CELLS - 1) - x; y++)
					shield_cells[(NUM_SHIELD_CELLS - 1) - x][y] = OFF;
			}
		}
	}
	else
	{
		for (int i = 0; i < NUM_SHIELD_CELLS; i++)
		{
			for (int j = 0; j < NUM_SHIELD_CELLS; j++)
			{
				shield_cells[i][j] = OFF;
			}
		}

		if (type == BOTTOM_LEFT)
		{
			for (int x = 0; x < NUM_SHIELD_CELLS - 1; x++)
			{
				for (int y = 0; y < (NUM_SHIELD_CELLS - 1) - x; y++)
					shield_cells[(NUM_SHIELD_CELLS - 1) - x][y] = ON;
			}
		}

		else if (type == BOTTOM_RIGHT)
		{
			for (int x = 0; x < NUM_SHIELD_CELLS - 1; x++)
			{
				for (int y = 0; y < (NUM_SHIELD_CELLS - 1) - x; y++)
					shield_cells[x][y] = ON;
			}
		}
	}
}

void Shield::SetPosition(const Rocket::Core::Vector2f& _position)
{
	position = _position;
}

const Rocket::Core::Vector2f& Shield::GetPosition() const
{
	return position;
}

void Shield::Render()
{
	if (health > 0)
	{
		glPointSize((GLfloat) PIXEL_SIZE);
		glDisable(GL_TEXTURE_2D);
		glColor4ubv(GameDetails::GetDefenderColour());

		glBegin(GL_POINTS);

		for (int i = 0; i < NUM_SHIELD_CELLS; i++)
		{
			for (int j = 0; j < NUM_SHIELD_CELLS; j++)
			{
				if (shield_cells[i][j] == ON)
				{
					Rocket::Core::Vector2f cell_position = position + Rocket::Core::Vector2f((float) (PIXEL_SIZE * i), (float) (PIXEL_SIZE * j));
					glVertex2f(cell_position.x, cell_position.y);
				}
			}
		}

		glEnd();

		glEnable(GL_TEXTURE_2D);
	}
}

bool Shield::CheckHit(const Rocket::Core::Vector2f& check_position)
{
	float sprite_size = PIXEL_SIZE * NUM_SHIELD_CELLS;

	// If we're alive and the position is within our bounds, set ourselves
	// as exploding and return a valid hit
	if (health > 0
		&& check_position.x >= position.x
		&& check_position.x <= position.x + sprite_size
		&& check_position.y >= position.y
		&& check_position.y <= position.y + sprite_size)
	{
		// Take damage.
		SustainDamage();

		return true;
	}

	return false;
}

void Shield::SustainDamage()
{
	health--;

	if (health > 0)
	{
		int num_shields_to_lose = (NUM_SHIELD_CELLS * NUM_SHIELD_CELLS) / MAX_HEALTH;
		while (num_shields_to_lose > 0)
		{
			int x = Rocket::Core::Math::RandomInteger(NUM_SHIELD_CELLS);
			int y = Rocket::Core::Math::RandomInteger(NUM_SHIELD_CELLS);
			if (shield_cells[x][y] != DESTROYED)
			{
				shield_cells[x][y] = DESTROYED;
				num_shields_to_lose--;
			}
		}
	}
}