/*

• Copyright (c) 2006-2007 Erin Catto http://www.gphysics.com

*

• This software is provided 'as-is', without any express or implied

• warranty. In no event will the authors be held liable for any damages

• arising from the use of this software.

• Permission is granted to anyone to use this software for any purpose,

• including commercial applications, and to alter it and redistribute it

• freely, subject to the following restrictions:

• 1. The origin of this software must not be misrepresented; you must not

• claim that you wrote the original software. If you use this software

• in a product, an acknowledgment in the product documentation would be

• appreciated but is not required.

• 2. Altered source versions must be plainly marked as such, and must not be

• misrepresented as being the original software.

• 3. This notice may not be removed or altered from any source distribution.

*/

#include <Box2D/Box2D.h>
#include <allegro5\allegro.h>
#include <allegro5\allegro_image.h>
#include <cstdio>

const float32 SCALE(30.0f);
const int HEIGHT(480);
const int WIDTH(640);
// This is a simple example of building and running a simulation
// using Box2D. Here we create a large ground box and a small dynamic
// box.
// There are no graphics for this example. Box2D is meant to be used
// with your rendering engine in your game engine.
int main(int argc, char** argv)
{
B2_NOT_USED(argc);
B2_NOT_USED(argv);

// Define the gravity vector.
b2Vec2 gravity(0.0f, 10.0f);

// Do we want to let bodies sleep?
bool doSleep = true;

// Construct a world object, which will hold and simulate the rigid bodies.
b2World world(gravity, doSleep);

// Define the ground body.
b2BodyDef groundBodyDef;
groundBodyDef.position.Set(0.0f / SCALE, 420.0f / SCALE);

// Call the body factory which allocates memory for the ground body
// from a pool and creates the ground box shape (also from a pool).
// The body is also added to the world.
b2Body* groundBody = world.CreateBody(&groundBodyDef);

// Define the ground box shape.
b2PolygonShape groundBox;

// The extents are the half-widths of the box.
groundBox.SetAsBox(50.0f / SCALE, 10.0f / SCALE);

// Add the ground fixture to the ground body.
groundBody->CreateFixture(&groundBox, 0.0f);

// Define the dynamic body. We set its position and call the body factory.
b2BodyDef bodyDef;
bodyDef.type = b2_dynamicBody;
bodyDef.position.Set(0.0f / SCALE, 4.0f / SCALE);
b2Body* body = world.CreateBody(&bodyDef);

// Define another box shape for our dynamic body.
b2PolygonShape dynamicBox;
dynamicBox.SetAsBox(30.0f / SCALE, 30.0f / SCALE);

// Define the dynamic body fixture.
b2FixtureDef fixtureDef;
fixtureDef.shape = &dynamicBox;

// Set the box density to be non-zero, so it will be dynamic.
fixtureDef.density = 1.0f;

// Override the default friction.
fixtureDef.friction = 0.3f;

fixtureDef.restitution = 0.4f;
// Add the shape to the body.
body->CreateFixture(&fixtureDef);

// Prepare for simulation. Typically we use a time step of 1/60 of a
// second (60Hz) and 10 iterations. This provides a high quality simulation
// in most game scenarios.
float32 timeStep = 1.0f / 60.0f;
int32 velocityIterations = 6;
int32 positionIterations = 2;

al_init();
al_init_image_addon();
ALLEGRO_DISPLAY *display(al_create_display(WIDTH, HEIGHT));
//ALLEGRO_BITMAP *ground(al_create_bitmap((50.0f / SCALE) * 2 * SCALE, (10.0f / SCALE) * 2 * SCALE));
ALLEGRO_BITMAP *ground(al_create_bitmap(100, 20));
al_set_target_bitmap(ground);
al_clear_to_color(al_map_rgb(255,255,255));
//ALLEGRO_BITMAP *box(al_create_bitmap((10.0f / SCALE) * 2 * SCALE, (10.0f / SCALE) * 2 * SCALE));
ALLEGRO_BITMAP *box(al_create_bitmap(60, 60));

al_set_target_bitmap(box);
al_clear_to_color(al_map_rgb(255, 0, 255));
al_set_target_bitmap(al_get_backbuffer(display));
al_clear_to_color(al_map_rgb(0,0,0));
al_flip_display();
// This is our little game loop.
for (int32 i = 0; true; ++i)
{
al_clear_to_color(al_map_rgb(0,0,0));
// Instruct the world to perform a single step of simulation.
// It is generally best to keep the time step and iterations fixed.
world.Step(timeStep, velocityIterations, positionIterations);

// Clear applied body forces. We didn't apply any forces, but you
// should know about this function.
world.ClearForces();

// Now print the position and angle of the body.
b2Vec2 position = body->GetPosition();
b2Vec2 groundPos = groundBody->GetPosition();
float32 angle = body->GetAngle();

al_draw_bitmap(ground, groundPos.x * SCALE, groundPos.y * SCALE, 0);
//al_draw_bitmap(box, position.x * SCALE , position.y * SCALE - 20, 0);
al_draw_bitmap(box, position.x * SCALE , position.y * SCALE, 0);
al_flip_display();
al_rest(1.0 / 60.0);
printf("%4.2f %4.2f %4.2f\n", position.x, position.y, angle);
}

// When the world destructor is called, all bodies and joints are freed. This can
// create orphaned pointers, so be careful about your world management.

return 0;
}