Code-Bin #489 - allegro temp

allegro temp
Posted by: olx | February 7, 2010 @ 4:21pm

C++ Code

// You must include the Allegro Header file
#include <allegro.h>
#include <string>

const int SCREEN_WIDTH=1280;
const int SCREEN_HEIGHT=768;
const int COLOR_DEPTH=32;
typedef BITMAP *BITMAP_PTR;

/*TIMER STUFF*/
volatile long speed_counter = 0;
void increment_speed_counter() //A function to increment the speed counter
{
	speed_counter++; // This will just increment the speed counter by one. :)
}
END_OF_FUNCTION(increment_speed_counter); //Make sure you tell it that it's the end of the
										  //function

//functions
int FAILED(int test)
{
	return test;
}

void error(const std::string& message)
{
        set_gfx_mode(GFX_TEXT,0,0,0,0); //Set the screen mode for allegro messages
        allegro_message(message.c_str());
        exit(EXIT_FAILURE);
}

class Game
{
private:
	BITMAP *background;
	BITMAP *buffer;
	BITMAP *frame1;
    BITMAP *frame2;
    BITMAP *frame3;
    BITMAP *ball;

//variables
	int guy_x;
	int guy_y;
	int ball_x;
	int ball_y;
	int frame_counter;

//flags

int show_bbox;
	int collision;

//boundingboxes
	int ball_bb_left;
    int ball_bb_top;
    int ball_bb_right;
    int ball_bb_bottom;

int guy_bb_left;
    int guy_bb_top;
    int guy_bb_right;
    int guy_bb_bottom;

//member functions
    void check_frame();
    void choose_blit();
    void loadc_bitmap(BITMAP_PTR& bmp,const std::string& filename);
    void draw_boxes();
    void col_detect();
public:

Game();
	~Game();

void play();
};

//Game class functions
void Game::play()
{
//logic
    while(speed_counter>0)
    {
        //key checks for guy
        if(key[KEY_RIGHT]) // If the user hits the right key, change the picture's X coordinate
        {
            guy_x+=3; // Moving right so up the X coordinate by 3
        }
        if(key[KEY_LEFT]) // Ditto' - only for left key
        {
            guy_x-=3; // Moving left, so lower the X coordinate by 3
        }
        if(key[KEY_UP]) // If the user hits the up key, change the picture's Y coordinate
        {
            guy_y -=3; // Moving up, so lower the Y coordinate by 3
        }
        if(key[KEY_DOWN]) // Ditto' - only for down
        {
            guy_y +=3; // Moving down, so up the Y coordinate by 3
        }

//key checks for ball
        if(key[KEY_D]) // If the user hits the right key, change the picture's X coordinate
        {
            ball_x+=3; // Moving right so up the X coordinate by 3
        }
        if(key[KEY_A]) // Ditto' - only for left key
        {
            ball_x-=3; // Moving left, so lower the X coordinate by 3
        }
        if(key[KEY_W]) // If the user hits the up key, change the picture's Y coordinate
        {
            ball_y -=3; // Moving up, so lower the Y coordinate by 3
        }
        if(key[KEY_S]) // Ditto' - only for down
        {
            ball_y +=3; // Moving down, so up the Y coordinate by 3
        }
        //bbox stuff
        if(key[KEY_SPACE])
        {
            show_bbox = TRUE;
        }

else if(!key[KEY_SPACE])
        {
            show_bbox = FALSE;
        }
        //update the bboxes
        ball_bb_left = ball_x;
        ball_bb_top = ball_y;
        ball_bb_right = (ball_x + (ball->w));
        ball_bb_bottom = (ball_y + (ball->h));

guy_bb_left = guy_x;
        guy_bb_top = guy_y;
        guy_bb_right = (guy_x + (frame1->w));
        guy_bb_bottom = (guy_y + (frame1->h));
        //check for collisions
        col_detect();
        //counter
        speed_counter--;
        frame_counter++;
        check_frame();
    }

choose_blit(); // Draw the right frame to the buffer

if(show_bbox == TRUE)
    {
        draw_boxes();
    }

if(collision == TRUE)
    {
        textprintf_ex(buffer, font, 10,10, makecol(255,0,255), -1, "Collision!");
    }

blit(buffer, screen, 0,0,0,0,SCREEN_WIDTH,SCREEN_HEIGHT); // Draw the buffer to the screen
    clear_bitmap(buffer);
// Blits to primary buffer. screen=primary buffer?
}

void Game::loadc_bitmap(BITMAP_PTR& bmp,const std::string& filename)
{
    bmp=load_bitmap(filename.c_str(), NULL);//Load image 1

if(bmp == NULL)
    {
        set_gfx_mode(GFX_TEXT,0,0,0,0); //Set the screen mode for allegro messages
        allegro_message("Failed to load bitmap %s",filename.c_str());
        exit(EXIT_FAILURE);
    }

}

void Game::choose_blit()
{
    blit(background,buffer, 0,0,0,0,SCREEN_WIDTH,SCREEN_HEIGHT);

if(frame_counter < 30) // Less than a full second
    {
        draw_sprite(buffer, frame1, guy_x, guy_y); // Draw the first frame
    }
    else if(frame_counter >= 30 && frame_counter < 60) // Between 1 and 2 seconds
    {
        draw_sprite(buffer, frame2, guy_x, guy_y); // Draw the second frame
    }
    else if(frame_counter >= 60 && frame_counter < 90) // If we are between 2 and 3 seconds
    {
        draw_sprite(buffer, frame1, guy_x, guy_y); // Draw the first frame again,
                                                        // to acheive better effect
    }
    else // If we are over 3 seconds
    {
        draw_sprite(buffer, frame3, guy_x, guy_y); // Draw the last frame.
    }
    draw_sprite(buffer, ball, ball_x, ball_y);
}

void Game::check_frame()
{
    if(frame_counter>120)
    {
        frame_counter=0;
    }
}

void Game::draw_boxes()
{
    line(buffer, guy_bb_left, guy_bb_top, guy_bb_right, guy_bb_top, makecol(255,0,0));
    line(buffer, guy_bb_left, guy_bb_bottom, guy_bb_right, guy_bb_bottom, makecol(255,0,0));
    line(buffer, guy_bb_left, guy_bb_top, guy_bb_left, guy_bb_bottom, makecol(255,0,0));
    line(buffer, guy_bb_right, guy_bb_top, guy_bb_right, guy_bb_bottom, makecol(255,0,0));

line(buffer, ball_bb_left, ball_bb_top, ball_bb_right, ball_bb_top, makecol(255,0,0));
    line(buffer, ball_bb_left, ball_bb_bottom, ball_bb_right, ball_bb_bottom, makecol(255,0,0));
    line(buffer, ball_bb_left, ball_bb_top, ball_bb_left, ball_bb_bottom, makecol(255,0,0));
    line(buffer, ball_bb_right, ball_bb_top, ball_bb_right, ball_bb_bottom, makecol(255,0,0));
}

void Game::col_detect()
{
        collision = TRUE; // Assume that there is no collision
        // NOTE: This could easily be concatenated into one big if statement across
        //	 four 'or' clauses -- but it's split up this way for easy reading
        if(guy_bb_bottom < ball_bb_top)
        {
            collision = FALSE;
        }
        else if(guy_bb_top > ball_bb_bottom)
        {
            collision = FALSE;
        }
        else if(guy_bb_right < ball_bb_left)
        {
            collision = FALSE;
        }
        else if(guy_bb_left > ball_bb_right)
        {
            collision = FALSE;
        }

}

//Game class constructor and destructor
Game::Game()
{

//Loading a pic into the empty BITMAP structure
    loadc_bitmap(background,"background.bmp");
    loadc_bitmap(frame1,"frame1.bmp");
    loadc_bitmap(frame2,"frame2.bmp");
    loadc_bitmap(frame3,"frame3.bmp");
    loadc_bitmap(ball,"ball.bmp");
    //just creating an empty bitmap for main buffer
    buffer = create_bitmap(SCREEN_WIDTH,SCREEN_HEIGHT);
    if(buffer == NULL)
    {
        set_gfx_mode(GFX_TEXT,0,0,0,0);
        allegro_message("Could not create buffer!");
        exit(EXIT_FAILURE);
    }

//initialize variables
    show_bbox = FALSE;
    collision = FALSE;
    frame_counter = 0;

guy_x = SCREEN_WIDTH/2;
	guy_y = SCREEN_HEIGHT/2;
    ball_x = 100;
    ball_y = 200;

//initialize bboxes
    ball_bb_left = ball_x;
    ball_bb_top = ball_y;
    ball_bb_right = (ball_x + ball->w);
    ball_bb_bottom = (ball_y + ball->h);

guy_bb_left = guy_x;
    guy_bb_top = guy_y;
    guy_bb_right = (guy_x + frame1->w);
    guy_bb_bottom = (guy_y + frame1->h);

}

Game::~Game()
{
    destroy_bitmap(background);//free mem
    destroy_bitmap(buffer);
    destroy_bitmap(frame1);//Release the bitmap data
    destroy_bitmap(frame2);//Release the bitmap data
    destroy_bitmap(frame3);//Release the bitmap data
    destroy_bitmap(ball);
}

//Main
int main(int argc, char *argv[])
{
    if(FAILED(allegro_init()))
    {
        error("\nFailed allegro INIT");
    }
    if(FAILED(install_keyboard()))
    {
        error("\nFailed to install keyboard");
    }

LOCK_VARIABLE(speed_counter); //Used to set the timer - which regulates the game's
    LOCK_FUNCTION(increment_speed_counter);//speed
    install_int_ex(increment_speed_counter, BPS_TO_TIMER(60));

set_color_depth(COLOR_DEPTH);

if(FAILED(install_timer()))
    {
        error("\nFailed to install timer");
    }
	if(FAILED(set_gfx_mode(GFX_AUTODETECT_WINDOWED, SCREEN_WIDTH, SCREEN_HEIGHT, 0 ,0)))
	{
		error("\nFailed to set gfx mode");
	}

//Main game loop goes here with init and destruct
    Game game;
    while(!key[KEY_ESC])
    {
        game.play();
    }
    return 0;
}
END_OF_MAIN()//Allegro specific weirdness

Syntax Highlighting

[Open in new window]

Author Comments

none

Rating

4.52 / 8
54 Votes