#include <stdio.h>

#include <SDL/SDL.h>

#include <stdlib.h>

#include "audio.h"

struct obj {

int x, y;

int dx, dy;

};

typedef struct obj bus_obj;

typedef struct obj man_obj;

bus_obj psv, priv1, priv2;

man_obj passenger;

static SDL_Surface* screen;

static SDL_Surface* bus;

static SDL_Surface* man;

static SDL_Surface* man2;

static SDL_Surface* car1;

static SDL_Surface* car2;

void init_bus()

{

psv.y = 240;

psv.x = 639;

psv.dx = -6;

return;

}

void init_man()

{

passenger.y = 250;

passenger.x = 0;

passenger.dx = 3;

return;

}

void init_cars()

{

priv1.x = priv2.x = screen->w/2;

priv1.y = psv.y + 3;

priv2.y = psv.y + 5;

priv1.dx = -7; priv2.dx = 7;

}

void move_obj(struct obj* obj)

{

obj->x += obj->dx;

return;

}

void draw_obj(struct obj* obj, SDL_Surface* surf)

{

SDL_Rect src, dest;

src.x = 0;

src.y = 0;

src.h = surf->h;

src.w = surf->w;

dest.x = obj->x - surf->w/2;

dest.y = obj->y - surf->h/2;

dest.w = surf->w;

dest.h = surf->h;

SDL_BlitSurface(surf, &src, screen, &dest);

return;

}

void draw_man()

{

SDL_Rect src, dest;

src.x = 0;

src.y = 0;

src.h = man->h;

src.w = man->w;

dest.x = passenger.x - man->w/2;

dest.y = passenger.y - man->h/2;

dest.w = man->w;

dest.h = man->h;

if (1) {

if (passenger.x % 12 == 9)

SDL_BlitSurface(man2, &src, screen, &dest);

else

SDL_BlitSurface(man, &src, screen, &dest);

}

return;

}

int main()

{

SDL_Surface* background, *background2, *background3, *background4;

SDL_Rect src, dest;

int frames;

Uint32 colorkey;

SDL_AudioSpec desired, obtained;

sound_t bus_sound;

/*initialize video and sound subsystem*/

if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) != 0){

printf("Unable to initialize video: %s\n.", SDL_GetError());

return 1;

}

/*ensure all subsystems exit safely*/

atexit(SDL_Quit);

atexit(SDL_CloseAudio);

/*set video mode*/

screen = SDL_SetVideoMode(640, 480, 16, SDL_DOUBLEBUF | SDL_HWSURFACE);

if (screen == NULL) {

printf("Unable to set video mode: %s\n", SDL_GetError());

return 1;

}

/*load background images*/

background = SDL_LoadBMP("img/src.bmp");

if (background == NULL) {

printf("Unable to load image.");

return 1;

}

background2 = SDL_LoadBMP("img/background2.bmp");

if (background2 == NULL) {

printf("Unable to load background2.");

return 1;

}

background3 = SDL_LoadBMP("img/background3.bmp");

if (background3 == NULL) {

printf("Unable to load background3.");

return 1;

}

background4 = SDL_LoadBMP("img/background4.bmp");

if (background4 == NULL) {

printf("Unable to load background4.");

return 1;

}

/*load bus*/

bus = SDL_LoadBMP("img/bus.bmp");

if (bus == NULL) {

printf("Unable to load image.");

return 1;

}

colorkey = SDL_MapRGB(bus->format, 255, 255, 255);

/*set color key*/

SDL_SetColorKey(bus,

SDL_SRCCOLORKEY,

colorkey);

/*load man*/

man = SDL_LoadBMP("img/man.bmp");

if (man == NULL) {

printf("Unable to load image");

return 1;

}

colorkey = SDL_MapRGB(man->format, 255, 255, 255);

/*set color key*/

SDL_SetColorKey(man,

SDL_SRCCOLORKEY,

colorkey);

man2 = SDL_LoadBMP("img/man2.bmp");

if (man2 == NULL) {

printf("Unable to load image");

return 1;

}

colorkey = SDL_MapRGB(man2->format, 255, 255, 255);

/*set color key*/

SDL_SetColorKey(man2,

SDL_SRCCOLORKEY,

colorkey);

car1 = SDL_LoadBMP("img/car1.bmp");

if (car1 == NULL) {

printf("Unable to load image");

return 1;

}

colorkey = SDL_MapRGB(car1->format, 255, 255, 255);

/*set color key*/

SDL_SetColorKey(car1,

SDL_SRCCOLORKEY,

colorkey);

car2 = SDL_LoadBMP("img/car2.bmp");

if (car2 == NULL) {

printf("Unable to load image");

return 1;

}

colorkey = SDL_MapRGB(car2->format, 255, 255, 255);

/*set color key*/

SDL_SetColorKey(car2,

SDL_SRCCOLORKEY,

colorkey);

//open audio device

desired.freq = 44100;

desired.format = AUDIO_S16;

desired.samples = 4096;

desired.channels = 2;

desired.callback = AudioCallback;

desired.userdata = NULL;

if (SDL_OpenAudio(&desired, &obtained) < 0) {

printf("Unable to open audio device: %s\n", SDL_GetError());

return 1;

}

//load sound files and convert them to sound card's format

if (LoadAndConvertSound("audio/bus-pass.wav", &obtained, &bus_sound) != 0) {

printf("Unable to load sound.\n");

return 1;

}

ClearPlayingSounds();

SDL_PauseAudio(0);

init_bus();

init_man();

int passenger_in = 0;

PlaySound(&bus_sound);

while (psv.x > 0) {

src.x = 0;

src.y = 0;

src.w = background->w;

src.h = background->h;

dest = src;

SDL_BlitSurface(background, &src, screen, &dest);

draw_obj(&psv, bus);

if (psv.x < screen->w/2 && !passenger_in) { /*pause bus for passenger to enter*/

SDL_PauseAudio(1);

if (passenger.x > psv.x + 40){ /*check if passenger has got in*/

passenger_in = 1; SDL_PauseAudio(0);

}

draw_man();

SDL_Flip(screen);

move_obj(&passenger);

} else {

SDL_Flip(screen);

move_obj(&psv);

}

}

psv.x = 639; psv.y = 320;

init_cars();

PlaySound(&bus_sound);

while (psv.x + bus->w/2 > 0) {

SDL_BlitSurface(background2, &src, screen, &dest);

draw_obj(&priv1, car1); draw_obj(&priv2, car2);

draw_obj(&psv, bus);

SDL_Flip(screen);

move_obj(&psv);

move_obj(&priv1); move_obj(&priv2);

}

psv.x = 639; psv.y = 350;

PlaySound(&bus_sound);

while (psv.x + bus->w/2 > 0) {

SDL_BlitSurface(background3, &src, screen, &dest);

draw_obj(&psv, bus);

SDL_Flip(screen);

move_obj(&psv);

}

psv.x = 639; psv.y = 267; passenger.y = 270;

passenger_in = 1;

int has_paused = 0;

PlaySound(&bus_sound);

while (psv.x + bus->w/2 > 0) {

SDL_BlitSurface(background4, &src, screen, &dest);

if (screen->w/2 > psv.x && passenger_in == 1) {

SDL_PauseAudio(1);

if (has_paused == 0) { SDL_Delay(1000); has_paused = 1;}

if (passenger.x > 639) {passenger_in = 0; SDL_PauseAudio(0);}

draw_obj(&psv, bus);

draw_man();

SDL_Flip(screen);

move_obj(&passenger);

} else {

draw_obj(&psv, bus);

SDL_Flip(screen);

move_obj(&psv);

}

}

//pause and lock sound system

SDL_PauseAudio(1);

SDL_LockAudio();

free(bus_sound.samples);

SDL_UnlockAudio();

SDL_FreeSurface(background4);

SDL_FreeSurface(background3);

SDL_FreeSurface(background2);

SDL_FreeSurface(background);

SDL_FreeSurface(man);

SDL_FreeSurface(bus);

return 0;

}