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/* SDL BOUNCEY BALL!!
 *
 * TonyB <tonyb@tonybox.net>
 * Based on VB Code, suppose it would be good for teaching a VB user C.
 *
 *   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 2 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, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <stdio.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <SDL/SDL.h>

#ifdef _WIN32

#include <windows.h>

#define usleep(x) Sleep((x)/1000)

#else

#include <pthread.h>

#endif

#include <time.h>



int BallPosTop;

int BallPosLeft;

int VertAccel;

int HorizAccel;



SDL_Surface *screen;   





void DrawFrame(SDL_Surface* block, SDL_Surface* thescreen );



void Timer1() { // Vertical Acceleration

    BallPosTop = BallPosTop + VertAccel;

    if(BallPosTop >= (600 - 7)) { VertAccel = (-1 * VertAccel) - 5;}

    if(BallPosTop <= 0) { VertAccel = VertAccel * -1; }

}

void Timer2() {  // Horizontal Acceleration

    BallPosLeft = BallPosLeft + HorizAccel;

    if(BallPosLeft >= (800 - 7)) { HorizAccel = (-1 * HorizAccel) - 5; }

    if(BallPosLeft <= 0) { HorizAccel = HorizAccel * -1; }

}



void Timer3() { // Acceleration Limit

    if(HorizAccel >= 50) { HorizAccel = 50; }

    if(VertAccel >= 50) { VertAccel = 50; }

}



void Timer4() { // Gravity

    if(BallPosTop <= (600 - 7) )  { VertAccel = VertAccel + 5; }

}



#ifdef _WIN32 

DWORD WINAPI TimerThread( LPVOID lpParam )  {

#else

void *TimerThread(void *threadid) {

#endif

while(1) {

      Timer1(); 

      Timer2(); 

      Timer3();

      Timer4(); SDL_Delay(30);

}

}



void drawSprite(SDL_Surface* imageSurface, SDL_Surface* screenSurface, int srcX, int srcY, int dstX, int dstY, int width, int height)

{



	SDL_Rect srcRect;

	srcRect.x = srcX;

	srcRect.y = srcY;

	srcRect.w = width;

	srcRect.h = height;



	SDL_Rect dstRect;  

	dstRect.x = dstX;

	dstRect.y = dstY;

	dstRect.w = width;  

	dstRect.h = height;   

	SDL_BlitSurface(imageSurface, &srcRect, screenSurface, &dstRect);

}

#ifdef _WIN32

int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {



#else

int  main(int argc,  char *argv[]) {

#endif

	SDL_Event event;  

	int done = 0;

	

	if (SDL_Init(SDL_INIT_VIDEO) < 0) {  

		return 1;    

	}

	screen = SDL_SetVideoMode(800, 600, 32, SDL_SWSURFACE);

	if (!screen) {

		fprintf(stderr, "Couldn't set video mode: %s\n", SDL_GetError());

		return 1;

	}

	SDL_WM_SetCaption("Bouncey!", "Bouncey!");

	printf("SDL_LoadBMP [ block.bmp ]\r\n");	

	SDL_Surface* bitmap = SDL_LoadPNG("block.bmp"); 

	printf("SDL_LoadBMP [ back.bmp ]\r\n");	

	SDL_Surface* back = SDL_LoadBMP("back.bmp"); 

	//printf("SDL_LoadBMP [ lost_back.bmp ]\r\n");	

	//SDL_Surface* lost_back = SDL_LoadBMP("lost_back.bmp"); 



	printf("Seeding Random Number Generator\r\n");	

	srand(time(NULL));

	

	SDL_ShowCursor(SDL_ENABLE);

	#ifdef _WIN32 

	printf("Loading Game Thread.\r\n");	

    CreateThread(NULL, 0, TimerThread, NULL, 0, NULL);

	#else

	pthread_t ithread;

	pthread_t gthread;

	printf("Loading Game Thread.\r\n");	

	pthread_create(&ithread, NULL, TimerThread, NULL); 	

	#endif

	VertAccel = 20; HorizAccel = 20;

	

	while(1) { 

        SDL_PollEvent(&event);

        if(event.type==SDL_QUIT) { exit(0); } 

    	SDL_Flip(screen);

    	drawSprite(back, screen, 0, 0, 0, 0, back->w, back->h); // just-lost background		

		DrawFrame(bitmap, screen);

		SDL_Delay(20);  

	}

}



void DrawFrame(SDL_Surface* block, SDL_Surface* thescreen) {

     drawSprite(block, thescreen, 0, 0, BallPosLeft, BallPosTop, block->w, block->h);  // draw it.

}