// Pong Clone Jason Lovett#include "pong.h"	//include pong.h//increment logic_countervoid update_logic_counter(){	logic_counter++;}END_OF_FUNCTION(update_logic_counter);	//Needed in timing functions, to keep portabilityint angle(){	switch(ballspeedx)	{		case 2 :	//if ballspeedx is 4		{			int centreofball = ballleft + (ballwidth / 2);			//find centre of ball			int centreofpaddle = paddle1left + (paddlewidth / 2);	//find centre of paddle			angleofreflection = 45 * ((centreofpaddle - centreofball) / (paddlewidth / 2)); //convert to angle between 45 and -45			break;		}		case -2 :	//if ballspeedx is -4		{			int centreofball = ballleft + (ballwidth / 2);			//find centre of ball			int centreofpaddle = paddle2left + (paddlewidth / 2);	//find centre of paddle			angleofreflection = 45 * ((centreofpaddle - centreofball) / (paddlewidth / 2)); //convert to angle between 45 and -45			break;		}	}	return roundfloat(angleofreflection);}//check for collisionsint CollisionDetect(){	if((ballleft <= paddle1right) && (ballbottom >= paddle1top) && (ballright >= paddle1left) && (balltop <= paddle1bottom))	//if ball is within paddle1	{		ballspeedx = 4;		//invert xdir		ballspeedy = angle();	//calculate yspeed	}	if((ballright <= paddle2left) && (ballbottom >= paddle2top) && (ballleft <= paddle2right) && (balltop <= paddle2bottom))	//if ball is within paddle2	{		ballspeedx = -4;	//invert xdir		ballspeedy = angle();//calculate yspeed	}	if(ballright >= SCREEN_W)	{		RePosition();		p1score++;	}	if(ballleft <= 0)	{		RePosition();		p2score++;	}	return 0;}int PaddleMove(){	if(key[KEY_UP])		paddle2top -= 4;	if(key[KEY_DOWN])		paddle2top += 4;	if(key[KEY_W])		paddle1top -= 4;	if(key[KEY_S])		paddle1top += 4;	return 0;}int BallMove(){	ballleft += ballspeedx;	balltop += ballspeedy;	return 0;}int RePosition(){	balltop = (SCREEN_H / 2 + (rand()%36)) - (ballwidth / 2);	ballleft = SCREEN_W / 2 - (ballwidth / 2);	int rand1 = (rand()%1)+1;	if (rand1 == 1)	{		ballspeedx = 2;	}	else	{		ballspeedx = -2;	}	return 0;}//draw the graphics to the buffer the blit to the screenint DrawGraphics(BITMAP *buffer){	clear_bitmap(buffer); //make sure the bitmap is blank before drawing	rectfill(buffer, paddle1left, paddle1top, paddle1right, paddle1bottom, makecol(255,255,255));	rectfill(buffer, paddle2left, paddle2top, paddle2right, paddle2bottom, makecol(255,255,255));	circlefill(buffer, ballleft, balltop, (ballwidth / 2), makecol(255,255,255));	blit(buffer, screen, 0, 0, 0, 0, SCREEN_W, SCREEN_H); //blit to screen (double buffering)	return 0; //success}//mainint main(int argv, char **argc[]){	allegro_init();		//initialise allegro	install_timer();	//initialise timer routines	install_keyboard();	//initialise keyboard routines		srand(time(NULL));	//seed the rand runction with the time to get better random numbers		set_color_depth(16);	//set colour depth	set_gfx_mode(GFX_AUTODETECT_WINDOWED, 640, 480, 0, 0);	//set graphics mode to fullscreen 640x480		sint quitit = 0;			//quit variable	p1score = 0;	p2score = 0;		LOCK_VARIABLE(logic_counter);	//needed on timing variables to keep portability	LOCK_FUNCTION(update_logic_counter);	//needed on timing functions to keep portability	install_int_ex(update_logic_counter, BPS_TO_TIMER(60));	//set the timer rate to 60 frames per second (tick per second)		BITMAP *buffer = create_bitmap(640, 480);		//create buffer bitmap for extra speed	clear_bitmap(buffer);		//make sure the bitmap is empty		paddle2top = (SCREEN_H/2 - paddlewidth);		//set paddle2top	paddle2left = (SCREEN_W - paddlewidth - 10);	//set paddle2left	paddle1top = (SCREEN_H/2 - paddlewidth);		//set paddle1top	paddle1left = paddlewidth;						//set paddle1left		RePosition();				//set the starting point for the ball	ballspeedy = 1;		while(!quitit)			//if quitit = 0 loop	{		while(logic_counter)	///if logic_counter is 1 loop		{			ballbottom = balltop + ballwidth;		//set ballbottom			ballright = ballleft + ballwidth;		//set ballright			paddle1bottom = paddle1top + paddlehieght;		//set paddle1bottom			paddle1right = paddle1left + paddlewidth;		//set paddle1right			paddle2bottom = paddle2top + paddlehieght;		//set paddle2bottom			paddle2right = paddle2left + paddlewidth;		//set paddle2right			CollisionDetect();			//call the collision detection routine			PaddleMove();				//call the paddle move routine			BallMove();					//call the ball move routine			DrawGraphics(buffer);		//call the draw grpahics routine and pass the bitmap buffer			logic_counter--;			//decrement logic_counter		}		if(key[KEY_ESC]) quitit++;		//if esc is pressed then the loop will quit	}	destroy_bitmap(buffer);				//release the buffer bitmap memory	return 0;			//success}END_OF_MAIN();	//needed to keep portability///~

//Pong Clone, Jason Lovett#include <allegro.h>	//include allegro header#include <stdlib.h>		//for rand#include <time.h>		//use for paramater to srand to get a more random number#include <roundfloat.h>	//round the angle float to an int to get a valid ballyspeedtypedef short int sint;	//type sint instead of short inttypedef long int lint;	//type lint instead of long intfloat angleofreflection;sint ballspeedx;sint ballspeedy;const sint paddlewidth = 16;const sint ballwidth = 8;const sint paddlehieght = 40;sint paddle1top, paddle2top, balltop;sint paddle1left, paddle2left, ballleft;sint paddle1bottom, paddle2bottom, ballbottom;sint paddle1right, paddle2right, ballright;sint paddlehity;sint p1score, p2score;volatile sint logic_counter;int CollisionDetect();				//CollisionDetect declaration	//doneint Angle();						//Angle declaration		//doneint PaddleMove();					//PaddleMove declaration	//doneint BallMove();						//BallMove declaration		//doneint RePosition();					//RePosition declaration	//doneint DrawGraphics(BITMAP *buffer);	//DrawGraphics declaration	//done///~

int angle(){	switch(ballspeedx)	{		case 2 :	//if ballspeedx is 4		{			int centreofball = ballleft + (ballwidth / 2);			//find centre of ball			int centreofpaddle = paddle1left + (paddlewidth / 2);	//find centre of paddle			angleofreflection = 45 * ((centreofpaddle - centreofball) / (paddlewidth / 2)); //convert to angle between 45 and -45			break;		}		case -2 :	//if ballspeedx is -4		{			int centreofball = ballleft + (ballwidth / 2);			//find centre of ball			int centreofpaddle = paddle2left + (paddlewidth / 2);	//find centre of paddle			angleofreflection = 45 * ((centreofpaddle - centreofball) / (paddlewidth / 2)); //convert to angle between 45 and -45			break;		}	}	return roundfloat(angleofreflection);}