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Project: Pong

A project for Systems Programming by Alex Hughes during the Spring 2013.

This project was begun on 4/10/2013 and took 6 weeks.

Objectives

State the purpose of this project. What is the point of this project? What do we hope to accomplish by undertaking it?

SDL_PONG For Systems Programming

Prerequisites

In order to successfully accomplish/perform this project, the listed resources/experiences need to be consulted/achieved: 

SDL Tutorials 1-18

Background

State the idea or purpose of the project. What are you attempting to pursue?

Upon approval, you'll want to fill this section out with more detailed background information. DO NOT JUST PROVIDE A LINK.

Providing any links to original source material, such as from a project page, is a good idea.

You'll want to give a general overview of what is going to be accomplished (for example, if your project is about installing a web server, do a little write-up on web servers. What is it, why do we need one, how does it work, etc.)

Scope

Give a general overview of your anticipated implementation of the project. Address any areas where you are making upfront assumptions or curtailing potential detail. State the focus you will be taking in implementation.

Attributes

State and justify the attributes you'd like to receive upon successful approval and completion of this project.

  • attribute1: why you feel your pursuit of this project will gain you this attribute
  • attribute2: why you feel your pursuit of this project will gain you this attribute
  • etc…

Procedure

The actual steps taken to accomplish the project. Include images, code snippets, command-line excerpts; whatever is useful for intuitively communicating important information for accomplishing the project.

Code

Upon completion of the project, if there is an applicable collection of created code, place a copy of your finished code within <code> </code> blocks here.

ball.cpp

/* Paddle = Gimp, 10 width, 50 high, save as a bmp in project folrder pong  */ 
/* Ball = Gimp, 20 Width, 20 Height save as a bmp in project folrder pong */
 
/*http://www.youtube.com/watch?annotation_id=annotation_387415&feature=iv&src_vid=cf0vWJn9zZc&v=Mm7-me6mPuk*/
 
#include "ball.h"
 
ball::ball(SDL_Surface* img, int x, int y, int w, int h, int xVel, int yVel)
{
	image=img;
	box.x=x;
	box.y=y;
	box.w=w;
	box.h=h;
	xvel=xVel;
	yvel=yVel;
}
 
ball::~ball()
{
	SDL_FreeSurface(image);
}
 
void ball::show()
{
	SDL_BlitSurface(image,NULL,SDL_GetVideoSurface(),&box);
}
 
void ball::move(SDL_Rect* player1,SDL_Rect* player2)
{
	box.x+=xvel;
	box.y+=yvel;
	if(box.y<=0)
		yvel=-yvel;
	if(box.y+box.h>=SDL_GetVideoSurface()->clip_rect.h)
		yvel=-yvel;
 
	if(collision(&box,player1))
	{
 
		//top of paddle collision
		if(box.x+3<player1->x+player1->w)
		  yvel=-yvel;
		else
		  xvel=-xvel;
	}
 
	if(collision(&box,player2))
	{
 
		if(box.x+box.w-3>player2->w)
		  yvel=-yvel;
		else
		  xvel=-xvel;
 
	}
 
}
 
bool ball::collision(SDL_Rect* rec1,SDL_Rect* rec2)
{
	if(rec1->y >= rec2->y + rec2->h)
		return 0;
	if(rec1->x >= rec2->x + rec2->w)
		return 0;
	if(rec1->y + rec2->h <= rec2->y)
		return 0;
	if(rec1->x + rec1->w <= rec2->x)
		return 0;
	return 1;
}
 
int ball::isOut() 
{
	if(box.x<=0)
		return 1;
	if(box.x=SDL_GetVideoSurface()->clip_rect.w)
		return 2;
	return 0;
}
 
 
void ball::setBack(int x,int y, int w, int h, int xVel, int yVel) 
{
	box.x=x;
	box.y=y;
	box.w=w;
	box.h=h;
	xvel=xVel;
	yvel=yVel;
}

paddle.cpp

#include "paddle.h"
 
paddle::paddle(SDL_Surface* img, int x, int y, int w,int h, int yVel)
{
	box.x=x;
	box.y=y;
	box.w=w;
	box.h=h;
	image=img;
	yvel=yVel;
	point=0;
}
 
paddle::~paddle()
{
	SDL_FreeSurface(image);
}
 
void paddle::moveUp()
{
 
	 if(box.y>0)
	 box.y-=yvel;
 
}
 
void paddle::moveDown()
{
	if(box.y+box.h<SDL_GetVideoSurface()->clip_rect.h)
	  box.y+=yvel;
}
 
void paddle::show()
{
	SDL_BlitSurface(image,NULL, SDL_GetVideoSurface(), &box);
}
 
SDL_Rect* paddle::getRect()
{
	return &box;
}
 
void paddle::incpoint()
{
	point++;
}
 
void paddle::setBack(int x,int y,int w,int h,int yVel){
 
	box.x=x;
        box.y=y;
        box.w=w;
        box.h=h;
        yvel=yVel;
}
 
int paddle::getPoints()
{
	return point;
}

main.cpp

#include <SDL/SDL.h>
#include <iostream>
#include <SDL/SDL_ttf.h>
#include "ball.h"
#include "paddle.h"
 
SDL_Surface* load_image(const char* c,Uint32 colorkey=0)
{
	SDL_Surface* tmp=SDL_LoadBMP(c);
	if(colorkey!=0)
	{
 
		SDL_SetColorKey(tmp, SDL_SRCCOLORKEY,colorkey);
 
	}
	return tmp;
}
 
int main()
{
	SDL_Surface* screen;
	const int width=640;
	const int height=480;
	const int FPS=30;
 
	screen = SDL_SetVideoMode(width,height,32,SDL_SWSURFACE);
	TTF_Font* font;
	TTF_Init();
	font = TTF_OpenFont("lazy.ttf",20);
	SDL_Color color ={0,0,0};
	SDL_Event event;
	Uint32 start;
	bool running=true;
	bool arr[4] = {0,0,0,0};
	paddle player1(load_image("paddle.bmp"),0,225,10,50,4);
	paddle player2(load_image("paddle.bmp"),width-10,225,10,50,4);
	ball ball1(load_image("ball.bmp", SDL_MapRGB(screen->format,0x00,0xff,0xff)),320,240,20,20,3,5);
	SDL_Surface* text;
 
	while(running)
	{
		start=SDL_GetTicks();
		//handle events
 
		while(SDL_PollEvent(&event)){
 
		switch(event.type)
		{
			case SDL_QUIT:
			   running=false;
			   break;
 
			   case SDL_KEYDOWN:
			   switch(event.key.keysym.sym)
			{
				case SDLK_UP:
				  arr[0]=1;
				  break;
				case SDLK_DOWN:
				  arr[1]=1;
				  break;
				case SDLK_w:
				  arr[2]=1;
				  break;
				case SDLK_s:
				  arr[3]=1;
				  break;
			}
			break;
 
			case SDL_KEYUP:
			   switch(event.key.keysym.sym)
			{
				case SDLK_UP:
				  arr[0]=0;
				  break;
				case SDLK_DOWN:
				  arr[1]=0;
				  break;
				case SDLK_w:
				  arr[2]=0;
				  break;
				case SDLK_s:
				  arr[3]=0;
				  break;
			}
			break;
			}
		}
 
		//logic
		if(arr[0])
			player2.moveUp();
		else if(arr[1])
			player2.moveDown();
		if (arr[2])
			player1.moveUp();
		else if (arr[3])
			player1.moveDown();
		ball1.move(player1.getRect(),player2.getRect());
 
		//scoring by out of screen
		switch(ball1.isOut()){
 
			case 1:
			   player2.incpoint();
			   player1.setBack(0,255,10,50,3);
			   player2.setBack(width-10,225,10,50,3);
			   ball1.setBack(320,240,20,20,3,3);
			   break;
			case 2:
			   player1.incpoint();
			   player1.setBack(0,255,10,50,3);
                           player2.setBack(width-10,225,10,50,3);
                           ball1.setBack(320,240,20,20,3,3);
			   break;
		}
 
		//render
		SDL_FillRect(screen,&screen->clip_rect,SDL_MapRGB(screen->format,0xff,0xff,0xff));
		player1.show();
		player2.show();
		ball1.show();
 
		//text box for score
		char c[5];
		SDL_Rect tmp = {10,0};
		sprintf(c,"%d", player1.getPoints());
		c[4]='\0';
		text = TTF_RenderText_Solid(font,c,color);
		SDL_BlitSurface(text,NULL, screen,&tmp);
		SDL_FreeSurface(text);
 
		tmp.x=width-40;
		sprintf(c,"%d", player2.getPoints());
                text = TTF_RenderText_Solid(font,c,color);
		SDL_BlitSurface(text,NULL,screen,&tmp);
		SDL_FreeSurface(text);
 
		SDL_Flip(screen);
		//regulate FPS
		if(1000/FPS>(SDL_GetTicks()-start))
			SDL_Delay(1000/FPS-(SDL_GetTicks()-start));
		}
 
		TTF_CloseFont(font);
 
		TTF_Quit();
		SDL_Quit();
	}

ball.h

#include <SDL/SDL.h>
#ifndef BALL_H
#define BALL_H
 
	class ball{
 
		int xvel,yvel;
		SDL_Surface* image;
		SDL_Rect box;
		bool collision(SDL_Rect* rec1,SDL_Rect* rec2);
 
	public:
		ball(SDL_Surface* img, int x, int y, int w, int h, int xVel, int yVel);
		~ball();
		void show();
		void move(SDL_Rect* player1,SDL_Rect* player2);
		//ball out of screen
		int isOut();
		void setBack(int x,int y, int w, int h, int xVel, int yVel);
	};
 
 
#endif

paddle.h

#include <SDL/SDL.h>
#ifndef PADDLE_H
#define PADDLE_H
 
	class paddle{
		SDL_Rect box;
		SDL_Surface* image;
		int yvel;
		int point;
	public:
		paddle(SDL_Surface* img, int x, int y, int w, int h, int yVel);
 
	~paddle();
 
	SDL_Rect* getRect();
 
 
	void moveUp();
	void moveDown();
	void show();
		void incpoint();
        	void setBack(int x,int y,int w,int h,int yVel);
       		 int getPoints();
	};
#endif

Execution

Again, if there is associated code with the project, and you haven't already indicated how to run it, provide a sample run of your code: 

lab46:~/src/cprog$ ./hello
Hello, World!
lab46:~/src/cprog$

Compilation

compile in the same directory that contains ball.h, paddle.h, ball.bmp, paddle.bmp, and lazy.ttf 

PATH: g++ -o pong main.cpp ball.cpp paddle.cpp -lSDL -lSDL_ttf

Execution

PATH: ./pong

Reflection

Comments/thoughts generated through performing the project, observations made, analysis rendered, conclusions wrought. What did you learn from doing this project?

References

In performing this project, the following resources were referenced:

Generally, state where you got informative and useful information to help you accomplish this project when you originally worked on it (from Google, other wiki documents on the Lab46 wiki, etc.)

guide

This allowed me to learn code at a brisk pace for me to learn as much as possible in a short time span.

user/ahughe12/portfolio/sysprogproject1.txt · Last modified: 2013/05/06 23:25 by ahughe12