Arduino Starfield

novembro 27, 2012

 
 


1. Overview

Starfield is a simple arcade videogame for arduino and TV-Out library. The goal is to avoid the asteroids as long as you can. Each time one asteroid hits your rocket, you will lose energy (E). If you manage to survive for more than a minute you will go to another level.
The connection between arduino and the TV requires only a few components (resistores) since TV OUT library does most of the hard job by software.

To install and learn more about how this awsome library works, please follow the link:
http://code.google.com/p/arduino-tvout/downloads/list

There is an Arduino-based video game system, Hackvision. from nootropicdesign
Although I was not able to try this project on hackvision (I dont have any unit with me), I wrote the code to be fully compatible with it ( please, let me know and tell me how it went in case you did it).
Thanks to Michael for testing the game and add it to hackvision games page 🙂

Here is a short preview from the game running on my old green phosphor monitor. I shot it with my cellphone, so image quality is not very high.

 
 

2. Materials

1xArduino board
Resistors: 1×330,1x1k,1×470
2xRCA cable, one for video and the other for the audio.
4xpush Buttons
1xBreadboard
Jump wires

 
 

3. The Circuit

If you cant find RCA female plugs, then simple grab an two old audio RCA cable and cut them.
The game will run even if you dont have the audio connected (nor the buttons).

 
 

The lastpicture shows the project deployed on a breadboard. Note that in this version the audio connections are not installed.

 
 

4. Code for Arduino

– Download the project files and program your arduino. Remember, if your TV system is NTSC you should comment the PAL statement and uncomment NTSC line in first section of the program.
Project Files

The game code is available below for a sneak preview

/*
Mário Vairinhos 2012
This software is free. You may distribute, copy or modify
as long as you give me credits.
*/

#include <TVout.h>
#include <fontALL.h>
#include "rocket.h"
TVout TV;

#define TVSYSTEM        _PAL
//#define TVSYSTEM        _NTSC
#define SCREENWIDTH     128
#define SCREENHEIGHT    96
#define SCREENWIDTH2    64
#define SCREENHEIGHT2   48
#define ASTEROIDS       18

// pin controls
#define BT_UP           4
#define BT_DOWN         5
#define BT_LEFT         3
#define BT_RIGHT        2

#define BEEP      TV.tone(1046,200);

// globals
int asteroidsX[ASTEROIDS];
int asteroidsY[ASTEROIDS];
int asteroidsZ[ASTEROIDS];
float meX, meY,meZ=0;
float screenX,screenY;
float myspeed;
int level;
int energy;
int tick;
int seconds;
int frames;
byte gameState=0; //(0-startLevel,1-run,2-gameOver,3 win)



void setup()
{

  //init TV library
  TV.begin(TVSYSTEM, SCREENWIDTH, SCREENHEIGHT);
  TV.select_font(font4x6);
  TV.delay_frame(60);
  TV.clear_screen();
  
  // setup pullup resistors
  pinMode(BT_UP   ,INPUT);digitalWrite(BT_UP   ,HIGH);
  pinMode(BT_DOWN ,INPUT);digitalWrite(BT_DOWN ,HIGH);
  pinMode(BT_LEFT ,INPUT);digitalWrite(BT_LEFT ,HIGH);
  pinMode(BT_RIGHT,INPUT);digitalWrite(BT_RIGHT,HIGH);

  level=0;
  gameState=0;
}


// game's state
void loop()
{
 switch (gameState){
  case 0:
    startLevel();
    break;
  case 1:
    run();
    break;
  case 2:
    run();
    break;
  case 3:
    win();
    break;    
    
 } 
}

// static vars
byte startLev=0;
byte ry,rdy;

void startLevel(){
  // random asteroids once
  if (startLev==0){
    BEEP
    meX=100;meY=0;meZ=0;startLev=1;ry=20;rdy=1;
    for(int i=0;i<ASTEROIDS;i++){asteroidsX[i]=random(130,230);asteroidsY[i]=random(1,95);asteroidsZ[i]=random(1,5);} 
  }

  // render the screen
  // and move the rocket
  tempo();
  frames++;
  if (frames>2){
   TV.clear_screen();
   frames=0;
   ry+=rdy;
   if (ry>20) rdy=-1;
   if (ry<5) rdy=1;   
   TV.bitmap(25,ry,rocket,1,72,40);
   drawLevel();
  }


    // move the asteroids
    for(int i=0;i<ASTEROIDS;i++){
      asteroidsX[i]-=asteroidsZ[i];
      if(asteroidsX[i]<=1) asteroidsX[i]=130;
      if (asteroidsX[i]<128 && asteroidsX[i]>0) TV.set_pixel(asteroidsX[i],asteroidsY[i],1);
    } 
    
     // check user input
     if ((digitalRead(BT_LEFT) ==LOW) &&  (digitalRead(BT_RIGHT) ==LOW)){
       initLevel();
       gameState=1;
       startLev=0;
       clicka();
     }
   // after 60 seconds on inactivity, start the level anyway
   if (seconds>60) initLevel();
   
   TV.delay_frame(1);
}

void clicka(){
  BEEP
  TV.delay(200);
  TV.invert();
  TV.delay(200);
  TV.clear_screen();
}


void win(){
  level++;
  gameState=0;
  startLev=0;
}

void run()
{

  tempo();
  
  // every 3 frames clear te screen 
  // and render the cockpit
  // every frame render the asteroids
  frames++;
  if (frames>3){
   frames=0;
   TV.clear_screen();
   drawCockpit();
   if (gameState==2){
     drawGameOver();
     if (seconds>10){
       gameState=0;
       level=1;
     }
   }
  }
  
  // user input
  if (digitalRead(BT_LEFT) ==LOW){meX-=1+level/3;}
  if (digitalRead(BT_RIGHT)==LOW){meX+=1+level/3;}
  if (digitalRead(BT_UP) ==LOW){meY-=1+level/3;}
  if (digitalRead(BT_DOWN)==LOW){meY+=1+level/3;}
  
  // collision
    for(int i=0;i<ASTEROIDS;i++){
      if (asteroidsZ[i]<20){
        if (abs(asteroidsX[i]-meX)+abs(asteroidsY[i]-meY)<=25){
          if (gameState==1){
            beepCrash();
            TV.fill(2);
            energy--;
          }
        }
        respawn(i,meX,meY,800,i*20+5,0);
      }
      asteroidsZ[i]-=myspeed;
    }
    renderAsteroids();
    
 if (energy<=0){
   gameState=2;
   energy=1;
   seconds=0;
 }

 
 if (seconds>100){
   win();
 }
}


void initLevel(){
  TV.noTone();
  myspeed=10+level*2; //3
  energy=5;
  tick=0;
  seconds=0;
  meX=0;
  meY=0;
  meZ=0;
  for(int i=0;i<ASTEROIDS;i++){
    respawn(i,meX,meY,1000,120,600); 
  }
  gameState=1; 
  startLev=0;
}


void respawn(int index,int ox, int oy,int oz,int radius,int radiusZ){
  asteroidsX[index]=ox+random(-radius,+radius);
  asteroidsY[index]=oy+random(-radius,+radius);
  asteroidsZ[index]=oz+random(radiusZ);
}
void get2dFrom3d(float coordX,float coordY,float coordZ){
  coordX=coordX-meX;
  coordY=coordY-meY;
  coordZ=coordZ-meZ;
  if (coordZ==0) coordZ=0.1;
    screenX=(float(coordX)/float(coordZ))*SCREENWIDTH;
    screenY=(float(coordY)/float(coordZ))*SCREENHEIGHT;
}

void renderAsteroids(){
   float x1,radius;
   int vx,vy;
   for(int i=0;i<ASTEROIDS;i++){
    get2dFrom3d(asteroidsX[i],asteroidsY[i],asteroidsZ[i]);
    radius=2200/(asteroidsZ[i]<<2);
    vx=SCREENWIDTH2+screenX;
    vy=SCREENHEIGHT2+ screenY;
    if (vx<(SCREENWIDTH-radius-1) && vx>(radius+1) && vy<(SCREENHEIGHT-radius-1) && vy>(radius+1)){
        TV.draw_circle(vx,vy,radius,1,1);
    }
  }
  TV.delay_frame(1);
}

void tempo(){
  tick++;
  if (tick>30){
    tick=0;
    seconds++;
  }
}



void drawCockpit(){
   TV.select_font(font4x6);
   byte x=43;byte y=71;
   TV.print_char(x,y,'E');
   TV.draw_rect (x+6,y+1,energy*2  ,4  ,1,1);
   TV.draw_rect (x+5,y+0,12 ,5  ,1);
   x=65;y=71;
   TV.print_char(x,y,'T');
   TV.draw_rect (x+6,y+1 ,seconds/10  ,4  ,1,1);
   TV.draw_rect (x+5,y   ,12 ,5  ,1);
   
   TV.draw_line(20,SCREENHEIGHT,40,SCREENHEIGHT-16,1);
   TV.draw_line(SCREENWIDTH-20,SCREENHEIGHT,SCREENWIDTH-40,SCREENHEIGHT-16,1);
   TV.draw_rect(40,SCREENHEIGHT-16-12,SCREENWIDTH-40-40,12,1);
   TV.draw_line(0,SCREENHEIGHT-16-12-30,40,SCREENHEIGHT-16-12,1);
   TV.draw_line(SCREENWIDTH,SCREENHEIGHT-16-12-30,SCREENWIDTH-40,SCREENHEIGHT-16-12,1);   

    TV.print_char(55,84,'L');
    TV.print_char(60,84,'E');
    TV.print_char(65,84,'V');
    TV.print_char(72,84,level+48);

}

void drawLevel(){
  byte x,y;
  x=30;y=50;
  TV.select_font(font8x8);
  TV.print(x+15,y,"LEVEL");
  TV.print(byte(level+48));
  TV.select_font(font4x6);
  TV.print(x,y+10,"press LEFT & RIGHT");
}


void drawGameOver(){
  TV.select_font(font8x8);
  TV.print(30,30,"GAME OVER");
  TV.delay_frame(1);
}



void beepCrash(){
 TV.tone(random(60,100),150);
}
}

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