galcon hacking

galcon_hacking.html

<style>*{margin:0;padding:0;box-sizing:border-box;}canvas{width:100%;height:100%}</style>
<canvas id='C' style='background:#000;'>
<script>
var c=C.getContext("2d"),R=Math.random,tick=Date.now(),selectedPlanets=new Set(),i,j,ships=[],planets=[],sfx=[];
C.width = window.innerWidth; C.height = window.innerHeight;
c.font = '18px Helvetica'; c.textAlign = 'center'; c.textBaseline = 'middle';

function synth(f,d){
  for(var t=0,s='RIFF_oO_WAVEfmt '+atob('EAAAAAEAAQBAHwAAQB8AAAEACAA')+'data';++t<d;)s+=String.fromCharCode(f(t));
  return new Audio('data:audio/wav;base64,'+btoa(s));
}
function s_gameOver(t){return (Math.sin(t/(t>>9))*10)&255}

function dist(x1,y1,x2,y2){return Math.sqrt(Math.pow(x1-x2,2)+Math.pow(y1-y2,2))}
function inPlanet(x,y,p){return dist(p.x,p.y,x,y)<p.r}

function generatePlanets(n){
  var i, s = [30,60,90,120], m = s.slice(-1)[0];
  function randPlanet(){
    var x = R()*(C.width-m*2)+m, y = R()*(C.height-m*2)+m, p = x<C.width*0.5 && y<C.height*0.5 ? 1 : x>C.width*0.5 && y>C.height*0.5 ? 2 : 0;
    return {x: x, y: y, r: s[Math.floor(R()*s.length)], e: 10, p: p}
  }
  function isGoodPlanet(q,p){for(i=0;i<p.length;i++){if(dist(q.x,q.y,p[i].x,p[i].y)<((q.r+p[i].r)*1.5)){return false}}return true}
  function newPlanet(p,q){while(!isGoodPlanet(q=randPlanet(),p)){q=randPlanet()}return q}
  var p=[];for(i=0;i<n;i++){p.push(newPlanet(p))};return p;
}

function sendShips(p,q){
  for(var i=0,n=Math.floor(p.e*0.5);i<Math.min(n,p.e);i++){ /*create ships based on planets energy*/
    ships.push({from: p, to: q, p: p.p, x: p.x+R()*p.r-p.r/2, y: p.y+R()*p.r-p.r/2, rdx: R()*0.8-0.4, rdy: R()*0.8-0.4}); /*create ship*/
    p.e--; /*take energy from planet*/
  }
}

function shipCollision(s){
  if(s.from==s.to)return s.to;
  for(var i=0;i<planets.length;i++)if(planets[i]!=s.from&&(planets[i].p!=s.p||planets[i]==s.to)&&inPlanet(s.x,s.y,planets[i]))return planets[i];
  return null;
}

function gameLoop() {
  var tickAction = false, pc;
  if(Date.now()-tick>1000){ tick = Date.now(); tickAction = true; }
  c.clearRect(0, 0, C.width, C.height);
  /* handle planets */
  for(var i=0;i<planets.length;i++){
    c.beginPath();
    c.arc(planets[i].x, planets[i].y, planets[i].r, 0, 2 * Math.PI, false);
    c.fillStyle = planets[i].p == 0 ? '#999' : planets[i].p == 2 ? '#900' : '#090';
    c.fill();
    c.fillStyle = 'rgba(255,255,255,0.8)';
    c.fillText(planets[i].e, planets[i].x, planets[i].y);
    if(tickAction && planets[i].p != 0){
      if(planets[i].e < planets[i].r) planets[i].e=Math.floor(planets[i].e + planets[i].r/30); else planets[i].e--;
    }
  }
  /* winning condition */
  if(tickAction){
    if(!planets.find(function(p){return p.p==2}) && !ships.find(function(s){return s.p==2})){ alert("Green wins"); newGame() }
    else if(!planets.find(function(p){return p.p==1}) && !ships.find(function(s){return s.p==1})){ alert("Red wins"); newGame() }
  }
  /* handle ships */
  for(var i=0;i<ships.length;i++){
    var x1 = ships[i].x, y1 = ships[i].y, x2 = ships[i].to.x, y2 = ships[i].to.y, d = dist(x1,y1,x2,y2),
        dx = (x2-x1)/d, dy = (y2-y1)/d, a = Math.atan2(y2-y1,x2-x1);
    ships[i].x += dx*3+ships[i].rdx;
    ships[i].y += dy*3+ships[i].rdy;
    c.save();
    c.translate(ships[i].x,ships[i].y);
    c.rotate(a);
    c.fillStyle = ships[i].p == 2 ? '#d00' : '#0d0';
    c.beginPath();
    c.moveTo(0,0);
    c.lineTo(-16,-6);
    c.lineTo(-16, 6);
    c.closePath();
    c.fill();
    c.beginPath();
    for(var j=0;j<4;j++){c.strokeStyle='rgba(255,'+Math.floor(99+R()*99)+',0,'+R()+')'; c.moveTo(-16, 0); c.lineTo(R()*-10-25, R()*8-4);c.stroke();}
    c.restore();

    if(pc=shipCollision(ships[i])){
      if(pc.p==ships[i].p){
        pc.e++;
        sfx.push({x: pc.x, y: pc.y, r: pc.r, t: 1, f: 10});
      }else if(pc.p!=ships[i].p){
        pc.e--;
        if(pc.e==0) pc.p=0; else if(pc.e<0) pc.p=ships[i].p;
        sfx.push({x: ships[i].x, y: ships[i].y, t: 0, f: 10});
      }
      ships.splice(i, 1);
    }
  }
  /* handle sfx */
  for(var i=0;i<sfx.length;i++){
    if(sfx[i].t==0){ //explosion
      c.strokeStyle='rgba(255,'+Math.floor(99+R()*99)+',0,'+(R()*0.33+0.66)+')';
      c.lineWidth = 2;
      c.beginPath();
      c.moveTo(sfx[i].x+R()*20-10,sfx[i].y+R()*20-10);
      for(var j=0;j<3;j++)c.lineTo(sfx[i].x+R()*20-10,sfx[i].y+R()*20-10);
      c.closePath();
      c.stroke();
    }else if(sfx[i].t==1){ //planet energy boost
      c.strokeStyle='rgba(99,99,'+Math.floor(99+R()*99)+','+(R()*0.33+0.66)+')';
      c.lineWidth = 2;
      c.beginPath();
      c.arc(sfx[i].x, sfx[i].y, sfx[i].r+R()*5, 0, 2 * Math.PI, false);
      c.closePath();
      c.stroke();
    }
    if(--sfx[i].f<0)sfx.splice(i, 1);
  }
  if(tickAction){ aiMove(planets, 2) }
  requestAnimationFrame(gameLoop);
}

function planetOnPosition(pos, teams){
  for(var i=0;i<planets.length;i++)
    if(inPlanet(pos[0], pos[1], planets[i]) && teams.indexOf(planets[i].p)!==-1 )
      return planets[i];
  return null;
}

function pos(e){
  return [e.changedTouches ? e.changedTouches[0].pageX : e.pageX, e.changedTouches ? e.changedTouches[0].pageY : e.pageY];
}

function dragmove(e){
  e.preventDefault();
  var planet = planetOnPosition(pos(e), [1]);
  if(planet) selectedPlanets.add(planet);
}

function drop(e){
  var planet = planetOnPosition(pos(e), [0,1,2]);
  if(planet) for(p of selectedPlanets) sendShips(p, planet);
  selectedPlanets.clear();
}

function aiMove(planets, team){
  var neutralPlanets = [], myPlanets = [], enemyPlanets = [];
  planets.forEach(function(p){
    if(p.p == 0) neutralPlanets.push(p);
    else if(p.p == team) myPlanets.push(p);
    else if(p.p != team) enemyPlanets.push(p);
  });
  myPlanets.sort(function(a, b){ return b.e - a.e }); // strongest first
  enemyPlanets.sort(function(a, b){ return a.e - b.e }); // weakest first
  neutralPlanets.sort(function(a, b){ return a.e - b.e }); // weakest first
  if(myPlanets.length > 0 && enemyPlanets.length > 0 && myPlanets[0].e > 10) sendShips(myPlanets[0], enemyPlanets[0]);
  if(neutralPlanets.length > 0) for(p of myPlanets) if(p.e > 20) sendShips(p, neutralPlanets[0]);
}

function newGame(){ planets = generatePlanets(12); ships = []; }

C.addEventListener('touchstart', dragmove, false);
C.addEventListener('mousedown', dragmove, false);
C.addEventListener('touchmove', dragmove, false);
C.addEventListener('mousemove', dragmove, false);
C.addEventListener('touchend', drop, false);
C.addEventListener('mouseup', drop, false);

newGame();
gameLoop();
</script>