Number.parseInt=parseInt;(function(arr){arr.forEach(function(item){if(item.hasOwnProperty('remove')){return;}
Object.defineProperty(item,'remove',{configurable:true,enumerable:true,writable:true,value:function remove(){this.parentNode.removeChild(this);}});});})([Element.prototype,CharacterData.prototype,DocumentType.prototype]);function log(msg){if(DEBUG_MODE_ENABLED){var func=arguments.callee.caller.name;msg=msg||'';console.log(arguments.callee.caller.name+"() --> "+msg);}}
function getURLParameter(name){return decodeURIComponent((new RegExp('[?|&]'+name+'='+'([^&;]+?)(&|#|;|$)').exec(location.search)||[null,''])[1].replace(/\+/g,'%20'))||null;}
var util={get:function(id){return document.getElementById(id)},getClass:function(className){return document.getElementsByClassName(className);},html:function(id,val){var e=document.getElementById(id);if(val)return e.innerHTML=val;else return this.getElementById},size:function(id,val){var e=document.getElementById(id);if(val){e.style.width=val.x+'px';e.style.height=val.y+'px';}
else return{x:e.offsetWidth,y:e.offsetHeight}},randomArray:function(items){if(!items||!Array.isArray(items)){return null;}
return items[~~(items.length*Math.random())];},uniqueId:function(){return Math.random().toString(36).substring(2)
+(new Date()).getTime().toString(36);}}
const TANKS_VERSION="0.72";const DEBUG_MODE_ENABLED=false;var difficulty=1,ratio=1,startingMoney=100,winPayout=500,hitPayout=250,cheatsEnabled=false;soundEnabled=true;particle_WeatherEnabled=false,tankMax=4,tankPlayers=4,tankNo=0,showCompassQ=true,tanks=[],aiOnlyTurns=0,clrs=[["Blue",'#0066FF'],["Red",'#FF0000'],["Orange",'#ff7700'],["Purple",'#9155ff']],windForce=0,maxWindForce=.015,gravityForce=.03,ters=[['images/bg/basic.svg','#578641',[0.40,0.6,0.3,0.1,0.05,0.02,0.001,0.001,0],0.2,'Grassland','grass-texture',0.03],['images/bg/desert.svg','#bea276',[0.08,0.04,0.03,0.02,0.01,0.002,0.0001,0.0001,0],0.01,'Desert','desert-texture',0.03],['images/bg/snow.svg','#fafaff',[0.0,0.0,0.5,0.15,0.0,0.02,0.002,0.001,0],0.05,'Snow','snow-texture',0.03],['images/bg/forest.svg','rgb(50,150,16)',[0.4,0.6,0.3,0.1,0.05,0.02,0.001,0.001,0],0.06,'Forest','forest-texture',0.03],['images/bg/hills.svg','#359539',[0.4,0.6,0.3,0.1,0.05,0.02,0.001,0.001,0],0.06,'Hills','hills-texture',0.03],['images/bg/moon.svg','#888',[0.40,0.6,0.03,0.1,0.05,0.02,0.001,0.001,0],.3,'Moon','moon-texture',0.011],['images/bg/city.svg','#578641',[.2,0,0,0,0,0,0,0,0],.3,'City','grass-texture',0.03],['images/bg/city-night2.svg','#888',[.2,0,0,0,0,0,0,0,0],.5,'City-Night','moon-texture',0.03],['images/bg/beach.svg','#bea276',[.2,.2,.2,0,0,0,0,0,0],.01,'Beach','desert-texture',0.03]],terPts=[],terMax=9,terNo=0,terBottomOffset=18,terTopOffset=75;var costMap={'Fuel':50,'Health':75,'Shield':150,'Targeting':200,'Medium Shell':50,'Large Shell':200,'Cannon Ball':300,'EMP':500,'Atomic Shell':750,'Air Strike':1000,'Napalm':1000,'Sniper Shell':500,'Flak Cannon':500}
var tanksTimesClicked=0;var newRound=false;var titleMute=true;var timeouts=[];var demoModeEnabled=false;var skipAiRound=false;var resolution={x:Number(getURLParameter('width'))||window.innerWidth||document.documentElement.clientWidth||document.body.clientWidth,y:Number(getURLParameter('height'))||window.innerHeight||document.documentElement.clientHeight||document.body.clientHeight}
if(resolution.y>resolution.x){var tmp=resolution.x;resolution.x=resolution.y;resolution.y=tmp;}
if(resolution.x<800){resolution.x*=1.25;resolution.y*=1.25;}
function tanksMain(){log('<==== tanksMain ====>')
window.addEventListener('load',function(){document.getElementById('load-screen').onclick=function(){this.style.display='none';document.getElementById('game').style.display='block';}
var text=document.getElementById('load-screen').children[0];text.innerHTML="OK!";text.style.background="white";text.style.transform="rotate(-3deg);"
window.oncontextmenu=function(event){log("prevent context menu");event.preventDefault();event.stopPropagation();return false;};});window.addEventListener('resize',screenResized);if(!soundEnabled)document.getElementById('mute-control-checkbox').checked=true;if(cheatsEnabled)document.getElementById('cheats').style.display="block";setVersion(TANKS_VERSION);initRendering();setTerrain(0);updateParticles();showHud(false);showMainMenu(true);bindButtonHandlers();popPlayerSelect(tankPlayers);setBackground(ters[0][0]);drawGrid();toggleGrid();demoMode();}
function toggleFullScreen(){var doc=window.document;var docEl=doc.documentElement;var requestFullScreen=docEl.requestFullscreen||docEl.mozRequestFullScreen||docEl.webkitRequestFullScreen||docEl.msRequestFullscreen;var cancelFullScreen=doc.exitFullscreen||doc.mozCancelFullScreen||doc.webkitExitFullscreen||doc.msExitFullscreen;if(!doc.fullscreenElement&&!doc.mozFullScreenElement&&!doc.webkitFullscreenElement&&!doc.msFullscreenElement){requestFullScreen.call(docEl);}
else{cancelFullScreen.call(doc);}
screenResized();}
function screenResized(){log();var scale={x:document.body.offsetWidth/resolution.x,y:document.body.offsetHeight/resolution.y}
ratio=Math.min(scale.x,scale.y)
var dim={x:(resolution.x*ratio),y:(resolution.y*ratio)}
util.size('game',dim);var cans=document.getElementsByTagName('canvas');var x=cans.length;for(var i=0;i<x;i++){resizeCanvas(cans[i]);}
drawTerrain();drawTanks();drawGrid();}
function startGame(){demoModeEnabled=false;clearParticleCanvas();hideTitle();initPlayers();createTanks();newGame();}
function playerCountChange(){var e=document.getElementById('player-count-box');var n=Number.parseInt(e.options[e.selectedIndex].innerHTML);popPlayerSelect(n);}
function demoMode(){var n=2;demoModeEnabled=true;initPlayers();createTanks(n);newGame();setTerrain(2);drawTanks();for(var i in tanks)tanks[i].aiq=true;aistt();showMainMenu();}
function initPlayers(){var pSel=document.getElementById('player-count-box');tankPlayers=Number.parseInt(pSel.options[pSel.selectedIndex].innerHTML);var scores=document.getElementsByClassName('player-score');for(var i=0;i<scores.length;i++){if(i<tankPlayers)scores[i].style.display='inline';else scores[i].style.display='none';}}
function payTank(tank,amt){log(tank.name+" has earned $"+amt);tank.money+=amt;flashMessage('$'+amt,1000,'lime');}
function giveAllWeapons(tank){log('CHEATER!!!..');flashMessage("Weapon Cheat!");for(var i=1;i<tank.weapons.length;i++){tank.weapons[i].ammo=100;}
updateHud();}
function animate(totalTime,func,callback){log("Start animating: "+arguments.callee.caller.name);var lastFrame=0;var elapsed=0;var progress=0;var dt=0;var loop=function(timestamp){if(lastFrame==0)lastFrame=timestamp;dt=timestamp-lastFrame;elapsed+=dt;lastFrame=timestamp;progress=elapsed/totalTime;if(elapsed<totalTime){func(progress);requestAnimationFrame(loop);}
else{if(callback)callback();}}
loop(0);}
function changeWeapon(){var selected=document.getElementById('player-weapon').selectedIndex;var tank=tanks[tankNo];tank.currentWeapon=selected;log('Change weapon:'+tank.weapons[selected].name);}
function flashMessage(msg,fadeOut,color,callback){fadeOut=fadeOut||1500;var msgDiv=document.getElementById('flash-message');msgDiv.innerHTML=msg;msgDiv.style.opacity=1;msgDiv.style.paddingBottom="0px";msgDiv.style.color=color||'white';animate(fadeOut,function(progress){msgDiv.style.opacity=1-progress;msgDiv.style.paddingBottom=(progress*150)+'px';},function(){msgDiv.style.opacity=0;if(callback)callback();});}
function popPlayerSelect(n){var elem=document.getElementById('player-selection');elem.innerHTML=s="";for(var i=0;i<n;i++){s+='<li class="player-select-box" style="background-color: '+clrs[i][1]+'; ">';var selected=i==0?0:1;s+=getDropdownHTML(['Human','Computer'],'funcy','playerType'+i,selected);s+='</li>';}
elem.innerHTML=s;log("Player selection panels created.");}
function buy(name){log("Buy: "+name);var tank=tanks[tankNo];var cost=costMap[name];if(tank.money<cost){log("Not enough money");flashMessage("Not Enough Money!",1000,'red');return;}
switch(name){case 'Health':if(tank.health<100)tank.health+=25;else{flashMessage("Health Already Max!",1000,'red');return;}
tank.health=Math.min(tank.health,100);break;case 'Fuel':tank.fuel+=25;break;case 'Shield':tank.shields+=1;break;case 'Targeting':tank.targeting+=1;break;case 'Medium Shell':tank.weapons[1].ammo+=1;break;case 'Large Shell':tank.weapons[2].ammo+=1;break;case 'Atomic Shell':tank.weapons[3].ammo+=1;break;case 'Cannon Ball':tank.weapons[4].ammo+=1;break;case 'Air Strike':tank.weapons[5].ammo+=1;break;case 'EMP':tank.weapons[6].ammo+=1;break;case 'Napalm':tank.weapons[7].ammo+=1;break;case 'Sniper Shell':tank.weapons[8].ammo+=1;break;case 'Flak Cannon':tank.weapons[9].ammo+=1;break;};playSound('cash');flashMessage(name,1500,tank.clr);tank.money-=cost;updateStoreCounts();tank.draw();updateHud();}
function updateHud(){var name=document.getElementById('player-name');var health=document.getElementById('player-health');var position=document.getElementById('player-position');var angle=document.getElementById('player-angle');var force=document.getElementById('player-force');var gas=document.getElementById('player-gas');var money=document.getElementById('player-money');var blueScore=document.getElementById('blue-score');var redScore=document.getElementById('red-score');var orangeScore=document.getElementById('orange-score');var purpleScore=document.getElementById('purple-score');var weapon=document.getElementById('player-weapon');var tank=tanks[tankNo];name.innerHTML=tank.name;name.style.color=tank.clr;health.innerHTML=tank.health;position.innerHTML=Math.ceil(tank.x);angle.innerHTML=(tank.dangle>90?180-tank.dangle:tank.dangle)+'°';force.innerHTML=tank.force;gas.innerHTML=tank.fuel;money.innerHTML=tank.money;blueScore.innerHTML=tanks[0].kills;redScore.innerHTML=tanks[1].kills;orangeScore.innerHTML=tanks[2].kills;purpleScore.innerHTML=tanks[3].kills;for(i=0;i<weapon.options.length;i++){weapon.options[i].disabled=tank.weapons[i].ammo==0;}
weapon.selectedIndex=tank.weapons[tank.currentWeapon].ammo!=0?tank.currentWeapon:0;changeWeapon();var infoPanel=document.getElementById('grid-info-panel');var f=tanks[tankNo].force;var a=tanks[tankNo].dangle;var angle=a*(Math.PI/180);var pX=tanks[tankNo].barrelX;var pY=resolution.y-tanks[tankNo].barrelY;var vX=(Math.cos(angle)*f/5)*3;var vY=(Math.sin(angle)*f/5)*2;var s="<p>Assume that all bullets have a mass of 1</p>";s+="<p>Bullet initial velocity: <br>(<b>"+vX.toFixed(1)+"</b> , <b>"+vY.toFixed(1)+"</b>)</p>";s+="<p>Gravity acceleration: <br><b>"+gravityForce+"</b></p>";s+="<p>Your position: <br>(<b>"+pX.toFixed(1)+"</b> , <b>"+pY.toFixed(1)+"</b>)</p>";s+="<p>Bullet position after 1 second: <br>(<b>"+(pX+vX).toFixed(1)+"</b> , <b>"+(pY+vY-gravityForce).toFixed(1)+"</b>)</p>";s+="<button class='togglebtn' style='float:right;font-family:gameFont;' onclick='payToPlot();'>Plot It!<br>$50</button>"
infoPanel.innerHTML=s;}
function payToPlot(){if(tanks[tankNo].money<50){flashMessage('Not Enough Money',2000,'red');return;}
else{flashMessage("GRAPHING ACTION!",2500,'orange');}
tanks[tankNo].money-=50;updateHud();drawGrid();var points=[];var tank=tanks[tankNo];var a=tank.dangle*(Math.PI/180);var g=document.getElementById('grid-canvas').getContext('2d');var m=.5,n=500,int=5;var p={x:tank.barrelX,y:tank.barrelY},v={x:Math.cos(a)*tank.force/5,y:Math.sin(a)*tank.force/5}
console.log(p,v);for(var i=0;i<n;i++){console.log("looping");v.y-=gravityForce*m;p.x+=m*v.x*3;p.y-=m*v.y*2;var ht=terPts[Math.round(p.x)]-p.y;if(ht>0){points.push([p.x,p.y]);}else break;}
console.log(points);drawParabola(g,tank.clr,points,int);}
function createTanks(){for(var i in tanks){tanks[i].cleanupAndRemove();tanks[i]=null;}
tanks=[];for(var i=0;i<tankMax;i++){var tank=new Tank(i);tank.name=clrs[i][0];tank.clr=clrs[i][1];tank.aiq=false;tanks.push(tank);}
log(tankMax+" tanks created");}
function playSound(name){var muted=titleMute||document.getElementById('mute-control-checkbox').checked;if(!muted){log('play sound '+name);var element=document.getElementById('sfx-'+name);if(element)element.play();else log("sound '"+name+"' does not exist");}}
function setVersion(str){log("Version="+str);var els=document.getElementsByClassName("version-number");for(var i in els){els[i].innerHTML=str;}}
function initRendering(){var tCanvas=createCanvas('terrain-canvas');var pCanvas=createCanvas('particle-canvas');var gCanvas=createCanvas('grid-canvas');screenResized();}
function bindButtonHandlers(){var interval;var default_dt=170;var btnHandlers=[{id:'move-left-button',dt:150,action:function(){move(-1);updateHud();}},{id:'move-right-button',dt:150,action:function(){move(1);updateHud();}},{id:'force-down-button',action:function(){forceDown();updateHud();}},{id:'force-up-button',action:function(){forceUp();updateHud();}},{id:'angle-down-button',action:function(){angleDecrement(1);updateHud();}},{id:'angle-up-button',action:function(){angleIncrement(1);updateHud();}},{id:'angle-down-big-button',action:function(){angleDecrement(5);updateHud();}},{id:'angle-up-big-button',action:function(){angleIncrement(5);updateHud();}}];function stopIt(){window.clearInterval(interval);interval=null;}
function bindHandler(id,action,dt){var btn=document.getElementById(id);if(!btn)log("could not bind handler: "+id);btn.onmousedown=function(){action();window.clearInterval(interval);interval=window.setInterval(action,dt?dt:default_dt);}
btn.ontouchstart=function(){window.clearInterval(interval);interval=window.setInterval(action,dt?dt:default_dt);};btn.onmouseup=stopIt;btn.onmouseout=stopIt;btn.ontouchleave=stopIt;}
for(var i in btnHandlers){var h=btnHandlers[i];bindHandler(h.id,h.action,h.dt);}
document.body.onclick=stopIt;document.body.ontouchend=stopIt;document.body.ontouchleave=stopIt;document.body.onmouseup=stopIt;document.body.onmouseleave=stopIt;document.body.onkeydown=key;}
function aistt(){showHud(false);var t=tanks[tankNo];if(t.aiq){aishop();aiequip();t.aiDirn=(Math.random()>t.x/resolution.x)?1:-1;aimove();}}
function aimove(){var t=tanks[tankNo];if(!t.aiq)return;if(t.fuel>0){move(t.aiDirn);}
else{log("ai tank out of fuel");}
if(Math.random()>0.25){timeouts.push(setTimeout(aimove,200));}else{timeouts.push(setTimeout(aiplay,200));}}
function aiequip(){var t=tanks[tankNo];if(!t.aiq)return;for(var i=t.weapons.length-1;i>-1;i--){if(t.weapons[i].ammo>0){t.currentWeapon=i;log("AI tank equips "+t.weapons[i].name);return;}}
t.currentWeapon=0;}
function aishop(){var t=tanks[tankNo];if(!t.aiq)return;var chanceToBuy;if(difficulty==0)chanceToBuy=.1;else if(difficulty==1)chanceToBuy=.3;else if(difficulty==2)chanceToBuy=.6;else if(difficulty>=3)chanceToBuy=.8;if(Math.random()>chanceToBuy)return;function tryBuy(n){if(t.money>=costMap[n]){buy(n);}}
var buyRounds=0;while((buyRounds<difficulty)&&(t.money>Math.max(Math.min(1000,Math.random()*t.money)),t.money/2)){buyRounds++;if(t.health<50){tryBuy('Health');}
if(t.fuel==0){tryBuy('Fuel');}
if(Math.random()>.5&&t.shields<3){tryBuy('Shield')}
tryBuy('Napalm');tryBuy('EMP');tryBuy('Atomic Shell');tryBuy('Cannon Ball');tryBuy('Large Shell');tryBuy('Medium Shell');tryBuy('Sniper Shell');tryBuy('Targeting');}}
function aiplay(){var t=tanks[tankNo];if(!t.aiq)return;var tries=10-(2-difficulty);var triesData=[];var dmax=1e11;var tanksLeft=0,tanksRight=0;for(var i=0;i<tankPlayers;i++){if(tanks[i].health>0){if(tanks[i].x<t.x)tanksLeft++;else if(tanks[i].x>t.x)tanksRight++;}}
if(t.dangle>90&&tanksLeft==0)t.dangle=45;else if(t.dangle<90&&tanksRight==0)t.dangle=135;for(var i=0;i<tries;i++){var f=t.force;var a=t.dangle;if(i>0){f+=getRandomInt(-5,5);a+=getRandomInt(-25,25);}
var d=t.aifire(f,a);triesData.push([d,f,a]);}
triesData.sort(function(a,b){if(a[0]<b[0])return-1;if(a[0]>b[0])return 1;return 0;});var chosenTry=triesData[Math.max(0,2-difficulty)];if(typeof t.lastShotDistance=="undefined"){t.lastShotDistance=1e11;}
log(triesData);if(t.lastShotDistance>chosenTry[0]||t.lastShotOutOfBounds){log('New shot setup: '+chosenTry);t.lastShotDistance=chosenTry[0];t.force=chosenTry[1];t.dangle=chosenTry[2];t.draw();}
else{log("Using last shot setup");}
t.fire();}
function shakeScreen(){var shakeTime=.82;var gameEl=document.getElementById('game');gameEl.style.animation="shake "+shakeTime+"s cubic-bezier(.36,.07,.19,.97) both"
setTimeout(function(){gameEl.style.animation=""},shakeTime*1000);}
function setBackground(image){log("Set background: "+image);var div=document.getElementById('bg');div.style.backgroundImage="url('"+image+"')";}
function setGravity(n){gravityForce=n;}
function setTerrain(n){log();terNo=n;setBackground(ters[n][0]);setGravity(ters[n][6])
terPts=terrain(resolution.x,resolution.y+20,ters[n][2],ters[n][3]);drawTerrain();}
function nextTerrain(){log("Choosing next terrain");terNo=(++terNo)%terMax;setTerrain(terNo);}
function randomTerrain(){terNo=getRandomInt(0,terMax-1);log("Choosing random terrain: "+terNo);setTerrain(terNo);}
function newGame(id){log("newGame id="+id);flashMessage("START!",1250);newRound=true;tankNo=0;for(var i in timeouts){window.clearTimeout(timeouts[i]);}
if(document.getElementById('wind-control-checkbox').checked){randomWind();}
else{windForce=0;}
updateDifficulty();initPlayers();overQ=false;showCompassQ=true;showMainMenu(false);showHud(true);var terSelect=document.getElementById('terrain-select-box');if(terSelect.selectedIndex==0){randomTerrain();}
else{terNo=terSelect.selectedIndex-1;setTerrain(terNo);}
particle_WeatherEnabled=Math.random()>.5;particles=[];resetTanks();drawTanks();updateHud();if(tanks[tankNo].aiq){aistt();}}
function newMatch(){demoModeEnabled=false;util.get('skip-ai-match-button').style.display="none";for(var i=0;i<tankPlayers;i++){var t=tanks[i];t.kills=0;t.money=startingMoney;t.weapons.map(function(e,idx){if(idx==0)return;e.ammo=0;})}}
function updateDifficulty(){if(document.getElementById("difficulty-easy").checked)difficulty=0;if(document.getElementById("difficulty-normal").checked)difficulty=1;if(document.getElementById("difficulty-hard").checked)difficulty=2;}
function randomWind(){windForce=Math.random()*maxWindForce;if(Math.random()>=.5)windForce*=-1;log('randomWind = '+windForce);}
function resetTanks(){log('Resetting tanks');var w=resolution.x;var range=w/3,tankStts=[[0,45],[w-range,135],[w*.25,135],[w*.75,45]];for(var i=0;i<tankPlayers;i++){var tank=tanks[i];tank.reset();tank.x=Math.max(0,Math.min(tankStts[i][0]+Math.random()*range,w));tank.dangle=tankStts[i][1];tank.aiq=false;var div=document.getElementById("playerType"+i);var s=div.options[div.selectedIndex].text;switch(s){case 'Human':tank.aiq=false;break;case 'Computer':tank.aiq=true;break;default:}}}
function updateAngleSlider(){var e=util.get('angle-range-control');var tank=tanks[tankNo];tank.dangle=Math.round(Number(e.value));tank.drawUI();playSound('aim');updateHud();}
function updateForceSlider(){var e=util.get('force-range-control');var tank=tanks[tankNo];tank.force=Number(e.value);tank.drawUI();updateHud();}
function forceUp(){var tank=tanks[tankNo];if(tank.force<20)tank.force+=0.1;tank.force=Number(tank.force.toFixed(1));tank.drawUI();document.getElementById('force-range-control').value=tank.force;}
function forceDown(){var tank=tanks[tankNo];if(tank.force>1)tank.force-=0.1;tank.force=Number(tank.force.toFixed(1));tank.drawUI();document.getElementById('force-range-control').value=tank.force;}
function angleDecrement(n){n=n||1;playSound('aim');var tank=tanks[tankNo];if(tank.dangle+n<200)tank.dangle+=n;tank.drawUI();document.getElementById('angle-range-control').value=tank.dangle;}
function angleIncrement(n){n=n||1;playSound('aim');var tank=tanks[tankNo];if(tank.dangle-n>-20)tank.dangle-=n;tank.drawUI();document.getElementById('angle-range-control').value=tank.dangle;}
function key(ev){var mainMenuButton=document.getElementById('main-menu-button');mainMenuButton.focus();mainMenuButton.blur();var tank=tanks[tankNo];if(!tank.loaded||tank.aiq)return;log("Handling key event ",ev)
var tank=tanks[tankNo];var keyCode=ev.keyCode;var yesq=false;switch(keyCode){case 37:angleDecrement(1);yesq=true;break;case 39:angleIncrement(1);yesq=true;break;case 38:forceUp();yesq=true;break;case 40:forceDown();yesq=true;break;case 65:move(-1);yesq=true;break;case 68:move(1);yesq=true;break;default:break;}
if(yesq){ev.preventDefault();}
if(keyCode==9||keyCode==13||keyCode==32){fire();ev.preventDefault();}
updateHud();}
function move(d){log("move",d);var tank=tanks[tankNo];var newPosition=tank.x+(tank.moveIncrement*d);if(newPosition<0||newPosition>resolution.x){flashMessage('Out of bounds');return;}
if(tank.fuel>0){tank.move(d);playSound('move');}
else{flashMessage('Out of Fuel');}}
function drawTerrain(){var canvas=document.getElementById('terrain-canvas');var ctx=canvas.getContext('2d');log("drawing terrain");ctx.clearRect(0,0,resolution.x,resolution.y);ctx.beginPath();var pattern=ctx.createPattern(document.getElementById(ters[terNo][5]),'repeat');ctx.fillStyle=pattern;ctx.strokeStyle="rgba(0,0,0,.3)";ctx.lineWidth=2;ctx.moveTo(0,terPts[0]);for(var t=1;t<terPts.length;t++){ctx.lineTo(t,terPts[t]);}
var w=resolution.x,h=resolution.y;ctx.lineTo(w+5,terPts[t]);ctx.lineTo(w+5,h+5);ctx.lineTo(-5,h+5);ctx.lineTo(-5,terPts[0]-5);ctx.closePath();ctx.fill();ctx.stroke();}
function drawTanks(){log('draw all the tanks');for(var i=0;i<tankPlayers;i++){log('draw tank: '+i);if(tanks[i])tanks[i].draw();}}
function frag(fromTank,toTank){log("frag.. (aka tank kill)",fromTank,toTank);var deadTanks=0;for(var i=0;i<tankPlayers;i++){deadTanks+=tanks[i].health<=0?1:0;}
if(deadTanks==tankPlayers-1){log('match is over')
overQ=true;}
if(titleMute)return;if(fromTank.id==toTank.id){s="Destroyed Self!";flashMessage(fromTank.name+" Destroyed Self!",1500,fromTank.clr,function(){if(overQ){var winner;for(var i=0;i<tankPlayers;i++)if(tanks[i].health>0){flashMessage(tanks[i].name+" Victory!",1500,tanks[i].clr,newGame);}}});}
else{fromTank.kills++;flashMessage(fromTank.name+' Destroyed '+toTank.name+'!',1500,fromTank.clr,function(){payTank(fromTank,winPayout);if(overQ)flashMessage(fromTank.name+" Victory!",1500,fromTank.clr,newGame);});}
updateHud();}
function fire(){newRound=false;showHud(false);tanks[tankNo].fire();}
function hideTitle(){newMatch();document.getElementById('main-menu-exit-button').style.display="block";titleMute=false;}
function showMainMenu(v){if(v==null)v=true;log("Show Main Menu: "+v);var el=document.getElementById("main-menu");el.style.right=v?"0":"3000px";showStoreMenu(false);showHud(!v);el.blur();}
function updateStoreCounts(){log('update store counts');var tank=tanks[tankNo];var valMap={'health-item':tank.health,'fuel-item':tank.fuel,'shield-item':tank.shields,'medium-shell-item':tank.weapons[1].ammo,'large-shell-item':tank.weapons[2].ammo,'atomic-shell-item':tank.weapons[3].ammo,'cannon-ball-item':tank.weapons[4].ammo,'air-strike-item':tank.weapons[5].ammo,'emp-item':tank.weapons[6].ammo}
for(var i in valMap){var el=document.getElementById(i);if(el){var cnt=el.getElementsByClassName('item-count')[0];if(cnt)cnt.innerHTML=valMap[i];}}}
function showStoreMenu(v){if(v==null)v=true;log("Show Items Menu: "+v);var el=document.getElementById("store-menu");el.style.bottom=v?"0":"200%";if(v)updateStoreCounts();showHud(!v);}
function showHud(v){if(v==null)v=true;log('Show Hud: '+v);var h=document.getElementById('hud');h.style.opacity=v?".75":"0";var d=document.getElementById('disabler-div');d.style.display=v?"none":"block";}
function randomWinner(){log("pick random winner");console.log('pick random winner');var winner=null;while(!winner){var t=util.randomArray(tanks);if(t.health>0)winner=t;}
console.log('winner is ',winner);for(var i in tanks){if(tanks[i]!==winner){var data={victim:tanks[i],aggressor:winner,type:"Napalm",damage:300}
doDamage(data);}}}
function nextTurn(){log('Next Turn');var humans=0;for(var i in tanks){if(!tanks[i].aiq&&tanks[i].health>0){humans++;}};if(humans<1&&!demoModeEnabled&&!skipAiRound){util.get('skip-ai-match-button').style.display='block';difficulty=25;}
if(skipAiRound){console.log('skip AI Round');skipAiRound=false;randomWinner();}
if(newRound){return;}
do{tankNo=(++tankNo)%tankPlayers;}
while(tanks[tankNo].health<=0)
showCompassQ=true;tanks[tankNo].drawUI();if(!overQ){showHud();var tank=tanks[tankNo];tank.loaded=true;if(tank.aiq)aistt();}
else{showHud(false);}
updateHud();}
function terrain(width,height,hts,smooth){log('Creating terrain');var pts=[],power=Math.pow(2,Math.ceil(Math.log(width)/(Math.log(2))));var htN=0;var displace=height*hts[htN];pts[0]=height/2+(Math.random()*displace*2)-displace;pts[power]=height/2+(Math.random()*displace*2)-displace;for(var i=1;i<power;i*=2){htN=Math.min(++htN,hts.length-1);displace=height*hts[htN];for(var j=(power/i)/2;j<power;j+=power/i){pts[j]=((pts[j-(power/i)/2]+pts[j+(power/i)/2])/2);pts[j]+=(Math.random()*displace*2)-displace;}}
var sm=1;var i=pts.length-1;prev=pts[i];var currSlope=0;while(i--){var slope=pts[i]-prev;if(slope>currSlope)currSlope=Math.min(slope,currSlope+smooth);if(slope<currSlope)currSlope=Math.max(slope,currSlope-smooth);pts[i]=prev+currSlope;var prev=pts[i];}
var i=pts.length-1;var max=pts[i];var min=pts[i];while(i--){max=Math.max(max,pts[i]);min=Math.min(min,pts[i]);}
var above=height-terBottomOffset*2-max;i=pts.length;while(i--){pts[i]+=above;}
return pts;}
function getDistance(x1,y1,x2,y2){return Math.sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));}
function getTanksTouching(x,y,r){var r=r||20;var touching=[]
for(var i=0;i<tankPlayers;i++){var d=getDistance(x,y,tanks[i].x,tanks[i].y);if(d<r){touching.push(tanks[i]);}}
return touching;}
function doDamage(data){if(data.victim.health<=0)return;shakeScreen();var dmgMod=Math.floor(data.damage/(data.victim.shields+1))
if(data.type=="EMP"){log("EMP DISABLED SHIELDS, ENGINE, & TARGETING");data.victim.health-=(data.victim.health*.25);data.victim.fuel=0;data.victim.shields=0;data.victim.targeting=0;}
else if(data.type=="Napalm"){log("Napalm damage: "+data.damage);data.victim.health-=dmgMod;}
else{log("Damage: "+data.damage);data.victim.shields=Math.max(0,data.victim.shields-1);data.victim.health-=dmgMod;}
if(data.victim.health<=0){data.victim.explode(data.aggressor);}
data.victim.draw();}
function drawSolidDot(ctx,color,x,y,r){r=r||10;ctx.fillStyle=color;ctx.beginPath();ctx.arc(x,y,r,0,2*Math.PI);ctx.fill();}
function drawParabola(ctx,color,pts,inc,rad){document.getElementById('fx-control-checkbox');if(!util.get('fx-control-checkbox').checked)return;if(!inc)inc=5;if(pts.length<1)return;ctx.fillStyle=color||'rgba(255,255,255,.3)';for(var i=1;i<pts.length;i+=inc){var r=rad||(i/pts.length*4);ctx.beginPath();ctx.arc(pts[i][0],pts[i][1],r,0,2*Math.PI,false);ctx.fill();}}
function drawCompass(ctx,circleX,circleY,tickRadius){var tickLen=12;for(var i=-15;i<=195;i+=15){var angle=i*Math.PI/180;if(i%90){ctx.strokeStyle='rgba(0,0,0,0.2)';ctx.lineWidth=1;}
else{ctx.strokeStyle='rgba(0,0,0,.8)';ctx.lineWidth=1;}
ctx.beginPath();var cX=circleX+Math.cos(angle)*tickRadius;var cY=circleY-Math.sin(angle)*tickRadius;ctx.moveTo(cX,cY);cX=circleX+Math.cos(angle)*(tickRadius+tickLen);cY=circleY-Math.sin(angle)*(tickRadius+tickLen);ctx.lineTo(cX,cY);ctx.stroke();}}
function drawArrow(ctx,fromx,fromy,tox,toy,thick,color){var headlen=1;var angle=Math.atan2(toy-fromy,tox-fromx);thick=thick||2;color=color||clrs[tankNo][1];ctx.lineCap="round";ctx.strokeStyle=color;ctx.lineWidth=thick;ctx.beginPath();ctx.moveTo(tox,toy);ctx.lineTo(tox-headlen*Math.cos(angle-Math.PI/7),toy-headlen*Math.sin(angle-Math.PI/7));ctx.lineTo(tox-headlen*Math.cos(angle+Math.PI/7),toy-headlen*Math.sin(angle+Math.PI/7));ctx.lineTo(tox,toy);ctx.lineTo(tox-headlen*Math.cos(angle-Math.PI/7),toy-headlen*Math.sin(angle-Math.PI/7));ctx.lineTo(fromx,fromy);ctx.stroke();}
function drawVector(ctx,x,y,angle,magnitude){var d=6*magnitude;var opacity=Math.max(Math.min((magnitude/20),.8),.3);var vx=d*Math.cos(angle*(Math.PI/180)),vy=-d*Math.sin(angle*(Math.PI/180)),clr='rgba(255,189,14,'+opacity+')';drawArrow(ctx,x,y-5,vx+x,vy+y,magnitude+3,'rgba(0,0,0,'+opacity/3+')');drawArrow(ctx,x,y-5,vx+x,vy+y,magnitude+2,clr);};function resizeCanvas(c){c.width=document.body.offsetWidth;c.height=document.body.offsetHeight;c.width=resolution.x*ratio;c.height=resolution.y*ratio;var ctx=c.getContext('2d');ctx.setTransform(ratio,0,0,ratio,0,0);ctx.translate(0.5,0.5);}
function createCanvas(id){var el=document.createElement('canvas');var div=document.getElementById('canvas-container');div.appendChild(el);el.id=id;resizeCanvas(el);return el;}
function getRandomInt(min,max){return Math.floor(Math.random()*(max-min+1))+min;}
function getDropdownHTML(opts,funcName,id,chkNo){var s='';s+='<select id="'+id+'">';for(var i=0;i<opts.length;i++){var idStr=id+i;var chkStr=i==chkNo?'selected':'';s+='<option id="'+idStr+'" value="'+opts[i]+'" style="height:21px;" '+chkStr+' >'+opts[i]+'</option>';}
s+='</select>';return s;}
function toggleGridInfo(){var c=document.getElementById('grid-info-panel');if(c.style.top=="0px"){c.style.top="-250px";c.style.opacity=".3";}
else{c.style.top="0px";c.style.opacity="1";}}
function toggleGrid(){var info=document.getElementById("grid-info-panel");var c=document.getElementById('grid-canvas');if(c.style.display=="none"){c.style.display="block";}
else{c.style.display="none";}
info.style.display=c.style.display;}
function drawGrid(){var c=document.getElementById('grid-canvas');var ctx=c.getContext('2d');var w=resolution.x,h=resolution.y;ctx.clearRect(0,0,w,h);var minor=50;var major=100;for(var i=0;i<w/minor;i++){if(i*minor%major==0){ctx.fillStyle='white';ctx.strokeStyle='white';ctx.fillText(i*minor,i*minor,h-10);}
else ctx.strokeStyle='rgba(0,0,0,.3)';ctx.beginPath();ctx.moveTo(i*minor,0);ctx.lineTo(i*minor,h);ctx.stroke();}
for(var i=0;i<h/minor;i++){ctx.beginPath();if(i*minor%major==0){ctx.fillStyle='white';ctx.strokeStyle='white';ctx.fillText(i*minor,0,h-i*minor);}
else ctx.strokeStyle='rgba(0,0,0,.3)';ctx.moveTo(0,i*minor);ctx.lineTo(w,i*minor);ctx.stroke();}}
function Tank(n){log("New tank");this.x=0;this.y=0;this.moveIncrement=5;this.vX=0;this.vY=0;this.shellX=-1000;this.shellY=-1000;this.shellPoints=[];this.dangle=90;this.force=10;this.frame=0;this.health=100;this.shields=0;this.targeting=0;this.fuel=25;this.loaded=true;this.id=n;this.clr='blue';this.name='Blue';this.kills=0;this.money=startingMoney;this.weapons=[{name:'Small Shell',size:2,ammo:-1,damage:18},{name:'Medium Shell',size:3.3,ammo:0,damage:28},{name:'Large Shell',size:4,ammo:0,damage:37},{name:'Atomic Shell',size:4.5,ammo:0,damage:70},{name:'Cannon Ball',size:2.5,ammo:0,damage:30},{name:'Air Strike',size:1,ammo:0,damage:20,strikes:9,spread:200,blastTime:100},{name:'EMP',size:3,ammo:0,damage:100},{name:'Napalm',size:2,ammo:0,damage:10},{name:'Sniper Shell',size:1,ammo:0,damage:100},{name:'Flak Cannon',size:1,ammo:0,damage:0}];this.currentWeapon=0;this.aiq=false;this.aiDirn=1;this.reset();this.uiCanvas=createCanvas('tank-'+this.id+"-ui-canvas");this.spriteCanvas=createCanvas('tank-'+this.id+"-sprite-canvas")
this.effectCanvas=createCanvas('tank-'+this.id+"-effect-canvas");this.fireanim_lastframe=0;this.fireanim_step=16;this.fireanim_acc=0;}
Tank.prototype.cleanupAndRemove=function(){this.uiCanvas.remove();this.effectCanvas.remove();this.spriteCanvas.remove();this.isDeleted=true;}
Tank.prototype.reset=function(){this.x=0;this.y=0;this.vX=0;this.vY=0;this.shellX=-1000;this.shellY=-1000;this.shellPoints=[];this.dangle=90;this.force=10;this.loaded=true;this.frame=0;if(this.health<=0){this.health=100;this.shields=0;this.targeting=0;this.fuel=25;}}
Tank.prototype.aifire=function(force,dangle){log("Tank AI Fire");var best=1e10;var worst=1e10;var shellX=this.barrelX;var shellY=this.barrelY;var angle=dangle*(Math.PI/180);var vX=Math.cos(angle)*force/5;var vY=Math.sin(angle)*force/5;shellX+=vX*2;shellY-=vY*2;var movingq=true;do{vY-=gravityForce;shellX+=vX*3;shellY-=vY*2;if(shellX>0&&shellX<resolution.x){var xPos=shellX<<0;var yPos=terPts[xPos];var ht=yPos-shellY;if(ht>0){}else{best=1e10;worst=1e10;for(var j=0;j<tankPlayers;j++){var t=tanks[j];if(t.health>0){if(t==this){worst=Math.min(worst,Math.abs(xPos-t.x));}else{best=Math.min(best,Math.abs(xPos-t.x));}}}
movingq=false;}}else{movingq=false;}}while(movingq);var selfDmgDist=60;if(worst<selfDmgDist){best+=(selfDmgDist-worst)*3;}
return best;};Tank.prototype.move=function(d){this.fuel-=Math.abs(d);this.x+=this.moveIncrement*d;this.draw();};Tank.prototype.fire=function(){newRound=false;var w=this.weapons[this.currentWeapon];log("Tank fires "+w.name);if(w.ammo===0||!this.loaded){playSound('emptyclip');return;}
showCompassQ=false;this.drawUI();if(this.health<=0)return;playSound('fire');this.shellX=this.barrelX;this.shellY=this.barrelY;this.shellPoints=[];var angle=this.dangle*(Math.PI/180);this.vX=Math.cos(angle)*this.force/5;this.vY=Math.sin(angle)*this.force/5;this.shellX+=this.vX*2;this.shellY-=this.vY*2;w.ammo-=1;this.targeting=Math.max(0,--this.targeting);this.loaded=false;var weaponName=this.weapons[this.currentWeapon].name;if(weaponName=='Cannon Ball'){this.bombOnGround=false;this.bombTimer=5000;this.fireAnim();this.muzzle();}
else if(weaponName=='Air Strike'){for(var i=0;i<3;i++){var plane=particleFactory.plane(this);}
this.endTurn();}
else if(weaponName=='Flak Cannon'){var bullets_to_create=10;var speed=100;var spread=30;for(var i=0;i<bullets_to_create;i++){var b=particleFactory.bullet(this);b.launch(this.shellX,this.shellY,this.vX*speed,this.vY*-speed,spread);}
this.endTurn();}
else{this.fireAnim();this.muzzle();};};Tank.prototype.fireAnim=function(ts){var dt=(ts-this.fireanim_lastframe)||0;this.fireanim_acc+=dt;this.fireanim_lastframe=ts;if(this.isDeleted)return;var g=this.effectCanvas.getContext('2d');this.vY-=gravityForce;this.shellX+=this.vX*3;this.shellY-=this.vY*2;if(this.fireanim_acc>=this.fireanim_step){this.shellPoints.push([this.shellX,this.shellY]);this.drawProjectiles();this.fireanim_acc=0;}
if(this.shellX>0&&this.shellX<resolution.x){this.lastShotOutOfBounds=false;var xPos=this.shellX<<0;var yPos=terPts[xPos];var ht=yPos-this.shellY;var touchingTanks=getTanksTouching(this.shellX,this.shellY);var weaponName=this.weapons[this.currentWeapon].name;if(ht>0&&touchingTanks.length<=0){requestAnimationFrame(this.fireAnim.bind(this));if(weaponName=='Napalm'){if(Math.random()>.6){var p=particleFactory.napalm(this);p.position.x=this.shellX;p.position.y=this.shellY;p.velocity.x=this.vX;p.velocity.y=0;}}}
else{log(weaponName+' projectile impact');if(weaponName=='Cannon Ball'){if(!this.bombOnGround){log("Cannon ball hit ground")
this.bombOnGround=true;this.bombStartTime=ts;this.bombTimer=2500;requestAnimationFrame(this.fireAnim.bind(this));}
else{this.shellY=yPos;this.vY=0;this.vX*=.98;var nextPoint=this.shellX+this.vX;var nextY=terPts[nextPoint<<0];var uphill=nextY<yPos;if(uphill){this.vx*=.4;}
var bombTouchingTank=false;for(var i=0;i<tankPlayers;i++){if(tanks[i].health>0){var dx=Math.abs(tanks[i].x-this.shellX);var dy=Math.abs(tanks[i].y-this.shellY);if(dx<this.weapons[this.currentWeapon].damage&&dy<this.weapons[this.currentWeapon].damage){bombTouchingTank=true;}}}
var elapsedTime=ts-this.bombStartTime;if(elapsedTime>this.bombTimer||bombTouchingTank){log("cannon ball exploded");this.loaded=true;this.bang(this.shellX,this.shellY);this.bombOnGround=false;}
else{requestAnimationFrame(this.fireAnim.bind(this));}}}
else{log('this thing should blow up now');this.bang(this.shellX,this.shellY);}}}
else{log("projectile out of bounds");this.lastShotOutOfBounds=true;log('time to end turn');this.endTurn()}};Tank.prototype.explode=function(from){if(overQ)return;playSound('explode');var e=document.getElementById('explosion');var offsetX=this.effectCanvas.offsetLeft;var offsetY=this.effectCanvas.offsetTop;e.style.top=(ratio*this.y-20+offsetX)+"px";e.style.left=(ratio*this.x-20+offsetY)+"px";e.src="images/sprites/explode.gif";log("tank explode");frag(from,this);};Tank.prototype.muzzle=function(){log('muzzle');this.muzzleAnim();};Tank.prototype.muzzleAnim=function(){log('muzzleAnim');var fireNow=Date.now();var g=this.effectCanvas.getContext('2d');g.clearRect(0,0,resolution.x,resolution.y);if(fireNow<500){g.fillStyle='#ee0';g.beginPath();g.arc(this.barrelX,this.barrelY,fireNow/70,0,2*Math.PI);g.closePath();g.fill();requestAnimationFrame(this.muzzleAnim.bind(this));}};Tank.prototype.bang=function(x,y){log('bang');this.shellX=-1000;this.shellY=-1000;this.bangX=x;this.bangY=y;this.bangStt=Date.now();this.lastFiredWeapon=this.currentWeapon;var sz=this.weapons[this.currentWeapon].damage;var xi=x<<0;var yHt=terPts[xi]+sz*0.5;var min=Math.max(0,xi-sz*3)<<0;var max=Math.min(resolution.x,xi+sz*3)<<0;if(this.weapons[this.currentWeapon].name!="EMP"&&this.weapons[this.currentWeapon].name!="Sniper Shell"){for(var i=min;i<max;i++){var d=Math.abs(xi-i);d*=d/sz*0.3;terPts[i]=Math.max(terPts[i],yHt-d);terPts[i]=Math.min(terPts[i],resolution.y-terBottomOffset);}
if(document.getElementById('fx-control-checkbox').checked){var params={n:sz*2,vx:((this.vX*30)),vy:((this.vY*2))-(sz*2)-50,y:terPts[Math.round(x)]}
for(var i=0;i<params.n/2;i++){var p=particleFactory.dirt();p.position.x=x+(Math.random()*sz*1.5)-(sz*.75);p.position.y=terPts[Math.round(x)];p.velocity.y+=params.vy;p.velocity.x+=params.vx;}
for(var i=0;i<params.n;i++){var p=particleFactory.smoke();p.position.x=x+(Math.random()*sz/2)-(sz/4);p.position.y=y+5;}}
if(this.lastFiredWeapon==7){for(var i=0;i<50;i++){var p=particleFactory.napalm(this);p.position.x=x+(Math.random()*sz/2)-(sz/4);p.position.y=y;}}}
for(var i=0;i<tankPlayers;i++){tank=tanks[i];var d=Math.abs(tank.x-xi);if(tank.health>=0&&(d<sz*2)){log('do damage');var dmgData={victim:tank,aggressor:this,type:this.weapons[this.currentWeapon].name,damage:Math.round(sz*2-d)}
var weaponName=this.weapons[this.currentWeapon].name;if(weaponName=="Sniper Shell"){if(d<16){doDamage(dmgData);if(dmgData.victim!==dmgData.aggressor){payTank(dmgData.aggressor,Math.round(hitPayout-(d*2)));}
flashMessage('Direct Hit!',1000,"#fff");}
else{flashMessage('Sniper Missed!',1000,"#fff");}}
else{doDamage(dmgData);if(dmgData.victim!==dmgData.aggressor){payTank(dmgData.aggressor,Math.round(hitPayout-(d*2)));}}}}
if(this.lastFiredWeapon==3){log('atomic shell explosion');var offsetX=this.effectCanvas.offsetLeft;var offsetY=this.effectCanvas.offsetTop;var e=document.getElementById('explosion-nuke');e.style.left=(ratio*this.bangX-80+offsetX)+"px";e.style.top=(ratio*this.bangY-90+offsetY)+"px";e.style.width="160px";e.style.height="114px";e.src="images/sprites/nuke.gif";}
playSound('bang');this.bangAnim();drawTerrain();drawTanks();};Tank.prototype.endTurn=function(){log('tank endTurn');console.log('tank end turn');for(var i in particles){if(particles[i].owner===this){log('particles still in play. Waiting ');setTimeout(this.endTurn.bind(this),2000);return;}}
clearParticleCanvas();var weaponName=this.weapons[this.currentWeapon].name;this.effectCanvas.getContext('2d').clearRect(0,0,resolution.x,resolution.y);log('Ok now its really time for next turn');nextTurn();}
Tank.prototype.bangAnim=function(){var g=this.effectCanvas.getContext('2d');g.clearRect(0,0,resolution.x,resolution.y);var elapsed=Date.now()-this.bangStt;var progress=elapsed/1000;var weaponType=this.lastFiredWeapon?this.weapons[this.lastFiredWeapon]:this.weapons[this.currentWeapon];var explosionTime=weaponType.blastTime||800;var r=4*progress*weaponType.damage;if(elapsed<explosionTime){var alpha=(1000-elapsed)/1000;if(weaponType.name=="EMP"){g.fillStyle='rgba(0,100,200,'+alpha+')';}
else if(weaponType.name=="Atomic Shell"){g.fillStyle='rgba(220,255,10,'+alpha+')';}
else{g.fillStyle='rgba(200,100,0,'+alpha+')';}
g.beginPath();g.arc(this.bangX,this.bangY,r,0,2*Math.PI);g.closePath();g.fill();g.fillStyle="rgba(255,100,100,.2)";g.beginPath();g.arc(this.bangX,this.bangY,r/2,0,2*Math.PI);g.closePath();g.fill()
requestAnimationFrame(this.bangAnim.bind(this));}
else{this.endTurn();}};Tank.prototype.drawSprite=function(){var tankWidth=26,tankHeight=18;this.y=terPts[this.x<<0];var g=this.spriteCanvas.getContext('2d');var w=resolution.x,h=resolution.y;g.clearRect(0,0,w,h);function getImg(name,frame){return document.getElementById(name.toLowerCase()+"-tank-"+frame+"-img");}
img=getImg(this.name,this.frame+1);if(this.health<=0)img=getImg('dead',1);g.drawImage(img,this.x-tankWidth/2,this.y-tankHeight/1.1,tankWidth,tankHeight);if(this.shields>0){var r=(this.shields+15);var grd=g.createRadialGradient(this.x,this.y-20,r/4,this.x,this.y,r*2);grd.addColorStop(0,'rgba(0,189,240,.2)');grd.addColorStop(0.8,'rgba(0,200,255,.7)');grd.addColorStop(.9,'rgba(0,189,240,0)');grd.addColorStop(1,'rgba(0,0,0,0)');g.fillStyle=grd;g.fillRect(this.x-100,this.y-100,200,200);}}
Tank.prototype.drawProjectiles=function(){var g=this.effectCanvas.getContext('2d');g.clearRect(0,0,resolution.x,resolution.y);if(this.shellPoints.length>0){drawParabola(g,this.color,this.shellPoints,2);}
var ht=terPts[Math.round(this.shellX)]-this.shellY;if(ht>0){g.fillStyle=this.clr;g.lineWidth=1;g.strokeStyle='rgba(0,0,0,.1)';g.beginPath();var r=this.weapons[this.currentWeapon].size;g.arc(this.shellX,this.shellY,r,0,2*Math.PI);g.closePath();g.fill();g.stroke();}}
Tank.prototype.drawUI=function(){var g=this.uiCanvas.getContext('2d');g.clearRect(0,0,resolution.x,resolution.y);var sz=12,barrelOffset={x:0,y:-sz*0.8},barrelLength=sz*1.5,barrelWidth=sz*0.2,angle=this.dangle*(Math.PI/180);if(this.id==tankNo&&showCompassQ){var userAng=this.dangle;if(userAng>90)userAng=180-userAng;drawVector(g,this.x+barrelOffset.x,this.y+barrelOffset.y/2,this.dangle,this.force);g.textAlign='center';g.font='16px uiFont';g.fillStyle=this.clr;g.fillText(userAng+'\u00B0',this.x,this.y-55);g.font='14px uiFont';g.fillText(this.force,this.x,this.y+20);drawCompass(g,this.x+barrelOffset.x,this.y+barrelOffset.y/2,25);var points=[];var tank=this;var a=tank.dangle*(Math.PI/180);var m=.5,n=50*tank.targeting,int=5;var p={x:tank.barrelX,y:tank.barrelY},v={x:Math.cos(a)*tank.force/5,y:Math.sin(a)*tank.force/5}
for(var i=0;i<n;i++){v.y-=gravityForce*m;p.x+=m*v.x*3;p.y-=m*v.y*2;var ht=terPts[Math.round(p.x)]-p.y;if(ht>0){points.push([p.x,p.y]);}else break;}
drawParabola(g,tank.clr,points,int);}
if(this.health>0){g.fillStyle="lime";g.fillRect(this.x-12,this.y+5,this.health/100*24,2);g.fillStyle=this.clr;g.strokeStyle=this.clr;g.lineWidth=barrelWidth;g.lineCap="butt";g.beginPath();g.moveTo(this.x+barrelOffset.x,this.y+barrelOffset.y);this.barrelX=this.x+Math.cos(angle)*barrelLength;this.barrelY=this.y-8-Math.sin(angle)*barrelLength;g.lineTo(this.barrelX,this.barrelY);g.stroke();}}
Tank.prototype.draw=function(){this.drawSprite()
this.drawUI();};var particles=[];var particles_pool=[];var particlesToRemove=[];var particleFrame=0;var particleAcc=0;var particleStep=28
var weatherAcc=0;var particleBounds=getBounds();function clearParticleCanvas(){var c=util.get('particle-canvas');var ctx=c.getContext('2d');ctx.clearRect(0,0,resolution.x,resolution.y);}
function getNewParticle(owner){if(particles_pool.length>0){var p=particles_pool[0];particles_pool.splice(0,1);p.reset();p.owner=owner;return p;}
return new Particle(owner);}
function getBounds(arr){if(!arr||!Array.isArray(arr)||arr.length<1)return{x:0,y:0,w:0,h:0}
var minX=arr[0].x,minY=arr[0].y,maxX=minX+arr[0].w,maxY=minY+arr[0].h;arr.map(function(){minX=Math.min(arr[i].x,minX);minY=Math.min(arr[i].y,minY);maxX=Math.max(arr[i].x+arr[i].w,maxX);maxY=Math.max(arr[i].y+arr[i].h,maxY);});return{x:minX,y:minY,w:maxX-minX,h:maxY-minY}}
function removeDeadParticles(){if(particlesToRemove.length>0){particlesToRemove.forEach(function(e){particles_pool.push(e);var idx=particles.indexOf(e);if(idx>-1)particles.splice(idx,1);})
particlesToRemove=[];}}
function updateParticles(ts){var ctx=util.get('particle-canvas').getContext('2d');var dt=(ts-particleFrame)||0;particleAcc+=dt;particleFrame=ts;weatherAcc+=dt;var sfx_enabled=util.get('fx-control-checkbox').checked;if(weatherAcc>300&&particle_WeatherEnabled&&sfx_enabled){for(var i=0;i<3;i++){weatherAcc=0;var x=Math.floor(Math.random()*resolution.x);var p;if(terNo==2){p=particleFactory.snow();p.position.y=0;p.position.x=x;}}}
while(particleAcc>=particleStep){particleAcc-=particleStep;ctx.clearRect(particleBounds.x,particleBounds.y,particleBounds.w,particleBounds.h);removeDeadParticles();if(particles.length>0){var r=particles[0].getBounds();var minX=r.x,minY=r.y,maxX=minX+r.w,maxY=minY+r.h;for(var i=0;i<particles.length;i++){if(particles[i].onUpdate){particles[i].onUpdate(particleStep);}
var r=particles[i].getBounds();minX=Math.min(r.x,minX);minY=Math.min(r.y,minY);maxX=Math.max(r.x+r.w,maxX);maxY=Math.max(r.y+r.h,maxY);particles[i].update(particleStep/1000);particles[i].render();}
particleBounds={x:minX,y:minY,w:maxX-minX,h:maxY-minY};}}
requestAnimationFrame(updateParticles);}
function removeParticle(particle){particle.disabled=true;particlesToRemove.push(particle);}
function holeInTheGround(x,w,d){for(var i=x-w;i<(x+w);i++){d1=d-Math.abs(x-i);terPts[Math.round(i)]=Math.min(resolution.y-terBottomOffset,terPts[Math.round(i)]+d1);}
if(d>20){for(var i=0;i<10;i++){var p=particleFactory.dirt();p.position.x=x+(Math.random()*5)-(2.5);p.position.y=terPts[Math.round(x)]-3;p.velocity.y=-Math.random()*100;p.velocity.x+=Math.random()*30-15}}
drawTerrain();drawTanks();}
function Particle(owner){this.reset();this.owner=owner;}
Particle.prototype.getBounds=function(){var s=this.size*2;var x=this.position.x;var y=this.position.y;var r={x:0,y:0,w:s,h:s};if(this.type=="ball"){r.x=x-r.w/2-1;r.y=y-r.h/2;}
else if(this.type=="block"){r.x=x-1;r.y=y-1;}
return r;}
Particle.prototype.reset=function(){this.disabled=false;this.corrosive=false;this.owner=null;this.damage=0;this.size=25;this.time=0;this.maxTime=0;this.position={x:0,y:0};this.velocity={x:0,y:0};this.bombTime=0;this.bombAcc=0;this.type=Math.random()>.5?"ball":"block";this.color="purple";this.physical=true;this.hasMass=true;this.hasWindResistance=false;this.onUpdate=null;this.image=null;}
Particle.prototype.launch=function(x,y,vx,vy,drift){drift=drift||0;this.position.x=x+(Math.random()*(drift/2))-drift/4;this.position.y=y+(Math.random()*(drift/2))-drift/4;this.velocity.x=vx+(Math.random()*drift)-drift/2;this.velocity.y=vy+(Math.random()*drift)-drift/2;}
Particle.prototype.getAltitude=function(){return terPts[Math.round(this.position.x)]-this.position.y;}
Particle.prototype.update=function(deltaTime){this.position.x+=this.velocity.x*deltaTime;this.position.y+=this.velocity.y*deltaTime;if(this.hasMass){this.velocity.y+=gravityForce*100;}
if(this.hasWindResistance){this.velocity.x-=this.velocity.x*.01;}
if(this.maxTime>0){this.time+=deltaTime;if(this.time>=this.maxTime)removeParticle(this);}
if(this.position.x<0||this.position.x+this.size>resolution.x||(this.position.y<-100)||this.position.y+this.size>resolution.y){removeParticle(this);}
if(this.corrosive){if(this.owner){var arr=getTanksTouching(this.position.x,this.position.y,this.size*2);for(var i in arr){var data={victim:arr[i],aggressor:this.owner,type:"Napalm",damage:this.damage}
doDamage(data);removeParticle(this);}}}
if(this.physical){var h=this.getAltitude();if(h<=0){if(this.corrosive){holeInTheGround(this.position.x,this.size,this.size)
drawTerrain();drawTanks();removeParticle(this)}
else{this.position.y=terPts[Math.round(this.position.x)];this.velocity.y=10;}}}}
Particle.prototype.render=function(){var ctx=util.get('particle-canvas').getContext('2d');ctx.strokeWidth=0;ctx.strokeStyle=this.color;ctx.fillStyle=this.color;if(this.type=="block"){ctx.fillRect(this.position.x,this.position.y,this.size,this.size);}
else if(this.type=="ball"){ctx.beginPath();ctx.arc(this.position.x,this.position.y,this.size/2,0,2*Math.PI)
ctx.fill();}
if(this.image){ctx.drawImage(this.image,this.position.x,this.position.y,this.size,this.size);}}
var particleFactory={bullet:function(owner){var p=getNewParticle(owner);p.corrosive=true;p.physical=true;p.hasMass=true;p.damage=15;p.size=5;p.time=0;p.maxTime=2000;p.velocity.x=10;p.velocity.y=-10;p.color='black';particles.push(p);return p;},napalm:function(owner){var p=getNewParticle(owner);p.corrosive=true;p.physical=true;p.hasMass=true;p.hasWindResistance=true;p.damage=10;p.size=Math.random()*3+2;p.time=0;p.maxTime=Math.random()*6+4;p.velocity.x=Math.random()*250-125;p.velocity.y=-Math.random()*150-75;p.color='#fbe658';var r=Math.random();if(r<.3)p.color='#4b4044';else if(r<.6)p.color='#aa2316';else if(r<.9)p.color='#fa5429';particles.push(p);return p;},snow:function(owner){var p=getNewParticle(owner);p.size=Math.random()*5+2;p.hasMass=false;p.time=0;p.velocity.y=Math.random()*100+50;p.maxTime=Math.random()*20;p.color='white';particles.push(p);return p;},dirt:function(owner){var p=getNewParticle(owner);p.size=Math.random()*3+2;p.time=0;p.velocity.x=Math.random()*40-20;p.velocity.y=Math.random()*40-20;p.maxTime=Math.random()*2;p.color=ters[terNo][1];particles.push(p);return p;},shrapnel:function(owner){var p=getNewParticle();p.size=Math.random()*4+2;p.velocity.x=200*Math.random()-100
p.velocity.y=200*Math.random()-100;p.time=0;p.type='ball'
var r=Math.random();p.maxTime=r;p.velocity.x=Math.random()*30-15;p.velocity.y=Math.random()*30-15;if(r<.8)p.color="rgba(255,0,0,.3)";else p.color="rgba(200,100,0,.2)";particles.push(p);return p;},smoke:function(owner){var p=getNewParticle(owner);var r=Math.random();if(r>.3)p.color='rgba(0,0,0,.5)';else p.color='rgba(255,0,0,.5)';p.physical=false;p.hasMass=false;p.time=0;p.maxTime=r<.6?Math.random()*2.5:r*1.8;p.size=Math.random()*3+1
p.velocity.x=30*Math.random()-15
p.velocity.y=Math.random()*-50;particles.push(p)
return p;},plane:function(owner){var p=getNewParticle(owner);p.color="rgba(0,0,0,0)";p.image=util.get('plane-img');p.size=40;p.position.x=0;p.position.y=10+(Math.random()*30);p.physical=false;p.hasMass=false;p.time=0;p.maxTime=5000;p.velocity.x=100+(Math.random()*200);p.velocity.y=0;p.bombTime=500;p.bombAcc=p.bombTime;p.onUpdate=function(dt){p.bombAcc+=dt;if(p.bombAcc>=p.bombTime){p.bombAcc=0;var dist=99999;if(p.owner){dist=Math.abs((p.owner.x+13)-(p.position.x+p.size/2));if(p.position.x<p.owner.x)dist-=p.velocity.x*.2;}
if(dist>60){var b=particleFactory.bomb(p.owner);b.position.x=p.position.x+p.size/2;b.position.y=p.position.y+p.size;b.velocity.x=p.velocity.x*.1;b.velocity.y=10;}}}
particles.push(p);return p;},bomb:function(owner){var p=getNewParticle(owner);p.color="rgba(0,0,0,0)";p.image=util.get('bomb-img');p.size=25;p.physical=true;p.hasMass=true;p.corrosive=true;p.hasWindResistance=true;p.damage=35;p.time=0;p.maxTime=5000;particles.push(p);return p;}}
function ParticleEmitter(func,delay){this.delay=100;this.acc=0;this.particleFunc=func;this.position={x:0,y:0};this.velocity={x:0,y:0};}
ParticleEmitter.prototype.update=function(dt){this.acc+=dt;if(this.acc>this.delay){this.acc=0;this.position.x+=this.velocity.x*dt;this.position.y+=this.velocity.y*dt;if(this.particleFunc)this.particleFunc();}}