var spritedefs={player:{img:'player.walk',img_w:47,img_h:59,img_off_x:24,img_off_y:54,angles:8,frames:4,speed:250,height:0.6,radius:0.1},barrel:{img:'barrel',img_w:25,img_h:34,img_off_x:13,img_off_y:30,angles:1,frames:2,speed:500,height:0.3,radius:0.1}};var texture_data={loading:'iVBORw0KGgoAAAANSUhEUgAAADAAAAAgAQMAAABuGmlfAAAABlBMVEUAAAD//wCI23BQAAAAO0lEQVQI12P4DwYMDQwMIEwdarHkKZ/FkgxLlmoHLFnKsGSv1rUle4E8rSAgb7fqKZ/dqtS1DysF8RgATqM0NkkHKJUAAAAASUVORK5CYII=',error:'iVBORw0KGgoAAAANSUhEUgAAADAAAAAgAQMAAABuGmlfAAAABlBMVEUAAAD/AAAb/40iAAAAMUlEQVQI12P4DwYMDQwMIEwh1V/c8wBIdXgFTQBSfRCqo3gSkmC/l88Eyi0igoJ4DADAqDKnz0GfcgAAAABJRU5ErkJggg=='};const mipmap_max=7;const mipmap_min=3;const mipmap_enabled=1;const texture_u_repeat=192/128;const texture_v_repeat=144/128;var options_flags={gradient_surfaces:1,horizontal_scale:8,low_textures:1,map:1,draw_from_canvas:0,draw_pattern_walls:0,no_alpha_texture:0,opera_context:0,opera_hack:1,double_buffer:0,textured_floors:0};if(navigator.userAgent.indexOf("Opera")!=-1)
{options_flags.draw_from_canvas=1;options_flags.no_alpha_texture=1;options_flags.double_buffer=1;}
else
{options_flags.draw_from_canvas=0;if(options_flags.draw_pattern_walls)
{options_flags.no_alpha_texture=1;}}
function $(id)
{return document.getElementById(id);}
function debug(str)
{$('status').value=str;}
const DOM_VK={CANCEL:3,HELP:6,BACK_SPACE:8,TAB:9,CLEAR:12,RETURN:13,ENTER:14,SHIFT:16,CONTROL:17,ALT:18,PAUSE:19,CAPS_LOCK:20,ESCAPE:27,SPACE:32,PAGE_UP:33,PAGE_DOWN:34,END:35,HOME:36,LEFT:37,UP:38,RIGHT:39,DOWN:40,PRINTSCREEN:44,INSERT:45,DELETE:46,0:48,1:49,2:50,3:51,4:52,5:53,6:54,7:55,8:56,9:57,SEMICOLON:59,EQUALS:61,A:65,B:66,C:67,D:68,E:69,F:70,G:71,H:72,I:73,J:74,K:75,L:76,M:77,N:78,O:79,P:80,Q:81,R:82,S:83,T:84,U:85,V:86,W:87,X:88,Y:89,Z:90,CONTEXT_MENU:93,NUMPAD0:96,NUMPAD1:97,NUMPAD2:98,NUMPAD3:99,NUMPAD4:100,NUMPAD5:101,NUMPAD6:102,NUMPAD7:103,NUMPAD8:104,NUMPAD9:105,MULTIPLY:106,ADD:107,SEPARATOR:108,SUBTRACT:109,DECIMAL:110,DIVIDE:111,F1:112,F2:113,F3:114,F4:115,F5:116,F6:117,F7:118,F8:119,F9:120,F10:121,F11:122,F12:123,F13:124,F14:125,F15:126,F16:127,F17:128,F18:129,F19:130,F20:131,F21:132,F22:133,F23:134,F24:135,NUM_LOCK:144,SCROLL_LOCK:145,COMMA:188,PERIOD:190,SLASH:191,BACK_QUOTE:192,OPEN_BRACKET:219,BACK_SLASH:220,CLOSE_BRACKET:221,QUOTE:222,META:224};(function(){var m={'\b':'\\b','\t':'\\t','\n':'\\n','\f':'\\f','\r':'\\r','"':'\\"','\\':'\\\\'},s={array:function(x){var a=['['],b,f,i,l=x.length,v;for(i=0;i<l;i+=1){v=x[i];f=s[typeof v];if(f){v=f(v);if(typeof v=='string'){if(b){a[a.length]=',';}
a[a.length]=v;b=true;}}}
a[a.length]=']';return a.join('');},'boolean':function(x){return String(x);},'null':function(x){return"null";},number:function(x){return isFinite(x)?String(x):'null';},object:function(x){if(x){if(x instanceof Array){return s.array(x);}
var a=['{'],b,f,i,v;for(i in x){v=x[i];f=s[typeof v];if(f){v=f(v);if(typeof v=='string'){if(b){a[a.length]=',';}
a.push(s.string(i),':',v);b=true;}}}
a[a.length]='}';return a.join('');}
return'null';},string:function(x){if(/["\\\x00-\x1f]/.test(x)){x=x.replace(/([\x00-\x1f\\"])/g,function(a,b){var c=m[b];if(c){return c;}
c=b.charCodeAt();return'\\u00'+
Math.floor(c/16).toString(16)+
(c%16).toString(16);});}
return'"'+x+'"';}};this.toJSONString=function(obj){return s[typeof obj](obj);};this.parseJSON=function(str){try{return!(/[^,:{}\[\]0-9.\-+Eaeflnr-u \n\r\t]/.test(str.replace(/"(\\.|[^"\\])*"/g,'')))&&eval('('+str+')');}catch(e){return false;}};this.parseJSON_except=function(str){var j=parseJSON(str);if(!j){throw new Error("Invalid JSON string: "+str);}
return j;};this.cloneViaJSON=function(obj){return eval('('+this.toJSONString(obj)+')');};})();const request_http_privilege=true;const http_filestore_domain='zaynar.demon.co.uk';const http_filestore='http://zaynar.demon.co.uk/misc2/doomcanvas/cgi-bin/filestore.cgi';const http_filestore_xdm='http://zaynar.demon.co.uk/misc2/doomcanvas/filestore_xdm.html';function save_to_file_store(name,data)
{try
{if(request_http_privilege)
{netscape.security.PrivilegeManager.enablePrivilege('UniversalBrowserRead');}
var json=toJSONString(data);var req=new XMLHttpRequest();req.open('POST',http_filestore+'?action=save&name='+escape(name),false);req.send(json);return true;}
catch(e)
{alert(e);return false;}}
function load_from_file_store(name)
{try
{if(request_http_privilege)
{netscape.security.PrivilegeManager.enablePrivilege('UniversalBrowserRead');}
var req=new XMLHttpRequest();req.open('GET',http_filestore+'?action=load&name='+escape(name),false);req.send(null);var res=parseJSON(req.responseText);if(res)
{return parseJSON(res.data);}
else
{return null;}}
catch(e)
{alert(e);return null;}}
function load_from_file_store_async_xmlhttp(name,handler)
{var req=new XMLHttpRequest();req.onreadystatechange=function()
{if(req.readyState==4)
{var res=parseJSON(req.responseText);if(res)
{handler(parseJSON(res.data));}
else
{handler();}}};req.open('GET',http_filestore+'?action=load&name='+escape(name),true);req.send(null);}
function load_from_file_store_async(name,handler)
{try
{if(document.domain==http_filestore_domain)
{load_from_file_store_async_xmlhttp(name,handler);return true;}}
catch(e)
{alert(e);}
try
{if(document.postMessage)
{var obj=$('xdm_object');function on_message(e)
{if(e.source==obj.contentDocument)
{document.removeEventListener('message',on_message,false);var res=parseJSON(e.data);if(res.error)
{alert('Failed to retrieve map data: '+unescape(res.error));handler();}
else
{handler(parseJSON(res.data));}}}
document.addEventListener('message',on_message,false);if(!obj)
{obj=document.createElementNS('http://www.w3.org/1999/xhtml','object');obj.id='xdm_object';$('xdm_container').appendChild(obj);obj.addEventListener('load',function()
{obj.contentDocument.postMessage(name);},false);obj.data=http_filestore_xdm;}
else
{if(obj.contentDocument&&obj.contentDocument.postMessage)
{obj.contentDocument.postMessage(name);}
else
{setTimeout(load_from_file_store_async,100,name,handler);}}
return true;}}
catch(e)
{alert(e);}
try
{if(request_http_privilege&&(document.domain===''||document.domain=='localhost'))
{netscape.security.PrivilegeManager.enablePrivilege('UniversalBrowserRead');load_from_file_store_async_xmlhttp(name,handler);return true;}}
catch(e)
{}
return false;}
function read_local_file(name)
{if(name.match(/[^a-zA-Z0-9_\.]/)||name.match(/^\./))
{alert("Invalid filename - must only contain alphanumerics, '_' and '.'; and must not start with '.'");return null;}
try
{netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');var file=Components.classes['@mozilla.org/file/directory_service;1'].getService(Components.interfaces.nsIProperties).get('Home',Components.interfaces.nsIFile);file.append('.canvex');file.append(name);var fstream=Components.classes["@mozilla.org/network/file-input-stream;1"].createInstance(Components.interfaces.nsIFileInputStream);var istream=Components.classes["@mozilla.org/intl/converter-input-stream;1"].createInstance(Components.interfaces.nsIConverterInputStream);const replacementChar=Components.interfaces.nsIConverterInputStream.DEFAULT_REPLACEMENT_CHARACTER;fstream.init(file,-1,0,0);istream.init(fstream,"UTF-8",1024,replacementChar);var str={};var contents='';while(istream.readString(4096,str)!==0)
{contents+=str.value;}
istream.close();fstream.close();return parseJSON(contents);}
catch(e)
{if(e.name=='NS_ERROR_FILE_NOT_FOUND')
{alert('Cannot find file named "'+name+'"');}
else
{alert('Unexpected error: '+e);}
return null;}}
function write_local_file(name,contents)
{if(name.match(/[^a-zA-Z0-9_\.]/)||name.match(/^\./))
{alert("Invalid filename - must only contain alphanumerics, '_' and '.'; and must not start with '.'");return false;}
try
{var json=toJSONString(contents);netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');var file=Components.classes['@mozilla.org/file/directory_service;1'].getService(Components.interfaces.nsIProperties).get('Home',Components.interfaces.nsIFile);file.append('.canvex');if(!file.exists())
{file.create(Components.interfaces.nsIFile.DIRECTORY_TYPE,436);}
file.append(name);var fstream=Components.classes["@mozilla.org/network/file-output-stream;1"].createInstance(Components.interfaces.nsIFileOutputStream);var ostream=Components.classes["@mozilla.org/intl/converter-output-stream;1"].createInstance(Components.interfaces.nsIConverterOutputStream);fstream.init(file,0x02|0x08|0x20,436,0);ostream.init(fstream,"UTF-8",1024,0x0000);ostream.writeString(json);ostream.close();fstream.close();return true;}
catch(e)
{alert('Unexpected error: '+e);return false;}}
var profiler_enabled;var profile_timers={};var profile_counters={};var profile_samples=32;var profile_sampled=0;function profile_begin(name)
{if(profiler_enabled)
{var t=new Date();var ms=t.getMilliseconds()+1000*(t.getSeconds()+60*t.getMinutes());profile_timers[name]=(profile_timers[name]===undefined?0:profile_timers[name])-ms;}}
function profile_count(name)
{if(profiler_enabled)
{profile_counters[name]=(profile_counters[name]===undefined?1:profile_counters[name]+1);}}
function profile_end(name)
{if(profiler_enabled)
{var t=new Date();var ms=t.getMilliseconds()+1000*(t.getSeconds()+60*t.getMinutes());profile_timers[name]+=ms;}}
function profile_report()
{if(!profiler_enabled)
{return;}
if(++profile_sampled<profile_samples)
{return;}
profile_sampled=0;var s="";for(var n in profile_timers)
{s+=n+": "+profile_timers[n]/profile_samples+" ms/frame<br/>";}
for(var n in profile_counters)
{s+=n+": "+profile_counters[n]/profile_samples+" /frame<br/>";}
$('profile').innerHTML=s;profile_timers={};profile_counters={};}
var framerate_buffer=[];var framerate_previous_date;const framerate_buffer_max=32;var framerate_last_update;const framerate_update_time=1000;function framerate_update()
{var now=new Date();if(!framerate_previous_date)
{framerate_previous_date=now;framerate_last_update=now;return;}
var length=now-framerate_previous_date;framerate_previous_date=now;framerate_buffer.push(length);while(framerate_buffer.length>framerate_buffer_max)
{framerate_buffer.shift();}
if(now-framerate_last_update>framerate_update_time)
{framerate_last_update=now;var t=0;for(var i=0;i<framerate_buffer.length;++i){t+=framerate_buffer[i];}
var fps=Math.round(10*1000*framerate_buffer.length/t)/10;$('framerate').innerHTML=fps;if(this.ui)
{ui.set_counter(Math.round(fps));}
var fpsgraph=$('fpsgraph');if(fpsgraph)
{var fpsgraph_doc=$('fpsgraph').contentDocument;if(fpsgraph_doc&&fpsgraph_doc.fpsgraph_add_profile_sample)
{fpsgraph_doc.fpsgraph_add_profile_sample(fps);}}}}
function ray_vs_line(ray_x,ray_y,ray_dx,ray_dy,line_x0,line_y0,line_x1,line_y1)
{var abx=line_x0-line_x1;var aby=line_y0-line_y1;var acx=line_x0-ray_x;var acy=line_y0-ray_y;var t=(acx*ray_dy-acy*ray_dx)/(abx*ray_dy-aby*ray_dx);return t;}
function line_vs_line(line0_x0,line0_y0,line0_x1,line0_y1,line1_x0,line1_y0,line1_x1,line1_y1)
{var x_00_10=line0_x0-line1_x0;var y_00_10=line0_y0-line1_y0;var x_11_10=line1_x1-line1_x0;var y_11_10=line1_y1-line1_y0;var x_01_10=line0_x1-line1_x0;var y_01_10=line0_y1-line1_y0;var x_11_00=line1_x1-line0_x0;var y_11_00=line1_y1-line0_y0;var x_00_01=line0_x0-line0_x1;var y_00_01=line0_y0-line0_y1;if((x_00_10*y_11_10-y_00_10*x_11_10)*(x_01_10*y_11_10-y_01_10*x_11_10)<=0&&(x_00_10*y_00_01-y_00_10*x_00_01)*(x_11_00*y_00_01-y_11_00*x_00_01)>=0)
{return true;}
else
{return false;}}
function line_depth(ray_x,ray_y,ray_dx,ray_dy,line_x0,line_y0,line_x1,line_y1,t)
{var abx=line_x0-line_x1;var aby=line_y0-line_y1;var acx=line_x0-ray_x;var acy=line_y0-ray_y;var dist=(acx-t*abx)*ray_dx+(acy-t*aby)*ray_dy;return dist;}
function point_depth(x0,y0,dx,dy,x1,y1)
{return(x1-x0)*dx+(y1-y0)*dy;}
function point_distance(x0,y0,x1,y1)
{return Math.sqrt((x0-x1)*(x0-x1)+(y0-y1)*(y0-y1));}
function line_distance(ray_x,ray_y,line_x0,line_y0,line_x1,line_y1,t)
{var dx=line_x0+t*(line_x1-line_x0)-ray_x;var dy=line_y0+t*(line_y1-line_y0)-ray_y;return Math.sqrt(dx*dx+dy*dy);}
function ray_line_distance(ray_x,ray_y,ray_dx,ray_dy,line_x0,line_y0,line_x1,line_y1)
{var abx=line_x0-line_x1;var aby=line_y0-line_y1;var acx=line_x0-ray_x;var acy=line_y0-ray_y;var t=(acx*ray_dy-acy*ray_dx)/(abx*ray_dy-aby*ray_dx);if(t<0||t>=1)
{return Infinity;}
return((acx-t*abx)*ray_dx+(acy-t*aby)*ray_dy);}
function point_line_distance_rect(x,y,x0,y0,x1,y1)
{var len=point_distance(x0,y0,x1,y1);var xn=(x1-x0)/len;var yn=(y1-y0)/len;var dist_perp=Math.abs((x-x0)*yn-(y-y0)*xn);var dist_para=Math.abs((x-x0)*xn+(y-y0)*yn-len/2)-len/2;return(dist_perp>dist_para?dist_perp:dist_para);}
function point_line_distance_circle(x,y,x0,y0,x1,y1)
{var len=point_distance(x0,y0,x1,y1);var xn=(x1-x0)/len;var yn=(y1-y0)/len;var pos_para=(x-x0)*xn+(y-y0)*yn;if(pos_para<0)
{return point_distance(x,y,x0,y0);}
else if(pos_para>len)
{return point_distance(x,y,x1,y1);}
else
{return Math.abs((x-x0)*yn-(y-y0)*xn);}}
function point_line_distance_perp(x,y,x0,y0,x1,y1)
{var len=point_distance(x0,y0,x1,y1);var xn=(x1-x0)/len;var yn=(y1-y0)/len;var pos_para=(x-x0)*xn+(y-y0)*yn;if(pos_para<0||pos_para>len)
{return Infinity;}
return Math.abs((x-x0)*yn-(y-y0)*xn);}
function point_is_in_polygon(x,y,sector)
{var isctns=0;for(var e=0;e<sector.edges.length;++e)
{var edge=sector.edges[e];var t=ray_vs_line(x,y,1,0,edge.x0,edge.y0,edge.x1,edge.y1);if(t>=0&&t<1)
{var depth=line_depth(x,y,1,0,edge.x0,edge.y0,edge.x1,edge.y1,t);if(depth>0)
{++isctns;}}}
return(isctns%2?true:false);}
function polygon_centre(sector)
{var xs=0,ys=0;for(var e=0;e<sector.edges.length;++e)
{var edge=sector.edges[e];xs+=edge.x0;ys+=edge.y0;}
return{x:xs/sector.edges.length,y:ys/sector.edges.length};}
var sectors;var sprites;const mipmap_bias=-0.5;const near_clip=0.01;function draw_texture_strip(ctx,tex,u0,sy,u1,sh,dx,dy,dw,dh)
{while(u1>=texture_u_repeat)
{var d=Math.floor(dw*(1-u0)/(u1-u0));ctx.drawImage(tex.img,tex.w*u0,tex.h*sy,tex.w*(1-u0),tex.h*sh,dx,dy,d,dh);dx+=d;dw-=d;u0=0;u1-=1;}
ctx.drawImage(tex.img,tex.w*u0,tex.h*sy,tex.w*(u1-u0),tex.h*sh,dx,dy,dw,dh);}
function get_mip(tex,s)
{var miplevel=Math.ceil(mipmap_bias+Math.log(s)/Math.LN2);if(miplevel<mipmap_min)
{miplevel=mipmap_min;}
else if(miplevel>=tex.length)
{miplevel=tex.length-1;}
else if(isNaN(miplevel))
{miplevel=mipmap_min;}
return tex[miplevel];}
function get_mip_level(tex,s)
{var miplevel=Math.ceil(mipmap_bias+Math.log(s)/Math.LN2);if(miplevel<mipmap_min)
{miplevel=mipmap_min;}
else if(miplevel>=tex.length)
{miplevel=tex.length-1;}
else if(isNaN(miplevel))
{miplevel=mipmap_min;}
return miplevel;}
function draw_texture(ctx,h,clip_y0,clip_y1,tex,sx,sy,sw,sh,dx,dy,dw,dh)
{var miptex;if(sw<1e-6){return;}
if(options_flags.draw_pattern_walls)
{miptex=get_mip(tex,dw/sw);try{ctx.save();ctx.fillStyle=miptex.img;ctx.scale(dw/(sw*miptex.w),dh/(sh*miptex.h));ctx.translate((dx*sw/dw-sx)*miptex.w,(dy*sh/dh-sy)*miptex.h);ctx.fillRect(sx*miptex.w,sy*miptex.h,sw*miptex.w,sh*miptex.w);ctx.restore();}catch(e){debug(e);}}
else
{var u0=(sx<0?1+sx%1:sx%1);var v0=(sy<0?1+sy%1:sy%1);var v1=v0+sh;while(v1>=texture_v_repeat)
{var d=Math.floor(dh*(1-v0)/(v1-v0));if(dy<clip_y1&&dy+d>=clip_y0&&d>0)
{if(!miptex){miptex=get_mip(tex,dw/sw);}
draw_texture_strip(ctx,miptex,u0,v0,u0+sw,1-v0,dx,dy,dw,d);}
dy+=d;dh-=d;v0=0;v1-=1;}
if(dy<clip_y1&&dy+dh>=clip_y0&&dh>0)
{if(!miptex){miptex=get_mip(tex,dw/sw);}
draw_texture_strip(ctx,miptex,u0,v0,u0+sw,v1-v0,dx,dy,dw,dh);}}}
function sprite_sort(a,b)
{return(a.w>b.w?-1:a.w<b.w?1:0);}
function render_sprites(ctx,camera,sector,x0,x1,w,h)
{var sorted_sprites=[];for(var s in sector.sprites)
{var sprite=sprites[s];var depth=point_depth(camera.x,camera.y,camera.dx,camera.dy,sprite.x,sprite.y);if(depth>0)
{sorted_sprites.push({sprite:sprite,w:depth});}}
sorted_sprites.sort(sprite_sort);ctx.beginPath();for(var s=0;s<sorted_sprites.length;++s)
{var sprite=sorted_sprites[s].sprite;var depth=sorted_sprites[s].w;var numframes=sprite.spritedef.sprite.frames;var numangles=sprite.spritedef.sprite.angles;var frame=Math.floor(camera.t*1000/sprite.spritedef.sprite.speed)%numframes;var angle=Math.PI+sprite.a-Math.atan2(sprite.y-camera.y,sprite.x-camera.x);angle=(numangles+Math.round(angle*numangles/(2*Math.PI)))%numangles;var tex=sprite.spritedef.images[frame+angle*numframes];var x=w*(0.5+uncast_ray(sprite.x,sprite.y,camera));var height=h*(sprite.spritedef.sprite.height/depth);var width=height*tex.w/tex.h;var clipped_x0=x-width/2;var clipped_x1=x+width/2;if(clipped_x0<x1&&clipped_x1>x0)
{var zbase=h*(0.5-(-camera.z+sprite.z)/depth);var u0=0,u1=1;if(clipped_x0<x0)
{u0=(x0-clipped_x0)/width;clipped_x0=x0;}
if(clipped_x1>x1)
{u1=1-(clipped_x1-x1)/width;clipped_x1=x1;}
ctx.drawImage(tex.img,u0*tex.w,0,(u1-u0)*(tex.w-0.01),tex.h,clipped_x0,zbase-height,clipped_x1-clipped_x0,height);}}}
function render(w,h,ctx,dctx,camera)
{var dh=Math.floor(camera.dh*h);if(dh!==0)
{ctx.save();ctx.translate(0,dh);}
render_rays(0,w,-dh,h-dh,camera.s,w,h,ctx,dctx,camera,0);if(dh!==0)
{ctx.restore();}}
function max_abs(x,y)
{x=Math.abs(x);y=Math.abs(y);return x>y?x:y;}
function draw_poly(ctx,h,tex,x,edge_end,clip_y0,clip_y1,bot0,top0,bot1,top1,w0,w1,u0,u1,v0,v1,floor,ceiling,lighting,solid)
{if(w0<near_clip||w1<near_clip)
{return;}
ctx.beginPath();u0=u0*tex.uscale+tex.u;u1=u1*tex.uscale+tex.u;v0=v0*tex.vscale+tex.v;v1=v1*tex.vscale+tex.v;var u0w=u0/w0;var u1w=u1/w1;var dtop=(top1-top0)/(edge_end-x);var dbot=(bot1-bot0)/(edge_end-x);var dt=1/(edge_end-x);var t=0;var top=top0;var bot=bot0;var xp=x;var max_dy=2;var min_dx=8;var max_dx=Infinity;var dy=max_abs(dtop,dbot);var dx=Math.floor(max_dy/dy);if(dx<min_dx){dx=min_dx;}
if(dx>max_dx){dx=max_dx;}
if(dtop>0){top+=dtop*dx;}
if(dbot<0){bot+=dbot*dx;}
var alpha_texture=!(solid&&!options_flags.no_alpha_texture);if(!alpha_texture&&lighting<1)
{ctx.globalAlpha=lighting;}
if(!solid)
{ctx.beginPath();ctx.rect(0,0,0,0);ctx.stroke();ctx.save();ctx.beginPath();ctx.moveTo(x,bot0);ctx.lineTo(edge_end,bot1);ctx.lineTo(edge_end,top1);ctx.lineTo(x,top0);ctx.clip();}
var u=u0;while(xp<edge_end)
{profile_count("draw strip");if(xp+dx>edge_end){dx=edge_end-xp;}
t+=dx*dt;if(top>=clip_y0&&bot<clip_y1)
{if(v1>v0)
{var topi=Math.floor(top);var boti=Math.floor(bot);var ul=u;u=((1-t)*u0w+t*u1w)/((1-t)/w0+t/w1);draw_texture(ctx,h,clip_y0,clip_y1,tex.tex,ul,v0,u-ul,v1-v0,xp,boti,dx,topi-boti+1);if(alpha_texture&&lighting<1)
{ctx.fillStyle='#000000';ctx.globalAlpha=1-lighting;ctx.fillRect(xp,boti,dx,topi-boti+1);ctx.globalAlpha=1;}}}
xp+=dx;top+=dx*dtop;bot+=dx*dbot;}
if(!solid)
{ctx.restore();}
if(!alpha_texture&&lighting<1)
{ctx.globalAlpha=1;}
if(floor&&(top0<clip_y1||top1<clip_y1))
{if(!options_flags.textured_floors)
{ctx.fillStyle=floor;ctx.beginPath();ctx.moveTo(x,clip_y1);ctx.lineTo(x,top0);ctx.lineTo(edge_end,top1);ctx.lineTo(edge_end,clip_y1);ctx.fill();}}
if(ceiling&&(bot0>=clip_y0||bot1>=clip_y0))
{ctx.fillStyle=ceiling;ctx.beginPath();ctx.moveTo(x,clip_y0-1);ctx.lineTo(x,bot0);ctx.lineTo(edge_end,bot1);ctx.lineTo(edge_end,clip_y0-1);ctx.fill();}}
function draw_floor(dctx,ctx,h,w,camera,isctn0,isctn1,sector,clip_y,x0,x1,y0,y1)
{const step=2;const r=2*32;var z=sector.floor_height-camera.z;ctx.beginPath();ctx.rect(0,0,0,0);ctx.stroke();ctx.save();ctx.beginPath();ctx.moveTo(x0,y0);ctx.lineTo(x1,y1);ctx.lineTo(x1,clip_y);ctx.lineTo(x0,clip_y);ctx.closePath();ctx.clip();for(var screeny=Math.floor(Math.min(y0,y1));screeny<clip_y;screeny+=step)
{var d=z/(0.5-screeny/h);var c0=ray_coords(d,x0/w-0.5,camera);var c1=ray_coords(d,x1/w-0.5,camera);var s_over_uv=(x1-x0)/(r*point_distance(c0.x,c0.y,c1.x,c1.y));var angle=Math.atan2(c0.y-c1.y,c0.x-c1.x);var cos_scaled=Math.cos(angle)/s_over_uv;var sin_scaled=Math.sin(angle)/s_over_uv;var tx=(cos_scaled*x0-sin_scaled*screeny)+c0.x*r;var ty=(sin_scaled*x0+cos_scaled*screeny)+c0.y*r;var y0b=screeny;var y1b=screeny+step;var x0b=x0;var x0c=x0;var x1b=x1;var x1c=x1;var mip=get_mip_level(sector.floor,s_over_uv/48);var s=128/Math.pow(2,mip);ctx.fillStyle=sector.floor[mip].img;ctx.save();ctx.scale(s_over_uv*s,s_over_uv*s);ctx.rotate(-angle);ctx.translate(tx/s,ty/s);ctx.beginPath();ctx.moveTo((x0c*cos_scaled-y1b*sin_scaled-tx)/s,(x0c*sin_scaled+y1b*cos_scaled-ty)/s);ctx.lineTo((x0b*cos_scaled-y0b*sin_scaled-tx)/s,(x0b*sin_scaled+y0b*cos_scaled-ty)/s);ctx.lineTo((x1b*cos_scaled-y0b*sin_scaled-tx)/s,(x1b*sin_scaled+y0b*cos_scaled-ty)/s);ctx.lineTo((x1c*cos_scaled-y1b*sin_scaled-tx)/s,(x1c*sin_scaled+y1b*cos_scaled-ty)/s);ctx.fill();ctx.restore();}
ctx.restore();}
function render_rays(x0,x1,y0,y1,sector,w,h,ctx,dctx,camera,limit)
{var x=x0;var isctn0=cast_ray(sector,x/w-0.5,camera);while(x<x1)
{profile_count("cast strip");if(dctx)
{var px=x/w-0.5;dctx.strokeStyle='#ff0000';dctx.beginPath();dctx.moveTo(camera.x,camera.y);dctx.lineTo(camera.x+camera.dx-px*camera.dy,camera.y+camera.dy+px*camera.dx);dctx.stroke();}
var edge=isctn0.edge;if(!edge)
{ctx.fillStyle='#000000';ctx.fillRect(x,0,1,h);++x;isctn0=cast_ray(sector,x/w-0.5,camera);}
else
{if(dctx)
{dctx.strokeStyle='#0000ff';dctx.beginPath();dctx.moveTo(camera.x,camera.y);dctx.lineTo(edge.x1,edge.y1);dctx.stroke();}
var edge_end=Math.floor(1+w*(0.5+uncast_ray(edge.x1,edge.y1,camera)));var isctn1;if(edge_end>x1)
{edge_end=x1;isctn1=cast_ray_edge(edge,x1/w-0.5,camera);}
else
{isctn1={dist:point_depth(camera.x,camera.y,camera.dx,camera.dy,edge.x1,edge.y1),u:edge.len};}
if(edge.dest===null)
{var bottom0=h*(0.5-(-camera.z+sector.ceiling_height)/isctn0.dist);var top0=h*(0.5-(-camera.z+sector.floor_height)/isctn0.dist);var bottom1=h*(0.5-(-camera.z+sector.ceiling_height)/isctn1.dist);var top1=h*(0.5-(-camera.z+sector.floor_height)/isctn1.dist);var w0=isctn0.dist;var w1=isctn1.dist;var u0=isctn0.u;var u1=isctn1.u;var v0=-sector.ceiling_height;var v1=-sector.floor_height;draw_poly(ctx,h,edge.lower,x,edge_end,y0,y1,bottom0,top0,bottom1,top1,w0,w1,u0,u1,v0,v1,sector.floor,sector.ceiling,sector.light,true);if(options_flags.textured_floors)
{draw_floor(dctx,ctx,h,w,camera,isctn0,isctn1,sector,y1,x,edge_end,top0,top1);}}
else
{var bottom0=h*(0.5-(-camera.z+Math.max(sector.floor_height,edge.dest.floor_height))/isctn0.dist);var top0=h*(0.5-(-camera.z+Math.min(sector.ceiling_height,edge.dest.ceiling_height))/isctn0.dist);var bottom1=h*(0.5-(-camera.z+Math.max(sector.floor_height,edge.dest.floor_height))/isctn1.dist);var top1=h*(0.5-(-camera.z+Math.min(sector.ceiling_height,edge.dest.ceiling_height))/isctn1.dist);var y0r=Math.min(top0,top1);var y1r=Math.max(bottom0+1,bottom1+1);if(y0r<=y1r&&y1r>=y0&&y0r<y1)
{render_rays(x,edge_end,Math.max(y0,y0r),Math.min(y1,y1r),edge.dest,w,h,ctx,dctx,camera,limit);}
var w0=isctn0.dist;var w1=isctn1.dist;var u0=isctn0.u;var u1=isctn1.u;if(edge.middle.tex)
{var v0=-sector.ceiling_height;var v1=-sector.floor_height;var bottom0=h*(0.5-(-camera.z+sector.ceiling_height)/isctn0.dist);var top0=h*(0.5-(-camera.z+sector.floor_height)/isctn0.dist);var bottom1=h*(0.5-(-camera.z+sector.ceiling_height)/isctn1.dist);var top1=h*(0.5-(-camera.z+sector.floor_height)/isctn1.dist);draw_poly(ctx,h,edge.middle,x,edge_end,y0,y1,bottom0,top0,bottom1,top1,w0,w1,u0,u1,v0,v1,null,null,sector.light,false);}
var bottom0=h*(0.5-(-camera.z+edge.dest.floor_height)/isctn0.dist);var top0=h*(0.5-(-camera.z+sector.floor_height)/isctn0.dist);var bottom1=h*(0.5-(-camera.z+edge.dest.floor_height)/isctn1.dist);var top1=h*(0.5-(-camera.z+sector.floor_height)/isctn1.dist);var v1=-sector.floor_height;var v0=-edge.dest.floor_height;draw_poly(ctx,h,edge.lower,x,edge_end,y0,y1,bottom0,top0,bottom1,top1,w0,w1,u0,u1,v0,v1,sector.floor,null,sector.light,false);if(options_flags.textured_floors)
{draw_floor(dctx,ctx,h,w,camera,isctn0,isctn1,sector,y1,x,edge_end,top0,top1);}
var bottom0=h*(0.5-(-camera.z+sector.ceiling_height)/isctn0.dist);var top0=h*(0.5-(-camera.z+edge.dest.ceiling_height)/isctn0.dist);var bottom1=h*(0.5-(-camera.z+sector.ceiling_height)/isctn1.dist);var top1=h*(0.5-(-camera.z+edge.dest.ceiling_height)/isctn1.dist);var v1=-edge.dest.ceiling_height;var v0=-sector.ceiling_height;draw_poly(ctx,h,edge.upper,x,edge_end,y0,y1,bottom0,top0,bottom1,top1,w0,w1,u0,u1,v0,v1,null,sector.ceiling,sector.light,false);}
if(edge_end>x)
{x=edge_end;if(x<x1)
{isctn0=cast_ray(sector,x/w-0.5,camera);}}
else
{++x;if(x<x1)
{isctn0={edge:edge.next,dist:point_depth(camera.x,camera.y,camera.dx,camera.dy,edge.next.x0,edge.next.y0),u:0};}}}}
ctx.beginPath();ctx.rect(0,0,0,0);ctx.stroke();render_sprites(ctx,camera,sector,x0,x1,w,h);}
function uncast_ray(x,y,camera)
{x-=camera.x;y-=camera.y;var y2=x*camera.dx+y*camera.dy;if(y2<=0){return Infinity;}
var x2=x*camera.dy-y*camera.dx;return-x2/y2;}
function cast_ray(sector,px,camera)
{var ray_dx=camera.dx-camera.dy*px;var ray_dy=camera.dy+camera.dx*px;var mag=Math.sqrt(ray_dx*ray_dx+ray_dy*ray_dy);ray_dx/=mag;ray_dy/=mag;var ray_x=camera.x;var ray_y=camera.y;var closest_edge=null,closest_t,closest_dist2;var closest_dist=Infinity;for(var e=0;e<sector.edges.length;++e)
{var edge=sector.edges[e];var t=ray_vs_line(ray_x,ray_y,ray_dx,ray_dy,edge.x0,edge.y0,edge.x1,edge.y1);if(t>=0&&t<1)
{var side=(camera.x-edge.x0)*(edge.y1-edge.y0)-(camera.y-edge.y0)*(edge.x1-edge.x0);if(side<0)
{var dist=line_depth(camera.x,camera.y,camera.dx,camera.dy,edge.x0,edge.y0,edge.x1,edge.y1,t);if(dist>0&&dist<closest_dist)
{closest_edge=edge;closest_t=t;closest_dist=dist;}}}}
if(closest_edge)
{var u=closest_t*closest_edge.len;}
return{edge:closest_edge,dist:closest_dist,u:u};}
function cast_ray_edge(edge,px,camera)
{var ray_dx=camera.dx-camera.dy*px;var ray_dy=camera.dy+camera.dx*px;var mag=Math.sqrt(ray_dx*ray_dx+ray_dy*ray_dy);ray_dx/=mag;ray_dy/=mag;var ray_x=camera.x;var ray_y=camera.y;var t=ray_vs_line(ray_x,ray_y,ray_dx,ray_dy,edge.x0,edge.y0,edge.x1,edge.y1);var dist=line_depth(camera.x,camera.y,camera.dx,camera.dy,edge.x0,edge.y0,edge.x1,edge.y1,t);var u=t*edge.len;return{edge:edge,dist:dist,u:u};}
function ray_coords(depth,px,camera)
{var ray_dx=camera.dx-camera.dy*px;var ray_dy=camera.dy+camera.dx*px;depth/=camera.dx*ray_dx+camera.dy*ray_dy;return{x:camera.x+depth*ray_dx,y:camera.y+depth*ray_dy};}
function render_frame(ctx,dctx,gctx,w,h,camera)
{ctx.globalAlpha=1;ctx.fillStyle='#000000';ctx.fillRect(0,0,w,h);profile_begin('render');render(w,h,ctx,dctx,camera);profile_end('render');if(gctx)
{if(!options_flags.opera_hack)
{gctx.lockCanvasUpdates(false);gctx.updateCanvas();gctx.lockCanvasUpdates(true);}
else
{$('c').style.width=($('c').style.width=='640px'?'639px':'640px');}}}
var paused_img;function render_paused(ctx,w,h)
{if(!paused_img)
{paused_img=new Image();paused_img.src='textures/misc/paused.png';}
if(!paused_img.complete)
{setTimeout(render_paused,100,ctx,w,h);return;}
var dw=w*0.8;var dh=dw*(paused_img.height/paused_img.width);ctx.globalAlpha=0.3;ctx.fillStyle='#000000';ctx.fillRect(0,0,w,h);ctx.globalAlpha=1;ctx.drawImage(paused_img,(w-dw)/2,(h-dh)/2,dw,dh);}
var level;var player={x:-1,y:0,z:0.5,dx:Math.cos(0),dy:Math.sin(0),dh:0,vz:0,sector_id:0,s:undefined,radius:0.2,height:0.5,eyeline:0.4,maxstep:0.15};var map_scale=22;var map_shift_x=0;var map_shift_y=0;var 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ui_enabled=true;(function(){var ui_doc;function init()
{}
function find_ui_doc()
{if(!ui_doc)
{var ui=$('uibottom');if(ui)
{ui_doc=ui.contentDocument;}}}
function set_counter(value)
{try
{find_ui_doc();if(ui_doc)
{ui_doc.getElementById('counter_0').setAttribute('transform','translate(0, '+(-80*Math.floor(value/10))+')');ui_doc.getElementById('counter_1').setAttribute('transform','translate(0, '+(-80*Math.floor(value%10))+')');ui_doc.documentElement.forceRedraw();}}
catch(e)
{}}
this.ui={init:init,set_counter:set_counter};})();(function(){const max_vertical_look=0.8;var editor_enabled=this.editor_enabled;var ui_enabled=this.ui_enabled;var fpsgraph_enabled=false;var camera={x:0,y:0,z:0,dx:0,dy:0,dh:0,s:null,t:0};var textures={wall:{},sprite:{}};var loading_textures=[];var default_texture={img:new Image(),w:32,h:32};var error_texture={img:new Image(),w:32,h:32};default_texture.img.src='data:image/png;base64,'+texture_data.loading;error_texture.img.src='data:image/png;base64,'+texture_data.error;var level_data={};function load_texture(type,name)
{if(!name)
{return undefined;}
if(!textures.wall[name])
{var texture_dir='textures/tiled/'+((options_flags.draw_pattern_walls||type=='floor')?'mip2/':'mip/');textures.wall[name]=[];if(mipmap_enabled)
{for(var i=mipmap_min;i<=mipmap_max;++i)
{var image=new Image();image.src=texture_dir+name+'.'+i+'.png';textures.wall[name][i]={img:default_texture.img,w:default_texture.w,h:default_texture.h};loading_textures.push({type:type,obj:textures.wall[name][i],img:image});}}
else
{var image=new Image();image.src=texture_dir+name+'.'+mipmap_max+'.png';textures.wall[name][mipmap_min]={img:default_texture.img,w:default_texture.w,h:default_texture.h};loading_textures.push({type:type,obj:textures.wall[name][mipmap_min],img:image});}}
return textures.wall[name];}
function load_sprite(name)
{if(!textures.sprite[name])
{if(!spritedefs[name])
{return null;}
textures.sprite[name]={sprite:spritedefs[name],images:[]};var i=0;for(var a=0;a<spritedefs[name].angles;++a)
{for(var f=0;f<spritedefs[name].frames;++f)
{textures.sprite[name].images.push({img:default_texture.img,w:default_texture.w,h:default_texture.h});var image=new Image();image.src='textures/sprites/'+spritedefs[name].img+'.'+a+'.'+f+'.png';loading_textures.push({type:'sprite',obj:textures.sprite[name].images[i],img:image});++i;}}}
return textures.sprite[name];}
function flush_textures()
{textures={wall:{},sprite:{}};loading_textures=[];}
function process_pending_textures(ctx)
{for(var t in loading_textures)
{var tex=loading_textures[t];if(tex.img.complete)
{if(tex.img.width)
{if(options_flags.draw_pattern_walls&&tex.type=='wall')
{tex.obj.img=ctx.createPattern(tex.img,'repeat');tex.obj.w=tex.img.width;tex.obj.h=tex.img.height;}
else
{if(tex.type=='floor')
{tex.obj.img=ctx.createPattern(tex.img,'repeat');}
else if(options_flags.draw_from_canvas)
{var canvas=document.createElementNS('http://www.w3.org/1999/xhtml','canvas');canvas.width=tex.img.width;canvas.height=tex.img.height;canvas.getContext('2d').drawImage(tex.img,0,0);tex.obj.img=canvas;}
else
{tex.obj.img=tex.img;}
if(tex.type=='wall')
{tex.obj.w=tex.img.width/texture_u_repeat;tex.obj.h=tex.img.height/texture_v_repeat;}
else
{tex.obj.w=tex.img.width;tex.obj.h=tex.img.height;}}}
else
{tex.obj.img=error_texture.img;tex.obj.w=error_texture.w;tex.obj.h=error_texture.h;}
delete loading_textures[t];}}}
function array_to_rgba(c)
{return'rgba('+c[0]+','+c[1]+','+c[2]+',1)';}
function colour_interpolate(c0,c1,n)
{var m=1-n;return[Math.floor(c0[0]*m+c1[0]*n),Math.floor(c0[1]*m+c1[1]*n),Math.floor(c0[2]*m+c1[2]*n)];}
function scripted_vertical_door(sector)
{var attached_edges=[];for(var e=0;e<sector.edges.length;++e)
{if(sector.edges[e].dest)
{var edges2=sector.edges[e].dest.edges;for(var e2=0;e2<edges2.length;++e2)
{if(edges2[e2].dest===sector)
{attached_edges.push(edges2[e2]);}}}}
return function(dt,dist)
{var speed=0.3;var h;if(dist<2)
{h=Math.min(1,sector.ceiling_height+speed*dt);}
else
{h=Math.max(0,sector.ceiling_height-speed*dt);}
if(h!=sector.ceiling_height)
{for(var e=0;e<attached_edges.length;++e)
{attached_edges[e].upper.v=h*attached_edges[e].upper.vscale;}
sector.ceiling_height=h;}};}
function preprocess_map(ctx,h)
{if(player.s)
{player.sector_id=player.s.id;}
sectors=[];level_data.proximity_triggers=[];for(var s=0;s<level.sectors.length;++s)
{var sector=level.sectors[s];var new_sector={id:s,floor_height:sector.floor_height,ceiling_height:sector.ceiling_height,light:sector.light,sector_id:s,sprites:{}};if(options_flags.gradient_surfaces)
{var gradient;var dh=h*max_vertical_look;var stop0=dh/(h+2*dh);var stop1=(dh+h)/(h+2*dh);if(!options_flags.textured_floors)
{gradient=ctx.createLinearGradient(0,-dh,0,h+dh);var c=colour_interpolate([0,0,0],sector.floor,sector.light);var c0=array_to_rgba(colour_interpolate(c,[255,255,255],0.3));var c1=array_to_rgba(c);gradient.addColorStop(1,c0);gradient.addColorStop(stop1,c0);gradient.addColorStop(0.5,c1);gradient.addColorStop(stop0,c1);gradient.addColorStop(0,c1);new_sector.floor=gradient;}
else
{new_sector.floor=load_texture('floor','testfloor');}
gradient=ctx.createLinearGradient(0,-dh,0,h+dh);c=colour_interpolate([0,0,0],sector.ceiling,sector.light);c0=array_to_rgba(colour_interpolate(c,[0,0,0],0.3));c1=array_to_rgba(c);gradient.addColorStop(0,c0);gradient.addColorStop(stop0,c0);gradient.addColorStop(0.5,c1);gradient.addColorStop(stop1,c1);gradient.addColorStop(1,c1);new_sector.ceiling=gradient;}
else
{c=colour_interpolate([0,0,0],sector.floor,sector.light);new_sector.floor=array_to_rgba(colour_interpolate(c,[255,255,255],0.3/2));c=colour_interpolate([0,0,0],sector.ceiling,sector.light);new_sector.ceiling=array_to_rgba(colour_interpolate(c,[0,0,0],0.3/2));}
new_sector.edges=[];for(var e=0;e<sector.edges.length;++e)
{var edge=sector.edges[e];var new_edge={x0:edge.x0,y0:edge.y0,x1:edge.x1,y1:edge.y1,dest:edge.dest,dbg:edge.dbg};new_edge.len=point_distance(new_edge.x0,new_edge.y0,new_edge.x1,new_edge.y1);new_edge.lower={u:edge.tex.l.u,v:edge.tex.l.v,uscale:1/edge.tex.l.us,vscale:1/edge.tex.l.vs,tex:load_texture('wall',edge.tex.l.n)};new_edge.middle={u:edge.tex.m.u,v:edge.tex.m.v,uscale:1/edge.tex.m.us,vscale:1/edge.tex.m.vs,tex:load_texture('wall',edge.tex.m.n)};new_edge.upper={u:edge.tex.u.u,v:edge.tex.u.v,uscale:1/edge.tex.u.us,vscale:1/edge.tex.u.vs,tex:load_texture('wall',edge.tex.u.n||edge.tex.l.n)};new_sector.edges.push(new_edge);}
for(e=0;e<new_sector.edges.length;++e)
{new_sector.edges[e].next=new_sector.edges[(new_sector.edges.length+e-1)%new_sector.edges.length];}
sectors.push(new_sector);}
for(var s=0;s<sectors.length;++s)
{for(var e=0;e<sectors[s].edges.length;++e)
{var edge=sectors[s].edges[e];edge.dest=(edge.dest===0?null:sectors[edge.dest-1]);}}
player.s=sectors[player.sector_id];for(var s=0;s<level.sectors.length;++s)
{if(level.sectors[s].tags)
{for(var t=0;t<level.sectors[s].tags.length;++t)
{var tag=level.sectors[s].tags[t];if(tag.type=='vertical door')
{var c=polygon_centre(sectors[s]);level_data.proximity_triggers.push({x:c.x,y:c.y,fn:scripted_vertical_door(sectors[s])});}
else
{alert('invalid sector tag "'+tag.type+'"');}}}}
sprites=[];for(var s=0;s<level.sprites.length;++s)
{var new_sprite={x:level.sprites[s].x,y:level.sprites[s].y,a:level.sprites[s].a};new_sprite.spritedef=load_sprite(level.sprites[s].sprite);new_sprite.sector=sectors[level.sprites[s].sector];new_sprite.z=level.sprites[s].z+new_sprite.sector.floor_height;var r=new_sprite.spritedef.sprite.radius;var nearby_sectors=find_nearby_sectors(new_sprite.x,new_sprite.y,new_sprite.sector,r);for(var i=0;i<nearby_sectors.length;++i)
{nearby_sectors[i].sprites[s]=1;}
sprites.push(new_sprite);}}
function find_nearby_sectors_(x,y,sector,d,found)
{if(found[sector.id])
{return;}
found[sector.id]=true;for(var e=0;e<sector.edges.length;++e)
{var edge=sector.edges[e];if(edge.dest)
{var dist=point_line_distance_circle(x,y,edge.x0,edge.y0,edge.x1,edge.y1);if(dist<=d)
{find_nearby_sectors_(x,y,edge.dest,d,found);}}}}
function find_nearby_sectors(x,y,sector,d)
{var found={};find_nearby_sectors_(x,y,sector,d,found);var found_sectors=[];for(var s in found)
{found_sectors.push(sectors[s]);}
return found_sectors;}
function move_camera_by(dx,dy,t)
{var radius=player.radius;var d=Math.sqrt(dx*dx+dy*dy);var nearby_sectors=find_nearby_sectors(player.x,player.y,player.s,d+radius);for(var s=0;s<nearby_sectors.length;++s)
{for(var e=0;e<nearby_sectors[s].edges.length;++e)
{var edge=nearby_sectors[s].edges[e];if(edge.dest&&(player.z+player.maxstep>=edge.dest.floor_height&&player.z+player.height<=edge.dest.ceiling_height))
{}
else
{var dir=dx*(edge.y1-edge.y0)-dy*(edge.x1-edge.x0);if(dir>0)
{var dist=point_line_distance_circle(player.x+dx,player.y+dy,edge.x0,edge.y0,edge.x1,edge.y1);if(dist<radius)
{var d=radius-dist;var nx=edge.y0-edge.y1;var ny=edge.x1-edge.x0;var n=d/Math.sqrt(nx*nx+ny*ny);dx+=nx*n;dy+=ny*n;}}}}}
player.x+=dx;player.y+=dy;var new_sectors;for(var s=0;s<nearby_sectors.length;++s)
{if(point_is_in_polygon(player.x,player.y,nearby_sectors[s]))
{player.s=nearby_sectors[s];break;}}}
function rotate_camera(da)
{var a=Math.atan2(player.dx,player.dy);a-=da;player.dx=Math.sin(a);player.dy=Math.cos(a);}
function move_camera(dx,dy)
{var d=Math.sqrt(dx*dx+dy*dy);dx/=d;dy/=d;var step_size=player.radius/2;while(d>=step_size)
{move_camera_by(dx*step_size,dy*step_size,1);d-=step_size;}
if(d>0)
{move_camera_by(dx*d,dy*d,1);}}
function walk_camera(forwards,sideways)
{var dx=player.dx*forwards-player.dy*sideways;var dy=player.dy*forwards+player.dx*sideways;move_camera(dx,dy);}
function jump()
{if(player.on_floor)
{player.vz=2;}}
function process_input(keys,dt)
{var walk_speed=1.5;var strafe_speed=walk_speed/2;var turn_speed=1;var look_speed=1;if(keys[DOM_VK.LEFT]){rotate_camera(-turn_speed*dt);}
if(keys[DOM_VK.RIGHT]){rotate_camera(turn_speed*dt);}
var dx=0,dy=0;if(keys[DOM_VK.UP]){dx+=walk_speed;}
if(keys[DOM_VK.DOWN]){dx-=walk_speed;}
if(keys[DOM_VK.COMMA]||keys[DOM_VK.PRINTSCREEN]||keys[DOM_VK.X])
{dy-=strafe_speed;}
if(keys[DOM_VK.PERIOD]||keys[DOM_VK.DELETE]||keys[DOM_VK.C])
{dy+=strafe_speed;}
if(dx||dy)
{var d=Math.sqrt(dx*dx+dy*dy);dx/=d;dy/=d;walk_camera(dx*walk_speed*dt,dy*walk_speed*dt);}
if(keys[DOM_VK.PAGE_UP]){player.dh=Math.min(+max_vertical_look,player.dh+look_speed*dt);}
if(keys[DOM_VK.PAGE_DOWN]){player.dh=Math.max(-max_vertical_look,player.dh-look_speed*dt);}
if(keys[DOM_VK.SPACE]){jump();}}
function do_gravity(dt)
{var gravity_accel=5;var max_floor=-Infinity,min_ceiling=Infinity;var r=player.radius-0.01;var nearby_sectors=find_nearby_sectors(player.x,player.y,player.s,r);for(var s=0;s<nearby_sectors.length;++s)
{max_floor=Math.max(nearby_sectors[s].floor_height,max_floor);min_ceiling=Math.min(nearby_sectors[s].ceiling_height,min_ceiling);}
if(player.z==max_floor&&player.vz<=0)
{player.vz=0;player.on_floor=true;}
else
{player.vz-=gravity_accel*dt;player.on_floor=false;if(player.vz>0)
{if(player.z+player.vz*dt+player.height<=min_ceiling)
{player.z+=player.vz*dt;}
else
{player.z=min_ceiling-player.height;player.vz=0;}}
else if(player.vz<0)
{if(player.z+player.vz*dt>=max_floor)
{player.z+=player.vz*dt;}
else
{player.z=max_floor;player.vz=0;player.on_floor=true;}}}}
function process_scripts(dt)
{for(var i=0;i<level_data.proximity_triggers.length;++i)
{var trigger=level_data.proximity_triggers[i];var dist=point_distance(trigger.x,trigger.y,player.x,player.y);trigger.fn(dt,dist);}}
function draw_map(ctx)
{ctx.fillStyle='#fffff0';var w=ctx.canvas.width;var h=ctx.canvas.height;ctx.fillRect((-map_shift_x-w/2)/map_scale,(-map_shift_y-h/2)/map_scale,w/map_scale,h/map_scale);var d='';for(var s=0;s<sectors.length;++s)
{var sector=sectors[s];for(var e=0;e<sector.edges.length;++e)
{var edge=sector.edges[e];if(sector==camera.s)
{ctx.strokeStyle='#0000ff';}
else if(edge.dest===null)
{ctx.strokeStyle='#00ff00';}
else
{ctx.strokeStyle='#ff0000';}
ctx.beginPath();ctx.moveTo(edge.x0,edge.y0);ctx.lineTo(edge.x1,edge.y1);ctx.stroke();}}
ctx.strokeStyle='#ff00ff';ctx.beginPath();ctx.moveTo(camera.x,camera.y);ctx.lineTo(camera.x+camera.dx*0.2,camera.y+camera.dy*0.2);ctx.stroke();ctx.closePath();}
function fpsgraph_enable(state)
{if(!fpsgraph_enabled)
{var obj=document.createElementNS('http://www.w3.org/1999/xhtml','object');obj.width=640;obj.height=320;obj.data='fpsgraph/fpsgraph.xhtml';obj.id='fpsgraph';$('fpsgraph_container').appendChild(obj);$('fpsgraph_container').style.display='block';fpsgraph_enabled=true;}}
const STATE_LOADING=0;const STATE_PLAYING=1;var game_state=STATE_LOADING;function game_tick(ctx,dctx,gctx,w,h,keys,dt)
{switch(game_state)
{case STATE_LOADING:break;case STATE_PLAYING:process_input(keys,dt);do_gravity(dt);process_scripts(dt);camera.x=player.x;camera.y=player.y;camera.z=player.z+player.eyeline;camera.dx=player.dx;camera.dy=player.dy;camera.dh=player.dh;camera.s=player.s;camera.t+=dt;if(dctx)
{profile_begin('map');draw_map(dctx);profile_end('map');}
process_pending_textures(ctx);render_frame(ctx,dctx,gctx,w,h,camera);break;}}
function on_map_loaded(ctx,h)
{preprocess_map(ctx,h);if(editor_enabled)
{var reload_map=function()
{preprocess_map(ctx,h);};editor_init(reload_map);}
game_state=STATE_PLAYING;}
window.addEventListener('load',function()
{profiler_enabled=($('profile')!==null);var screen_ctx=$('c').getContext('2d');var w=$('c').width;var h=$('c').height;var render_ctx,render_canvas;if(options_flags.double_buffer)
{render_canvas=document.createElementNS('http://www.w3.org/1999/xhtml','canvas');render_canvas.width=w;render_canvas.height=h;render_ctx=render_canvas.getContext('2d');}
else
{render_ctx=screen_ctx;}
if(options_flags.opera_context)
{try
{var gctx=$('c').getContext('opera-2dgame');if(gctx)
{gctx.lockCanvasUpdates(true);}}
catch(e)
{}}
var dctx;if(options_flags.map&&$('dc'))
{dctx=$('dc').getContext('2d');dctx.lineWidth=1/map_scale;dctx.translate(map_shift_x+dctx.canvas.width/2,map_shift_y+dctx.canvas.height/2);dctx.scale(map_scale,map_scale);}
window.change_res=function(new_w,new_h,ui_class)
{w=new_w;h=new_h;if(render_ctx!=screen_ctx)
{render_canvas.width=w;render_canvas.height=h;}
$('c').width=w;$('c').height=h;$('ui').setAttribute('class',ui_class);preprocess_map(render_ctx,h);};var last_frame_time=null;function tick()
{try
{var now=new Date();var dt=Math.max(0,now-(last_frame_time||now))/1000;last_frame_time=now;game_tick(render_ctx,dctx,gctx,w,h,keys,dt);if(render_ctx!==screen_ctx)
{screen_ctx.drawImage(render_canvas,0,0);}
profile_report();framerate_update();}
catch(e)
{debug(e);}}
var paused=true;var frame_interval;function toggle_paused()
{paused=!paused;if(paused)
{render_paused(screen_ctx,w,h);clearInterval(frame_interval);last_frame_time=null;}
else
{frame_interval=setInterval(tick,editor_enabled?100:0);}}
$('pause').onclick=toggle_paused;if(dctx)
{$('dc').onmousemove=function(e)
{var x=e.clientX-this.offsetLeft;var y=e.clientY-this.offsetTop;x-=player.x*map_scale+map_shift_x+dctx.canvas.width/2;y-=player.y*map_scale+map_shift_y+dctx.canvas.height/2;var mag=Math.sqrt(x*x+y*y);x/=mag;y/=mag;player.dx=x;player.dy=y;};$('dc').onclick=function(e)
{var x=e.clientX-this.offsetLeft;var y=e.clientY-this.offsetTop;move_camera((x-map_shift_x-dctx.canvas.width/2)/map_scale-player.x,(y-map_shift_y-dctx.canvas.height/2)/map_scale-player.y);};}
var keys={};document.addEventListener('keydown',function(e)
{keys[e.keyCode]=true;},false);document.addEventListener('keyup',function(e)
{keys[e.keyCode]=false;},false);document.addEventListener('keypress',function(e)
{var handled=true;switch(e.keyCode)
{case DOM_VK.LEFT:case DOM_VK.RIGHT:case DOM_VK.UP:case DOM_VK.DOWN:case DOM_VK.PAGE_UP:case DOM_VK.PAGE_DOWN:case DOM_VK.COMMA:case DOM_VK.PERIOD:case DOM_VK.DELETE:handled=false;e.preventDefault();break;case DOM_VK.PAUSE:toggle_paused();break;case DOM_VK.HOME:case DOM_VK.END:player.dh=0;break;default:switch(e.which)
{case 116:if(e.ctrlKey)
{handled=false;}
else
{fpsgraph_enable(true);}
break;case 32:case 44:case 46:case 120:case 99:handled=false;e.preventDefault();break;default:handled=false;break;}}
if(handled)
{e.preventDefault();e.stopPropagation();}},false);if(level)
{on_map_loaded(render_ctx,h);}
else
{load_from_file_store_async('map_test0',function(obj)
{level=obj;on_map_loaded(render_ctx,h);});}
if(ui_enabled)
{try
{ui.init();}
catch(e)
{alert('UI initialisation failure: '+e);}}
toggle_paused();},false);})();