From 6602b8d2499a060cab023fc8ba71a102ecf81d9e Mon Sep 17 00:00:00 2001
From: Liu Xiaoyi <circuitcoder0@gmail.com>
Date: Fri, 31 Mar 2023 23:46:12 +0800
Subject: [PATCH] Meow

meow meow meow
---
 404.html                |   3 +
 _layouts/index.html     |   3 +
 static/css/meow.css     |  49 +++++++++
 static/js/matter.min.js |   6 ++
 static/js/meow.js       | 226 ++++++++++++++++++++++++++++++++++++++++
 5 files changed, 287 insertions(+)
 create mode 100644 static/css/meow.css
 create mode 100644 static/js/matter.min.js
 create mode 100644 static/js/meow.js

diff --git a/404.html b/404.html
index 58ffcf7..58f1bde 100644
--- a/404.html
+++ b/404.html
@@ -61,6 +61,9 @@ permalink: /404.html
         mrLink.href = mrURL.href;
       })();
     </script>
+    <script src="/static/js/matter.min.js?{{ site.data['hash'] }}"></script>
+    <script src="/static/js/meow.js?{{ site.data['hash'] }}"></script>
+    <link rel="stylesheet" href="/static/css/meow.css?{{ site.data['hash'] }}">
   </body>
 </html>
 <!--
diff --git a/_layouts/index.html b/_layouts/index.html
index c7a590d..0018574 100644
--- a/_layouts/index.html
+++ b/_layouts/index.html
@@ -216,6 +216,9 @@
 	{% endraw %}
 	{% unless page.legacy or site.issue %}
 	<script src="/static/js/index.js?{{ site.data['hash'] }}"></script>
+	<script src="/static/js/matter.min.js?{{ site.data['hash'] }}"></script>
+	<script src="/static/js/meow.js?{{ site.data['hash'] }}"></script>
+	<link rel="stylesheet" href="/static/css/meow.css?{{ site.data['hash'] }}">
 	{% endunless %}
 </html>
 <!--
diff --git a/static/css/meow.css b/static/css/meow.css
new file mode 100644
index 0000000..cb9e416
--- /dev/null
+++ b/static/css/meow.css
@@ -0,0 +1,49 @@
+* {
+  overflow: visible;
+}
+
+#mirror-list {
+  overflow-x: visible !important;
+  overflow-y: visible !important;
+}
+
+.meow-floating {
+  z-index: 1000;
+}
+
+.meow-floating > * {
+  z-index: 1000;
+  position: relative;
+}
+
+
+.meow-floating::before {
+  content: '';
+  display: block;
+  position: absolute;
+  left: 0;
+  top: 0;
+  width: var(--real-width);
+  height: var(--real-height);
+  box-shadow: rgba(0,0,0,.3) 0 4px 12px;
+}
+
+.meow-floating::before {
+  background: #F9F9F9;
+  z-index: -1;
+}
+
+/*
+.meow-floating::after {
+  transform: var(--inverse);
+  box-shadow: rgba(0,0,0,.3) 0 2px 6px inset;
+  background: rgba(0,0,0,.5);
+  z-index: -10 !important;
+}
+*/
+
+@media (prefers-color-scheme: dark) {
+  .meow-floating::before {
+    background: #333;
+  }
+}
\ No newline at end of file
diff --git a/static/js/matter.min.js b/static/js/matter.min.js
new file mode 100644
index 0000000..1b31215
--- /dev/null
+++ b/static/js/matter.min.js
@@ -0,0 +1,6 @@
+/*!
+ * matter-js 0.19.0 by @liabru
+ * http://brm.io/matter-js/
+ * License MIT
+ */
+!function(e,t){"object"==typeof exports&&"object"==typeof module?module.exports=t():"function"==typeof define&&define.amd?define("Matter",[],t):"object"==typeof exports?exports.Matter=t():e.Matter=t()}(this,(function(){return function(e){var t={};function n(i){if(t[i])return t[i].exports;var o=t[i]={i:i,l:!1,exports:{}};return e[i].call(o.exports,o,o.exports,n),o.l=!0,o.exports}return n.m=e,n.c=t,n.d=function(e,t,i){n.o(e,t)||Object.defineProperty(e,t,{enumerable:!0,get:i})},n.r=function(e){"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(e,"__esModule",{value:!0})},n.t=function(e,t){if(1&t&&(e=n(e)),8&t)return e;if(4&t&&"object"==typeof e&&e&&e.__esModule)return e;var i=Object.create(null);if(n.r(i),Object.defineProperty(i,"default",{enumerable:!0,value:e}),2&t&&"string"!=typeof e)for(var o in e)n.d(i,o,function(t){return e[t]}.bind(null,o));return i},n.n=function(e){var 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n=e.inertia/(e.mass/6);e.inertia=n*(t/6),e.inverseInertia=1/e.inertia,e.mass=t,e.inverseMass=1/e.mass,e.density=e.mass/e.area},i.setDensity=function(e,t){i.setMass(e,t*e.area),e.density=t},i.setInertia=function(e,t){e.inertia=t,e.inverseInertia=1/e.inertia},i.setVertices=function(e,t){t[0].body===e?e.vertices=t:e.vertices=o.create(t,e),e.axes=c.fromVertices(e.vertices),e.area=o.area(e.vertices),i.setMass(e,e.density*e.area);var n=o.centre(e.vertices);o.translate(e.vertices,n,-1),i.setInertia(e,i._inertiaScale*o.inertia(e.vertices,e.mass)),o.translate(e.vertices,e.position),l.update(e.bounds,e.vertices,e.velocity)},i.setParts=function(e,t,n){var r;for(t=t.slice(0),e.parts.length=0,e.parts.push(e),e.parent=e,r=0;r<t.length;r++){var a=t[r];a!==e&&(a.parent=e,e.parts.push(a))}if(1!==e.parts.length){if(n=void 0===n||n){var s=[];for(r=0;r<t.length;r++)s=s.concat(t[r].vertices);o.clockwiseSort(s);var l=o.hull(s),c=o.centre(l);i.setVertices(e,l),o.translate(e.vertices,c)}var u=i._totalProperties(e);e.area=u.area,e.parent=e,e.position.x=u.centre.x,e.position.y=u.centre.y,e.positionPrev.x=u.centre.x,e.positionPrev.y=u.centre.y,i.setMass(e,u.mass),i.setInertia(e,u.inertia),i.setPosition(e,u.centre)}},i.setCentre=function(e,t,n){n?(e.positionPrev.x+=t.x,e.positionPrev.y+=t.y,e.position.x+=t.x,e.position.y+=t.y):(e.positionPrev.x=t.x-(e.position.x-e.positionPrev.x),e.positionPrev.y=t.y-(e.position.y-e.positionPrev.y),e.position.x=t.x,e.position.y=t.y)},i.setPosition=function(e,t,n){var i=r.sub(t,e.position);n?(e.positionPrev.x=e.position.x,e.positionPrev.y=e.position.y,e.velocity.x=i.x,e.velocity.y=i.y,e.speed=r.magnitude(i)):(e.positionPrev.x+=i.x,e.positionPrev.y+=i.y);for(var a=0;a<e.parts.length;a++){var s=e.parts[a];s.position.x+=i.x,s.position.y+=i.y,o.translate(s.vertices,i),l.update(s.bounds,s.vertices,e.velocity)}},i.setAngle=function(e,t,n){var i=t-e.angle;n?(e.anglePrev=e.angle,e.angularVelocity=i,e.angularSpeed=Math.abs(i)):e.anglePrev+=i;for(var 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string."),{name:e.split("@")[0],range:e.split("@")[1]||"*"}):{name:e.name,range:e.range||e.version}},i.versionParse=function(e){var t=/^(\*)|(\^|~|>=|>)?\s*((\d+)\.(\d+)\.(\d+))(-[0-9A-Za-z-+]+)?$/;t.test(e)||o.warn("Plugin.versionParse:",e,"is not a valid version or range.");var n=t.exec(e),i=Number(n[4]),r=Number(n[5]),a=Number(n[6]);return{isRange:Boolean(n[1]||n[2]),version:n[3],range:e,operator:n[1]||n[2]||"",major:i,minor:r,patch:a,parts:[i,r,a],prerelease:n[7],number:1e8*i+1e4*r+a}},i.versionSatisfies=function(e,t){t=t||"*";var n=i.versionParse(t),o=i.versionParse(e);if(n.isRange){if("*"===n.operator||"*"===e)return!0;if(">"===n.operator)return o.number>n.number;if(">="===n.operator)return o.number>=n.number;if("~"===n.operator)return o.major===n.major&&o.minor===n.minor&&o.patch>=n.patch;if("^"===n.operator)return n.major>0?o.major===n.major&&o.number>=n.number:n.minor>0?o.minor===n.minor&&o.patch>=n.patch:o.patch===n.patch}return e===t||"*"===e}},function(e,t){var n={};e.exports=n,n.create=function(e){return{vertex:e,normalImpulse:0,tangentImpulse:0}}},function(e,t,n){var i={};e.exports=i;var o=n(7),r=n(18),a=n(13),s=n(19),l=n(5),c=n(6),u=n(10),d=n(0),p=n(4);i.create=function(e){e=e||{};var t=d.extend({positionIterations:6,velocityIterations:4,constraintIterations:2,enableSleeping:!1,events:[],plugin:{},gravity:{x:0,y:1,scale:.001},timing:{timestamp:0,timeScale:1,lastDelta:0,lastElapsed:0}},e);return t.world=e.world||c.create({label:"World"}),t.pairs=e.pairs||s.create(),t.detector=e.detector||a.create(),t.grid={buckets:[]},t.world.gravity=t.gravity,t.broadphase=t.grid,t.metrics={},t},i.update=function(e,t){var n,p=d.now(),f=e.world,v=e.detector,y=e.pairs,m=e.timing,g=m.timestamp;t=void 0!==t?t:d._baseDelta,t*=m.timeScale,m.timestamp+=t,m.lastDelta=t;var x={timestamp:m.timestamp,delta:t};l.trigger(e,"beforeUpdate",x);var h=c.allBodies(f),b=c.allConstraints(f);for(f.isModified&&(a.setBodies(v,h),c.setModified(f,!1,!1,!0)),e.enableSleeping&&o.update(h,t),i._bodiesApplyGravity(h,e.gravity),t>0&&i._bodiesUpdate(h,t),u.preSolveAll(h),n=0;n<e.constraintIterations;n++)u.solveAll(b,t);u.postSolveAll(h),v.pairs=e.pairs;var S=a.collisions(v);s.update(y,S,g),e.enableSleeping&&o.afterCollisions(y.list),y.collisionStart.length>0&&l.trigger(e,"collisionStart",{pairs:y.collisionStart});var w=d.clamp(20/e.positionIterations,0,1);for(r.preSolvePosition(y.list),n=0;n<e.positionIterations;n++)r.solvePosition(y.list,t,w);for(r.postSolvePosition(h),u.preSolveAll(h),n=0;n<e.constraintIterations;n++)u.solveAll(b,t);for(u.postSolveAll(h),r.preSolveVelocity(y.list),n=0;n<e.velocityIterations;n++)r.solveVelocity(y.list,t);return i._bodiesUpdateVelocities(h),y.collisionActive.length>0&&l.trigger(e,"collisionActive",{pairs:y.collisionActive}),y.collisionEnd.length>0&&l.trigger(e,"collisionEnd",{pairs:y.collisionEnd}),i._bodiesClearForces(h),l.trigger(e,"afterUpdate",x),e.timing.lastElapsed=d.now()-p,e},i.merge=function(e,t){if(d.extend(e,t),t.world){e.world=t.world,i.clear(e);for(var n=c.allBodies(e.world),r=0;r<n.length;r++){var a=n[r];o.set(a,!1),a.id=d.nextId()}}},i.clear=function(e){s.clear(e.pairs),a.clear(e.detector)},i._bodiesClearForces=function(e){for(var t=e.length,n=0;n<t;n++){var i=e[n];i.force.x=0,i.force.y=0,i.torque=0}},i._bodiesApplyGravity=function(e,t){var n=void 0!==t.scale?t.scale:.001,i=e.length;if((0!==t.x||0!==t.y)&&0!==n)for(var o=0;o<i;o++){var r=e[o];r.isStatic||r.isSleeping||(r.force.y+=r.mass*t.y*n,r.force.x+=r.mass*t.x*n)}},i._bodiesUpdate=function(e,t){for(var n=e.length,i=0;i<n;i++){var o=e[i];o.isStatic||o.isSleeping||p.update(o,t)}},i._bodiesUpdateVelocities=function(e){for(var t=e.length,n=0;n<t;n++)p.updateVelocities(e[n])}},function(e,t,n){var i={};e.exports=i;var o=n(3),r=n(0),a=n(1);i._restingThresh=2,i._restingThreshTangent=Math.sqrt(6),i._positionDampen=.9,i._positionWarming=.8,i._frictionNormalMultiplier=5,i._frictionMaxStatic=Number.MAX_VALUE,i.preSolvePosition=function(e){var t,n,i,o=e.length;for(t=0;t<o;t++)(n=e[t]).isActive&&(i=n.activeContacts.length,n.collision.parentA.totalContacts+=i,n.collision.parentB.totalContacts+=i)},i.solvePosition=function(e,t,n){var o,a,s,l,c,u,d,p,f=i._positionDampen*(n||1),v=r.clamp(t/r._baseDelta,0,1),y=e.length;for(o=0;o<y;o++)(a=e[o]).isActive&&!a.isSensor&&(l=(s=a.collision).parentA,c=s.parentB,u=s.normal,a.separation=u.x*(c.positionImpulse.x+s.penetration.x-l.positionImpulse.x)+u.y*(c.positionImpulse.y+s.penetration.y-l.positionImpulse.y));for(o=0;o<y;o++)(a=e[o]).isActive&&!a.isSensor&&(l=(s=a.collision).parentA,c=s.parentB,u=s.normal,p=a.separation-a.slop*v,(l.isStatic||c.isStatic)&&(p*=2),l.isStatic||l.isSleeping||(d=f/l.totalContacts,l.positionImpulse.x+=u.x*p*d,l.positionImpulse.y+=u.y*p*d),c.isStatic||c.isSleeping||(d=f/c.totalContacts,c.positionImpulse.x-=u.x*p*d,c.positionImpulse.y-=u.y*p*d))},i.postSolvePosition=function(e){for(var t=i._positionWarming,n=e.length,r=o.translate,s=a.update,l=0;l<n;l++){var c=e[l],u=c.positionImpulse,d=u.x,p=u.y,f=c.velocity;if(c.totalContacts=0,0!==d||0!==p){for(var v=0;v<c.parts.length;v++){var y=c.parts[v];r(y.vertices,u),s(y.bounds,y.vertices,f),y.position.x+=d,y.position.y+=p}c.positionPrev.x+=d,c.positionPrev.y+=p,d*f.x+p*f.y<0?(u.x=0,u.y=0):(u.x*=t,u.y*=t)}}},i.preSolveVelocity=function(e){var t,n,i=e.length;for(t=0;t<i;t++){var o=e[t];if(o.isActive&&!o.isSensor){var r=o.activeContacts,a=r.length,s=o.collision,l=s.parentA,c=s.parentB,u=s.normal,d=s.tangent;for(n=0;n<a;n++){var p=r[n],f=p.vertex,v=p.normalImpulse,y=p.tangentImpulse;if(0!==v||0!==y){var m=u.x*v+d.x*y,g=u.y*v+d.y*y;l.isStatic||l.isSleeping||(l.positionPrev.x+=m*l.inverseMass,l.positionPrev.y+=g*l.inverseMass,l.anglePrev+=l.inverseInertia*((f.x-l.position.x)*g-(f.y-l.position.y)*m)),c.isStatic||c.isSleeping||(c.positionPrev.x-=m*c.inverseMass,c.positionPrev.y-=g*c.inverseMass,c.anglePrev-=c.inverseInertia*((f.x-c.position.x)*g-(f.y-c.position.y)*m))}}}}},i.solveVelocity=function(e,t){var n,o,a,s,l=t/r._baseDelta,c=l*l*l,u=-i._restingThresh*l,d=i._restingThreshTangent,p=i._frictionNormalMultiplier*l,f=i._frictionMaxStatic,v=e.length;for(a=0;a<v;a++){var y=e[a];if(y.isActive&&!y.isSensor){var m=y.collision,g=m.parentA,x=m.parentB,h=g.velocity,b=x.velocity,S=m.normal.x,w=m.normal.y,A=m.tangent.x,P=m.tangent.y,C=y.activeContacts,M=C.length,B=1/M,_=g.inverseMass+x.inverseMass,k=y.friction*y.frictionStatic*p;for(h.x=g.position.x-g.positionPrev.x,h.y=g.position.y-g.positionPrev.y,b.x=x.position.x-x.positionPrev.x,b.y=x.position.y-x.positionPrev.y,g.angularVelocity=g.angle-g.anglePrev,x.angularVelocity=x.angle-x.anglePrev,s=0;s<M;s++){var I=C[s],T=I.vertex,R=T.x-g.position.x,V=T.y-g.position.y,E=T.x-x.position.x,L=T.y-x.position.y,D=h.x-V*g.angularVelocity,O=h.y+R*g.angularVelocity,F=D-(b.x-L*x.angularVelocity),H=O-(b.y+E*x.angularVelocity),j=S*F+w*H,q=A*F+P*H,W=y.separation+j,G=Math.min(W,1),U=(G=W<0?0:G)*k;q<-U||q>U?(o=q>0?q:-q,(n=y.friction*(q>0?1:-1)*c)<-o?n=-o:n>o&&(n=o)):(n=q,o=f);var N=R*w-V*S,z=E*w-L*S,X=B/(_+g.inverseInertia*N*N+x.inverseInertia*z*z),Q=(1+y.restitution)*j*X;if(n*=X,j<u)I.normalImpulse=0;else{var Y=I.normalImpulse;I.normalImpulse+=Q,I.normalImpulse>0&&(I.normalImpulse=0),Q=I.normalImpulse-Y}if(q<-d||q>d)I.tangentImpulse=0;else{var Z=I.tangentImpulse;I.tangentImpulse+=n,I.tangentImpulse<-o&&(I.tangentImpulse=-o),I.tangentImpulse>o&&(I.tangentImpulse=o),n=I.tangentImpulse-Z}var $=S*Q+A*n,J=w*Q+P*n;g.isStatic||g.isSleeping||(g.positionPrev.x+=$*g.inverseMass,g.positionPrev.y+=J*g.inverseMass,g.anglePrev+=(R*J-V*$)*g.inverseInertia),x.isStatic||x.isSleeping||(x.positionPrev.x-=$*x.inverseMass,x.positionPrev.y-=J*x.inverseMass,x.anglePrev-=(E*J-L*$)*x.inverseInertia)}}}}},function(e,t,n){var i={};e.exports=i;var o=n(9),r=n(0);i.create=function(e){return r.extend({table:{},list:[],collisionStart:[],collisionActive:[],collisionEnd:[]},e)},i.update=function(e,t,n){var i,r,a,s,l=e.list,c=l.length,u=e.table,d=t.length,p=e.collisionStart,f=e.collisionEnd,v=e.collisionActive;for(p.length=0,f.length=0,v.length=0,s=0;s<c;s++)l[s].confirmedActive=!1;for(s=0;s<d;s++)(a=(i=t[s]).pair)?(a.isActive?v.push(a):p.push(a),o.update(a,i,n),a.confirmedActive=!0):(u[(a=o.create(i,n)).id]=a,p.push(a),l.push(a));var y=[];for(c=l.length,s=0;s<c;s++)(a=l[s]).confirmedActive||(o.setActive(a,!1,n),f.push(a),a.collision.bodyA.isSleeping||a.collision.bodyB.isSleeping||y.push(s));for(s=0;s<y.length;s++)a=l[r=y[s]-s],l.splice(r,1),delete u[a.id]},i.clear=function(e){return e.table={},e.list.length=0,e.collisionStart.length=0,e.collisionActive.length=0,e.collisionEnd.length=0,e}},function(e,t,n){var i=e.exports=n(21);i.Axes=n(11),i.Bodies=n(12),i.Body=n(4),i.Bounds=n(1),i.Collision=n(8),i.Common=n(0),i.Composite=n(6),i.Composites=n(22),i.Constraint=n(10),i.Contact=n(16),i.Detector=n(13),i.Engine=n(17),i.Events=n(5),i.Grid=n(23),i.Mouse=n(14),i.MouseConstraint=n(24),i.Pair=n(9),i.Pairs=n(19),i.Plugin=n(15),i.Query=n(25),i.Render=n(26),i.Resolver=n(18),i.Runner=n(27),i.SAT=n(28),i.Sleeping=n(7),i.Svg=n(29),i.Vector=n(2),i.Vertices=n(3),i.World=n(30),i.Engine.run=i.Runner.run,i.Common.deprecated(i.Engine,"run","Engine.run ➤ use Matter.Runner.run(engine) instead")},function(e,t,n){var i={};e.exports=i;var o=n(15),r=n(0);i.name="matter-js",i.version="0.19.0",i.uses=[],i.used=[],i.use=function(){o.use(i,Array.prototype.slice.call(arguments))},i.before=function(e,t){return e=e.replace(/^Matter./,""),r.chainPathBefore(i,e,t)},i.after=function(e,t){return e=e.replace(/^Matter./,""),r.chainPathAfter(i,e,t)}},function(e,t,n){var i={};e.exports=i;var o=n(6),r=n(10),a=n(0),s=n(4),l=n(12),c=a.deprecated;i.stack=function(e,t,n,i,r,a,l){for(var c,u=o.create({label:"Stack"}),d=e,p=t,f=0,v=0;v<i;v++){for(var y=0,m=0;m<n;m++){var g=l(d,p,m,v,c,f);if(g){var x=g.bounds.max.y-g.bounds.min.y,h=g.bounds.max.x-g.bounds.min.x;x>y&&(y=x),s.translate(g,{x:.5*h,y:.5*x}),d=g.bounds.max.x+r,o.addBody(u,g),c=g,f+=1}else d+=r}p+=y+a,d=e}return u},i.chain=function(e,t,n,i,s,l){for(var c=e.bodies,u=1;u<c.length;u++){var d=c[u-1],p=c[u],f=d.bounds.max.y-d.bounds.min.y,v=d.bounds.max.x-d.bounds.min.x,y=p.bounds.max.y-p.bounds.min.y,m={bodyA:d,pointA:{x:v*t,y:f*n},bodyB:p,pointB:{x:(p.bounds.max.x-p.bounds.min.x)*i,y:y*s}},g=a.extend(m,l);o.addConstraint(e,r.create(g))}return e.label+=" Chain",e},i.mesh=function(e,t,n,i,s){var l,c,u,d,p,f=e.bodies;for(l=0;l<n;l++){for(c=1;c<t;c++)u=f[c-1+l*t],d=f[c+l*t],o.addConstraint(e,r.create(a.extend({bodyA:u,bodyB:d},s)));if(l>0)for(c=0;c<t;c++)u=f[c+(l-1)*t],d=f[c+l*t],o.addConstraint(e,r.create(a.extend({bodyA:u,bodyB:d},s))),i&&c>0&&(p=f[c-1+(l-1)*t],o.addConstraint(e,r.create(a.extend({bodyA:p,bodyB:d},s)))),i&&c<t-1&&(p=f[c+1+(l-1)*t],o.addConstraint(e,r.create(a.extend({bodyA:p,bodyB:d},s))))}return e.label+=" Mesh",e},i.pyramid=function(e,t,n,o,r,a,l){return i.stack(e,t,n,o,r,a,(function(t,i,a,c,u,d){var p=Math.min(o,Math.ceil(n/2)),f=u?u.bounds.max.x-u.bounds.min.x:0;if(!(c>p||a<(c=p-c)||a>n-1-c))return 1===d&&s.translate(u,{x:(a+(n%2==1?1:-1))*f,y:0}),l(e+(u?a*f:0)+a*r,i,a,c,u,d)}))},i.newtonsCradle=function(e,t,n,i,a){for(var s=o.create({label:"Newtons Cradle"}),c=0;c<n;c++){var u=l.circle(e+c*(1.9*i),t+a,i,{inertia:1/0,restitution:1,friction:0,frictionAir:1e-4,slop:1}),d=r.create({pointA:{x:e+c*(1.9*i),y:t},bodyB:u});o.addBody(s,u),o.addConstraint(s,d)}return s},c(i,"newtonsCradle","Composites.newtonsCradle ➤ moved to newtonsCradle example"),i.car=function(e,t,n,i,a){var c=s.nextGroup(!0),u=.5*-n+20,d=.5*n-20,p=o.create({label:"Car"}),f=l.rectangle(e,t,n,i,{collisionFilter:{group:c},chamfer:{radius:.5*i},density:2e-4}),v=l.circle(e+u,t+0,a,{collisionFilter:{group:c},friction:.8}),y=l.circle(e+d,t+0,a,{collisionFilter:{group:c},friction:.8}),m=r.create({bodyB:f,pointB:{x:u,y:0},bodyA:v,stiffness:1,length:0}),g=r.create({bodyB:f,pointB:{x:d,y:0},bodyA:y,stiffness:1,length:0});return o.addBody(p,f),o.addBody(p,v),o.addBody(p,y),o.addConstraint(p,m),o.addConstraint(p,g),p},c(i,"car","Composites.car ➤ moved to car example"),i.softBody=function(e,t,n,o,r,s,c,u,d,p){d=a.extend({inertia:1/0},d),p=a.extend({stiffness:.2,render:{type:"line",anchors:!1}},p);var f=i.stack(e,t,n,o,r,s,(function(e,t){return l.circle(e,t,u,d)}));return i.mesh(f,n,o,c,p),f.label="Soft Body",f},c(i,"softBody","Composites.softBody ➤ moved to softBody and cloth examples")},function(e,t,n){var i={};e.exports=i;var o=n(9),r=n(0),a=r.deprecated;i.create=function(e){return r.extend({buckets:{},pairs:{},pairsList:[],bucketWidth:48,bucketHeight:48},e)},i.update=function(e,t,n,o){var r,a,s,l,c,u=n.world,d=e.buckets,p=!1;for(r=0;r<t.length;r++){var f=t[r];if((!f.isSleeping||o)&&(!u.bounds||!(f.bounds.max.x<u.bounds.min.x||f.bounds.min.x>u.bounds.max.x||f.bounds.max.y<u.bounds.min.y||f.bounds.min.y>u.bounds.max.y))){var v=i._getRegion(e,f);if(!f.region||v.id!==f.region.id||o){f.region&&!o||(f.region=v);var y=i._regionUnion(v,f.region);for(a=y.startCol;a<=y.endCol;a++)for(s=y.startRow;s<=y.endRow;s++){l=d[c=i._getBucketId(a,s)];var m=a>=v.startCol&&a<=v.endCol&&s>=v.startRow&&s<=v.endRow,g=a>=f.region.startCol&&a<=f.region.endCol&&s>=f.region.startRow&&s<=f.region.endRow;!m&&g&&g&&l&&i._bucketRemoveBody(e,l,f),(f.region===v||m&&!g||o)&&(l||(l=i._createBucket(d,c)),i._bucketAddBody(e,l,f))}f.region=v,p=!0}}}p&&(e.pairsList=i._createActivePairsList(e))},a(i,"update","Grid.update ➤ replaced by Matter.Detector"),i.clear=function(e){e.buckets={},e.pairs={},e.pairsList=[]},a(i,"clear","Grid.clear ➤ replaced by Matter.Detector"),i._regionUnion=function(e,t){var n=Math.min(e.startCol,t.startCol),o=Math.max(e.endCol,t.endCol),r=Math.min(e.startRow,t.startRow),a=Math.max(e.endRow,t.endRow);return i._createRegion(n,o,r,a)},i._getRegion=function(e,t){var n=t.bounds,o=Math.floor(n.min.x/e.bucketWidth),r=Math.floor(n.max.x/e.bucketWidth),a=Math.floor(n.min.y/e.bucketHeight),s=Math.floor(n.max.y/e.bucketHeight);return i._createRegion(o,r,a,s)},i._createRegion=function(e,t,n,i){return{id:e+","+t+","+n+","+i,startCol:e,endCol:t,startRow:n,endRow:i}},i._getBucketId=function(e,t){return"C"+e+"R"+t},i._createBucket=function(e,t){return e[t]=[]},i._bucketAddBody=function(e,t,n){var i,r=e.pairs,a=o.id,s=t.length;for(i=0;i<s;i++){var l=t[i];if(!(n.id===l.id||n.isStatic&&l.isStatic)){var c=a(n,l),u=r[c];u?u[2]+=1:r[c]=[n,l,1]}}t.push(n)},i._bucketRemoveBody=function(e,t,n){var i,a=e.pairs,s=o.id;t.splice(r.indexOf(t,n),1);var l=t.length;for(i=0;i<l;i++){var c=a[s(n,t[i])];c&&(c[2]-=1)}},i._createActivePairsList=function(e){var t,n,i=e.pairs,o=r.keys(i),a=o.length,s=[];for(n=0;n<a;n++)(t=i[o[n]])[2]>0?s.push(t):delete i[o[n]];return s}},function(e,t,n){var i={};e.exports=i;var o=n(3),r=n(7),a=n(14),s=n(5),l=n(13),c=n(10),u=n(6),d=n(0),p=n(1);i.create=function(e,t){var n=(e?e.mouse:null)||(t?t.mouse:null);n||(e&&e.render&&e.render.canvas?n=a.create(e.render.canvas):t&&t.element?n=a.create(t.element):(n=a.create(),d.warn("MouseConstraint.create: options.mouse was undefined, options.element was undefined, may not function as expected")));var o={type:"mouseConstraint",mouse:n,element:null,body:null,constraint:c.create({label:"Mouse Constraint",pointA:n.position,pointB:{x:0,y:0},length:.01,stiffness:.1,angularStiffness:1,render:{strokeStyle:"#90EE90",lineWidth:3}}),collisionFilter:{category:1,mask:4294967295,group:0}},r=d.extend(o,t);return s.on(e,"beforeUpdate",(function(){var t=u.allBodies(e.world);i.update(r,t),i._triggerEvents(r)})),r},i.update=function(e,t){var n=e.mouse,i=e.constraint,a=e.body;if(0===n.button){if(i.bodyB)r.set(i.bodyB,!1),i.pointA=n.position;else for(var c=0;c<t.length;c++)if(a=t[c],p.contains(a.bounds,n.position)&&l.canCollide(a.collisionFilter,e.collisionFilter))for(var u=a.parts.length>1?1:0;u<a.parts.length;u++){var d=a.parts[u];if(o.contains(d.vertices,n.position)){i.pointA=n.position,i.bodyB=e.body=a,i.pointB={x:n.position.x-a.position.x,y:n.position.y-a.position.y},i.angleB=a.angle,r.set(a,!1),s.trigger(e,"startdrag",{mouse:n,body:a});break}}}else i.bodyB=e.body=null,i.pointB=null,a&&s.trigger(e,"enddrag",{mouse:n,body:a})},i._triggerEvents=function(e){var t=e.mouse,n=t.sourceEvents;n.mousemove&&s.trigger(e,"mousemove",{mouse:t}),n.mousedown&&s.trigger(e,"mousedown",{mouse:t}),n.mouseup&&s.trigger(e,"mouseup",{mouse:t}),a.clearSourceEvents(t)}},function(e,t,n){var i={};e.exports=i;var o=n(2),r=n(8),a=n(1),s=n(12),l=n(3);i.collides=function(e,t){for(var n=[],i=t.length,o=e.bounds,s=r.collides,l=a.overlaps,c=0;c<i;c++){var u=t[c],d=u.parts.length,p=1===d?0:1;if(l(u.bounds,o))for(var f=p;f<d;f++){var v=u.parts[f];if(l(v.bounds,o)){var y=s(v,e);if(y){n.push(y);break}}}}return n},i.ray=function(e,t,n,r){r=r||1e-100;for(var a=o.angle(t,n),l=o.magnitude(o.sub(t,n)),c=.5*(n.x+t.x),u=.5*(n.y+t.y),d=s.rectangle(c,u,l,r,{angle:a}),p=i.collides(d,e),f=0;f<p.length;f+=1){var v=p[f];v.body=v.bodyB=v.bodyA}return p},i.region=function(e,t,n){for(var i=[],o=0;o<e.length;o++){var r=e[o],s=a.overlaps(r.bounds,t);(s&&!n||!s&&n)&&i.push(r)}return i},i.point=function(e,t){for(var n=[],i=0;i<e.length;i++){var o=e[i];if(a.contains(o.bounds,t))for(var r=1===o.parts.length?0:1;r<o.parts.length;r++){var s=o.parts[r];if(a.contains(s.bounds,t)&&l.contains(s.vertices,t)){n.push(o);break}}}return n}},function(e,t,n){var i={};e.exports=i;var o=n(4),r=n(0),a=n(6),s=n(1),l=n(5),c=n(2),u=n(14);!function(){var e,t;"undefined"!=typeof window&&(e=window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||window.msRequestAnimationFrame||function(e){window.setTimeout((function(){e(r.now())}),1e3/60)},t=window.cancelAnimationFrame||window.mozCancelAnimationFrame||window.webkitCancelAnimationFrame||window.msCancelAnimationFrame),i._goodFps=30,i._goodDelta=1e3/60,i.create=function(e){var t={engine:null,element:null,canvas:null,mouse:null,frameRequestId:null,timing:{historySize:60,delta:0,deltaHistory:[],lastTime:0,lastTimestamp:0,lastElapsed:0,timestampElapsed:0,timestampElapsedHistory:[],engineDeltaHistory:[],engineElapsedHistory:[],elapsedHistory:[]},options:{width:800,height:600,pixelRatio:1,background:"#14151f",wireframeBackground:"#14151f",hasBounds:!!e.bounds,enabled:!0,wireframes:!0,showSleeping:!0,showDebug:!1,showStats:!1,showPerformance:!1,showBounds:!1,showVelocity:!1,showCollisions:!1,showSeparations:!1,showAxes:!1,showPositions:!1,showAngleIndicator:!1,showIds:!1,showVertexNumbers:!1,showConvexHulls:!1,showInternalEdges:!1,showMousePosition:!1}},n=r.extend(t,e);return n.canvas&&(n.canvas.width=n.options.width||n.canvas.width,n.canvas.height=n.options.height||n.canvas.height),n.mouse=e.mouse,n.engine=e.engine,n.canvas=n.canvas||p(n.options.width,n.options.height),n.context=n.canvas.getContext("2d"),n.textures={},n.bounds=n.bounds||{min:{x:0,y:0},max:{x:n.canvas.width,y:n.canvas.height}},n.controller=i,n.options.showBroadphase=!1,1!==n.options.pixelRatio&&i.setPixelRatio(n,n.options.pixelRatio),r.isElement(n.element)&&n.element.appendChild(n.canvas),n},i.run=function(t){!function o(r){t.frameRequestId=e(o),n(t,r),i.world(t,r),(t.options.showStats||t.options.showDebug)&&i.stats(t,t.context,r),(t.options.showPerformance||t.options.showDebug)&&i.performance(t,t.context,r)}()},i.stop=function(e){t(e.frameRequestId)},i.setPixelRatio=function(e,t){var n=e.options,i=e.canvas;"auto"===t&&(t=f(i)),n.pixelRatio=t,i.setAttribute("data-pixel-ratio",t),i.width=n.width*t,i.height=n.height*t,i.style.width=n.width+"px",i.style.height=n.height+"px"},i.lookAt=function(e,t,n,i){i=void 0===i||i,t=r.isArray(t)?t:[t],n=n||{x:0,y:0};for(var o={min:{x:1/0,y:1/0},max:{x:-1/0,y:-1/0}},a=0;a<t.length;a+=1){var s=t[a],l=s.bounds?s.bounds.min:s.min||s.position||s,c=s.bounds?s.bounds.max:s.max||s.position||s;l&&c&&(l.x<o.min.x&&(o.min.x=l.x),c.x>o.max.x&&(o.max.x=c.x),l.y<o.min.y&&(o.min.y=l.y),c.y>o.max.y&&(o.max.y=c.y))}var d=o.max.x-o.min.x+2*n.x,p=o.max.y-o.min.y+2*n.y,f=e.canvas.height,v=e.canvas.width/f,y=d/p,m=1,g=1;y>v?g=y/v:m=v/y,e.options.hasBounds=!0,e.bounds.min.x=o.min.x,e.bounds.max.x=o.min.x+d*m,e.bounds.min.y=o.min.y,e.bounds.max.y=o.min.y+p*g,i&&(e.bounds.min.x+=.5*d-d*m*.5,e.bounds.max.x+=.5*d-d*m*.5,e.bounds.min.y+=.5*p-p*g*.5,e.bounds.max.y+=.5*p-p*g*.5),e.bounds.min.x-=n.x,e.bounds.max.x-=n.x,e.bounds.min.y-=n.y,e.bounds.max.y-=n.y,e.mouse&&(u.setScale(e.mouse,{x:(e.bounds.max.x-e.bounds.min.x)/e.canvas.width,y:(e.bounds.max.y-e.bounds.min.y)/e.canvas.height}),u.setOffset(e.mouse,e.bounds.min))},i.startViewTransform=function(e){var t=e.bounds.max.x-e.bounds.min.x,n=e.bounds.max.y-e.bounds.min.y,i=t/e.options.width,o=n/e.options.height;e.context.setTransform(e.options.pixelRatio/i,0,0,e.options.pixelRatio/o,0,0),e.context.translate(-e.bounds.min.x,-e.bounds.min.y)},i.endViewTransform=function(e){e.context.setTransform(e.options.pixelRatio,0,0,e.options.pixelRatio,0,0)},i.world=function(e,t){var n,o=r.now(),d=e.engine,p=d.world,f=e.canvas,v=e.context,m=e.options,g=e.timing,x=a.allBodies(p),h=a.allConstraints(p),b=m.wireframes?m.wireframeBackground:m.background,S=[],w=[],A={timestamp:d.timing.timestamp};if(l.trigger(e,"beforeRender",A),e.currentBackground!==b&&y(e,b),v.globalCompositeOperation="source-in",v.fillStyle="transparent",v.fillRect(0,0,f.width,f.height),v.globalCompositeOperation="source-over",m.hasBounds){for(n=0;n<x.length;n++){var P=x[n];s.overlaps(P.bounds,e.bounds)&&S.push(P)}for(n=0;n<h.length;n++){var C=h[n],M=C.bodyA,B=C.bodyB,_=C.pointA,k=C.pointB;M&&(_=c.add(M.position,C.pointA)),B&&(k=c.add(B.position,C.pointB)),_&&k&&((s.contains(e.bounds,_)||s.contains(e.bounds,k))&&w.push(C))}i.startViewTransform(e),e.mouse&&(u.setScale(e.mouse,{x:(e.bounds.max.x-e.bounds.min.x)/e.options.width,y:(e.bounds.max.y-e.bounds.min.y)/e.options.height}),u.setOffset(e.mouse,e.bounds.min))}else w=h,S=x,1!==e.options.pixelRatio&&e.context.setTransform(e.options.pixelRatio,0,0,e.options.pixelRatio,0,0);!m.wireframes||d.enableSleeping&&m.showSleeping?i.bodies(e,S,v):(m.showConvexHulls&&i.bodyConvexHulls(e,S,v),i.bodyWireframes(e,S,v)),m.showBounds&&i.bodyBounds(e,S,v),(m.showAxes||m.showAngleIndicator)&&i.bodyAxes(e,S,v),m.showPositions&&i.bodyPositions(e,S,v),m.showVelocity&&i.bodyVelocity(e,S,v),m.showIds&&i.bodyIds(e,S,v),m.showSeparations&&i.separations(e,d.pairs.list,v),m.showCollisions&&i.collisions(e,d.pairs.list,v),m.showVertexNumbers&&i.vertexNumbers(e,S,v),m.showMousePosition&&i.mousePosition(e,e.mouse,v),i.constraints(w,v),m.hasBounds&&i.endViewTransform(e),l.trigger(e,"afterRender",A),g.lastElapsed=r.now()-o},i.stats=function(e,t,n){for(var i=e.engine,o=i.world,r=a.allBodies(o),s=0,l=0,c=0;c<r.length;c+=1)s+=r[c].parts.length;var u={Part:s,Body:r.length,Cons:a.allConstraints(o).length,Comp:a.allComposites(o).length,Pair:i.pairs.list.length};for(var d in t.fillStyle="#0e0f19",t.fillRect(l,0,302.5,44),t.font="12px Arial",t.textBaseline="top",t.textAlign="right",u){var p=u[d];t.fillStyle="#aaa",t.fillText(d,l+55,8),t.fillStyle="#eee",t.fillText(p,l+55,26),l+=55}},i.performance=function(e,t){var n=e.engine,o=e.timing,r=o.deltaHistory,a=o.elapsedHistory,s=o.timestampElapsedHistory,l=o.engineDeltaHistory,c=o.engineElapsedHistory,u=n.timing.lastDelta,p=d(r),f=d(a),v=d(l),y=d(c),m=d(s)/p||0,g=1e3/p||0;t.fillStyle="#0e0f19",t.fillRect(0,50,370,34),i.status(t,10,69,60,4,r.length,Math.round(g)+" fps",g/i._goodFps,(function(e){return r[e]/p-1})),i.status(t,82,69,60,4,l.length,u.toFixed(2)+" dt",i._goodDelta/u,(function(e){return l[e]/v-1})),i.status(t,154,69,60,4,c.length,y.toFixed(2)+" ut",1-y/i._goodFps,(function(e){return c[e]/y-1})),i.status(t,226,69,60,4,a.length,f.toFixed(2)+" rt",1-f/i._goodFps,(function(e){return a[e]/f-1})),i.status(t,298,69,60,4,s.length,m.toFixed(2)+" x",m*m*m,(function(e){return(s[e]/r[e]/m||0)-1}))},i.status=function(e,t,n,i,o,a,s,l,c){e.strokeStyle="#888",e.fillStyle="#444",e.lineWidth=1,e.fillRect(t,n+7,i,1),e.beginPath(),e.moveTo(t,n+7-o*r.clamp(.4*c(0),-2,2));for(var u=0;u<i;u+=1)e.lineTo(t+u,n+7-(u<a?o*r.clamp(.4*c(u),-2,2):0));e.stroke(),e.fillStyle="hsl("+r.clamp(25+95*l,0,120)+",100%,60%)",e.fillRect(t,n-7,4,4),e.font="12px Arial",e.textBaseline="middle",e.textAlign="right",e.fillStyle="#eee",e.fillText(s,t+i,n-5)},i.constraints=function(e,t){for(var n=t,i=0;i<e.length;i++){var o=e[i];if(o.render.visible&&o.pointA&&o.pointB){var a,s,l=o.bodyA,u=o.bodyB;if(a=l?c.add(l.position,o.pointA):o.pointA,"pin"===o.render.type)n.beginPath(),n.arc(a.x,a.y,3,0,2*Math.PI),n.closePath();else{if(s=u?c.add(u.position,o.pointB):o.pointB,n.beginPath(),n.moveTo(a.x,a.y),"spring"===o.render.type)for(var d,p=c.sub(s,a),f=c.perp(c.normalise(p)),v=Math.ceil(r.clamp(o.length/5,12,20)),y=1;y<v;y+=1)d=y%2==0?1:-1,n.lineTo(a.x+p.x*(y/v)+f.x*d*4,a.y+p.y*(y/v)+f.y*d*4);n.lineTo(s.x,s.y)}o.render.lineWidth&&(n.lineWidth=o.render.lineWidth,n.strokeStyle=o.render.strokeStyle,n.stroke()),o.render.anchors&&(n.fillStyle=o.render.strokeStyle,n.beginPath(),n.arc(a.x,a.y,3,0,2*Math.PI),n.arc(s.x,s.y,3,0,2*Math.PI),n.closePath(),n.fill())}}},i.bodies=function(e,t,n){var i,o,r,a,s=n,l=(e.engine,e.options),c=l.showInternalEdges||!l.wireframes;for(r=0;r<t.length;r++)if((i=t[r]).render.visible)for(a=i.parts.length>1?1:0;a<i.parts.length;a++)if((o=i.parts[a]).render.visible){if(l.showSleeping&&i.isSleeping?s.globalAlpha=.5*o.render.opacity:1!==o.render.opacity&&(s.globalAlpha=o.render.opacity),o.render.sprite&&o.render.sprite.texture&&!l.wireframes){var u=o.render.sprite,d=v(e,u.texture);s.translate(o.position.x,o.position.y),s.rotate(o.angle),s.drawImage(d,d.width*-u.xOffset*u.xScale,d.height*-u.yOffset*u.yScale,d.width*u.xScale,d.height*u.yScale),s.rotate(-o.angle),s.translate(-o.position.x,-o.position.y)}else{if(o.circleRadius)s.beginPath(),s.arc(o.position.x,o.position.y,o.circleRadius,0,2*Math.PI);else{s.beginPath(),s.moveTo(o.vertices[0].x,o.vertices[0].y);for(var p=1;p<o.vertices.length;p++)!o.vertices[p-1].isInternal||c?s.lineTo(o.vertices[p].x,o.vertices[p].y):s.moveTo(o.vertices[p].x,o.vertices[p].y),o.vertices[p].isInternal&&!c&&s.moveTo(o.vertices[(p+1)%o.vertices.length].x,o.vertices[(p+1)%o.vertices.length].y);s.lineTo(o.vertices[0].x,o.vertices[0].y),s.closePath()}l.wireframes?(s.lineWidth=1,s.strokeStyle="#bbb",s.stroke()):(s.fillStyle=o.render.fillStyle,o.render.lineWidth&&(s.lineWidth=o.render.lineWidth,s.strokeStyle=o.render.strokeStyle,s.stroke()),s.fill())}s.globalAlpha=1}},i.bodyWireframes=function(e,t,n){var i,o,r,a,s,l=n,c=e.options.showInternalEdges;for(l.beginPath(),r=0;r<t.length;r++)if((i=t[r]).render.visible)for(s=i.parts.length>1?1:0;s<i.parts.length;s++){for(o=i.parts[s],l.moveTo(o.vertices[0].x,o.vertices[0].y),a=1;a<o.vertices.length;a++)!o.vertices[a-1].isInternal||c?l.lineTo(o.vertices[a].x,o.vertices[a].y):l.moveTo(o.vertices[a].x,o.vertices[a].y),o.vertices[a].isInternal&&!c&&l.moveTo(o.vertices[(a+1)%o.vertices.length].x,o.vertices[(a+1)%o.vertices.length].y);l.lineTo(o.vertices[0].x,o.vertices[0].y)}l.lineWidth=1,l.strokeStyle="#bbb",l.stroke()},i.bodyConvexHulls=function(e,t,n){var i,o,r,a=n;for(a.beginPath(),o=0;o<t.length;o++)if((i=t[o]).render.visible&&1!==i.parts.length){for(a.moveTo(i.vertices[0].x,i.vertices[0].y),r=1;r<i.vertices.length;r++)a.lineTo(i.vertices[r].x,i.vertices[r].y);a.lineTo(i.vertices[0].x,i.vertices[0].y)}a.lineWidth=1,a.strokeStyle="rgba(255,255,255,0.2)",a.stroke()},i.vertexNumbers=function(e,t,n){var i,o,r,a=n;for(i=0;i<t.length;i++){var s=t[i].parts;for(r=s.length>1?1:0;r<s.length;r++){var l=s[r];for(o=0;o<l.vertices.length;o++)a.fillStyle="rgba(255,255,255,0.2)",a.fillText(i+"_"+o,l.position.x+.8*(l.vertices[o].x-l.position.x),l.position.y+.8*(l.vertices[o].y-l.position.y))}}},i.mousePosition=function(e,t,n){var i=n;i.fillStyle="rgba(255,255,255,0.8)",i.fillText(t.position.x+"  "+t.position.y,t.position.x+5,t.position.y-5)},i.bodyBounds=function(e,t,n){var i=n,o=(e.engine,e.options);i.beginPath();for(var r=0;r<t.length;r++){if(t[r].render.visible)for(var a=t[r].parts,s=a.length>1?1:0;s<a.length;s++){var l=a[s];i.rect(l.bounds.min.x,l.bounds.min.y,l.bounds.max.x-l.bounds.min.x,l.bounds.max.y-l.bounds.min.y)}}o.wireframes?i.strokeStyle="rgba(255,255,255,0.08)":i.strokeStyle="rgba(0,0,0,0.1)",i.lineWidth=1,i.stroke()},i.bodyAxes=function(e,t,n){var i,o,r,a,s=n,l=(e.engine,e.options);for(s.beginPath(),o=0;o<t.length;o++){var c=t[o],u=c.parts;if(c.render.visible)if(l.showAxes)for(r=u.length>1?1:0;r<u.length;r++)for(i=u[r],a=0;a<i.axes.length;a++){var d=i.axes[a];s.moveTo(i.position.x,i.position.y),s.lineTo(i.position.x+20*d.x,i.position.y+20*d.y)}else for(r=u.length>1?1:0;r<u.length;r++)for(i=u[r],a=0;a<i.axes.length;a++)s.moveTo(i.position.x,i.position.y),s.lineTo((i.vertices[0].x+i.vertices[i.vertices.length-1].x)/2,(i.vertices[0].y+i.vertices[i.vertices.length-1].y)/2)}l.wireframes?(s.strokeStyle="indianred",s.lineWidth=1):(s.strokeStyle="rgba(255, 255, 255, 0.4)",s.globalCompositeOperation="overlay",s.lineWidth=2),s.stroke(),s.globalCompositeOperation="source-over"},i.bodyPositions=function(e,t,n){var i,o,r,a,s=n,l=(e.engine,e.options);for(s.beginPath(),r=0;r<t.length;r++)if((i=t[r]).render.visible)for(a=0;a<i.parts.length;a++)o=i.parts[a],s.arc(o.position.x,o.position.y,3,0,2*Math.PI,!1),s.closePath();for(l.wireframes?s.fillStyle="indianred":s.fillStyle="rgba(0,0,0,0.5)",s.fill(),s.beginPath(),r=0;r<t.length;r++)(i=t[r]).render.visible&&(s.arc(i.positionPrev.x,i.positionPrev.y,2,0,2*Math.PI,!1),s.closePath());s.fillStyle="rgba(255,165,0,0.8)",s.fill()},i.bodyVelocity=function(e,t,n){var i=n;i.beginPath();for(var r=0;r<t.length;r++){var a=t[r];if(a.render.visible){var s=o.getVelocity(a);i.moveTo(a.position.x,a.position.y),i.lineTo(a.position.x+s.x,a.position.y+s.y)}}i.lineWidth=3,i.strokeStyle="cornflowerblue",i.stroke()},i.bodyIds=function(e,t,n){var i,o,r=n;for(i=0;i<t.length;i++)if(t[i].render.visible){var a=t[i].parts;for(o=a.length>1?1:0;o<a.length;o++){var s=a[o];r.font="12px Arial",r.fillStyle="rgba(255,255,255,0.5)",r.fillText(s.id,s.position.x+10,s.position.y-10)}}},i.collisions=function(e,t,n){var i,o,r,a,s=n,l=e.options;for(s.beginPath(),r=0;r<t.length;r++)if((i=t[r]).isActive)for(o=i.collision,a=0;a<i.activeContacts.length;a++){var c=i.activeContacts[a].vertex;s.rect(c.x-1.5,c.y-1.5,3.5,3.5)}for(l.wireframes?s.fillStyle="rgba(255,255,255,0.7)":s.fillStyle="orange",s.fill(),s.beginPath(),r=0;r<t.length;r++)if((i=t[r]).isActive&&(o=i.collision,i.activeContacts.length>0)){var u=i.activeContacts[0].vertex.x,d=i.activeContacts[0].vertex.y;2===i.activeContacts.length&&(u=(i.activeContacts[0].vertex.x+i.activeContacts[1].vertex.x)/2,d=(i.activeContacts[0].vertex.y+i.activeContacts[1].vertex.y)/2),o.bodyB===o.supports[0].body||!0===o.bodyA.isStatic?s.moveTo(u-8*o.normal.x,d-8*o.normal.y):s.moveTo(u+8*o.normal.x,d+8*o.normal.y),s.lineTo(u,d)}l.wireframes?s.strokeStyle="rgba(255,165,0,0.7)":s.strokeStyle="orange",s.lineWidth=1,s.stroke()},i.separations=function(e,t,n){var i,o,r,a,s,l=n,c=e.options;for(l.beginPath(),s=0;s<t.length;s++)if((i=t[s]).isActive){r=(o=i.collision).bodyA;var u=1;(a=o.bodyB).isStatic||r.isStatic||(u=.5),a.isStatic&&(u=0),l.moveTo(a.position.x,a.position.y),l.lineTo(a.position.x-o.penetration.x*u,a.position.y-o.penetration.y*u),u=1,a.isStatic||r.isStatic||(u=.5),r.isStatic&&(u=0),l.moveTo(r.position.x,r.position.y),l.lineTo(r.position.x+o.penetration.x*u,r.position.y+o.penetration.y*u)}c.wireframes?l.strokeStyle="rgba(255,165,0,0.5)":l.strokeStyle="orange",l.stroke()},i.inspector=function(e,t){e.engine;var n,i=e.selected,o=e.render,r=o.options;if(r.hasBounds){var a=o.bounds.max.x-o.bounds.min.x,s=o.bounds.max.y-o.bounds.min.y,l=a/o.options.width,c=s/o.options.height;t.scale(1/l,1/c),t.translate(-o.bounds.min.x,-o.bounds.min.y)}for(var u=0;u<i.length;u++){var d=i[u].data;switch(t.translate(.5,.5),t.lineWidth=1,t.strokeStyle="rgba(255,165,0,0.9)",t.setLineDash([1,2]),d.type){case"body":n=d.bounds,t.beginPath(),t.rect(Math.floor(n.min.x-3),Math.floor(n.min.y-3),Math.floor(n.max.x-n.min.x+6),Math.floor(n.max.y-n.min.y+6)),t.closePath(),t.stroke();break;case"constraint":var p=d.pointA;d.bodyA&&(p=d.pointB),t.beginPath(),t.arc(p.x,p.y,10,0,2*Math.PI),t.closePath(),t.stroke()}t.setLineDash([]),t.translate(-.5,-.5)}null!==e.selectStart&&(t.translate(.5,.5),t.lineWidth=1,t.strokeStyle="rgba(255,165,0,0.6)",t.fillStyle="rgba(255,165,0,0.1)",n=e.selectBounds,t.beginPath(),t.rect(Math.floor(n.min.x),Math.floor(n.min.y),Math.floor(n.max.x-n.min.x),Math.floor(n.max.y-n.min.y)),t.closePath(),t.stroke(),t.fill(),t.translate(-.5,-.5)),r.hasBounds&&t.setTransform(1,0,0,1,0,0)};var n=function(e,t){var n=e.engine,o=e.timing,r=o.historySize,a=n.timing.timestamp;o.delta=t-o.lastTime||i._goodDelta,o.lastTime=t,o.timestampElapsed=a-o.lastTimestamp||0,o.lastTimestamp=a,o.deltaHistory.unshift(o.delta),o.deltaHistory.length=Math.min(o.deltaHistory.length,r),o.engineDeltaHistory.unshift(n.timing.lastDelta),o.engineDeltaHistory.length=Math.min(o.engineDeltaHistory.length,r),o.timestampElapsedHistory.unshift(o.timestampElapsed),o.timestampElapsedHistory.length=Math.min(o.timestampElapsedHistory.length,r),o.engineElapsedHistory.unshift(n.timing.lastElapsed),o.engineElapsedHistory.length=Math.min(o.engineElapsedHistory.length,r),o.elapsedHistory.unshift(o.lastElapsed),o.elapsedHistory.length=Math.min(o.elapsedHistory.length,r)},d=function(e){for(var t=0,n=0;n<e.length;n+=1)t+=e[n];return t/e.length||0},p=function(e,t){var n=document.createElement("canvas");return n.width=e,n.height=t,n.oncontextmenu=function(){return!1},n.onselectstart=function(){return!1},n},f=function(e){var t=e.getContext("2d");return(window.devicePixelRatio||1)/(t.webkitBackingStorePixelRatio||t.mozBackingStorePixelRatio||t.msBackingStorePixelRatio||t.oBackingStorePixelRatio||t.backingStorePixelRatio||1)},v=function(e,t){var n=e.textures[t];return n||((n=e.textures[t]=new Image).src=t,n)},y=function(e,t){var n=t;/(jpg|gif|png)$/.test(t)&&(n="url("+t+")"),e.canvas.style.background=n,e.canvas.style.backgroundSize="contain",e.currentBackground=t}}()},function(e,t,n){var i={};e.exports=i;var o=n(5),r=n(17),a=n(0);!function(){var e,t,n;("undefined"!=typeof window&&(e=window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||window.msRequestAnimationFrame,t=window.cancelAnimationFrame||window.mozCancelAnimationFrame||window.webkitCancelAnimationFrame||window.msCancelAnimationFrame),e)||(e=function(e){n=setTimeout((function(){e(a.now())}),1e3/60)},t=function(){clearTimeout(n)});i.create=function(e){var t=a.extend({fps:60,deltaSampleSize:60,counterTimestamp:0,frameCounter:0,deltaHistory:[],timePrev:null,frameRequestId:null,isFixed:!1,enabled:!0},e);return t.delta=t.delta||1e3/t.fps,t.deltaMin=t.deltaMin||1e3/t.fps,t.deltaMax=t.deltaMax||1e3/(.5*t.fps),t.fps=1e3/t.delta,t},i.run=function(t,n){return void 0!==t.positionIterations&&(n=t,t=i.create()),function o(r){t.frameRequestId=e(o),r&&t.enabled&&i.tick(t,n,r)}(),t},i.tick=function(e,t,n){var i,a=t.timing;e.isFixed?i=e.delta:(i=n-e.timePrev||e.delta,e.timePrev=n,e.deltaHistory.push(i),e.deltaHistory=e.deltaHistory.slice(-e.deltaSampleSize),i=(i=(i=Math.min.apply(null,e.deltaHistory))<e.deltaMin?e.deltaMin:i)>e.deltaMax?e.deltaMax:i,e.delta=i);var s={timestamp:a.timestamp};o.trigger(e,"beforeTick",s),e.frameCounter+=1,n-e.counterTimestamp>=1e3&&(e.fps=e.frameCounter*((n-e.counterTimestamp)/1e3),e.counterTimestamp=n,e.frameCounter=0),o.trigger(e,"tick",s),o.trigger(e,"beforeUpdate",s),r.update(t,i),o.trigger(e,"afterUpdate",s),o.trigger(e,"afterTick",s)},i.stop=function(e){t(e.frameRequestId)},i.start=function(e,t){i.run(e,t)}}()},function(e,t,n){var i={};e.exports=i;var o=n(8),r=n(0).deprecated;i.collides=function(e,t){return o.collides(e,t)},r(i,"collides","SAT.collides ➤ replaced by Collision.collides")},function(e,t,n){var i={};e.exports=i;n(1);var o=n(0);i.pathToVertices=function(e,t){"undefined"==typeof window||"SVGPathSeg"in window||o.warn("Svg.pathToVertices: SVGPathSeg not defined, a polyfill is required.");var n,r,a,s,l,c,u,d,p,f,v,y=[],m=0,g=0,x=0;t=t||15;var h=function(e,t,n){var i=n%2==1&&n>1;if(!p||e!=p.x||t!=p.y){p&&i?(f=p.x,v=p.y):(f=0,v=0);var o={x:f+e,y:v+t};!i&&p||(p=o),y.push(o),g=f+e,x=v+t}},b=function(e){var t=e.pathSegTypeAsLetter.toUpperCase();if("Z"!==t){switch(t){case"M":case"L":case"T":case"C":case"S":case"Q":g=e.x,x=e.y;break;case"H":g=e.x;break;case"V":x=e.y}h(g,x,e.pathSegType)}};for(i._svgPathToAbsolute(e),a=e.getTotalLength(),c=[],n=0;n<e.pathSegList.numberOfItems;n+=1)c.push(e.pathSegList.getItem(n));for(u=c.concat();m<a;){if((l=c[e.getPathSegAtLength(m)])!=d){for(;u.length&&u[0]!=l;)b(u.shift());d=l}switch(l.pathSegTypeAsLetter.toUpperCase()){case"C":case"T":case"S":case"Q":case"A":s=e.getPointAtLength(m),h(s.x,s.y,0)}m+=t}for(n=0,r=u.length;n<r;++n)b(u[n]);return y},i._svgPathToAbsolute=function(e){for(var t,n,i,o,r,a,s=e.pathSegList,l=0,c=0,u=s.numberOfItems,d=0;d<u;++d){var p=s.getItem(d),f=p.pathSegTypeAsLetter;if(/[MLHVCSQTA]/.test(f))"x"in p&&(l=p.x),"y"in p&&(c=p.y);else switch("x1"in p&&(i=l+p.x1),"x2"in p&&(r=l+p.x2),"y1"in p&&(o=c+p.y1),"y2"in p&&(a=c+p.y2),"x"in p&&(l+=p.x),"y"in p&&(c+=p.y),f){case"m":s.replaceItem(e.createSVGPathSegMovetoAbs(l,c),d);break;case"l":s.replaceItem(e.createSVGPathSegLinetoAbs(l,c),d);break;case"h":s.replaceItem(e.createSVGPathSegLinetoHorizontalAbs(l),d);break;case"v":s.replaceItem(e.createSVGPathSegLinetoVerticalAbs(c),d);break;case"c":s.replaceItem(e.createSVGPathSegCurvetoCubicAbs(l,c,i,o,r,a),d);break;case"s":s.replaceItem(e.createSVGPathSegCurvetoCubicSmoothAbs(l,c,r,a),d);break;case"q":s.replaceItem(e.createSVGPathSegCurvetoQuadraticAbs(l,c,i,o),d);break;case"t":s.replaceItem(e.createSVGPathSegCurvetoQuadraticSmoothAbs(l,c),d);break;case"a":s.replaceItem(e.createSVGPathSegArcAbs(l,c,p.r1,p.r2,p.angle,p.largeArcFlag,p.sweepFlag),d);break;case"z":case"Z":l=t,c=n}"M"!=f&&"m"!=f||(t=l,n=c)}}},function(e,t,n){var i={};e.exports=i;var o=n(6);n(0);i.create=o.create,i.add=o.add,i.remove=o.remove,i.clear=o.clear,i.addComposite=o.addComposite,i.addBody=o.addBody,i.addConstraint=o.addConstraint}])}));
\ No newline at end of file
diff --git a/static/js/meow.js b/static/js/meow.js
new file mode 100644
index 0000000..0baa817
--- /dev/null
+++ b/static/js/meow.js
@@ -0,0 +1,226 @@
+const Matter = window.Matter;
+
+function findNearestBlock(elem) {
+  if(elem === null || elem === document.body) return null;
+  const styleSet = getComputedStyle(elem);
+  if(elem.tagName !== 'svg' && styleSet['display'] !== 'inline') return elem;
+  return findNearestBlock(elem.parentNode);
+}
+
+function bootstrap() {
+  const engine = Matter.Engine.create({
+    gravity: {
+      x: 0,
+      y: -0.1,
+    }
+  });
+  const floatings = new Map();
+
+  // Create walls
+  let walls = null;
+  function buildWalls() {
+    const WALL_DEPTH = 10000;
+    const topWall = Matter.Bodies.rectangle(
+      window.innerWidth / 2 + window.scrollX, 
+      -WALL_DEPTH / 2 + window.scrollY,
+      window.innerWidth + 2 * WALL_DEPTH,
+      WALL_DEPTH,
+      {
+        isStatic: true,
+        restitution: 0.8,
+      }
+    );
+
+    const bottomWall = Matter.Bodies.rectangle(
+      window.innerWidth / 2 + window.scrollX,
+      window.innerHeight + WALL_DEPTH / 2 + window.scrollY,
+      window.innerWidth + 2 * WALL_DEPTH,
+      WALL_DEPTH,
+      {
+        isStatic: true,
+        restitution: 0.8,
+      }
+    );
+    
+    const leftWall = Matter.Bodies.rectangle(
+      -WALL_DEPTH / 2 + window.scrollX,
+      window.innerHeight / 2 + window.scrollY,
+      WALL_DEPTH,
+      window.innerHeight + 2 * WALL_DEPTH,
+      {
+        isStatic: true,
+        restitution: 0.8,
+      }
+    );
+    
+    const rightWall = Matter.Bodies.rectangle(
+      window.innerWidth + WALL_DEPTH / 2 + window.scrollX,
+      window.innerHeight / 2 + window.scrollY,
+      WALL_DEPTH,
+      window.innerHeight + 2 * WALL_DEPTH,
+      {
+        isStatic: true,
+        restitution: 0.8,
+      }
+    );
+
+    if(walls) Matter.Composite.remove(engine.world, walls);
+    walls = Matter.Composite.create();
+    Matter.Composite.add(walls, [topWall, bottomWall, leftWall, rightWall]);
+    Matter.Composite.add(engine.world, walls);
+  }
+
+  buildWalls();
+  window.addEventListener('resize', buildWalls);
+
+  // Create overlay
+  const overlay = document.createElement('div');
+  overlay.style.position = 'fixed';
+  overlay.style.left = 0;
+  overlay.style.top = 0;
+  overlay.style.width = '100vw';
+  overlay.style.height = '100vh';
+  overlay.style['pointer-events'] = 'none';
+  document.body.appendChild(overlay);
+
+  // const bounds = Matter.Bounds.create([{ x: 0, y: 0 }, { x: window.innerWidth, y: window.innerHeight }]);
+
+  /*
+  const debugRender = Matter.Render.create({
+    element: overlay,
+    engine,
+    bounds,
+    options: {
+      background: 'transparent',
+      wireframeBackground: 'transparent',
+      width: window.innerWidth,
+      height: window.innerHeight,
+      hasBounds: true,
+    },
+  });
+  Matter.Render.run(debugRender);
+  */
+
+  let lastRender = performance.now();
+  let lastScrollX = window.scrollX;
+  let lastScrollY = window.scrollY;
+  let lastScreenX = window.screenX;
+  let lastScreenY = window.screenY;
+  function render(ts) {
+    const diff = ts - lastRender;
+    lastRender = ts;
+
+    const curScrollX = window.scrollX;
+    const curScrollY = window.scrollY;
+
+    if(walls)
+      Matter.Composite.translate(walls, {
+        x: curScrollX - lastScrollX,
+        y: curScrollY - lastScrollY,
+      });
+    
+    const diffScreenX = window.screenX - lastScreenX;
+    const diffScreenY = window.screenY - lastScreenY;
+    for(const body of engine.world.bodies) {
+      if(body === walls) continue;
+      Matter.Body.translate(body, {
+        x: -diffScreenX,
+        y: -diffScreenY,
+      });
+    }
+    lastScreenX = window.screenX;
+    lastScreenY = window.screenY;
+
+    /*
+    Matter.Bounds.translate(bounds, {
+      x: curScrollX - lastScrollX,
+      y: curScrollY - lastScrollY,
+    });
+    */
+
+    lastScrollX = curScrollX;
+    lastScrollY = curScrollY;
+
+    Matter.Engine.update(engine, diff);
+
+    const bodies = Matter.Composite.allBodies(engine.world);
+    for(const body of bodies) {
+      const id = body.id;
+      const query = floatings.get(id);
+      if(!query) continue;
+      const [floating, width, height] = query;
+      if(!floating || !floating.offsetParent) {
+        // DOM is removed
+        floatings.delete(id);
+        Matter.Composite.remove(engine.world, body);
+        continue;
+      }
+
+      const { top, left } = floating.offsetParent.getBoundingClientRect();
+      const x = left + floating.offsetLeft + width / 2;
+      const y = top + floating.offsetTop + height / 2;
+      const toX = body.position.x - curScrollX;
+      const toY = body.position.y - curScrollY;
+      const rotation = body.angle;
+
+      floating.style.transform = `translate(${toX - x}px, ${toY - y}px) rotate(${rotation}rad)`;
+      // floating.style.setProperty('--inverse', `rotate(${-rotation}rad) translate(${- toX + x}px, ${- toY + y}px)`);
+    }
+
+    requestAnimationFrame(render);
+  }
+  requestAnimationFrame(render);
+
+  document.body.addEventListener('click', e => {
+    const floating = findNearestBlock(e.target);
+    if(floating.classList.contains('meow-floating')) return true;
+    // filter if has floating childern
+    if(floating.querySelector('.meow-floating')) return true;
+    e.preventDefault();
+    e.stopImmediatePropagation();
+
+    // Flush
+    const computed = getComputedStyle(floating);
+    // const width = computed.width;
+    // const height = computed.height;
+
+    const { top, left, width, height } = floating.getBoundingClientRect();
+    if(height > 600) return true;
+    const scrollX = window.scrollX;
+    const scrollY = window.scrollY;
+
+    const worldX = scrollX + left;
+    const worldY = scrollY + top;
+
+    floating.style.setProperty('--real-width', `${width}px`);
+    floating.style.setProperty('--real-height', `${height}px`);
+
+    const box = Matter.Bodies.rectangle(worldX + width / 2, worldY + height / 2, width, height, { restitution: 0.8 });
+    const id = box.id;
+
+    // Apply random velocity at start
+    const initVelX = Math.random() * 0.5 - 0.25;
+    const initVelY = Math.random() * 0.5 - 0.25;
+    const initVelAng = Math.random() * 0.01 - 0.005;
+    Matter.Body.setVelocity(box, { x: initVelX, y: initVelY });
+    Matter.Body.setAngularVelocity(box, initVelAng);
+
+    floating.classList.add('meow-floating');
+    // Hacks for popovers
+    const triggers = floating.querySelectorAll('a[data-toggle=popover]');
+    for(const a of triggers) {
+      a.addEventListener('mouseover', e => {
+        e.stopImmediatePropagation();
+      }, true);
+    }
+    const popovers = floating.querySelectorAll('.popover');
+    for(const popover of popovers) popover.remove();
+
+    floatings.set(id, [floating, width, height]);
+    Matter.Composite.add(engine.world, box);
+
+    return false;
+  }, true);
+}
+
+document.body.onload = bootstrap;
\ No newline at end of file