From 69c0972c81c60f47217a6e345b6e01b73de41af4 Mon Sep 17 00:00:00 2001
From: nsfisis <nsfisis@gmail.com>
Date: Wed, 31 Jan 2024 23:40:27 +0900
Subject: add files

---
 pw0.rb | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 pw0.rb

(limited to 'pw0.rb')

diff --git a/pw0.rb b/pw0.rb
new file mode 100644
index 0000000..35e1303
--- /dev/null
+++ b/pw0.rb
@@ -0,0 +1,68 @@
+eval(s=(%w@
+  q=$*[0]&.to_i;
+
+  z="eval(s=(%w#{64.chr}#{s}##{s*9}#{64.chr}.join))";
+
+  h=25;w=80;
+  px=2;py=h/2;
+  vx=0.5;vy=-0.5;
+  qx=w-3;qy=h/2;
+  ux=-0.5;uy=0.5;
+
+  b=Array.new(h*w){|i|
+    y=i/w;
+    x=i%w;
+    (x==0||x==w-1||y==0||y==h-1)?2:(w/2<x)?1:0
+  };
+
+  f=->(x,y,vx,vy,c){
+    sx=vx;sy=vy;
+    8.times{|i|
+      t=i*Math::PI/4;
+      cos=Math.cos(t);
+      sin=Math.sin(t);
+      nx=x+cos/2;
+      ny=y+sin/2;
+      k=ny.to_i*w+nx.to_i;
+      if(0<=nx&&nx<w&&0<=ny&&ny<h&&b[k]!=c);
+        b[k]==2?0:b[k]=c;
+        (sin.abs<cos.abs)?sx*=-1:sy*=-1;
+      end
+    };
+    [sx,sy]
+  };
+  g=->(x,y,vx,vy){
+    [(x+vx<0||w<=x+vx)?-vx:vx,(y+vy<0||h<=y+vy)?-vy:vy]
+  };
+
+  j=0;
+  loop{
+    j+=1;
+    (vx,vy=f[px,py,vx,vy,0]);
+    (vx,vy=g[px,py,vx,vy]);
+    px+=vx;
+    py+=vy;
+    (ux,uy=f[qx,qy,ux,uy,1]);
+    (ux,uy=g[qx,qy,ux,uy]);
+    qx+=ux;
+    qy+=uy;
+    q&&((q<j)?(break):(q!=j)?(next):0);
+    q||(print"\e[H\e[2J");
+    c=[];
+    h.times{|y|
+      w.times{|x|
+        c<<!(b[y*w+x]==0&&[px.to_i,py.to_i]!=[x,y]||[qx.to_i,qy.to_i]==[x,y])
+      };
+    };
+    t=c.count(!!0);
+    i=0;
+    h.times{|y|
+      w.times{|x|
+        print((y==h-1&&x>=w-8)?"#{64.chr}.join))"[8+x-w]:c[y*w+x]?[z[i],i+=1][0]:32.chr)
+      };
+      puts;
+    };
+    sleep(0.05);
+  }
+
+@.join))
-- 
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