JS1k: The JavaScript code golfing competition

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// Lava Mine by fishtastic for js1k2019
// Compressed with closure compile + regpack js
// http://siorki.github.io/regPack.html

// aA a canvas
// bB body. B board of blocks as a 2D arr
// cC c canvas context,
// dD D, copied board as an array of [x,y,i,j]
// eE
// fF F frame counter
// gG
// hH H viewport height
// iI i temp variable, I = init
// jJ j temp variable, J = jump allowed
// kK k temp variable, K key input
// lL l temp variable, L = lava height;
// mM m temp variable
// nN n temp variable
// oO o temp variable
// pP p player on top of platform, P = player radius
// qQ
// rR R radius of block
// sS S start the main loop
// tT
// uU
// vV v lava height (temp)
// wW W width (in number of blocks)
// xX x playerX, X velocityX
// yY y playerY, Y velocityY
// zZ z camera x, camera y

// This is just for closure compiler.
var z,Z,J,X,Y,i,j,k,l,g,m,n,o,x,y,p,v,D,G,B,I,L,F,K;

z=Z=J=X=Y=0;
K = [];
const W = 64;
const H = 32*3;

// Block radius in pixels
const R = 32; // blocks radius
const P = R/2; // player block radius

I = () => {
  F = 0;
  L = H*R;
  B=[];
  for (i=0;i<H;i++) {
    B.push(k=[]);
    for(j=0;j<W;j++)
      k.push((Math.random()<.5 || j==0 || i>H-9 || j==W-1)&&640);
  }

  for (k=0;k<2;k++) {
    D=JSON.parse(JSON.stringify(B));
    for (i=1;i<H-1;i++) {
      for (j=1;j<W-1;j++) {
        o=0;
        for (l=-1;l<=1;l++) {
          for (m=-1;m<=1;m++) {
            o+=!!B[i+l][j+m];
          }
        }
        // Add opacity to generated blocks
        D[i][j]=(o>4)*Math.random()*5+(o-1)*(o>4);

        if (o<4) {
          z=x=j*R;
          Z=y=i*R;
        }
      }
    }
    B=D;
  }
}
I();

b.onkeydown=e=>{
  K[e.keyCode]=K[e.keyCode]||!e.repeat;
};
b.onkeyup=e=>{
  K[e.keyCode]=0;
};

setInterval(() => {
  F++;
  c.clearRect(0,0,1024,640);

  D=[];
  for (i=0;i<H;i++)
    for(j=0;j<W;j++)
      if (B[i][j]>0 && Math.abs(i*R-Z)<640) // optimization to not render off screen stuff
        D.push([j*R,i*R,i,j]);

  x+=X;
  y+=Y;

  // Gravity
  Y+=.15;

  // Air resistance/friction
  Y*=.98;
  X*=.98;

  // Player on a platform/friction bonus
  p=0;

  // Okay to dig left/right
  o=0;

  // Main logic loop
  for ([i,j,k,l] of D) {
    m=B[k][l];
    if (m>0) {
      c.fillStyle = "#321";
      c.globalAlpha = Math.min(1,.6+m*.05);
      c.fillRect(i-z,j-Z,R+1,R+1);
    }

    // Has collision
    if (x>i-P && x<i+R && y>j-P && y<j+R) {
      // Resolve collision.
      if (Math.min(y+P-j, j-y+R) > Math.min(x+P-i, i-x+R)) {
        if (x-i > R/2-P/2) {
          // Right side
          x = i+R;
          if (X<0) X = 0;
        } else {
          // Left
          x = i-P;
          if (X>0) X = 0;
        }
        [n,o]=[k,l];
      } else {
        if (y-j > R/2-P/2) {
          // Bottom
          y = j+R;
          if (Y<0) Y = 0;
          B[k][l]--; // bumping on block from the bottom digs it little a bit
        } else {
          // Top
          y = j-P;
          if (Y>0) Y = 0;

          J=9;
          p=1.5;
          X*=.5; // Friction
        }
      }
    }
  }

  // Jump
  if(J-->0 && K[38]) {
    K[38]=J=0;
    Y-=6;
  }

  if(K[37]) { // left
    X-=p+0.1;
  }
  if (K[39]) { // right
    X+=p+0.1;
  }
  if ((K[37] || K[39]) && o) {
    // dig
    B[n][o] = Math.max(0, B[n][o]-.5);
  }

  // Camera
  z=Math.max(x-1024/2,0);
  z=Math.min(z,W*R-1024);
  Z=Math.min(y-640/2,H*R-640);

  // Lava  
  L = Math.min(L-.1-F/1024/32, y+320);
  v = L - Math.sin(F/32)*9;

  c.fillStyle = "#080";
  c.fillRect(x-z,y-Z,P,P);
  c.fillStyle = "#f40";
  c.fillRect(0,v-Z,1024,640);

  if (y<0 || y+P>v) return I(); // dead or win from lava
},20);