JS1k: The JavaScript code golfing competition

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// http://en.wikipedia.org/wiki/Pi_Day
var xpos = 0, d = new Date('3/14/1848');

function clear() {
    b.style.background = 'black';
    c.width = c.height = 704;
    a.fillStyle = 'white';
    a.strokeStyle = 'white';
    a.translate(703.5, 0.5);
}

function grass() {
    a.save();
    a.fillStyle = '#0c0';
    a.fillRect(0, 128, -704, 128);
    a.restore();
}

function circle() {
    a.save();
    a.translate(-32, 96);
    a.rotate(-xpos / 16);
    a.beginPath();
    a.arc(0, 0, 32, 0, 2 * Math.PI, false);
    a.lineWidth = 3;
    a.strokeStyle = '#c90';
    a.stroke();
    for(var i = 0; i < 8; ++i) {  // Spokes
        if(i == 0) {
            a.strokeStyle = 'red';
        } else {
            a.strokeStyle = '#c90';
        }
        a.beginPath();
        a.moveTo(0, 0);
        a.lineTo(0, 32);
        a.stroke();
        a.rotate(Math.PI / 4);
    }
    a.beginPath();
    a.arc(0, 0, 8, 0, 2 * Math.PI, false);
    a.fillStyle = 'black';
    a.fill();
    a.stroke();
    a.restore();
}

function landmarks() {
    // draw only visible landmarks
    var min = Math.floor((xpos - 32) / (Math.PI * 32)), max = min + 9;
    for(var i = min, j = 0; i < max; ++i) {
        a.save();
        a.translate(i * Math.PI * -32 - 32 + xpos, 128);
        a.fillRect(-2, -64, 2, 64);
        a.strokeRect(0, -64, 32, 16);
        a.fillText(i + 'π', 8, -52);
        a.restore();
    }
}

function status() {
    a.fillRect(-704, 288, 704, 224);
    a.fillStyle = 'black';
    d = new Date(d.getTime() + 4230000);
    a.font = "bold 24px Lucida Console";
    ['          Date: ' + d.toDateString(), // Tue Mar 14 1848
     '       Weather: ' + 'coolwarmhot'.substr(Math.min(Math.floor(d.getMonth() / 2 - 0.5) * 4, 8), 4),
     '        Health: ' + 'goodfairpoorfair'.substr(Math.floor(d.getTime() / 1e9) % 4 * 4, 4),
     '          Food: ' + (Math.PI * 100000 - xpos / 32).toFixed(0) + ' pounds',  // 314159 pounds
     ' Next landmark: ' + (Math.PI - (xpos / 32) % Math.PI).toFixed(2) + ' miles',  // 3.14 miles
     'Miles traveled: ' + (xpos / 32).toFixed(2) + ' miles'].map(function(v, i) {
         a.fillText('        ' + v, -704, 320 + 32 * i);
     });
}

function animate() {
    clear();
    grass();
    circle();
    landmarks();
    status();
    ++xpos;
}
animate(); // Keep 314159 on screen for some time
setTimeout(function() {
    setInterval(animate, 100);
}, 1500);