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              html, body, canvas
	height: 100%
	width: 100%
	margin: 0

body
	background: #020c04

canvas
	position: absolute
	top: 50%
	left: 50%
	transform: translate(-50%, -50%)
	max-width: 640px
	max-height: 480px
	border: 36px solid #010301
	box-shadow: 0 0 48px 8px #010301

            
          
!
            
              const HORIZON_Y = 0.8;
const SPACING_Y = 2.2;
const SPACING_X = 32;
const SPACING_SCANLINES = 12;
const SKEW = 7;
const ACCELERATION = 0.005;
const X_DECELERATION = 0.002;
const MAX_Y_SPEED = 0.2;
const MIN_Y_SPEED = 0.02;
const MAX_X_SPEED = 0.1;
const P_GLITCH = 0.002;
const GLITCH_PAUSE_DURATION = [300, 800]; // min, max in ms.
const COLOR = [55, 255, 55];
const TITLE = 'CYBER PILOT';

const dynamicCtx = document.createElement('canvas').getContext('2d');
const staticCtx  = document.createElement('canvas').getContext('2d');
const screenCtx  = document.createElement('canvas').getContext('2d');
const ctxs = [dynamicCtx, staticCtx, screenCtx];

// Define and hydrate the state.
// The rest is filled onResize.
const state = {
	keys: {},
    ySpeed: MIN_Y_SPEED,
	xSpeed: 0,
    glitched: false,
    yOffset: 0,
    xOffset: 0,
};

function onResize () {
    const h = state.h = Math.min(480, window.innerHeight) * 2;
    const w = state.w = Math.min(640, window.innerWidth) * 2;
    const y0 = state.y0 = h * (1 - HORIZON_Y);
    state.nHorizontal =
        Math.pow((h * HORIZON_Y), 1 / SPACING_Y);
    state.nVertical = Math.ceil(w / SPACING_X);
    state.nScanlines = Math.ceil(h / SPACING_SCANLINES);
    
    // Update the DOM.
    ctxs.forEach(ctx => {
        ctx.canvas.height = state.h;
        ctx.canvas.width = state.w;
    });
    
    drawStatic();
};

function drawStatic () {
    const {h, w, y0, nVertical} = state;
    const ctx = staticCtx;
    
    ctx.clearRect(0, 0, w, h);
    
    // Fade the lines on the wall.
    const fade = ctx.createLinearGradient(0, 0, 0, y0);
    fade.addColorStop(0.0, 'rgba(0, 0, 0, 1)');
    fade.addColorStop(0.5, 'rgba(0, 0, 0, 0.65)');
    fade.addColorStop(1.0, 'rgba(0, 0, 0, 0)');
    ctx.fillStyle = fade;
    ctx.fillRect(0, 0, w, y0);

    // Draw title.
    ctx.textAlign = 'center';
    ctx.textBaseline = 'middle';
    ctx.fillStyle = `rgba(${COLOR}, ${1/3})`;
    ctx.font = 'bold 20pt "Monoton", monospace';
    ctx.fillText(TITLE, w/2, y0/3.3);
    ctx.fillStyle = `rgba(${COLOR}, ${2/3})`;
    ctx.font = 'bold 30pt "Monoton", monospace';
    ctx.fillText(TITLE, w/2, y0/2.6);
    ctx.fillStyle = `rgba(${COLOR}, 1)`;
    ctx.font = 'bold 56pt "Monoton", monospace';
    ctx.fillText(TITLE, w/2, y0/1.8);
    
    drawScreenArtifacts();
}

function drawScreenArtifacts () {
    const {h, w} = state;
    const ctx = screenCtx;
    
    ctx.clearRect(0, 0, w, h);
    
    // Draw scanlines.
    const strokeOptions = {
        c1: 'rgba(44, 74, 44, 0.16)',
        c2: 'rgba(0, 10, 0, 0.16)',
    };
    for (let n = 0; n < state.nScanlines; ++n) {
        const y = n * SPACING_SCANLINES;
        ctx.beginPath();
        ctx.moveTo(0, y);
        ctx.lineTo(w, y);
        stroke(ctx, strokeOptions);
    }
    
    // Draw glow.
    ctx.beginPath();
    const glow = ctx.createRadialGradient(
        w / 2, h / 2, Math.max(w, h),
        w / 2, h / 2, SPACING_X * 1.5
    );
    glow.addColorStop(0.2, 'rgba(0, 0, 0, 0.16)');
    glow.addColorStop(1.0, `rgba(${COLOR}, 0.16)`);
    ctx.fillStyle = glow;
    ctx.fillRect(0, 0, w, h);
}

function drawDynamic () {
    const {h, w, y0, xSpeed, nVertical, nHorizontal, yOffset, xOffset} = state;
    const ctx = dynamicCtx;
    
    ctx.clearRect(0, 0, w, h);
    
    // Draw vertical lines.
    for (let n = 0; n <= nVertical; ++n) {
        ctx.beginPath();
        const x = (nVertical/2 - n);
        const x1 = (x + xOffset) * SPACING_X + w/2;
        const x2 = (x + xOffset) * SPACING_X * SKEW + w/2;
        ctx.beginPath();
        ctx.moveTo(x1, 0);
        ctx.lineTo(x1, y0);
        ctx.lineTo(x2, h);
        stroke(ctx);
    }
    
    // Draw horizontal lines.
    for (let n = 0; n < nHorizontal; n++) {
        const y = y0 + 2 + Math.pow(n + yOffset, SPACING_Y);
        ctx.beginPath();
        ctx.moveTo(0, y);
        ctx.lineTo(w, y);
        stroke(ctx);
    }
	
	// Draw spaceship.
	const tilt = -xSpeed/MAX_X_SPEED * Math.PI/6;
    ctx.beginPath();
    ctx.arc(w / 2, h / 2, SPACING_X * 1.5, tilt + Math.PI*5/16, tilt + Math.PI*11/16);
    ctx.lineTo(w / 2, h / 2);
    ctx.closePath();
    stroke(ctx);
}

function tick () {
    requestAnimationFrame(tick);
	
	const {keys, glitched, yOffset, xOffset} = state;
	let {ySpeed, xSpeed} = state;
	if (keys[37]) xSpeed += ACCELERATION;
    if (keys[38]) ySpeed += ACCELERATION;
    if (keys[39]) xSpeed -= ACCELERATION;
    if (keys[40]) ySpeed -= ACCELERATION;
	const xSpeedAbs = Math.abs(Math.min(MAX_X_SPEED, ySpeed, Math.max(-MAX_X_SPEED, -ySpeed, xSpeed)));
    state.ySpeed = Math.min(MAX_Y_SPEED, Math.max(MIN_Y_SPEED, ySpeed));
    state.xSpeed = Math.sign(xSpeed) * (xSpeedAbs - Math.min(xSpeedAbs, X_DECELERATION));
    state.yOffset = (yOffset + ySpeed) % 1;
	state.xOffset = (xOffset + xSpeed + 1) % 1;

    if (glitched) return;
    drawDynamic();
    
    if (Math.random() > P_GLITCH) return;
    drawGlitch();
}

function drawGlitch () {
    const {w, h} = state;
      
    dynamicCtx.drawImage(staticCtx.canvas, 0, 0);
    staticCtx.clearRect(0, 0, w, h);
    
    const fullImageData = dynamicCtx.getImageData(0, 0, w, h);
    const glitchOptions = {
        quality: 4,
        amount: 0,
        iterations: 2,
    };
    glitch(glitchOptions)
        .fromImageData(fullImageData)
        .toImageData()
        .then(imageData => {
            dynamicCtx.clearRect(0, 0, w, h);
            dynamicCtx.putImageData(imageData, 0, 0);
        })
        ;
    
    state.glitched = true;
    
    const [minDelay, maxDelay] = GLITCH_PAUSE_DURATION;
    const delay = minDelay + Math.random() * (maxDelay - minDelay);
    setTimeout(_ => {
        drawStatic();
        state.glitched = false;
    }, delay);
}

window.addEventListener('resize', throttle(onResize));
document.addEventListener('keydown', ({keyCode}) =>
	state.keys[keyCode] || (state.keys[keyCode] = true));
document.addEventListener('keyup', ({keyCode}) =>
	state.keys[keyCode] && (state.keys[keyCode] = false));

// Kick it off!
WebFont.load({
    active: function () {
        onResize();
        tick();
        ctxs.forEach(({canvas}) => {
            document.body.appendChild(canvas);
        });
    },
    classes: false,
    google: {
        families: ['Monoton'],
    },
});

// A thin white line gives us a nice glow-y effect.
function stroke (ctx, {
    w1 = 10,
    w2 = 2,
    c1 = `rgba(${COLOR}, 0.5)`,
    c2 = `rgb(${COLOR})`,
} = {}) {
    ctx.lineWidth = w1;
    ctx.strokeStyle = c1;
    ctx.stroke();
    ctx.lineWidth = w2;
    ctx.strokeStyle = c2;
    ctx.stroke();
}

// Throttles a function to RAF.
function throttle (cb) {
    let queued = false;
    
    return (...args) => {
        if (queued) return;
        
        queued = true;
        requestAnimationFrame(_ => {
            queued = false;
            cb(...args);
        });
    };
}

            
          
!
999px
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