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index.html
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<!DOCTYPE html>
<html lang="en-US">
<head>
<title>starfield</title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta name="robots" content="follow index archive" />
<meta name="author" content="REZ ᕕ( ᐛ )ᕗ" />
<meta name="description" content="interactive code tutorial" />
<link rel="preload" href="starfield.css" as="style" type="text/css" />
<link rel="preload" href="fonts/microgramma.woff2" as="font" type="font/woff2" crossorigin="anonymous" />
<link rel="preload" href="fonts/chakra_petch.ttf" as="font" type="font/ttf" crossorigin="anonymous" />
<link rel="preload" href="fonts/hud.woff2" as="font" type="font/woff2" crossorigin="anonymous" />
<link rel="stylesheet" href="starfield.css" />
<script type="application/javascript" src="starfield.js"></script>
</head>
<body onload="init()">
<div id="root">
<div id="header">
<img id="logo" />
<div id="title">
starfield<img id="cute_star" /><br />
<div id="subtitle">an interactive tutorial</div>
</div>
<div id="credits">
<div>rez</div>
<a href="https://github.com/chiptune/starfield">github</a>
<div id="version"></div>
</div>
</div>
<div id="content">
<div id="menu">
<div id="steps"></div>
<div id="options">
<button onclick="randomize()">random</button>
<button onclick="reset()">reset</button>
<button onclick="center()">center</button>
</div>
<div id="config">
<form>
<label for="motion">motion</label>
<input type="checkbox" id="motion" />
</form>
<form>
<label for="spikes">spikes</label>
<input type="checkbox" id="spikes" />
</form>
<form>
<label for="crt">crt</label>
<input type="checkbox" id="crt" />
</form>
<form>
<label for="nocode">code</label>
<input type="checkbox" id="nocode" />
</form>
<form>
<label for="novars">vars</label>
<input type="checkbox" id="novars" />
</form>
<form>
<label for="debug">debug</label>
<input type="checkbox" id="debug" />
</form>
</div>
</div>
<div id="visual">
<canvas id="starfield"></canvas>
<div id="variables"></div>
</div>
<code><div></div></code>
</div>
</div>
</body>
</html>
<script type="application/javascript" id="step0">
step0_draw = () => {
"use strict"; // REM
const { ctx, dpr, ox, oy, px, py, vx, vy, w, h, _w, drag, drago } = sfo; // REM
let x, y; // REM
sfo.translate(); // REM
x = ox + (drago ? px : 0); // REM
y = oy + (drago ? py : 0); // REM
ctx.fillStyle = "#000";
ctx.fillRect(-x, -y, w, h); // REM
//ctx.fillRect(-w / 2, -h / 2, w, h); // NREM
/* display a cute star here */
x = (drag ? vx + px : vx) - _w / 4; // REM
y = (drag ? vy + py : vy) - _w / 4; // REM
const cute_star = generate_cute_star(_w, Math.sin((Math.PI / 128) * _w) / 4); // REM
ctx.drawImage(cute_star, 0, 0, _w * dpr, _w * dpr, x, y, _w / 2, _w / 2); // REM
sfo.crt_draw(); // REM
sfo.debug_draw(); // REM
sfo.delta = sfo.time; // REM
sfo.time = performance.now(); // REM
sfo.tick(step0_draw); // REM
};
// # README #
// Use the mouse to move the stars (click + drag)
// and the mousewheel to change the distance.
// Use shift + drag to move the world origin.
// # SHORTCUTS #
// V: show/hide variables
// C: show/hide code
// F: fullscreen on/off (Escape to exit)
// P / enter: animation play/pause
// R: randomize star positions
// S: show/hide spikes
// X: reset all parameters
// X + shift: reset word origin
// O: crt on/off
// D: debug mode on/off
// Arrow up/down: cycle through steps
// # SOURCE #
// github.com/chiptune/starfield
</script>
<script type="application/javascript" id="step1">
step1_init = () => {
"use strict"; // REM
const { stars, vx, vy, _nb, _w } = sfo; // REM
for (let i = 0; i < _nb; i++) {
stars[i] = new Float32Array(2);
stars[i][0] = vx + (lcg() - 0.5) * _w;
stars[i][1] = vy + (lcg() - 0.5) * _w;
}
};
step1_draw = () => {
"use strict"; // REM
const { ctx, stars, ox, oy, px, py, w, h, _nb, _s, drago } = sfo; // REM
let x, y; // REM
sfo.translate(); // REM
x = ox + (drago ? px : 0); // REM
y = oy + (drago ? py : 0); // REM
ctx.fillStyle = "#000";
ctx.fillRect(-x, -y, w, h); // REM
//ctx.fillRect(-w / 2, -h / 2, w, h); // NREM
ctx.fillStyle = "#fff";
for (let i = 0; i < _nb; i++) {
[x, y] = stars[i];
x += drago ? -px : 0; // REM
y += drago ? -py : 0; // REM
ctx.beginPath();
ctx.arc(px + x, py + y, _s * 2, 0, CIRCLE); // REM
//ctx.arc(x, y, _s * 2, 0, CIRCLE); // NREM
ctx.fill();
}
sfo.crt_draw(); // REM
sfo.debug_draw(); // REM
sfo.delta = sfo.time; // REM
sfo.time = performance.now(); // REM
sfo.tick(step1_draw); // REM
};
CIRCLE = Math.PI * 2; // 360° in radians
</script>
<script type="application/javascript" id="step2">
step2_init = () => {
"use strict"; // REM
const { stars, vx, vy, _nb, _w, _fp, _np } = sfo; // REM
let { depth } = sfo; // REM
depth = _fp - _np;
for (let i = 0; i < _nb; i++) {
stars[i] = new Float32Array(3);
stars[i][0] = vx + (lcg() - 0.5) * _w;
stars[i][1] = vy + (lcg() - 0.5) * _w;
stars[i][2] = _np + depth * lcg();
}
};
step2_draw = () => {
"use strict"; // REM
const { ctx, stars, ox, oy, px, py, w, h, _nb, _s, drago } = sfo; // REM
let x, y, z; // REM
sfo.translate(); // REM
x = ox + (drago ? px : 0); // REM
y = oy + (drago ? py : 0); // REM
ctx.fillStyle = "#000";
ctx.fillRect(-x, -y, w, h); // REM
//ctx.fillRect(-w / 2, -h / 2, w, h); // NREM
ctx.fillStyle = "#fff";
for (let i = 0; i < _nb; i++) {
[x, y, z] = stars[i];
[x, y, z] = sfo.get_p(x, y, z); // REM
ctx.beginPath();
ctx.arc(x / z, y / z, _s * 2, 0, CIRCLE);
ctx.fill();
}
sfo.crt_draw(); // REM
sfo.debug_draw(); // REM
sfo.delta = sfo.time; // REM
sfo.time = performance.now(); // REM
sfo.tick(step2_draw); // REM
};
</script>
<script type="application/javascript" id="step3">
step3_draw = () => {
"use strict"; // REM
const { ctx, stars, ox, oy, px, py, w, h, _nb, _s, _f, drago } = sfo; // REM
let x, y, z, r; // REM
sfo.translate(); // REM
x = ox + (drago ? px : 0); // REM
y = oy + (drago ? py : 0); // REM
ctx.fillStyle = "#000";
ctx.fillRect(-x, -y, w, h); // REM
//ctx.fillRect(-w / 2, -h / 2, w, h); // NREM
ctx.fillStyle = "#fff";
for (let i = 0; i < _nb; i++) {
[x, y, z] = stars[i];
[x, y, z] = sfo.get_p(x, y, z); // REM
r = (1 / z) * _f;
ctx.beginPath();
ctx.arc(x * r, y * r, _s * r, 0, CIRCLE);
ctx.fill();
}
sfo.crt_draw(); // REM
sfo.debug_draw(); // REM
sfo.delta = sfo.time; // REM
sfo.time = performance.now(); // REM
sfo.tick(step3_draw); // REM
};
</script>
<script type="application/javascript" id="step4">
step4_draw = () => {
"use strict"; // REM
const { ctx, stars, depth, ox, oy, px, py, w, h, drago } = sfo; // REM
const { _nb, _s, _f, _np, _cl } = sfo; // REM
let x, y, z, r, c; // REM
sfo.translate(); // REM
x = ox + (drago ? px : 0); // REM
y = oy + (drago ? py : 0); // REM
ctx.fillStyle = "#000";
ctx.fillRect(-x, -y, w, h); // REM
//ctx.fillRect(-w / 2, -h / 2, w, h); // NREM
for (let i = 0; i < _nb; i++) {
[x, y, z] = stars[i];
[x, y, z] = sfo.get_p(x, y, z); // REM
r = _f / z;
z -= _np;
c = (1 - Math.pow(z / depth, _cl)) * 255.999;
ctx.fillStyle = `rgb(${c} ${c} ${c})`;
ctx.beginPath();
ctx.arc(x * r, y * r, _s * r, 0, CIRCLE);
ctx.fill();
}
sfo.crt_draw(); // REM
sfo.debug_draw(); // REM
sfo.delta = sfo.time; // REM
sfo.time = performance.now(); // REM
sfo.tick(step4_draw); // REM
};
</script>
<script type="application/javascript" id="step5">
step5_draw = () => {
"use strict"; // REM
const { ctx, stars, depth, ox, oy, px, py, w, h, drago } = sfo; // REM
const { _nb, _s, _f, _np, _cl, _o } = sfo; // REM
let x, y, z, r, c; // REM
sfo.translate(); // REM
x = ox + (drago ? px : 0); // REM
y = oy + (drago ? py : 0); // REM
ctx.fillStyle = `rgb(0 0 0 / ${_o})`;
ctx.fillRect(-x, -y, w, h); // REM
//ctx.fillRect(-w / 2, -h / 2, w, h); // NREM
for (let i = 0; i < _nb; i++) {
[x, y, z] = get_position(stars[i]);
r = _f / z;
z -= _np;
c = (1 - Math.pow(z / depth, _cl)) * 255.999;
ctx.fillStyle = `rgb(${c} ${c} ${c})`;
ctx.beginPath();
ctx.arc(x * r, y * r, _s * r, 0, CIRCLE);
ctx.fill();
}
sfo.crt_draw(); // REM
sfo.debug_draw(); // REM
sfo.delta = sfo.time;
sfo.time = performance.now();
sfo.update_distance(); // REM
//distance += (time - delta) / 1000 * _mo; // NREM
sfo.tick(step5_draw);
};
get_position = (star) => {
"use strict"; // REM
const { distance, depth, _np, _fp, drag } = sfo; // REM
let [x, y, z] = star;
if (drag) x += sfo.px; // REM
if (drag) y += sfo.py; // REM
z -= distance % depth;
if (z < _np) {
z += depth;
} else if (z > _fp) {
z -= depth;
}
return [x, y, z];
};
</script>
<script type="application/javascript" id="step6">
step6_draw = () => {
"use strict"; // REM
const { ctx, stars, depth, ox, oy, px, py, w, h, drago } = sfo; // REM
const { _nb, _s, _f, _np, _cl, _o, _g, _hl } = sfo; // REM
let x, y, z, r, d, a, r1, r2, g; // REM
sfo.translate(); // REM
x = ox + (drago ? px : 0); // REM
y = oy + (drago ? py : 0); // REM
ctx.fillStyle = `rgb(0 0 0 / ${_o})`;
ctx.fillRect(-x, -y, w, h); // REM
//ctx.fillRect(-w / 2, -h / 2, w, h); // NREM
let i = _nb;
while (i) {
i--;
[x, y, z] = get_position(stars[i]);
r = _f / z;
d = _g * r;
x *= r;
y *= r;
z -= _np;
a = 1 - Math.pow(z / depth, _cl) * 1;
r1 = (_s / _g) * 0.8;
r2 = (_s / _g) * 1.2;
g = ctx.createRadialGradient(x, y, 0, x, y, d);
g.addColorStop(0, `hsl(0 0% 100% / ${a})`);
g.addColorStop(r1, `hsl(0 0% 100% / ${a})`);
g.addColorStop(r2, `hsl(0 0% 100% / ${a * _hl * _o})`);
g.addColorStop(1, "#0000");
ctx.fillStyle = g;
ctx.fillRect(x - d, y - d, d * 2, d * 2);
}
sfo.crt_draw(); // REM
sfo.debug_draw(); // REM
sfo.delta = sfo.time;
sfo.time = performance.now();
sfo.update_distance(); // REM
//distance += (time - delta) / 1000 * _mo; // NREM
sfo.tick(step6_draw);
};
</script>
<script type="application/javascript" id="step7">
step7_draw = () => {
"use strict"; // REM
const { ctx, stars, depth, ox, oy, px, py, w, h, drago } = sfo; // REM
const { _nb, _s, _f, _np, _cl, _o, _g, _hl, _dof } = sfo; // REM
let x, y, z, r, d, dof, a, r1, r2, g; // REM
sfo.translate(); // REM
x = ox + (drago ? px : 0); // REM
y = oy + (drago ? py : 0); // REM
ctx.fillStyle = `rgb(0 0 0 / ${_o})`;
ctx.fillRect(-x, -y, w, h); // REM
//ctx.fillRect(-w / 2, -h / 2, w, h); // NREM
let i = _nb;
while (i) {
i--;
[x, y, z] = get_position(stars[i]);
r = _f / z;
d = _g * r;
x *= r;
y *= r;
z -= _np;
dof = Math.min(1, Math.pow(z / (depth * _dof), _cl));
a = (1 - Math.pow(z / depth, _cl)) * dof;
r1 = Math.max((_s / _g) * 0.8 * dof, 0);
r2 = Math.min((_s / _g) * (2.2 - dof), 1);
g = ctx.createRadialGradient(x, y, 0, x, y, d);
g.addColorStop(0, `hsl(0 0% 100% / ${a})`);
g.addColorStop(r1, `hsl(0 0% 100% / ${a})`);
g.addColorStop(r2, `hsl(0 0% 100% / ${a * _hl * _o})`);
g.addColorStop(1, "#0000");
ctx.fillStyle = g;
ctx.fillRect(x - d, y - d, d * 2, d * 2);
}
sfo.crt_draw(); // REM
sfo.debug_draw(); // REM
sfo.delta = sfo.time;
sfo.time = performance.now();
sfo.update_distance(); // REM
//distance += (time - delta) / 1000 * _mo; // NREM
sfo.tick(step7_draw);
};
</script>
<script type="application/javascript" id="step8">
step8_draw = () => {
"use strict"; // REM
const { ctx, stars, depth } = sfo; // REM
const { _nb, _s, _f, _np, _cl, _o, _g, _hl, _dof } = sfo; // REM
let x, y, z, r, d, dof, l, r1, r2, g; // REM
step8_clear();
let i = _nb;
while (i) {
i--;
[x, y, z] = get_position(stars[i]);
r = _f / z;
d = _g * r;
x *= r;
y *= r;
z -= _np;
dof = Math.min(1, Math.pow(z / (depth * _dof), _cl));
l = (1 - Math.pow(z / depth, _cl)) * 100 * dof;
r1 = Math.max((_s / _g) * 0.8 * dof, 0);
r2 = Math.min((_s / _g) * (2.2 - dof), 1);
g = ctx.createRadialGradient(x, y, 0, x, y, d);
g.addColorStop(0, `hsl(0 0% ${l}%)`);
g.addColorStop(r1, `hsl(0 0% ${l}%)`);
g.addColorStop(r2, `hsl(0 0% ${l * _hl * _o}%)`);
g.addColorStop(1, "#000");
ctx.fillStyle = g;
ctx.fillRect(x - d, y - d, d * 2, d * 2);
}
sfo.crt_draw(); // REM
sfo.debug_draw(); // REM
sfo.delta = sfo.time;
sfo.time = performance.now();
sfo.update_distance(); // REM
//distance += (time - delta) / 1000 * _mo; // NREM
sfo.tick(step8_draw);
};
step8_clear = () => {
"use strict"; // REM
const { ctx } = sfo; // REM
ctx.setTransform(1, 0, 0, 1, 0, 0); // REM
ctx.scale(sfo.dpr, sfo.dpr); // REM
const x = sfo.ox + (sfo.drago ? sfo.px : 0); // REM
const y = sfo.oy + (sfo.drago ? sfo.py : 0); // REM
ctx.translate(x, y); // REM
ctx.globalCompositeOperation = "source-over";
ctx.globalAlpha = sfo._o;
ctx.fillStyle = "#000";
ctx.fillRect(-x, -y, sfo.w, sfo.h); // REM
//ctx.fillRect(-w / 2, -h / 2, w, h); // NREM
ctx.globalAlpha = 1;
ctx.globalCompositeOperation = "lighter";
};
</script>
<script type="application/javascript" id="step9">
step9_init = () => {
"use strict"; // REM
const { vx, vy, stars, depth, _w, _nb, _np } = sfo; // REM
let x, y, k, a, r; // REM
for (let i = 0; i < _nb; i++) {
x = lcg() - 0.5;
y = lcg() - 0.5;
stars[i] = new Float32Array(5);
stars[i][0] = vx + x * _w;
stars[i][1] = vy + y * _w;
stars[i][2] = _np + depth * lcg();
stars[i][3] = 240 + (lcg() * 4 - x - y) * 20;
stars[i][4] = lcg() * 200 - 50;
}
};
step9_draw = () => {
"use strict"; // REM
const { ctx, stars, depth, distance } = sfo; // REM
const { _nb, _s, _f, _np, _cs, _cl, _cy, _o, _g, _hl, _dof } = sfo; // REM
let x, y, z, r, d, u, s, dof, l, r1, r2, g; // REM
clear();
let i = _nb;
while (i) {
i--;
[x, y, z] = get_position(stars[i]);
r = _f / z;
d = _g * r;
x *= r;
y *= r;
z -= _np;
u = stars[i][3] + (_cy / depth) * (z + distance);
s = stars[i][4] * _cs;
dof = Math.min(1, Math.pow(z / (depth * _dof), _cl));
l = (1 - Math.pow(z / depth, _cl)) * 100 * dof * _o;
r1 = Math.max((_s / _g) * dof * 0.8, 0);
r2 = Math.min((_s / _g) * (2.2 - dof), 1);
g = ctx.createRadialGradient(x, y, 0, x, y, d);
g.addColorStop(0, `hsl(${u} ${s}% ${l / _o}%)`);
g.addColorStop(r1, `hsl(${u} ${s}% ${l}%)`);
g.addColorStop(r2, `hsl(${u} ${s}% ${l * _hl}%)`);
g.addColorStop(1, "#000");
ctx.fillStyle = g;
ctx.fillRect(x - d, y - d, d * 2, d * 2);
}
sfo.crt_draw(); // REM
sfo.debug_draw(); // REM
sfo.delta = sfo.time;
sfo.time = performance.now();
sfo.update_distance(); // REM
//distance += (time - delta) / 1000 * _mo; // NREM
sfo.tick(step9_draw);
};
clear = () => {
"use strict"; // REM
const { ctx, dpr, depth, distance, _cs, _cy, _o } = sfo; // REM
const { ox, oy, px, py, w, h, drago } = sfo; // REM
ctx.setTransform(1, 0, 0, 1, 0, 0); // REM
ctx.scale(dpr, dpr); // REM
const x = ox + (drago ? px : 0); // REM
const y = oy + (drago ? py : 0); // REM
ctx.translate(x, y); // REM
ctx.globalCompositeOperation = "source-over";
ctx.globalAlpha = sfo._o;
ctx.fillStyle = `hsl(${(_cy / depth) * distance} ${_cs * 100}% 5%)`;
ctx.fillRect(-x, -y, w, h);
ctx.globalAlpha = 1;
ctx.globalCompositeOperation = "lighter";
};
</script>
<script type="application/javascript" id="step10">
step10_draw = () => {
"use strict"; // REM
const { ctx, stars, depth, distance } = sfo; // REM
const { _nb, _s, _f, _np, _cs, _cy, _cl, _o, _g, _hl, _dof } = sfo; // REM
let x, y, z, r, d, u, s, dof, l, r1, r2, g; // REM
clear();
let i = _nb;
while (i) {
i--;
[x, y, z] = get_position(stars[i]);
r = _f / z;
d = _g * r;
x *= r;
y *= r;
z -= _np;
u = stars[i][3] + (_cy / depth) * (z + distance);
s = stars[i][4] * _cs;
dof = Math.min(1, Math.pow(z / (depth * _dof), _cl));
l = (1 - Math.pow(z / depth, _cl)) * 100 * dof * _o;
g = ctx.createRadialGradient(x, y, 0, x, y, d);
r1 = Math.max((_s / _g) * dof * 0.8, 0);
r2 = Math.min((_s / _g) * (2.2 - dof), 1);
g.addColorStop(0, `hsl(${u} ${s}% ${l / _o}%)`);
g.addColorStop(r1, `hsl(${u} ${s}% ${l}%)`);
g.addColorStop(r2, `hsl(${u} ${s}% ${l * _hl}%)`);
g.addColorStop(1, "#000");
ctx.fillStyle = g;
ctx.fillRect(x - d, y - d, d * 2, d * 2);
g = null; // REM
if (s > 0) spikes(x, y, r, u, s, l, dof);
}
sfo.crt_draw(); // REM
sfo.debug_draw(); // REM
sfo.delta = sfo.time;
sfo.time = performance.now();
sfo.update_distance(); // REM
//distance += (time - delta) / 1000 * _mo; // NREM
sfo.tick(step10_draw);
};
spikes = (x, y, r, u, s, l, dof) => {
if (sfo.nospikes) return; // REM
const { ctx, _s, _o } = sfo; // REM
const k = 8 * _s * r;
const r1 = Math.max((_s / 8) * dof * 0.8, 0);
const r2 = Math.min((_s / 8) * (2.2 - dof), 1);
let g = ctx.createRadialGradient(x, y, 0, x, y, k);
g.addColorStop(0, `hsl(${u} ${s}% ${l / _o}%)`);
g.addColorStop(r1, `hsl(${u + 30} ${s}% ${l / _o}%)`);
g.addColorStop(r2, `hsl(${u + 60} ${s}% ${l}%)`);
g.addColorStop(0.4, `hsl(${u} ${s}% ${l / 4}%)`);
g.addColorStop(1, `hsl(${u - 90} ${s}% 0%)`);
ctx.fillStyle = g;
const sw = _s * r * 2;
const st = sw / 12;
const sr = sw - st * 2;
ctx.beginPath();
ctx.arc(x - sw, y - sw, sr, CIRCLE / 4, 0, true);
ctx.lineTo(x - st, y - k);
ctx.lineTo(x + st, y - k);
ctx.arc(x + sw, y - sw, sr, CIRCLE / 2, CIRCLE / 4, true);
ctx.lineTo(x + k, y - st);
ctx.lineTo(x + k, y + st);
ctx.arc(x + sw, y + sw, sr, -CIRCLE / 4, CIRCLE / 2, true);
ctx.lineTo(x + st, y + k);
ctx.lineTo(x - st, y + k);
ctx.arc(x - sw, y + sw, sr, 0, -CIRCLE / 4, true);
ctx.lineTo(x - k, y + st);
ctx.lineTo(x - k, y - st);
ctx.fill();
g = null; // REM
};
</script>
<script type="application/javascript" id="step11">
step11_draw = () => {
"use strict"; // REM
const { ctx, stars, depth, distance, ox, oy, px, py, w, h } = sfo; // REM
const { _nb, _s, _f, _np, _cs, _cy, _cl, _o, _g, _hl, _dof, _mi } = sfo; // REM
let x, y, z, r, d, u, s, dof, l, r1, r2, g, k; // REM
clear();
let i = _nb;
while (i) {
i--;
[x, y, z] = get_position(stars[i]);
r = _f / z;
d = _g * r;
x *= r;
y *= r;
if (y > -d) continue;
z -= _np;
u = stars[i][3] + (_cy / depth) * (z + distance);
s = stars[i][4] * _cs;
dof = Math.min(1, Math.pow(z / (depth * _dof), _cl));
l = (1 - Math.pow(z / depth, _cl)) * 100 * dof * _o;
r1 = Math.max((_s / _g) * dof * 0.8, 0);
r2 = Math.min((_s / _g) * (2.2 - dof), 1);
g = ctx.createRadialGradient(x, y, 0, x, y, d);
g.addColorStop(0, `hsl(${u} ${s}% ${l / _o}%)`);
g.addColorStop(r1, `hsl(${u} ${s}% ${l}%)`);
g.addColorStop(r2, `hsl(${u} ${s}% ${l * _hl}%)`);
g.addColorStop(1, "#000");
ctx.fillStyle = g;
ctx.fillRect(x - d, y - d, d * 2, d * 2);
g = undefined; // REM
if (s > 0) spikes(x, y, r, u, s, l, dof); // REM
u += 120 * _mi;
s *= _mi / 4;
l *= _mi / 2;
g = ctx.createRadialGradient(x, -y, 0, x, -y, d);
g.addColorStop(0, `hsl(${u} ${s}% ${l / _o}%)`);
g.addColorStop(r1, `hsl(${u} ${s}% ${l}%)`);
g.addColorStop(r2, `hsl(${u} ${s}% ${l * _hl}%)`);
g.addColorStop(1, "#000");
ctx.fillStyle = g;
ctx.fillRect(x - d, -y - d, d * 2, d * 2);
g = undefined; // REM
if (stars[i][4] * _cs > 0) spikes(x, -y, r, u, s, l, dof); // REM
}
sfo.crt_draw(); // REM
sfo.debug_draw(); // REM
sfo.delta = sfo.time;
sfo.time = performance.now();
sfo.update_distance(); // REM
//distance += (time - delta) / 1000 * _mo; // NREM
sfo.tick(step11_draw);
};
</script>
<script type="application/javascript" id="step12">
step12_draw = () => {
"use strict"; // REM
const { ctx, stars, depth, distance, ox, oy, px, py, w, h, drag, drago } = sfo; // REM
const { _nb, _w, _s, _f, _np, _cs, _cy, _cl, _o, _g, _hl, _dof, _mi, _ho } = sfo; // REM
let x, y, z, r, d, u, s, dof, l, r1, r2, g, k, ho; // REM
step12_clear();
let i = _nb;
while (i) {
i--;
[x, y, z] = get_position(stars[i]);
r = _f / z;
d = _g * r;
x *= r;
y *= r;
if (y > -d) continue;
z -= _np;
u = stars[i][3] + (_cy / depth) * (z + distance);
s = stars[i][4] * _cs;
dof = Math.min(1, Math.pow(z / (depth * _dof), _cl));
l = (1 - Math.pow(z / depth, _cl)) * 100 * dof * _o;
r1 = Math.max((_s / _g) * dof * 0.8, 0);
r2 = Math.min((_s / _g) * (2.2 - dof), 1);
g = ctx.createRadialGradient(x, y, 0, x, y, d);
g.addColorStop(0, `hsl(${u} ${s}% ${l / _o}%)`);
g.addColorStop(r1, `hsl(${u} ${s}% ${l}%)`);
g.addColorStop(r2, `hsl(${u} ${s}% ${l * _hl}%)`);
g.addColorStop(1, "#000");
ctx.fillStyle = g;
ctx.fillRect(x - d, y - d, d * 2, d * 2);
g = undefined; // REM
if (s > 0) spikes(x, y, r, u, s, l, dof); // REM
u += 120 * _mi;
s *= _mi / 4;
l *= _mi / 2;
g = ctx.createRadialGradient(x, -y, 0, x, -y, d);
g.addColorStop(0, `hsl(${u} ${s}% ${l / _o}%)`);
g.addColorStop(r1, `hsl(${u} ${s}% ${l}%)`);
g.addColorStop(r2, `hsl(${u} ${s}% ${l * _hl}%)`);
g.addColorStop(1, "#000");
ctx.fillStyle = g;
ctx.fillRect(x - d, -y - d, d * 2, d * 2);
g = undefined; // REM
if (stars[i][4] * _cs > 0) spikes(x, -y, r, u, s, l, dof); // REM
}
sfo.crt_draw(); // REM
sfo.debug_draw(); // REM
sfo.delta = sfo.time;
sfo.time = performance.now();
sfo.update_distance(); // REM
//distance += (time - delta) / 1000 * _mo; // NREM
sfo.tick(step12_draw);
};
step12_clear = () => {
"use strict"; // REM
const { ctx, dpr, depth, distance, _cs, _cy, _o, _mi } = sfo; // REM
const { ox, oy, px, py, w, h, drago } = sfo; // REM
ctx.setTransform(1, 0, 0, 1, 0, 0); // REM
ctx.scale(dpr, dpr); // REM
const x = ox + (drago ? px : 0); // REM
const y = oy + (drago ? py : 0); // REM
ctx.translate(x, y); // REM
ctx.globalCompositeOperation = "source-over";
ctx.globalAlpha = _o;
const u = (_cy / depth) * distance;
const s = _cs * 100;
let g = ctx.createLinearGradient(0, -y, 0, h - y);
const hy = y / h;
g.addColorStop(0, `hsl(${u - 60} ${s}% 5%)`);
g.addColorStop(hy * 0.4, `hsl(${u - 40} ${s}% 10%)`);
g.addColorStop(hy * 0.8, `hsl(${u - 20} ${s}% 20%)`);
g.addColorStop(hy * 0.99, `hsl(${u} ${s}% 30%)`);
g.addColorStop(hy * 1.02, `hsl(${u + 20} ${s}% 10%)`);
g.addColorStop(1, `hsl(${u + 40} ${s / 2}% 5%)`);
ctx.fillStyle = g;
ctx.fillRect(-x, -y, w, h);
ctx.globalAlpha = 1;
ctx.globalCompositeOperation = "lighter";
g = undefined; // REM
};
</script>