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starfield.js
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starfield.js
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"use strict";
const VERSION = [0, 2, 3];
/* DOM manipulation shortcuts */
const _i = (id) => document.getElementById(String(id));
const _t = (t) => document.getElementsByTagName(String(t));
const _c = (e) => document.createElement(String(e));
const _a = (p, e) => (p ? p.appendChild(e) : undefined);
const _r = (e) => (e ? e.parentNode.removeChild(e) : undefined);
const NBSP = "\u00A0";
/* math functions */
const PI = Math.PI; /* 180° in radians */
const HALF_PI = Math.PI / 2; /* 90° in radians */
const TWO_PI = Math.PI * 2; /* 360° in radians */
const PHI = (Math.sqrt(5) + 1) / 2; /* golden ratio */
const EULER = Math.E;
const clamp = (n, min, max) => Math.max(min, Math.min(n, max));
const lerp = (n, min, max) => min + n * (max - min);
const normalize = (n, min, max) => (n - min) / (max - min);
const lcg = () => {
"use strict";
const LCG_MUL = 255; // multiplier
const LCG_INC = EULER; // increment
const LCG_MOD = PHI; // modulus
seed = (LCG_MUL * seed + LCG_INC) % LCG_MOD;
return seed / LCG_MOD;
};
const format = (nbr, decimal = 1) => {
const sign = Number(nbr) < 0 ? "-" : "";
const n = Math.abs(Number(nbr) || 0);
if (n < 1e-3 && n !== 0) return `${sign}${n.toExponential(decimal)}`;
if (n >= 0 && n < 1e3) return `${sign}${Number(Number(n).toFixed(decimal))}`;
if (n >= 1e3 && n < 1e6) return `${sign}${Number(Number(n / 1e3).toFixed(decimal))}K`; // thousand
if (n >= 1e6 && n < 1e9) return `${sign}${Number(Number(n / 1e6).toFixed(decimal))}M`; // million
if (n >= 1e9 && n < 1e12) return `${sign}${Number(Number(n / 1e9).toFixed(decimal))}B`; // billion
if (n >= 1e12) return `${sign}${Number(Number(n / 1e12).toFixed(decimal))}T`; // trillion
return `${sign}${Number(n)}`;
};
const SCALE = [1, 2, 2.5, 4, 5, 8, 10];
const scale = (n, inverse = false) => {
let nbr = n;
let div = 1;
if (Math.abs(n) < 1) {
const decimal = 6;
nbr = Number(n.toFixed(6).split(".")[1]);
div = 1 / Math.pow(10, decimal);
}
const mul = Math.pow(10, String(Math.round(nbr)).length - 1);
if (!inverse) {
for (let i = 0; i < SCALE.length; i += 1) {
if (SCALE[i] * mul >= nbr) return SCALE[i] * mul * div;
}
} else {
for (let i = SCALE.length - 1; i >= 0; i -= 1) {
if (SCALE[i] * mul < nbr) return SCALE[i] * mul * div;
}
}
return mul;
};
class Starfield {
SPACE = 256;
DISTANCE = 0;
path = "starfield";
stars = [];
vars = [
["_nb", "number", 0, 4096, 8, 2048],
["_s", "size", 0.01, 1, 0.01, 0.5],
["_w", "space", 8, this.SPACE * 2, 1, (this.SPACE / 4) * 6],
["_fp", "far_p", 1, this.SPACE * 2, 1, this.SPACE],
["_np", "near_p", 1, this.SPACE * 2, 1, 1],
["_f", "focale", 1, this.SPACE * 2, 1, this.SPACE],
["_cl", "light", 0.01, 4, 0.01, 2],
["_mo", "motion", -64, 64, 0.1, 8],
["_o", "opacity", 0.01, 1, 0.01, 0.5],
["_g", "gradient", 1, 28, 0.1, 14],
["_hl", "halo", 0.01, 0.5, 0.01, 0.1],
["_dof", "dof", 0.01, 1, 0.01, 0.12],
["_cs", "color", 0.01, 1, 0.01, 0.5],
["_cy", "cycle", 1, 360, 1, 120],
["_mi", "mirror", 0, 2, 0.01, 1],
//["_ho", "horizon", 0, 32, 1, 16],
];
steps = [
["intro", [2], [6, 11, 24], [3]],
["points", [0, 1], [3, 4, 15], [20]],
["depth", [3, 4], [6, 17], [1]],
["focale", [5], [6, 8]],
["light", [6], [7, 8], [16]],
["motion", [7, 8], [1, [13, 16], [19, 28]], [4]],
["gradient", [9, 10], [[12, 21]]],
["dof", [11], [[12, 15]]],
["blending", null, [[29, 36]], [1]],
["color", [12, 13], [8, 9, 24, 25, [31, 34], 47]],
["spikes", null, [[32, 60]], [24]],
["mirror", [14], [[25, 34]], [10]],
["horizon", null, [[45, 55]], [1]],
];
px = 0;
py = 0;
mx = 0;
my = 0;
drag = false;
drago = false;
wheel = false;
key = null;
shift = false;
star_n = 0;
time = performance.now();
delta = performance.now();
rti = 0;
rtc = 128;
rth = 56;
rtmax = 120;
rt = new Float32Array(128);
constructor() {
/* url params */
this.root = document.location.origin + "/" + this.path + "/";
this.url = new URL(document.location.href).searchParams;
this.step = Number(this.url.get("step")) || 0;
this.space = Number(this.url.get("space")) || this.SPACE;
this.distance = Number(this.url.get("distance")) || this.DISTANCE;
this.seed = Number(this.url.get("seed")) || 0;
this.vx = Number(this.url.get("x")) || 0;
this.vy = Number(this.url.get("y")) || 0;
this.pause = Boolean(this.url.get("pause") !== null);
this.nospikes = Boolean(this.url.get("nospikes") !== null);
this.nocode = Boolean(this.url.get("nocode") !== null);
this.novars = Boolean(this.url.get("novars") !== null);
this.fullscreen = Boolean(this.url.get("fullscreen") !== null);
this.crt = Boolean(this.url.get("crt") !== null);
this.debug = Boolean(this.url.get("debug") !== null);
/* variables */
this.vars.forEach((v) => {
this[v[0]] = Number(this.url.get(v[0].slice(1)) || v[5]);
});
this.depth = this._fp - this._np;
/* steps */
this.steps.forEach((v, i) => {
const btn = _c("button");
btn.id = `step${i}_btn`;
btn.className = "step";
btn.textContent = v[0];
_a(_i("steps"), btn);
btn.addEventListener("click", () => {
this.run(i);
});
});
/* init canvas */
this.cvs = _i("starfield");
this.ctx = this.cvs.getContext("2d", { alpha: false });
this.ctx.imageSmoothingEnabled = true;
this.ctx.imageSmoothingQuality = "high";
this.ctx.lineCap = "round";
/* events */
_i("motion").addEventListener("change", () => {
this.set_pause(!this.pause);
});
_i("spikes").addEventListener("change", () => {
this.set_spikes(!this.nospikes);
});
_i("crt").addEventListener("change", () => {
this.set_crt(!this.crt);
});
_i("nocode").addEventListener("change", () => {
this.set_nocode(!this.nocode);
});
_i("novars").addEventListener("change", () => {
this.set_novars(!this.novars);
});
_i("debug").addEventListener("change", () => {
this.set_debug(!this.debug);
});
addEventListener("focus", () => {
this.single_frame.bind(this);
});
addEventListener("resize", this.resize.bind(this));
addEventListener("keydown", this.keydown.bind(this));
addEventListener("keyup", this.keyup.bind(this));
addEventListener("drop", () => false);
addEventListener("mousemove", this.mousemove.bind(this));
this.cvs.addEventListener("mousedown", this.mousedown.bind(this));
addEventListener("mouseup", this.mouseup.bind(this));
this.cvs.addEventListener("mousewheel", this.mousewheel.bind(this));
}
resize = () => {
const style = getComputedStyle(document.body);
const padding = parseInt(style.getPropertyValue("--padding"));
const slider = parseInt(style.getPropertyValue("--slider-height"));
const content = _i("content");
const menu = _i("menu");
const visual = _i("visual");
const variables = _i("variables");
const code = _t("code")[0];
const menuScroll = Boolean(menu.scrollHeight > menu.clientHeight);
if (this.fullscreen) {
menu.style.display = "none";
this.w = content.offsetWidth;
this.h = content.offsetHeight;
} else {
menu.style.display = "flex";
this.w = content.offsetWidth - padding - menu.offsetWidth - (this.nocode ? 0 : code.offsetWidth + padding);
this.h = content.offsetHeight - (this.novars ? 0 : slider * this.vars.length + padding);
variables.style.height = `${slider * this.vars.length + padding}px`;
if (menuScroll) {
this.w += padding;
menu.style.marginRight = "0px";
} else {
menu.style.marginRight = `${padding}px`;
}
}
this.ox = this.w / 2 + Number(this.url.get("ox") || 0);
this.oy = this.h / 2 - Number(this.url.get("oy") || 0);
this.oz = 1e12;
this.dpr = window.devicePixelRatio;
this.cvs.width = this.w * this.dpr;
this.cvs.height = this.h * this.dpr;
this.cvs.style.width = `${this.w}px`;
this.cvs.style.height = `${this.h}px`;
this.ctx.setTransform(1, 0, 0, 1, 0, 0);
this.ctx.scale(this.dpr, this.dpr);
this.ctx.translate(this.ox, this.oy);
this.generate_crt();
this.single_frame();
};
init = () => {
this.set_pause(this.pause);
this.set_spikes(this.nospikes);
this.set_nocode(this.nocode);
this.set_novars(this.novars);
this.set_fullscreen(this.fullscreen);
this.set_crt(this.crt);
this.set_debug(this.debug);
this.run(this.step);
};
mousedown(e) {
this.mx = e.pageX - this.cvs.offsetLeft - this.cvs.width / 2;
this.my = e.pageY - this.cvs.offsetTop - this.cvs.height / 2;
if (!this.shift) {
this.drag = true;
} else {
this.drago = true;
}
this.cvs.style.cursor = "grab";
this.start();
}
mouseup() {
this.mx = 0;
this.my = 0;
if (this.drag) {
for (let i = 0; i < this.stars.length; i++) {
this.stars[i][0] += this.px;
this.stars[i][1] += this.py;
}
this.vx += this.px;
this.vy += this.py;
this.drag = false;
} else if (this.drago) {
this.ox += this.px;
this.oy += this.py;
this.drago = false;
}
this.px = 0;
this.py = 0;
this.cvs.style.cursor = "crosshair";
this.set_url();
for (let i = 0; i < 4; i++) this.start();
}
mousemove(e) {
const x = e.pageX - this.mx - this.cvs.offsetLeft - this.cvs.width / 2;
const y = e.pageY - this.my - this.cvs.offsetTop - this.cvs.height / 2;
if (this.drag || this.drago) {
this.px = x;
this.py = y;
}
}
mousewheel(e) {
e.preventDefault();
clearTimeout(this.timeout);
if (!this.wheel) {
this.wheel = true;
this.start();
}
this.distance -= (e.deltaY / 2 ** 15) * this._f * this._mo;
this.distance += (360 / this._cy) * this.depth;
this.distance %= (360 / this._cy) * this.depth;
this.timeout = setTimeout(() => {
this.wheel = false;
this.set_url();
}, 250);
}
keyup = (e) => {
this.shift = e.shiftKey;
this.key = e.key;
};
keydown = (e) => {
this.shift = e.shiftKey;
this.ctrl = e.ctrlKey;
this.alt = e.altKey;
this.meta = e.metaKey;
this.key = e.key;
switch (e.key) {
case "c":
this.set_nocode(!this.nocode);
break;
case "v":
this.set_novars(!this.novars);
break;
case "Enter":
case "p":
this.set_pause(!this.pause);
break;
case "f":
this.set_fullscreen(!this.fullscreen);
break;
case "o":
this.set_crt(!this.crt);
break;
case "d":
this.set_debug(!this.debug);
break;
case "r":
if (this.meta) break;
randomize();
break;
case "s":
this.set_spikes(!this.nospikes);
break;
case "x":
reset();
break;
case "X":
center();
break;
case "Escape":
if (document.activeElement) document.activeElement.blur();
if (this.shift) {
document.body.className = document.body.className === "" ? "debug" : "";
} else if (this.fullscreen) {
this.set_fullscreen(false);
}
break;
case "ArrowUp":
if (this.shift) {
this.oy = Math.round(this.oy - 1);
this.start();
} else {
this.run((this.step + this.steps.length - 1) % this.steps.length);
}
break;
case "ArrowDown":
if (this.shift) {
this.oy = Math.round(this.oy + 1);
this.start();
} else {
this.run((this.step + 1) % this.steps.length);
}
break;
case "ArrowLeft":
if (this.shift) {
this.ox = Math.round(this.ox - 1);
this.start();
} else {
this.star_n = (this.star_n + this._nb - 1) % this._nb;
this.single_frame();
}
break;
case "ArrowRight":
if (this.shift) {
this.ox = Math.round(this.ox + 1);
this.start();
} else {
this.star_n = (this.star_n + 1) % this._nb;
this.single_frame();
}
break;
case "PageUp":
this.distance = Math.round(this.distance + this._mo);
this.distance %= (360 / this._cy) * this.depth;
this.start();
break;
case "PageDown":
this.distance = Math.round(this.distance - this._mo);
this.distance %= (360 / this._cy) * this.depth;
this.start();
break;
}
};
set_pause = (state) => {
this.pause = state;
_i("motion").checked = !this.pause;
this.set_url();
if (this.pause) {
this.stop();
} else {
this.start();
}
};
set_spikes = (state) => {
this.nospikes = state;
_i("spikes").checked = !this.nospikes;
this.set_url();
this.single_frame();
};
set_nocode = (state) => {
this.nocode = state;
_i("nocode").checked = !this.nocode;
_t("code")[0].style.display = this.nocode ? "none" : "block";
this.resize();
this.set_url();
this.single_frame();
if (!sfo.nocode) this.code2text();
};
set_novars = (state) => {
this.novars = state;
_i("novars").checked = !this.novars;
_i("variables").style.visibility = this.novars ? "hidden" : "visible";
this.resize();
this.set_url();
this.single_frame();
};
set_fullscreen = (state) => {
this.fullscreen = state;
this.resize();
this.set_url();
this.single_frame();
};
set_crt = (state) => {
this.crt = state;
_i("crt").checked = this.crt;
this.set_url();
this.single_frame();
};
set_debug = (state) => {
this.debug = state;
_i("debug").checked = this.debug;
this.set_url();
this.single_frame();
};
set_url = (e) => {
const title = "starfield" + (this.step > 0 ? ` > step${this.step}: ${this.steps[this.step][0]}` : "");
document.title = title;
let params = [
this.step > 0 ? "step=" + this.step : null,
this._nb !== this.vars[0][5] ? "nb=" + this._nb : null,
this.vx !== 0 ? "x=" + this.vx : null,
this.vy !== 0 ? "y=" + this.vy : null,
this.ox !== this.w / 2 ? "ox=" + (this.ox - this.w / 2) : null,
this.oy !== this.h / 2 ? "oy=" + -(this.oy - this.h / 2) : null, // Y up!
Math.round(this.distance) !== this.DISTANCE ? "distance=" + Math.round(this.distance) : null,
this.seed !== 0 ? `seed=${this.seed}` : null,
this.pause ? "pause" : null,
this.nospikes ? "nospikes" : null,
this.nocode ? "nocode" : null,
this.novars ? "novars" : null,
this.fullscreen ? "fullscreen" : null,
this.crt ? "crt" : null,
this.debug ? "debug" : null,
];
params = params.filter((p) => p !== null);
history.replaceState({ data: "" }, title, this.root + (params.length > 0 ? "?" : "") + params.join("&"));
};
generate_crt = () => {
this.ocvs = _c("canvas");
this.ocvs.width = this.w * this.dpr;
this.ocvs.height = this.h * this.dpr;
this.octx = this.ocvs.getContext("2d", { alpha: false, colorSpace: "display-p3" });
this.octx.imageSmoothingEnabled = true;
this.octx.imageSmoothingQuality = "high";
this.octx.lineCap = "round";
this.octx.setTransform(1, 0, 0, 1, 0, 0);
this.octx.scale(this.dpr, this.dpr);
/* background */
this.octx.fillStyle = `rgb(0 0 0)`;
this.octx.fillRect(0, 0, this.w, this.h);
/* scanline */
const dot = 1;
this.octx.setLineDash([0, dot * 3]);
//this.octx.lineWidth = dot * 0.8;
//this.crt_rgb(dot, 0.75, 0.2, 0, 1);
this.octx.lineWidth = dot * 0.8;
this.crt_rgb(dot, 0.8, 0.2, 0, 1);
};
crt_rgb = (dot, l, c, h, a) => {
const r = dot;
/* R */
this.octx.strokeStyle = `oklch(${l} ${c} ${h} / ${a})`;
let y = dot / 2;
for (let i = 0; i < this.h; i++) {
this.octx.beginPath();
this.octx.moveTo(0, y);
this.octx.lineTo(this.w, y);
this.octx.lineDashOffset = i % 2 === 0 ? 0 : dot * 1.5;
this.octx.stroke();
y += r;
}
/* G */
this.octx.strokeStyle = `oklch(${l} ${c} ${360 / 3 + h} / ${a})`;
y = dot / 2;
for (let i = 0; i < this.h; i++) {
this.octx.beginPath();
this.octx.moveTo(0, y);
this.octx.lineTo(this.w, y);
this.octx.lineDashOffset = dot + (i % 2 === 0 ? 0 : dot * 1.5);
this.octx.stroke();
y += r;
}
/* B */
this.octx.strokeStyle = `oklch(${l} ${c} ${(360 / 3) * 2 + h} / ${a})`;
y = dot / 2;
for (let i = 0; i < this.h; i++) {
this.octx.beginPath();
this.octx.moveTo(0, y);
this.octx.lineTo(this.w, y);
this.octx.lineDashOffset = dot * 2 + (i % 2 === 0 ? 0 : dot * 1.5);
this.octx.stroke();
y += r;
}
};
single_frame = () => {
if (!this.fn) return;
const opacity = this._o;
this._o = 1;
this.fn();
this._o = opacity;
};
start = () => {
if (!this.fn) return;
this.time = performance.now();
cancelAnimationFrame(this.rid);
this.rid = requestAnimationFrame(this.fn.bind(this));
};
stop = () => {
cancelAnimationFrame(this.rid);
this.rid = undefined;
};
tick = (fn) => {
this.rt[this.rti] = Math.min(1000 / (this.time - this.delta), this.rtmax);
this.rti = (this.rti + 1) % this.rtc;
cancelAnimationFrame(this.rid);
if (this.drag || this.drago || this.wheel || (this.step > 4 && !this.pause)) this.rid = requestAnimationFrame(fn);
};
get_p = (x, y, z) => {
if (this.drag) {
x += this.px;
y += this.py;
}
z -= this.distance % this.depth;
if (z < this._np) {
z += this.depth;
} else if (z > this._fp) {
z -= this.depth;
}
return [x, y, z];
};
translate = () => {
this.ctx.setTransform(1, 0, 0, 1, 0, 0);
this.ctx.scale(this.dpr, this.dpr);
this.ctx.translate(this.ox + (this.drago ? this.px : 0), this.oy + (this.drago ? this.py : 0));
};
update_distance = () => {
if (this.pause) return;
this.distance += ((this.time - this.delta) / 1000) * this._mo;
this.distance += (360 / this._cy) * this.depth;
this.distance %= (360 / this._cy) * this.depth;
};
crt_draw = () => {
if (!this.crt) return;
const x = -this.ox - (this.drago ? this.px : 0);
const y = -this.oy - (this.drago ? this.py : 0);
this.ctx.globalCompositeOperation = "overlay";
this.ctx.globalAlpha = this._o;
this.ctx.drawImage(
this.ocvs,
0,
0,
this.w * this.dpr,
this.h * this.dpr,
x,
y,
this.w * this.dpr,
this.h * this.dpr,
);
this.ctx.globalAlpha = 1;
this.ctx.globalCompositeOperation = "source-over";
};
debug_draw = () => {
if (!this.debug) return;
const { ctx, w, h, vx, vy, px, py, ox, oy, oz } = this;
const { step, stars, star_n, distance, depth, drag, drago } = this;
const { _nb, _s, _w, _f, _np, _fp, _g, _dof } = this;
const { rt, rti, rtc, rth, rtmax } = this;
const m = 4;
ctx.globalCompositeOperation = "source-over";
ctx.lineWidth = 2;
ctx.textAlign = "center";
ctx.font = "16px/16px hud";
let x0, y0, r0;
let x1, y1, r1, s1;
let x2, y2, r2, s2;
let x = drag ? px : 0;
let y = drag ? py : 0;
if (step === 0) {
x0 = vx + x;
y0 = vy + y;
x1 = vx + x - _w / 4 - m;
y1 = vy + y - _w / 4 - m;
s1 = _w / 2 + m * 2;
} else if (step === 1) {
x0 = vx + x;
y0 = vy + y;
x1 = vx + x - _w / 2 - m;
y1 = vy + y - _w / 2 - m;
s1 = _w + m * 2;
} else if (step === 2) {
x0 = (vx + x) / oz;
y0 = (vy + y) / oz;
x1 = (vx + x - _w / 2) / _fp - m;
y1 = (vy + y - _w / 2) / _fp - m;
s1 = _w / _fp + m * 2;
x2 = (vx + x - _w / 2) / _np - m;
y2 = (vy + y - _w / 2) / _np - m;
s2 = _w / _np + m * 2;
} else {
r0 = _f / oz;
x0 = (vx + x) * r0;
y0 = (vy + y) * r0;
r1 = _f / _fp;
x1 = (vx + x - _w / 2) * r1 - m;
y1 = (vy + y - _w / 2) * r1 - m;
s1 = _w * r1 + m * 2;
r2 = _f / _np;
x2 = (vx + x - _w / 2) * r2 - m;
y2 = (vy + y - _w / 2) * r2 - m;
s2 = _w * r2 + m * 2;
}
/* grid */
ctx.strokeStyle = "#c50";
x = (drago ? -px : 0) - ox;
y = (drago ? -py : 0) - oy;
ctx.setLineDash([2, 4]);
ctx.beginPath();
ctx.moveTo(x + w / 2, y + 2);
ctx.lineTo(x + w / 2, y + h - 4);
ctx.moveTo(x + 2, y + h / 2);
ctx.lineTo(x + w - 4, y + h / 2);
ctx.stroke();
ctx.setLineDash([]);
ctx.strokeStyle = "#5c0";
ctx.fillStyle = "#5c0";
ctx.beginPath();
ctx.rect(x1, y1, s1, s1);
ctx.rect(x2, y2, s2, s2);
ctx.moveTo(x1, y1);
ctx.lineTo(x2, y2);
ctx.moveTo(x1 + s1, y1);
ctx.lineTo(x2 + s2, y2);
ctx.moveTo(x1 + s1, y1 + s1);
ctx.lineTo(x2 + s2, y2 + s2);
ctx.moveTo(x1, y1 + s1);
ctx.lineTo(x2, y2 + s2);
ctx.stroke();
ctx.fillText(`${_w}×${_w}${step > 0 ? "×" + (_fp - _np) : ""}`, x1 + s1 / 2, y1 - 4);
ctx.beginPath();
ctx.moveTo(x0 - 5, y0);
ctx.lineTo(x0 + 5, y0);
ctx.moveTo(x0, y0 - 5);
ctx.lineTo(x0, y0 + 5);
ctx.stroke();
ctx.lineDashOffset = 2;
ctx.setLineDash([2, 8]);
ctx.beginPath();
ctx.moveTo(x0, y0);
ctx.lineTo(x1 + s1 / 2, y1 + s1 / 2);
ctx.stroke();
ctx.setLineDash([]);
ctx.beginPath();
ctx.arc(x1 + s1 / 2, y1 + s1 / 2, 3, 0, TWO_PI);
ctx.fill();
ctx.beginPath();
ctx.arc(x2 + s2 / 2, y2 + s2 / 2, 6, 0, TWO_PI);
ctx.stroke();
ctx.beginPath();
ctx.arc(x2 + s2 / 2, y2 + s2 / 2, 3, 0, TWO_PI);
ctx.fill();
ctx.lineDashOffset = 8;
ctx.setLineDash([8, 8]);
ctx.beginPath();
ctx.moveTo(x1 + s1 / 2, y1 + s1 / 2);
ctx.lineTo(x2 + s2 / 2, y2 + s2 / 2);
ctx.stroke();
ctx.setLineDash([]);
/* origin */
x = Math.round(ox - w / 2 + (drago ? px : 0));
y = Math.round(oy - h / 2 + (drago ? py : 0));
ctx.fillText(x + "×" + -y, x0, y0 + 18);
/* depth */
if (step > 7) {
x = drag ? px : 0;
y = drag ? py : 0;
r1 = _f / (_np + _dof * depth);
x1 = (vx + x - _w / 2) * r1;
y1 = (vy + y - _w / 2) * r1;
s1 = _w * r1;
ctx.beginPath();
ctx.rect(x1 - 2, y1 - 2, s1 + 4, s1 + 4);
ctx.setLineDash([s1 / 64, s1 / 64]);
ctx.stroke();
ctx.setLineDash([]);
}
/* star position */
const n = star_n % _nb;
if (stars[n]) {
ctx.strokeStyle = "#e50";
ctx.fillStyle = "#e50";
ctx.textAlign = "center";
let p = Math.round(stars[n][0] - vx);
p += "×" + Math.round(stars[n][1] - vy);
let [x, y, z] = get_position(stars[n]);
p += "×" + Math.round(z);
z = step > 1 ? z : _fp;
const r = step !== 2 ? _f / z : 1 / z;
x *= r;
y *= r;
s1 = _s * r * 2 + m * 2;
s2 = _g * r + m * 2;
if (step > 0) {
ctx.strokeRect(x - s1 / 2, y - s1 / 2, s1, s1);
if (step < 7) ctx.fillText(p, x, y - s1 / 2 - 4);
}
if (step > 6) {
ctx.strokeRect(x - s2 / 2, y - s2 / 2, s2, s2);
ctx.fillText(p, x, y - s2 / 2 - 4);
}
}
/* rendertime */
x = (drago ? -px : 0) - ox + w - 8;
y = (drago ? -py : 0) - oy + 8;
ctx.strokeStyle = "#d90";
ctx.fillStyle = "#d90";
squircle(ctx, x - rtc, y, rtc, rth, 3);
ctx.stroke();
ctx.save();
ctx.clip();
ctx.beginPath();
let rtm = 0;
for (let i = 0; i < rtc; i++) {
let k = rti + i;
if (k > rtc - 1) k -= rtc;
const v = (rth / rtmax) * rt[k];
ctx.rect(x - rtc - 1 + i, y + rth - v - 1, 2, 2);
if (i > rtc - 33) rtm += rt[k];
}
ctx.fill();
ctx.restore();
ctx.textAlign = "right";
ctx.fillText(Math.floor(rtm / 32), x - m, y + m + 12);
/* distance */
ctx.fillText(`${Math.round(distance)} LY`, x, y + h - 16);
/* border */
ctx.strokeStyle = "#c50";
x = (drago ? -px : 0) - ox;
y = (drago ? -py : 0) - oy;
squircle(ctx, x + 1, y + 1, w - 2, h - 2, 6);
ctx.stroke();
};
run = (id) => {
stop();
for (let i = 0; i <= this.vars.length; i++) {
_r(_i(`slider${i}`));
_r(_i(`list${i}`));
}
let btn = _i(`step${this.step}_btn`);
if (btn) btn.disabled = false;
this.step = parseInt(id || 0);
this.fn = window[`step${this.step}_draw`] || undefined;
btn = _i(`step${this.step}_btn`);
if (!btn) return;
btn.disabled = true;
let n = 0;
for (let i = 0; i <= this.step; i++) {
const v = this.steps[i][1];
if (!v) continue;
for (let j = 0; j < v.length; j++) {
const [name, text, min, max, step] = this.vars[v[j]];
const slider = _c("form");
slider.id = `slider${n}`;
slider.className = "slider";
_a(_i("variables"), slider);
const label = _c("label");
label.id = `label${n}`;
label.setAttribute("for", `range${n}`);
label.textContent = text;
label.style.float = "left";
_a(slider, label);
const range = _c("input");
range.type = "range";
range.id = `range${n}`;
range.n = n;
range.variable = name;
range.min = min;
range.max = max;
range.step = step;
range.addEventListener("input", this.update);
_a(slider, range);
range.value = this[range.variable];
this.range_color(range);
const value = _c("div");
value.id = `value${n}`;
value.textContent = range.value;
value.className = `var var${n}`;
_a(slider, value);
n++;
}
}
this.ctx.globalCompositeOperation = "source-over";
this.set_url();
this.update();
this.single_frame();
};
update = (e) => {
this.stop();
const v = this.steps[this.step][1];
const range = e?.srcElement || _i(`range${v ? v[0] : "?"}`);
if (range) {
this[range.variable] = Number(range.value);
const value = _i(`value${range.n}`);
if (value) value.textContent = range.value;
this.range_color(range);
}
window.seed = this.seed;
step9_init();
this.depth = this._fp - this._np;
if (!sfo.nocode) this.code2text();
this.start();
};
range_color = (range) => {
const p = normalize(range.value, range.min, range.max);
const r = 64;
const g = 80;
const b = 128;
const c1 = `rgb(${r} ${g} ${b})`;
const c2 = `rgb(${r + p * 64} ${g - p * 32} ${b - p * 64})`;
range.style.backgroundImage = `linear-gradient(90deg,${c1} 0%,${c2} ${p * 100}%,#444 ${p * 100}%)`;
};
reset = () => {
let range = _t("input");
this.vars.forEach((v, i) => {
this[v[0]] = v[5];
for (let i = 0; i < range.length; i++) {
if (range[i].variable === v[0]) {
range[i].value = v[5];
const value = _i(`value${range[i].n}`);
if (value) value.textContent = range[i].value;
this.range_color(range[i]);
break;
}
}
});
this.depth = this._fp - this._np;
};
center = () => {
this.ox = this.w / 2;
this.oy = this.h / 2;
this.vx = 0;
this.vy = 0;
this.ctx.setTransform(1, 0, 0, 1, 0, 0);
this.ctx.scale(this.dpr, this.dpr);
this.ctx.translate(this.ox, this.oy);
};
code2text = () => {
const step = _i(`step${this.step}`);
let text = step ? String(step.textContent) : "\n draw = () => {\n // ERROR! // NREM\n };\n";
text = text.replaceAll(`step${this.step}_`, "");
text = text.replace("tick", "requestAnimationFrame");
text = text.replaceAll("lcg", "Math.random");
text = text.replaceAll("sfo.", "");
text = text.replaceAll("vx + ", "");
text = text.replaceAll("vy + ", "");
text.match(/"([^"]*)"/g).forEach((v) => {
text = text.replaceAll(v.slice(1, -1), `«str»${v.slice(1, -1)}¤`);
});
["(", ")", "[", "]", "{", "}"].forEach((v) => {
text = text.replaceAll(v, `«sy1»${v}¤`);
});
[".", ",", "'", '"', "`", ":", ";", "="].forEach((v) => {
text = text.replaceAll(v, `«sy2»${v}¤`);
});
["$", "#", "@", "%", "&", "|", "<", ">"].forEach((v) => {
text = text.replaceAll(v, `«sy3»${v}¤`);
});
["if ", "for ", "while ", "continue", "return", "new ", "let ", "const "].forEach((v) => {
text = text.replaceAll(v, `«sy4»${v}¤`);
});
["Math", "Float32Array", "requestAnimationFrame", "rgb", "hsl"].forEach((v) => {
text = text.replaceAll(v, `«sy5»${v}¤`);
});
["ctx", "stars", "distance", "depth", "time", "dof", "delta"].forEach((v) => {
text = text.replaceAll(RegExp(`(?<!_)${v}`, "g"), `«sy6»${v}¤`);
});
["THRESHOLD", "CIRCLE"].forEach((v) => {
text = text.replaceAll(v, `«sy7»${v}¤`);
});
["init", "draw", "clear", "get_position"].forEach((v) => {
text = text.replaceAll(v, `«sy8»${v}¤`);
});
this.vars
.map((v) => v[0])
.forEach((v, i) => {
text = text.replaceAll(v, `«var var${i}»${this[v]}¤`);
});
["-", "+", "*", " / "].forEach((v) => {
text = text.replaceAll(v, `«op»${v}¤`);
});
text = text.replaceAll("*", "×");
text = text
.split("\n")
.map((l) => l.slice(2))
.join("\n");
text = text.replaceAll(" ", "«tab»¤");
text = text.split("\n").slice(1);
text.pop();
const code = _t("code")[0];
code.textContent = "";
let n = 0;
let count = text.length;
for (let i = 0; i < count; i++) {
if (text[i].endsWith("// REM")) continue;
if (text[i].endsWith("// NREM")) {
text[i] = text[i].replace("// NREM", "");
text[i] = text[i].replace("//", "");
}
const line = _c("div");
line.id = "line" + n;
line.className = "line";
let txt = `«nbr»${n}¤${text[i] || " "}`;
if (text[i].startsWith("//")) {
line.className += " rem";
txt = txt.replaceAll("//", "");
}
txt = txt.replaceAll("«", '<div class="');
txt = txt.replaceAll("»", '">');
txt = txt.replaceAll("¤", "</div>");
line.innerHTML = txt;
line.childNodes.forEach((e) => {
e.textContent = String(e.textContent).replace(" ", NBSP);
});
_a(code, line);
n++;
}
let hl = this.steps[this.step][2] || [];
count = hl.length;
for (let i = 0; i < count; i++) {
let line;
if (Array.isArray(hl[i])) {
for (let j = hl[i][0]; j <= hl[i][1]; j++) {
line = _i(`line${j}`);
if (line) line.className = "line hl1";
}
} else {
line = _i(`line${hl[i]}`);