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Scale the input to choose a frequency:\n                   x*0.01 is smooth, x*1.0 is busy. This is what flow fields,\n                   terrain and contours need.\n  hash(x, y = 0)   uncorrelated pseudo-random, 0..1 — every input independent.\n                   Does NOT make fields; use for scatter, jitter and dithering.\n\nStyle is stateful: fill #000000, stroke none, stroke width 1, opacity 1 to begin with, and each style call applies to every shape drawn after it. There is no process, require, filesystem, network, environment, timer, DOM, canvas binding, Date, fetch, or WebSocket. The isolate returns declarative commands only; the host revalidates them, emits sanitized SVG, and commits one immutable version. Reusing code + seed is byte-identical.\n\nAPI version 4 adds a standard library. These are pure helpers, in scope as bare functions:\n  FIELDS\n    gnoise(x, y, channel = 0)  gradient (Perlin) noise, 0..1. Prefer it to noise():\n                   value noise carries an axis-aligned lattice bias that shows in\n                   flow fields and contours. channel gives independent fields.\n    fbm(x, y, { octaves = 4, lacunarity = 2, gain = 0.5, channel })  0..1\n    ridge(x, y, opts)  1 - |fbm|: creases rather than blobs — mountains, veins, cracks\n    warp(x, y, { amount = 4, passes = 2, ...fbm opts })\n                   Domain warping. Returns { x, y, value, q, r } — the warped\n                   coordinates, the scalar there, and the two intermediate warp\n                   vectors. DRIVE COLOUR FROM q AND r, not from value alone; that is\n                   where the marbled richness of this technique lives.\n    curl(x, y, opts)  divergence-free vector { x, y }. Advect particles through this\n                   rather than a raw gradient: nothing converges into sinks, which is\n                   the difference between combed fur and smoke.\n  PLACEMENT\n    poisson({ r, width, height, x = 0, y = 0, k = 30, max = 20000 })  Bridson blue\n                   noise, returns [[x,y], ...]. Evenly spaced without being regular.\n                   r may be a FUNCTION (x, y) => radius, with rMin also supplied, which\n                   is how density varies across the canvas.\n    jitteredGrid({ columns, rows, width, height, x, y, amount = 0.5 })\n    spatialHash(cellSize) -> { insert(x,y,payload), near(x,y,r), hits(x,y,r), size }\n                   Use it for non-overlap, minimum spacing and collision. A linear\n                   scan over everything placed so far is O(n^2) and will exhaust the\n                   execution limit before the picture is finished.\n  DISTRIBUTIONS\n    gaussian(mean = 0, sd = 1) / pareto(min, alpha) / weighted([[value, weight], ...])\n    pick(array) / shuffle(array)   all seeded and deterministic\n  GEOMETRY\n    chaikin(points, iterations = 2, closed) / spline(points, { segments, closed })\n    simplify(points, tolerance)  Ramer-Douglas-Peucker; a 500-step curve is ~40 points\n                   of shape and 460 points of command bytes you are paying for\n    resample(points, spacing) / convexHull(points) / centroid(points)\n    pointInPolygon(x, y, polygon) / polygonArea(polygon)\n    contour(field, { width, height, x, y, threshold = 0.5, resolution = 96 })\n                   Marching squares over any (x,y) => number you write. Returns\n                   stitched polylines, ready for polyline().\n    contourBands(field, { ...same, thresholds: [...] }) -> [{ threshold, lines }]\n                   Several levels from ONE pass over the field. Use this whenever you\n                   want more than one threshold: your field function is the expensive\n                   part, and calling contour() in a loop re-evaluates it every level.\n  COLOUR — all return #RRGGBB or #RRGGBBAA\n    oklch(l, c, h, alpha)  perceptual. l 0..1, c 0..~0.4, h in degrees. Hold h and c\n                   and step l evenly for a perceptually even tonal ramp, which the\n                   same operation in HSL does not give you. Out-of-gamut requests\n                   lose chroma and keep lightness and hue.\n    oklab(l, a, b, alpha) / hsl(h, s, l, alpha)\n    mix(a, b, t, space = \"oklab\")  blending two saturated hues in sRGB routes them\n                   through desaturated grey at the midpoint; oklab does not\n    lighten / darken(color, amount), saturate(color, factor), rotateHue(color, degrees)\n    alpha(color, a), lightnessOf(color)\n  MATHS\n    clamp, lerp, dist, angle, normalize, smoothstep\n    rescale(v, inMin, inMax, outMin, outMax, curve = 1)  curve bends the mapping;\n                   a non-linear gradient is what stops a spatially varying parameter\n                   from reading as a straight ramp\n  SOURCE IMAGERY — only when source_asset_ids were supplied\n    sourceCount()  how many images this run was given\n    image(i = 0) -> { width, height, rgba(x,y), luminance(x,y), alpha(x,y), hex(x,y),\n                      uv(u,v), uvLuminance(u,v),\n                      atCanvas(x,y,canvasW,canvasH), canvasLuminance(x,y,canvasW,canvasH) }\n                   Coordinates are in the SOURCE image pixel space, which is NOT your\n                   canvas: the host reduced the asset to a bounded box, so read width\n                   and height from the object rather than assuming. Use atCanvas or\n                   canvasLuminance to map a canvas point onto it, or uv() to work in\n                   0..1. Sampling past an edge clamps instead of throwing, because\n                   dither and stipple neighbourhoods legitimately run off the border.\n                   This is what the reprographic family needs and could not have:\n                   error diffusion, ordered and blue-noise dithering, halftone driven\n                   by luminance, weighted stippling, and scatter whose density\n                   follows a picture. Sampled assets become recorded provenance\n                   inputs, so the work stays reproducible.\n  DRAWING SURFACE\n    push() / pop()  save and restore the WHOLE graphics state — transform, style and\n                   clip together. This is what makes recursion writable: descend,\n                   draw in a local frame, come back. Nesting is capped at 64.\n    translate(x, y) / rotate(radians) / scale(sx, sy = sx) / resetMatrix()\n    fillGradient({ from:[x,y], to:[x,y], stops:[{offset,color,opacity?}, ...] })\n    fillRadialGradient({ center:[x,y], radius, stops:[...] })\n    noFillGradient()   parity with strokeGradient; until v4 every fill was flat\n    clip(polygon, mode=\"include\") / noClip()  include or exclude a 3..2,000 point polygon.\n                   mode is \"include\" or \"exclude\". The clip is part of\n                   the graphics state, so push()/pop() nests it. At most 256 regions.\n\nThere is NO blend mode in art code, and that is deliberate rather than an oversight. The renderer parses mix-blend-mode and draws nothing, so a blend() call would produce a committed SVG that does not reproduce its own committed PNG. For multiply, screen, overlay and the rest, render layers here and combine them with compose_image, or build the piece in create_vector_scene; both composite as pixels and both work. The same caution applies to mix-blend-mode written by hand into create_svg markup.\n\nGotchas worth knowing before spending the 4 credits:\n  - Stroke width is the SECOND argument to stroke(), not a separate call. There is\n    no strokeWeight or strokeWidth; use stroke(\"#ffffff\", 12).\n  - noise() is coherent and hash() is not. Picking the wrong one is the difference\n    between a flow field and static, and both return plausible 0..1 values. For new\n    work prefer gnoise()/fbm(); noise() is kept unchanged for reproducibility.\n  - Execution is capped at 3 seconds. Iterative-to-convergence systems (differential\n    growth, physarum, reaction-diffusion) need a coarse grid or a step budget to fit.\n    preflight_art_code costs nothing and tells you whether a program completes.\n  - API version 4 adds the standard library above. Version 3 added polyline() and\n    strokeGradient(); version 2 changed noise() from an uncorrelated hash. noise(),\n    hash() and random() are byte-identical to version 3, so earlier committed work is\n    unchanged; manifests record the version.","credits":4,"pricing":{"kind":"flat"},"recommended_step":3.7,"endpoint":"/api/v2/tools/run_art_code","method":"POST","input_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","type":"object","properties":{"workspace_id":{"type":"string","minLength":1},"code":{"type":"string","minLength":1,"maxLength":64000},"seed":{"description":"Optional. If omitted, the platform generates a seed, persists and returns it with the result. 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