Random SVG Constellation Pattern Generator

Description

Generate bounded decorative integer-coordinate nodes and all unordered links no longer than a supplied Euclidean threshold, with random hex styling and measured total link length in portable SVG; nodes may coincide and do not represent astronomical objects.

Procedural artwork expresses a visual idea through coordinates, repeated motifs, colors, or explicit placement constraints. A coordinate plan can be checked and reproduced before rendering, while physical material behavior and fabrication require separate information.

When to use this tool

Use this generator to create reproducible svg constellation pattern cases from the supplied model or bank. Inspect the returned evidence before using cases in a test or exercise.

How to use the tool and how it works

Supply nodeCount, width, height, maximumLinkDistance in the field shapes below. Set seed when you need an explicit replay.
Run the tool and correct any input error. For generated controls, distinguish a successful fixture containing an invalid case from failure to generate the fixture.
Read nodes, links, color, totalLinkLength, svg. Use the conventions below and keep answer-bearing fields separate when presenting an exercise.

Sample integer points inside the canvas border and a generated hexadecimal color. Connect every unordered point pair whose Euclidean distance is at most the threshold, total those lengths, and serialize the circles and lines as SVG.^[1]

Delegated operations used for this result: hex color. Their calculation or parsing conventions apply to the corresponding result fields.^[2]

Input field	Meaning and units	Accepted input
nodeCount	Node Count	Required. Safe integer; minimum 2; maximum 64.
width	Width	Required. Safe integer; minimum 2.
height	Height	Required. Safe integer; minimum 2.
maximumLinkDistance	Maximum Link Distance	Required. Finite number; minimum 0.
seed	Optional numeric seed; takes precedence over context randomness. Without either, use the fixed tool.io default seed.	Optional. Safe integer.

Output field	Interpretation	Returned shape
nodes	Nodes	Required. Array of Object; no unknown keys.; minimum items 2; maximum items 64.
nodes[].x	X	Required. Finite number.
nodes[].y	Y	Required. Finite number.
links	Links	Required. Array of Object; no unknown keys.; maximum items 2016.
links[].from	From	Required. Safe integer; minimum 0; maximum 63.
links[].to	To	Required. Safe integer; minimum 0; maximum 63.
links[].distance	Distance	Required. Finite number; minimum 0.
color	Color	Required. Text.
totalLinkLength	Total Link Length	Required. Finite number; minimum 0.
svg	Svg	Required. Text; minimum UTF-16 length 1; maximum UTF-16 length 262144.
randomness	Replay metadata: source is seed or context; seed is the normalized 32-bit seed or null for a context source.	Required. Object; no unknown keys.
randomness.seed	Optional numeric replay seed; normalization and precedence are explained below.	Required. Safe integer. or Null.
randomness.source	Source	Required. Text; one of "context", "seed".

An explicit safe-integer seed takes precedence over injected context randomness and is normalized to an unsigned 32-bit integer. With no seed and no context source, replay uses the fixed tool.io default seed. A context source must return finite values from zero inclusive to one exclusive; its advancing state must be retained separately. randomness records the source and normalized seed, or null for context. These generators are not cryptographic random sources.

json

{
  "input": {
    "nodeCount": 3,
    "width": 5,
    "height": 5,
    "maximumLinkDistance": 2.5,
    "seed": 42
  },
  "output": {
    "nodes": [
      {
        "x": 2,
        "y": 4
      },
      {
        "x": 3,
        "y": 1
      },
      {
        "x": 3,
        "y": 2
      }
    ],
    "links": [
      {
        "from": 0,
        "to": 2,
        "distance": 2.23606797749979
      },
      {
        "from": 1,
        "to": 2,
        "distance": 1
      }
    ],
    "color": "#99E1EF",
    "totalLinkLength": 3.23606797749979,
    "svg": "<svg xmlns=\"http://www.w3.org/2000/svg\" viewBox=\"0 0 5 5\"><line x1=\"2\" y1=\"4\" x2=\"3\" y2=\"2\" stroke=\"#99E1EF\" stroke-width=\"0.25\"/><line x1=\"3\" y1=\"1\" x2=\"3\" y2=\"2\" stroke=\"#99E1EF\" stroke-width=\"0.25\"/><circle cx=\"2\" cy=\"4\" r=\"0.5\" fill=\"#99E1EF\"/><circle cx=\"3\" cy=\"1\" r=\"0.5\" fill=\"#99E1EF\"/><circle cx=\"3\" cy=\"2\" r=\"0.5\" fill=\"#99E1EF\"/></svg>",
    "randomness": {
      "seed": 42,
      "source": "seed"
    }
  }
}

Limitations and assumptions

Points can coincide and the graph need not be connected. This is a geometric artwork; it does not use astronomical coordinates or constellation data.
A replay requires the same complete input and implementation. Randomized construction does not guarantee uniform coverage of every feasible output; finite samples can repeat unless a distinct-selection rule is explicitly stated.
The field tables state structural bounds; cross-field constraints and bounded search or output budgets also apply. Unknown keys are rejected where the object contract disallows them. Input errors are distinct from null fields and deliberate invalid controls in a successful output.

Alternative or Complementary methods

For a supplied example, inspect the returned construction or delegated check directly. To evaluate a consumer, also test cases chosen for its own boundaries; a generated finite corpus does not establish exhaustive coverage.

References

Tool behavior and example: Random SVG Constellation Pattern Generator — tool.io
Calculation or validation: random/hex-color — tool.io

Similar or alternative tools

Random Gift Wrap Pattern Placement Plan Generator
Place caller motifs inside vertical fold-clearance bands on a repeat sheet with explicit allowed-overlap tags; app artwork and repeat-edge rendering remain external.
Random Mesh Color Pattern Generator
Generate random hex control nodes and a shared-edge bilinear encoded-sRGB color grid via the existing interpolator, retaining its numeric precision and byte quantization; this is a rectangular mesh approximation, not a perceptual or linear-light blend.