D3 layout to visualize distance variables using a continuous Hilbert space-filling curve. Here's an example.

See also d3-morton.

If you are looking for a module that also performs rendering, please see hilbert-chart.

```
import d3Hilbert from 'd3-hilbert';
```

or

```
d3.hilbert = require('d3-hilbert');
```

or even

```
<script src="//unpkg.com/d3-hilbert"></script>
```

then

```
const myRange = { start: 4, length: 9 };
d3.hilbert()
.order(2)
.layout(myRange)
```

Method | Description | Default |
---|---|---|

canvasWidth([number]) | Getter/setter for the length of each side of the hilbert square canvas. | 1 |

order([int]) | Getter/setter for the extent of the hilbert curve domain, determined by `4^order` . The maximum safe order is , due to the JS numbers upper-boundary of 53 bits.26 | 4 |

simplifyCurves([boolean]) | Getter/setter for whether to simplify the resolution of the curve to the most canonical 2-bit boundary that fits the range integral. For example, in a 2nd order curve (16 values), a range from 4 to 11 can be simplified from 8 vertices to 2 (each filling a square with 4 values), on the lower quadrants. This simplification greatly reduces the number of vertices in the curve and improves the calculation and rendering performance, specially for high-order ranges which tend to fall on bit boundaries, such as the case of IP address routes. | true |

layout(rangeObject) | Extends the input rangeObject (syntax: `{start:<int>, length:<int>}` ) with 3 additional properties defining the hilbert curve: .cellWidth (number defining the side length of each square cell and essentially the thickness of the line, according to the canvasWidth), .startCell ([int,int] the x,y coordinates of the starting cell) and .pathVertices (Array of vertices, specified in terms of characters indicating movement direction: UDLR (Up, Down, Left, Right)). | |

getValAtXY(num, num) | Returns the reverse translated value on the curve domain found at coordinates x,y, relative to the canvasWidth. | |

getXyAtVal(num) | Returns the `[x, y]` coordinates of the requested value. Throws an error if the value is outside the boundaries of the current hilbert domain. |

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