Hylograph.Shape.Arc

Package

purescript-hylograph-selection

Repository

afcondon/purescript-hylograph-selection

Pure PureScript Arc Generator

Creates SVG path data for circular/annular sectors (pie slices, donut segments). No D3 dependency - pure trigonometry.

Usage

import Hylograph.Shape.Arc (arcPath, ArcDatum)

-- Pie slice (inner radius = 0)
let path = arcPath { innerRadius: 0.0, outerRadius: 100.0 }
      { startAngle: 0.0, endAngle: Math.pi / 2.0 }

-- Donut segment (inner radius > 0)
let path = arcPath { innerRadius: 50.0, outerRadius: 100.0 }
      { startAngle: 0.0, endAngle: Math.pi / 2.0 }

Angles are in radians, with 0 at 12 o'clock, increasing clockwise. This matches D3's convention.

type ArcConfig = { innerRadius :: Number, outerRadius :: Number }

type ArcDatum = { endAngle :: Number, startAngle :: Number }

arcPath :: ArcConfig -> ArcDatum -> String

arcPathWithCenter :: Number -> Number -> ArcConfig -> ArcDatum -> String

degreesToRadians :: Number -> Number

tau :: Number