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function polarToCartesian(
centerX: number,
centerY: number,
radius: number,
degreesAngle: number
): number[] {
const radianAngle = (degreesAngle - 90) * Math.PI / 180
return [
centerX + radius * Math.cos(radianAngle),
centerY + radius * Math.sin(radianAngle)
]
}
export function describe(
x: number,
y: number,
radius: number,
startAngle: number,
endAngle: number
): string {
const [startX, startY] = polarToCartesian(x, y, radius, endAngle)
const [endX, endY] = polarToCartesian(x, y, radius, startAngle)
const largeArcFlag = endAngle - startAngle <= 180 ? "0" : "1"
return [
"M",
startX.toString(),
startY,
"A",
radius.toString(),
radius.toString(),
"0",
largeArcFlag,
"0",
endX.toString(),
endY.toString(),
].join(" ")
}
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