How to use the @antv/g-canvas/lib/util/arc-params function in @antv/g-canvas
To help you get started, we’ve selected a few @antv/g-canvas examples, based on popular ways it is used in public projects.
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antvis / G2 / src / animate / animation / sector-path-update.ts View on Github 
function getAngle(startPoint: number[], arcPath: PathCommand) {
let { startAngle, endAngle } = getArcParams(startPoint, arcPath);
if (!isNumberEqual(startAngle, -Math.PI * 0.5) && startAngle < -Math.PI * 0.5) {
startAngle += Math.PI * 2;
}
if (!isNumberEqual(endAngle, -Math.PI * 0.5) && endAngle < -Math.PI * 0.5) {
endAngle += Math.PI * 2;
}
if (arcPath[5] === 0) {
// 逆时针，需要将 startAngle 和 endAngle 转置，因为 G2 极坐标系为顺时针方向
[startAngle, endAngle] = [endAngle, startAngle];
}
if (isNumberEqual(startAngle, Math.PI * 1.5)) {
startAngle = Math.PI * -0.5;
}@antv/g-canvas
A renderer implemented by Canvas 2D API
