arc.ts
1.14 KB
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import {normalizeRadian} from './util';
const PI2 = Math.PI * 2;
/**
* 圆弧描边包含判断
*/
export function containStroke(
cx: number, cy: number, r: number, startAngle: number, endAngle: number,
anticlockwise: boolean,
lineWidth: number, x: number, y: number
): boolean {
if (lineWidth === 0) {
return false;
}
const _l = lineWidth;
x -= cx;
y -= cy;
const d = Math.sqrt(x * x + y * y);
if ((d - _l > r) || (d + _l < r)) {
return false;
}
// TODO
if (Math.abs(startAngle - endAngle) % PI2 < 1e-4) {
// Is a circle
return true;
}
if (anticlockwise) {
const tmp = startAngle;
startAngle = normalizeRadian(endAngle);
endAngle = normalizeRadian(tmp);
}
else {
startAngle = normalizeRadian(startAngle);
endAngle = normalizeRadian(endAngle);
}
if (startAngle > endAngle) {
endAngle += PI2;
}
let angle = Math.atan2(y, x);
if (angle < 0) {
angle += PI2;
}
return (angle >= startAngle && angle <= endAngle)
|| (angle + PI2 >= startAngle && angle + PI2 <= endAngle);
}