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