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- /**
- * 线段包含判断
- * @param {number} x0
- * @param {number} y0
- * @param {number} x1
- * @param {number} y1
- * @param {number} lineWidth
- * @param {number} x
- * @param {number} y
- * @return {boolean}
- */
- export function containStroke(
- x0: number, y0: number, x1: number, y1: number,
- lineWidth: number, x: number, y: number
- ): boolean {
- if (lineWidth === 0) {
- return false;
- }
- const _l = lineWidth;
- let _a = 0;
- let _b = x0;
- // Quick reject
- if (
- (y > y0 + _l && y > y1 + _l)
- || (y < y0 - _l && y < y1 - _l)
- || (x > x0 + _l && x > x1 + _l)
- || (x < x0 - _l && x < x1 - _l)
- ) {
- return false;
- }
- if (x0 !== x1) {
- _a = (y0 - y1) / (x0 - x1);
- _b = (x0 * y1 - x1 * y0) / (x0 - x1);
- }
- else {
- return Math.abs(x - x0) <= _l / 2;
- }
- const tmp = _a * x - y + _b;
- const _s = tmp * tmp / (_a * _a + 1);
- return _s <= _l / 2 * _l / 2;
- }
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