39 lines
837 B
JavaScript
39 lines
837 B
JavaScript
/**
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* 线段包含判断
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* @param {number} x0
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* @param {number} y0
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* @param {number} x1
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* @param {number} y1
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* @param {number} lineWidth
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* @param {number} x
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* @param {number} y
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* @return {boolean}
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*/
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function containStroke(x0, y0, x1, y1, lineWidth, x, y) {
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if (lineWidth === 0) {
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return false;
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}
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var _l = lineWidth;
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var _a = 0;
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var _b = x0; // Quick reject
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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) {
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return false;
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}
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if (x0 !== x1) {
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_a = (y0 - y1) / (x0 - x1);
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_b = (x0 * y1 - x1 * y0) / (x0 - x1);
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} else {
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return Math.abs(x - x0) <= _l / 2;
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}
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var tmp = _a * x - y + _b;
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var _s = tmp * tmp / (_a * _a + 1);
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return _s <= _l / 2 * _l / 2;
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}
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exports.containStroke = containStroke; |