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39 lines
837 B
39 lines
837 B
/** |
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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; |