60 lines
1.3 KiB
JavaScript
60 lines
1.3 KiB
JavaScript
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var _util = require("./util");
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var normalizeRadian = _util.normalizeRadian;
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var PI2 = Math.PI * 2;
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/**
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* 圆弧描边包含判断
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* @param {number} cx
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* @param {number} cy
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* @param {number} r
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* @param {number} startAngle
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* @param {number} endAngle
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* @param {boolean} anticlockwise
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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(cx, cy, r, startAngle, endAngle, anticlockwise, 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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x -= cx;
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y -= cy;
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var 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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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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var tmp = startAngle;
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startAngle = normalizeRadian(endAngle);
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endAngle = normalizeRadian(tmp);
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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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var 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 || angle + PI2 >= startAngle && angle + PI2 <= endAngle;
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}
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exports.containStroke = containStroke;
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