60 lines
1.3 KiB
JavaScript
60 lines
1.3 KiB
JavaScript
var _util = require("./util");
|
|
|
|
var normalizeRadian = _util.normalizeRadian;
|
|
var PI2 = Math.PI * 2;
|
|
/**
|
|
* 圆弧描边包含判断
|
|
* @param {number} cx
|
|
* @param {number} cy
|
|
* @param {number} r
|
|
* @param {number} startAngle
|
|
* @param {number} endAngle
|
|
* @param {boolean} anticlockwise
|
|
* @param {number} lineWidth
|
|
* @param {number} x
|
|
* @param {number} y
|
|
* @return {Boolean}
|
|
*/
|
|
|
|
function containStroke(cx, cy, r, startAngle, endAngle, anticlockwise, lineWidth, x, y) {
|
|
if (lineWidth === 0) {
|
|
return false;
|
|
}
|
|
|
|
var _l = lineWidth;
|
|
x -= cx;
|
|
y -= cy;
|
|
var d = Math.sqrt(x * x + y * y);
|
|
|
|
if (d - _l > r || d + _l < r) {
|
|
return false;
|
|
}
|
|
|
|
if (Math.abs(startAngle - endAngle) % PI2 < 1e-4) {
|
|
// Is a circle
|
|
return true;
|
|
}
|
|
|
|
if (anticlockwise) {
|
|
var tmp = startAngle;
|
|
startAngle = normalizeRadian(endAngle);
|
|
endAngle = normalizeRadian(tmp);
|
|
} else {
|
|
startAngle = normalizeRadian(startAngle);
|
|
endAngle = normalizeRadian(endAngle);
|
|
}
|
|
|
|
if (startAngle > endAngle) {
|
|
endAngle += PI2;
|
|
}
|
|
|
|
var angle = Math.atan2(y, x);
|
|
|
|
if (angle < 0) {
|
|
angle += PI2;
|
|
}
|
|
|
|
return angle >= startAngle && angle <= endAngle || angle + PI2 >= startAngle && angle + PI2 <= endAngle;
|
|
}
|
|
|
|
exports.containStroke = containStroke; |