@xtor/cga.js
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Xtor Compute Geometry Algorithm Libary 计算几何算法库
81 lines (80 loc) • 3.14 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.circle = exports.Circle = void 0;
var Vec3_1 = require("../../math/Vec3");
var common_1 = require("../../alg/common");
var Line_1 = require("./Line");
var Circle = /** @class */ (function () {
/**
* 圆圈
* @param {Vec3} center 中心点
* @param {Vec3} normal 法线
* @param {Number} radius 半径
*/
function Circle(center, radius, normal) {
if (center === void 0) { center = new Vec3_1.Vec3(); }
if (radius === void 0) { radius = 0; }
if (normal === void 0) { normal = Vec3_1.Vec3.UnitY; }
this.center = center;
this.radius = radius;
this.normal = normal;
this.startAngle = 0;
this.endAngle = Math.PI * 2;
this.radiusSqr = 0;
}
Circle.prototype.area = function () {
return Math.PI * this.radius * this.radius;
};
/**
* 两个点
* @param fixp0
* @param fixp1
* @param movep
* @param normal
*/
Circle.prototype.arc1 = function (fixp0, fixp1, movep, normal) {
this.setFrom3Points(fixp0, fixp1, movep);
this.startAngle = 0;
this.endAngle = common_1.angle(fixp0.clone().sub(this.center).normalize(), fixp1.clone().sub(this.center).normalize(), this.normal || normal);
};
/**
* 全两个点确定半径，后面点确定 弧度 ,只需要检测鼠标移动时鼠标是否跨过第一条半径即可确定顺逆时针
* @param fixp0
* @param fixp1
* @param movep
*/
Circle.prototype.arc2 = function (center, fixp1, movep, ccw, normal) {
if (ccw === void 0) { ccw = false; }
this.radius = fixp1.distanceTo(center);
this.center.copy(center);
var v2 = movep.clone().sub(center);
var v1 = fixp1.clone().sub(center);
var jd = common_1.angle(v1, v2);
};
Circle.prototype.setFrom3Points = function (p0, p1, p2, normal) {
// if (pointsCollinear(p0, p1, p2))
// throw ("calcCircleFromThreePoint：三点共线或者距离太近");
var d1 = p1.clone().sub(p0);
var d2 = p2.clone().sub(p0);
var d1center = p1.clone().add(p0).multiplyScalar(0.5);
var d2center = p2.clone().add(p0).multiplyScalar(0.5);
normal = normal || d1.clone().cross(d2).normalize();
d1.applyAxisAngle(normal, Math.PI / 2);
d2.applyAxisAngle(normal, Math.PI / 2);
var line1 = new Line_1.Line(d1center, d1center.clone().add(d1));
var line2 = new Line_1.Line(d2center, d2center.clone().add(d2));
var center = line1.distanceLine(line2).closests[0];
var radiusSqr = p0.distanceToSquared(center);
this.center = center;
this.radiusSqr = radiusSqr;
this.radius = Math.sqrt(radiusSqr);
this.normal = normal;
return this;
};
return Circle;
}());
exports.Circle = Circle;
function circle(center, radius, normal) {
return new Circle(center, radius, normal);
}
exports.circle = circle;