/// <summary>
/// 起点坐标，角度，长度 绘制直线
/// </summary>
/// <param name="db">图形数据库</param>
/// <param name="startPoint">起点</param>
/// <param name="length">长苏</param>
/// <param name="degree">角度</param>
/// <returns></returns>
public static ObjectId AddLineToModeSpace(this Database db, Point3d startPoint, Double length, Double degree)
{
// 利用长度和角度以及起点 计算终点坐标
double X = startPoint.X + length * Math.Cos(BaseTools.AngleToDegree(degree));
double Y = startPoint.Y + length * Math.Sin(BaseTools.AngleToDegree(degree));
Point3d endPoint = new Point3d(X, Y, 0);
return(db.AddEntityToModeSpace(new Line(startPoint, endPoint)));
}
/// <summary>
/// 绘制椭圆
/// </summary>
/// <param name="db">图形数据库</param>
/// <param name="center">椭圆中心</param>
/// <param name="majorRadius">长轴长度</param>
/// <param name="shortRadius">短轴长度</param>
/// <param name="degree">长轴与X夹角 角度值</param>
/// <param name="startDegree">起始角度</param>
/// <param name="endDegree">终止角度</param>
/// <returns></returns>
public static ObjectId AddEllipseToModeSpace(this Database db, Point3d center, double majorRadius, double shortRadius, double degree, double startDegree, double endDegree)
{
// 计算相关参数
double ratio = shortRadius / majorRadius;
Vector3d majorAxis = new Vector3d(majorRadius * Math.Cos(BaseTools.AngleToDegree(degree)), majorRadius * Math.Sin(BaseTools.AngleToDegree(degree)), 0);
Ellipse elli = new Ellipse(center, Vector3d.ZAxis, majorAxis, ratio, BaseTools.DegreeToAngle(startDegree), BaseTools.DegreeToAngle(endDegree)); // VVector3d.ZAxis 等价于 new Vector3d(0,0,1) 平行于z轴法向量
return(db.AddEntityToModeSpace(elli));
}
