/// <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));
}
/// <summary>
/// 绘制正多边形
/// </summary>
/// <param name="db">图形数据库</param>
/// <param name="center">多边形所在内接圆圆心</param>
/// <param name="radius">所在圆半径</param>
/// <param name="sideNum">边数</param>
/// <param name="startDegree">起始角度</param>
/// <returns></returns>
public static ObjectId AddPolygonToModeSpace(this Database db, Point2d center, double radius, int sideNum, double startDegree)
{
// 声明一个多段线对象
Polyline pLine = new Polyline();
// 判断边数是否符合要求
if (sideNum < 3)
{
return(ObjectId.Null);
}
Point2d[] point = new Point2d[sideNum]; // 有几条边就有几个点
double angle = BaseTools.DegreeToAngle(startDegree);
// 计算每个顶点坐标
for (int i = 0; i < sideNum; i++)
{
point[i] = new Point2d(center.X + radius * Math.Cos(angle), center.Y + radius * Math.Sin(angle));
pLine.AddVertexAt(i, point[i], 0, 0, 0);
angle += Math.PI * 2 / sideNum;
}
// 闭合多段线
pLine.Closed = true;
return(db.AddEntityToModeSpace(pLine));
}
// 封装圆弧对象函数
/// <summary>
/// 绘制圆弧
/// </summary>
/// <param name="db">图形数据库</param>
/// <param name="center">中心</param>
/// <param name="radius">半径</param>
/// <param name="startDegree">起始角度</param>
/// <param name="endDegree">终止角度</param>
/// <returns></returns>
public static ObjectId AddArcToModeSpace(this Database db, Point3d center, double radius, double startDegree, double endDegree)
{
return(db.AddEntityToModeSpace(new Arc(center, radius, BaseTools.DegreeToAngle(startDegree), BaseTools.DegreeToAngle(endDegree))));
}