/// <summary>
/// 设定初始数据
/// </summary>
private void Init()
{
// 获取地质对象的三个控制点，若找不到控制点，则退出
sg_Vector3[] ptsForM1;
if (!CoordSys.CoordHelp.get_KWZBPt3(SJLYID, out ptsForM1))
{
return;
}
// 根据三个控制点，建立M1
if (ptsForM1.Count() > 2)
{
m1 = new CoordSys.M1(ptsForM1);
}
string DXID = string.Empty;
string OperateID = GUIDGenerator.NewGUID;
EditDataSet = GLDXMDXKBLL.GetEditDataSet(SJLYID, OperateID, DXID, string.Empty); // ?
// 用于求M3的控制点
dt = BLHTBLL.GetXDMXJDZB(SJLYID); // 用于求M3（可能重构进入CoordHelp相关函数中）
if (!CoordHelp.get_JBBLZBPt3(SJLYID, CtrlPts, out ptsForM3))
{
return;
}
// 根据三个控制点，建立M3
if (!CoordHelp.IsPtsCollinear(ptsForM3))
{
this.m3Raw = new M3(ptsForM3);
}
if (!this.m3Raw.IsValid)
{
throw new Exception("M3创建失败，请检查控制点坐标。");
}
// 建立M3Screen （M3与M3Screen）
// this.m3Screen = new M3(ptsForM3, xOffset, yOffset);
Point3D[] Pts = new Point3D[3];
Pts[0] = new Point3D(ptsForM3[0].x, ptsForM3[0].y, ptsForM3[0].z);
Pts[1] = new Point3D(ptsForM3[1].x, ptsForM3[1].y, ptsForM3[1].z);
Pts[2] = new Point3D(ptsForM3[2].x, ptsForM3[2].y, ptsForM3[2].z);
// 确定三角形上方顶点、左下的点、右下的点
// 以三角形中最长的边为底边
Point3D pLeftDown = Pts[0], pRightDown = Pts[1], pUp = Pts[2];
if (Pts[1].DistanceTo(Pts[2]) > pLeftDown.DistanceTo(pRightDown))
{
pLeftDown = Pts[1];
pRightDown = Pts[2];
pUp = Pts[0];
}
if (Pts[2].DistanceTo(Pts[0]) > pLeftDown.DistanceTo(pRightDown))
{
pLeftDown = Pts[2];
pRightDown = Pts[0];
pUp = Pts[1];
}
Vector3D tmpBA = pRightDown - pLeftDown;
Vector3D tmpCA = pUp - pLeftDown;
//叉乘，如果方向指向下，就要把三角形镜像一下，否则不符合勘察人员的视角
//镜像，左下方的点和右下方的点互换即可
Vector3D tmpResult = tmpCA.CrossProduct(tmpBA);
if (tmpResult.Z < 0)
{
Point3D tmpP = pLeftDown;
pLeftDown = pRightDown;
pRightDown = tmpP;
}
// 根据海伦公式，计算三角的高
double distAB = pLeftDown.DistanceTo(pRightDown);
double distAC = pLeftDown.DistanceTo(pUp);
double distBC = pRightDown.DistanceTo(pUp);
double r = (distAB + distAC + distBC) / 2;
double S = Math.Sqrt(r * (r - distBC) * (r - distAB) * (r - distAC));
double h = 2 * S / distAB;
//计算包络矩形的宽高比
widthHeightRito = distAB / h;
ptsTriangleSC[0] = pUp;
ptsTriangleSC[1] = pLeftDown;
ptsTriangleSC[2] = pRightDown;
}