已知：A（Xa，Ya）；B（Xb，Yb）
观测：∠A；∠B
求解：P（Xp，Yp）
求解示意：
求解公示：
或
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private void btnRun_Click(object sender, EventArgs e)
{
#region 解算
//已知坐标A
string CoorAstr = txtCoorA.Text;
if (!CoorAstr.Contains("-"))
{
MessageBox.Show("已知坐标A格式不正确！！！");
return;
}
string[] CoorA = CoorAstr.Split('-');
if (CoorA.Length != 2)
{
MessageBox.Show("已知坐标A格式不正确！！！");
return;
}
double Xa = Convert.ToDouble(CoorA[0]);
double Ya = Convert.ToDouble(CoorA[1]);
//已知坐标B
string CoorBstr = txtCoorB.Text;
if (!CoorBstr.Contains("-"))
{
MessageBox.Show("已知坐标B格式不正确！！！");
return;
}
string[] CoorB = CoorBstr.Split('-');
if (CoorB.Length != 2)
{
MessageBox.Show("已知坐标B格式不正确！！！");
return;
}
double Xb = Convert.ToDouble(CoorB[0]);
double Yb = Convert.ToDouble(CoorB[1]);
//观测角度A
string AngleAstr = TxtAngleA.Text;
if (!AngleAstr.Contains("-"))
{
MessageBox.Show("角度A格式不正确！！！");
return;
}
string[] AngleA = AngleAstr.Split('-');
if (AngleA.Length != 3)
{
MessageBox.Show("角度A格式不正确！！！");
return;
}
float ad = Convert.ToSingle(AngleA[0]);
if ((ad < 0) || (ad > 180))
{
MessageBox.Show("角度A的度不正确！！！");
return;
}
float af = Convert.ToSingle(AngleA[1]);
if ((af < 0) || (af > 60))
{
MessageBox.Show("角度A的分不正确！！！");
return;
}
float am = Convert.ToSingle(AngleA[2]);
if ((am < 0) || (am > 60))
{
MessageBox.Show("角度A的秒不正确！！！");
return;
}
double A = (ad*1.0 + af / 60.0 + am / 3600.0) / 180.0 * Math.PI;
//观测角度B
string AngleBstr = TxtAngleB.Text;
if (!AngleBstr.Contains("-"))
{
MessageBox.Show("角度B格式不正确！！！");
return;
}
string[] AngleB = AngleBstr.Split('-');
if (AngleB.Length != 3)
{
MessageBox.Show("角度B格式不正确！！！");
return;
}
float bd = Convert.ToSingle(AngleB[0]);
if ((bd < 0) || (bd > 180))
{
MessageBox.Show("角度B的度不正确！！！");
return;
}
float bf = Convert.ToSingle(AngleB[1]);
if ((bf < 0) || (bf > 60))
{
MessageBox.Show("角度B的分不正确！！！");
return;
}
float bm = Convert.ToSingle(AngleB[2]);
if ((bm < 0) || (bm > 60))
{
MessageBox.Show("角度B的秒不正确！！！");
return;
}
double B = (bd * 1.0 + bf / 60.0 + bm / 3600.0) * Math.PI / 180.0;
////解算
//double cotA = Math.Round(1.0 / Math.Tan(A), 6);
//double cotB = Math.Round(1.0 / Math.Tan(B), 6);
//double signX=Math.Sign(Ya - Yb);
//double signY=Math.Sign(Xb - Xa);
//double Xp = (Xa * cotB + Xb * cotA + (Ya - Yb)*signX) / (cotA + cotB);
//double Yp = (Ya * cotB + Yb * cotA + (Xb - Xa)*signY) / (cotA + cotB);
double Xp = (Xa * Math.Sin(A) * Math.Cos(B) + Xb * Math.Sin(B) * Math.Cos(A) + (Ya - Yb) * Math.Sign(Ya - Yb) * Math.Sin(A) * Math.Sin(B)) / (Math.Sin(A) * Math.Cos(B) + Math.Sin(B) * Math.Cos(A));
double Yp = (Ya * Math.Sin(A) * Math.Cos(B) + Yb * Math.Sin(B) * Math.Cos(A) + (Xb - Xa) * Math.Sign(Xb - Xa) * Math.Sin(A) * Math.Sin(B)) / (Math.Sin(A) * Math.Cos(B) + Math.Sin(B) * Math.Cos(A));
txtResultX.Text = Xp.ToString("F4");
txtResultY.Text = Yp.ToString("F4");
#endregion
#region 成图
//比例
List<PointF> ListP = new List<PointF>();
PointF PA = new PointF((float)Xa, (float)Ya);
ListP.Add(PA);
PointF PB = new PointF((float)Xb, (float)Yb);
ListP.Add(PB);
PointF PP = new PointF((float)Xp, (float)Yp);
ListP.Add(PP);
ListP.Sort((a, b) => { return a.X.CompareTo(b.X); });
double Xmax = ListP[ListP.Count - 1].X;
double Xmin = ListP[0].X;
double deltaX = Xmax - Xmin;
int picWidth = picMap.Width - 100;
double ratioX = picWidth * 1.0 / deltaX;
ListP.Sort((a, b) => { return a.Y.CompareTo(b.Y); });
double Ymax = ListP[ListP.Count - 1].Y;
double Ymin = ListP[0].Y;
double deltaY = Ymax - Ymin;
int picHeight = picMap.Height - 100;
double ratioY = picHeight * 1.0 / deltaY;
double ratio = Math.Min(ratioX, ratioY);
//坐标点
PointF PAnew = new PointF((float)((PA.X - Xmin) * ratio), (float)(picHeight-((PA.Y - Ymin) * ratio)));
PointF PBnew = new PointF((float)((PB.X - Xmin) * ratio), (float)(picHeight-((PB.Y - Ymin) * ratio)));
PointF PPnew = new PointF((float)((PP.X - Xmin) * ratio), (float)(picHeight-((PP.Y - Ymin) * ratio)));
//线
Graphics gh = picMap.CreateGraphics();
Pen penAB = new Pen(Color.Black, 6);
gh.DrawLine(penAB, PAnew,PBnew);
Pen penP = new Pen(Color.Red, 2);
gh.DrawLine(penP, PAnew, PPnew);
gh.DrawLine(penP, PBnew,PPnew);
//字符串
Font drawFont = new Font("Times New Roman", 10);
SolidBrush brushAB = new SolidBrush(Color.Green);
string Astr = "A(" + PA.X.ToString() + "," + PA.Y.ToString() + ")";
gh.DrawString(Astr, drawFont, brushAB, PAnew.X, PAnew.Y);
string Bstr = "B(" + PB.X.ToString() + "," + PB.Y.ToString() + ")";
gh.DrawString(Bstr, drawFont, brushAB, PBnew.X,PBnew.Y);
SolidBrush brushP = new SolidBrush(Color.Red);
string Pstr = "P(" + PP.X.ToString() + "," + PP.Y.ToString() + ")";
gh.DrawString(Pstr, drawFont, brushP, PPnew);
#endregion
}
VS2010窗体+代码：https://download.csdn.net/download/xinjiang666/11290537
