/// <summary>
/// Rechecks all of the lat/lon coordinates in case the coordinate system has changed between
/// geographic and projected.
/// </summary>
private bool CheckAllCoords(bool projected)
{
if (projected)
{
return(GeoUtilities.CheckProjCoordinate(textBoxLon1.Text) &&
GeoUtilities.CheckProjCoordinate(textBoxLat1.Text) &&
GeoUtilities.CheckProjCoordinate(textBoxLon2.Text) &&
GeoUtilities.CheckProjCoordinate(textBoxLat2.Text) &&
GeoUtilities.CheckProjCoordinate(textBoxLon3.Text) &&
GeoUtilities.CheckProjCoordinate(textBoxLat3.Text));
}
else
{
return(GeoUtilities.CheckGeoCoordinate(textBoxLon1.Text) &&
GeoUtilities.CheckGeoCoordinate(textBoxLat1.Text) &&
GeoUtilities.CheckGeoCoordinate(textBoxLon2.Text) &&
GeoUtilities.CheckGeoCoordinate(textBoxLat2.Text) &&
GeoUtilities.CheckGeoCoordinate(textBoxLon3.Text) &&
GeoUtilities.CheckGeoCoordinate(textBoxLat3.Text));
}
}
/// <summary>
/// Loads bearings from a file. The file should look like this:
/// bearing_id,bearing
/// with the first row being a header row, and bearing_id being 1_2, 1_3, or 2_3 for each row.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void buttonLoadBearings_Click(object sender, EventArgs e)
{
try
{
openFileDialog1.Title = "Select Bearings File";
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
using (StreamReader sr = new StreamReader(openFileDialog1.FileName))
{
string index;
string[] data;
string line;
while ((line = sr.ReadLine()) != null)
{
data = line.Split(',');
index = data[0].Trim();
if ((index == "1_2") && GeoUtilities.CheckBearing(data[1]))
{
textBoxBearing12.Text = data[1].Trim();
}
else if ((index == "1_3") && GeoUtilities.CheckBearing(data[1]))
{
textBoxBearing13.Text = data[1].Trim();
}
else if ((index == "2_3") && GeoUtilities.CheckBearing(data[1]))
{
textBoxBearing23.Text = data[1].Trim();
}
}
}
EnableSelectInputs();
}
}
catch (Exception ex)
{
ShowError(ex.Message);
}
}
public ConvexHull(float2[] points)
{
if (points.Length < 3)
{
throw new System.ArgumentException("A polygon need at least 3 points.", "points");
}
// 1. Sort the points by x-coordinate
float2[] orderedPoints = points.OrderBy(p => p.x).ThenBy(p => p.y).ToArray();
// 2. put the points p(1) and p(2) in a list *Upper Hull* with p1 as the first point
List <float2> upperHull = new List <float2>();
upperHull.Add(orderedPoints[0]);
upperHull.Add(orderedPoints[1]);
// 3. For i == 3 to n
for (int i = 2; i < orderedPoints.Length; i++)
{
// 4. Append p(i) to *Upper Hull*
upperHull.Add(orderedPoints[i]);
// 5. while *Upper Hull* contains more than 2 points and the
// last three points in *Upper Hull* do not make a right turn
while (upperHull.Count > 2 && GeoUtilities.CounterClockWise(upperHull[upperHull.Count - 1], upperHull[upperHull.Count - 2], upperHull[upperHull.Count - 3]))
{
// 6. do Delete the middle of the last three points from *Lower Hull*.
upperHull.RemoveAt(upperHull.Count - 2);
}
}
// 7. Put the points p(n) and p(n-1) in a *Lower Hull* list with p(n) as the first point.
List <float2> lowerHull = new List <float2>();
lowerHull.Add(orderedPoints[orderedPoints.Length - 1]);
lowerHull.Add(orderedPoints[orderedPoints.Length - 2]);
// 8. For i == n-3 to 1
for (int i = orderedPoints.Length - 3; i >= 0; i--)
{
// 9. Append p(i) to *Lower Hull*
lowerHull.Add(orderedPoints[i]);
// 10. While *Lower Hull* contains more than 2 points and the
// Las three points in *Lower Hull* do not make a right turn
while (lowerHull.Count > 2 && CounterClockWise(lowerHull[lowerHull.Count - 1], lowerHull[lowerHull.Count - 2], lowerHull[lowerHull.Count - 3]))
{
// 11. do Delete the middle of the last three points from *Lower Hull*.
lowerHull.RemoveAt(lowerHull.Count - 2);
}
}
// 12. Remothe the first and the last point from *Lower Hull* to avoid
// duplication of the points where the Upper and Lower Hull meet
lowerHull.RemoveAt(0);
lowerHull.RemoveAt(lowerHull.Count - 1);
// 13. Append *Lower Hull* to *Upper Hull* and call the resulting list *Hull*
upperHull.AddRange(lowerHull);
Vertices = upperHull.ToArray();
}
/// <summary>
/// Checks to see if the string is a valid coordinate.
/// </summary>
/// <param name="str">string to check</param>
/// <returns>true if the string can be converted to a valid coordinate value</returns>
private bool CheckCoords(string str)
{
return(GeoUtilities.CheckProjCoordinate(str) || GeoUtilities.CheckGeoCoordinate(str));
}
/// <summary>
/// Checks to see if a string is a valid bearing value.
/// </summary>
/// <param name="str">string to check</param>
/// <returns>true if the string is null or can be converted to a valid bearing, false if
/// not</returns>
private bool CheckBearing(string str)
{
return(string.IsNullOrEmpty(str) || GeoUtilities.CheckBearing(str));
}
