public CLine(CPoint2D point1, CPoint2D point2)
{
try
{
if (CPoint2D.SamePoints(point1, point2))
{
string errMsg = "The input points are the same";
InvalidInputGeometryDataException ex = new
InvalidInputGeometryDataException(errMsg);
throw ex;
}
//Point1 and Point2 are different points:
if (Math.Abs(point1.X - point2.X)
< ConstantValue.SmallValue) //vertical line
{
Initialize(Math.PI / 2, point1);
}
else if (Math.Abs(point1.Y - point2.Y)
< ConstantValue.SmallValue) //Horizontal line
{
Initialize(0, point1);
}
else //normal line
{
double m = (point2.Y - point1.Y) / (point2.X - point1.X);
double alphaInRad = Math.Atan(m);
Initialize(alphaInRad, point1);
}
}
catch (Exception e)
{
System.Diagnostics.Trace.WriteLine(e.Message + e.StackTrace);
}
}
//-----------------------------------------------------------------------------------------
public CPolygon(CPoint2D[] _points, int[] _index)
{
int numPoints = _index.Length;
try
{
if (numPoints < 3)
{
InvalidInputGeometryDataException ex = new InvalidInputGeometryDataException();
throw ex;
}
else
{
m_aVertices = new CPoint2D[numPoints];
for (int i = 0; i < numPoints; i++)
{
m_aVertices[i] = _points[_index[i]];
}
}
}
catch (Exception e)
{
System.Diagnostics.Trace.WriteLine(e.Message + e.StackTrace);
}
}
private void Initialize(Double angleInRad, CPoint2D point)
{
//angleInRad should be between 0-Pi
try
{
//if ((angleInRad<0) ||(angleInRad>Math.PI))
if (angleInRad > 2 * Math.PI)
{
string errMsg = string.Format(
"The input line angle" +
" {0} is wrong. It should be between 0-2*PI.", angleInRad);
InvalidInputGeometryDataException ex = new
InvalidInputGeometryDataException(errMsg);
throw ex;
}
if (Math.Abs(angleInRad - Math.PI / 2) <
ConstantValue.SmallValue) //vertical line
{
a = 1;
b = 0;
c = -point.X;
}
else //not vertical line
{
a = -Math.Tan(angleInRad);
b = 1;
c = -a * point.X - b * point.Y;
}
}
catch (Exception e)
{
System.Diagnostics.Trace.WriteLine(e.Message + e.StackTrace);
}
}