/*** Distance between two points***/
public double DistanceTo(CPoint2D point)
{
return(Math.Sqrt((point.X - this.X) * (point.X - this.X)
+ (point.Y - this.Y) * (point.Y - this.Y)));
}
/************************************************
* Offset the line segment to generate a new line segment
* If the offset direction is along the x-axis or y-axis,
* Parameter is true, other wise it is false
* ***********************************************/
public CLineSegment OffsetLine(double distance, bool rightOrDown)
{
//offset a line with a given distance, generate a new line
//rightOrDown=true means offset to x incress direction,
// if the line is horizontal, offset to y incress direction
CLineSegment line;
CPoint2D newStartPoint = new CPoint2D();
CPoint2D newEndPoint = new CPoint2D();
double alphaInRad = this.GetLineAngle(); // 0-PI
if (rightOrDown)
{
if (this.HorizontalLine()) //offset to y+ direction
{
newStartPoint.X = this.m_startPoint.X;
newStartPoint.Y = this.m_startPoint.Y + distance;
newEndPoint.X = this.m_endPoint.X;
newEndPoint.Y = this.m_endPoint.Y + distance;
line = new CLineSegment(newStartPoint, newEndPoint);
}
else //offset to x+ direction
{
if (Math.Sin(alphaInRad) > 0)
{
newStartPoint.X = m_startPoint.X + Math.Abs(distance * Math.Sin(alphaInRad));
newStartPoint.Y = m_startPoint.Y - Math.Abs(distance * Math.Cos(alphaInRad));
newEndPoint.X = m_endPoint.X + Math.Abs(distance * Math.Sin(alphaInRad));
newEndPoint.Y = m_endPoint.Y - Math.Abs(distance * Math.Cos(alphaInRad));
line = new CLineSegment(
newStartPoint, newEndPoint);
}
else //sin(FalphaInRad)<0
{
newStartPoint.X = m_startPoint.X + Math.Abs(distance * Math.Sin(alphaInRad));
newStartPoint.Y = m_startPoint.Y + Math.Abs(distance * Math.Cos(alphaInRad));
newEndPoint.X = m_endPoint.X + Math.Abs(distance * Math.Sin(alphaInRad));
newEndPoint.Y = m_endPoint.Y + Math.Abs(distance * Math.Cos(alphaInRad));
line = new CLineSegment(
newStartPoint, newEndPoint);
}
}
} //{rightOrDown}
else //leftOrUp
{
if (this.HorizontalLine()) //offset to y directin
{
newStartPoint.X = m_startPoint.X;
newStartPoint.Y = m_startPoint.Y - distance;
newEndPoint.X = m_endPoint.X;
newEndPoint.Y = m_endPoint.Y - distance;
line = new CLineSegment(
newStartPoint, newEndPoint);
}
else //offset to x directin
{
if (Math.Sin(alphaInRad) >= 0)
{
newStartPoint.X = m_startPoint.X - Math.Abs(distance * Math.Sin(alphaInRad));
newStartPoint.Y = m_startPoint.Y + Math.Abs(distance * Math.Cos(alphaInRad));
newEndPoint.X = m_endPoint.X - Math.Abs(distance * Math.Sin(alphaInRad));
newEndPoint.Y = m_endPoint.Y + Math.Abs(distance * Math.Cos(alphaInRad));
line = new CLineSegment(
newStartPoint, newEndPoint);
}
else //sin(FalphaInRad)<0
{
newStartPoint.X = m_startPoint.X - Math.Abs(distance * Math.Sin(alphaInRad));
newStartPoint.Y = m_startPoint.Y - Math.Abs(distance * Math.Cos(alphaInRad));
newEndPoint.X = m_endPoint.X - Math.Abs(distance * Math.Sin(alphaInRad));
newEndPoint.Y = m_endPoint.Y - Math.Abs(distance * Math.Cos(alphaInRad));
line = new CLineSegment(
newStartPoint, newEndPoint);
}
}
}
return(line);
}
public CLine(Double angleInRad, CPoint2D point)
{
Initialize(angleInRad, point);
}
public CLineSegment(CPoint2D startPoint, CPoint2D endPoint)
: base(startPoint, endPoint)
{
this.m_startPoint = startPoint;
this.m_endPoint = endPoint;
}