public override bool Equals(object obj)
{
// If the object is not of the same type then it cannot be equal
if (!(obj is LineSegment2D))
{
return(false);
}
LineSegment2D s = (LineSegment2D)obj;
return(this.m_p1.Equals(s.m_p1) && this.m_p2.Equals(s.m_p2));
}
public bool IsParallel(LineSegment2D seg2)
{
// The two segments will be parallel if their line vectors are the same
// or one is the negative of the other.
EOFC.Vector2D v1 = GetVector();
EOFC.Vector2D v2 = seg2.GetVector();
v1.Normalize();
v2.Normalize();
if (v1.DotProduct(v2) == 1.0f)
{
return(true);
}
return(false);
}
public bool Intersects(LineSegment2D segment2, ref EOFC.Vector2D outISectPt)
{
float t = 0.0f;
if (!Intersects(segment2, ref t))
{
return(false);
}
// Fill the intersection point
float dx1 = m_p2.X - m_p1.X;
float dy1 = m_p2.Y - m_p1.Y;
outISectPt.Set(m_p1.X + t * dx1, m_p1.Y + t * dy1);
return(true);
}
/// <summary>
/// Determines whether or not this segment intersects another. If the two segments
/// do intersect, then t will be set to a value in the range [0.0f, 1.0f] indicating
/// where the intersection occurs along this line, and true will be returned. If no
/// intersection occurs, false is returned and t is not modified.
/// </summary>
/// <returns>True if the segments intersect, false otherwise.</returns>
public bool Intersects(LineSegment2D segment2, ref float t)
{
// Build directional vectors for both lines. Negate the ones for the
// second segment by flipping the subtraction order.
float dx1 = m_p2.X - m_p1.X;
float dy1 = m_p2.Y - m_p1.Y;
float dx2 = segment2.m_p1.X - segment2.m_p2.X;
float dy2 = segment2.m_p1.Y - segment2.m_p2.Y;
// Calculate determinate
float det = (dx1 * dy2) - (dx2 * dy1);
// If the determinate is zero then there is no intersection
if (0.0f == det)
{
return(false);
}
// Calculate origin differences
float ox = segment2.m_p1.X - m_p1.X;
float oy = segment2.m_p1.Y - m_p1.Y;
// Calculate t1 and test bounds
float t1 = (ox * dy2 - dx2 * oy) / det;
if (t1 < 0.0f || t1 > 1.0f)
{
return(false);
}
// Calculate t2 and test bounds
float t2 = (dx1 * oy - ox * dy1) / det;
if (t2 < 0.0f || t2 > 1.0f)
{
return(false);
}
// Both t-values are in range, fill output t value
t = t1;
return(true);
}
public LineSegment2D(LineSegment2D copyme)
{
m_p1 = copyme.m_p1;
m_p2 = copyme.m_p2;
m_l = (m_p2 - m_p1).Length;
}
public bool IsParallel(LineSegment2D seg2)
{
// The two segments will be parallel if their line vectors are the same
// or one is the negative of the other.
EOFC.Vector2D v1 = GetVector();
EOFC.Vector2D v2 = seg2.GetVector();
v1.Normalize();
v2.Normalize();
if (v1.DotProduct(v2) == 1.0f)
{
return true;
}
return false;
}
public LineSegment2D(LineSegment2D copyme)
{
m_p1 = copyme.m_p1;
m_p2 = copyme.m_p2;
m_l = (m_p2 - m_p1).Length;
}
/// <summary>
/// Determines whether or not this segment intersects another. If the two segments
/// do intersect, then t will be set to a value in the range [0.0f, 1.0f] indicating
/// where the intersection occurs along this line, and true will be returned. If no
/// intersection occurs, false is returned and t is not modified.
/// </summary>
/// <returns>True if the segments intersect, false otherwise.</returns>
public bool Intersects(LineSegment2D segment2, ref float t)
{
// Build directional vectors for both lines. Negate the ones for the
// second segment by flipping the subtraction order.
float dx1 = m_p2.X - m_p1.X;
float dy1 = m_p2.Y - m_p1.Y;
float dx2 = segment2.m_p1.X - segment2.m_p2.X;
float dy2 = segment2.m_p1.Y - segment2.m_p2.Y;
// Calculate determinate
float det = (dx1 * dy2) - (dx2 * dy1);
// If the determinate is zero then there is no intersection
if (0.0f == det)
{
return false;
}
// Calculate origin differences
float ox = segment2.m_p1.X - m_p1.X;
float oy = segment2.m_p1.Y - m_p1.Y;
// Calculate t1 and test bounds
float t1 = (ox * dy2 - dx2 * oy) / det;
if (t1 < 0.0f || t1 > 1.0f)
{
return false;
}
// Calculate t2 and test bounds
float t2 = (dx1 * oy - ox * dy1) / det;
if (t2 < 0.0f || t2 > 1.0f)
{
return false;
}
// Both t-values are in range, fill output t value
t = t1;
return true;
}
public bool Intersects(LineSegment2D segment2, ref EOFC.Vector2D outISectPt)
{
float t = 0.0f;
if (!Intersects(segment2, ref t))
{
return false;
}
// Fill the intersection point
float dx1 = m_p2.X - m_p1.X;
float dy1 = m_p2.Y - m_p1.Y;
outISectPt.Set(m_p1.X + t * dx1, m_p1.Y + t * dy1);
return true;
}
