/// <summary>
/// Calculates the intersection of this line with the given line.
/// </summary>
/// <param name="other">Other.</param>
/// <param name="finiteThis">If set to <c>true</c> this line is finite.</param>
/// <param name="finiteOther">If set to <c>true</c> the other line is finite.</param>
/// <param name="intersection">Intersection.</param>
public bool Intersects(Line2d other, bool finiteThis, bool finiteOther, out Vector2 intersection)
{
intersection = Vector2.zero;
Vector2 b = m_PointB - m_PointA;
Vector2 d = other.pointB - other.pointA;
float bDotDPerp = b.x * d.y - b.y * d.x;
// If bDotDPerp is 0 it means the lines are parallel.
if (HydraMathUtils.Approximately(bDotDPerp, 0.0f))
return false;
Vector2 c = other.pointA - m_PointA;
float t = (c.x * d.y - c.y * d.x) / bDotDPerp;
if (finiteThis && (t < 0.0f || t > 1.0f))
return false;
float u = (c.x * b.y - c.y * b.x) / bDotDPerp;
if (finiteOther && (u < 0.0f || u > 1.0f))
return false;
intersection = m_PointA + t * b;
return true;
}
/// <summary>
/// Returns the number of intersections with the given rectangle.
/// </summary>
/// <param name="rect">Rect.</param>
/// <param name="finiteThis">If set to <c>true</c> this line is finite.</param>
/// <param name="intersections">Intersections.</param>
public int Intersects(Rect rect, bool finiteThis, ref Vector2[] intersections)
{
int output = 0;
Array.Resize(ref intersections, 4);
Vector2 topLeft = rect.GetTopLeft();
Vector2 topRight = rect.GetTopRight();
Vector2 bottomLeft = rect.GetBottomLeft();
Vector2 bottomRight = rect.GetBottomRight();
Line2d top = new Line2d(topLeft, topRight);
Line2d bottom = new Line2d(bottomLeft, bottomRight);
Line2d left = new Line2d(topLeft, bottomLeft);
Line2d right = new Line2d(topRight, bottomRight);
Vector2 intersection;
if (Intersects(top, finiteThis, true, out intersection))
{
intersections[output] = intersection;
output++;
}
if (Intersects(bottom, finiteThis, true, out intersection))
{
intersections[output] = intersection;
output++;
}
if (Intersects(left, finiteThis, true, out intersection))
{
intersections[output] = intersection;
output++;
}
if (Intersects(right, finiteThis, true, out intersection))
{
intersections[output] = intersection;
output++;
}
return(output);
}
/// <summary>
/// Returns true if the line intersects the given line. Both lines are
/// considered finite.
/// </summary>
/// <param name="other">Other.</param>
/// <param name="intersection">Intersection.</param>
public bool Intersects(Line2d other, out Vector2 intersection)
{
return(Intersects(other, true, true, out intersection));
}
/// <summary>
/// Returns true if the line intersects the given line. Both lines are
/// considered finite.
/// </summary>
/// <param name="other">Other.</param>
/// <param name="intersection">Intersection.</param>
public bool Intersects(Line2d other, out Vector2 intersection)
{
return Intersects(other, true, true, out intersection);
}
/// <summary>
/// Returns the number of intersections with the given rectangle.
/// </summary>
/// <param name="rect">Rect.</param>
/// <param name="finiteThis">If set to <c>true</c> this line is finite.</param>
/// <param name="intersections">Intersections.</param>
public int Intersects(Rect rect, bool finiteThis, ref Vector2[] intersections)
{
int output = 0;
Array.Resize(ref intersections, 4);
Vector2 topLeft = rect.GetTopLeft();
Vector2 topRight = rect.GetTopRight();
Vector2 bottomLeft = rect.GetBottomLeft();
Vector2 bottomRight = rect.GetBottomRight();
Line2d top = new Line2d(topLeft, topRight);
Line2d bottom = new Line2d(bottomLeft, bottomRight);
Line2d left = new Line2d(topLeft, bottomLeft);
Line2d right = new Line2d(topRight, bottomRight);
Vector2 intersection;
if (Intersects(top, finiteThis, true, out intersection))
{
intersections[output] = intersection;
output++;
}
if (Intersects(bottom, finiteThis, true, out intersection))
{
intersections[output] = intersection;
output++;
}
if (Intersects(left, finiteThis, true, out intersection))
{
intersections[output] = intersection;
output++;
}
if (Intersects(right, finiteThis, true, out intersection))
{
intersections[output] = intersection;
output++;
}
return output;
}
/// <summary>
/// Draws the line.
/// </summary>
/// <param name="line">Line.</param>
/// <param name="color">Color.</param>
/// <param name="duration">Duration.</param>
public static void DrawLine(Line2d line, Color color, float duration)
{
Debug.DrawLine(line.pointA, line.pointB, color, duration);
}
