/// <summary>
/// Get a line segment intersect point.
/// </summary>
/// <param name="vector">Point.</param>
/// <param name="point1">Line Point 1.</param>
/// <param name="point2">Line Point 2.</param>
/// <returns>Return value.</returns>
public static Vector2 IntersectLineSegment(this Vector2 vector, Vector2 point1, Vector2 point2)
{
var dir = point1 - point2;
dir.Normalize();
var point = (dir * Vector2.Dot(vector - point1, dir)) + point1;
Bound2 bound;
Bound2.FromPoints(ref point1, ref point2, out bound);
if (!bound.Intersects(point))
{
if ((vector - point1).magnitude <= (vector - point2).magnitude)
{
return(point1);
}
else
{
return(point2);
}
}
return(point);
}
/// <summary>
/// Create bound around points.
/// </summary>
/// <param name="point1">Point1.</param>
/// <param name="point2">Point2.</param>
/// <param name="result">Bound result.</param>
public static void FromPoints(ref Vector2 point1, ref Vector2 point2, out Bound2 result)
{
result.left = point1.x;
result.right = point1.x;
result.bottom = point1.y;
result.top = point1.y;
if (point2.x < result.left)
{
result.left = point2.x;
}
if (point2.x > result.right)
{
result.right = point2.x;
}
if (point2.y < result.bottom)
{
result.bottom = point2.y;
}
if (point2.y > result.top)
{
result.top = point2.y;
}
}
/// <summary>
/// Create bound around points.
/// </summary>
/// <param name="point1">Point1.</param>
/// <param name="point2">Point2.</param>
/// <param name="result">Bound result.</param>
public static void FromPoints(ref Vector2 point1, ref Vector2 point2, out Bound2 result)
{
result.left = point1.x;
result.right = point1.x;
result.bottom = point1.y;
result.top = point1.y;
if (point2.x < result.left) result.left = point2.x;
if (point2.x > result.right) result.right = point2.x;
if (point2.y < result.bottom) result.bottom = point2.y;
if (point2.y > result.top) result.top = point2.y;
}
