/// <summary>
/// Checks whether the specified rectangle intersects the passed circle.
/// </summary>
/// <param name="rectangle">
/// Rectangle to check.
/// </param>
/// <param name="circle">
/// Circle to check.
/// </param>
/// <returns>
/// <c>true</c>, if rectangle and circle intersect each other, and <c>false</c> otherwise.
/// </returns>
public static bool Intersects(this RectangleF rectangle, CircleF circle)
{
// Check if rectangle contains center.
if (rectangle.Contains(circle.Center))
{
return(true);
}
// Check each edge.
var topLeft = new Vector2F(rectangle.X, rectangle.Y);
var bottomLeft = new Vector2F(rectangle.X, rectangle.MaxY);
var topRight = new Vector2F(rectangle.MaxX, rectangle.Y);
var bottomRight = new Vector2F(rectangle.MaxX, rectangle.MaxY);
var left = new LineSegment2F(topLeft, bottomLeft);
var right = new LineSegment2F(topRight, bottomRight);
var top = new LineSegment2F(topLeft, topRight);
var bottom = new LineSegment2F(bottomLeft, bottomRight);
return(left.Intersects(circle) || right.Intersects(circle) || top.Intersects(circle) ||
bottom.Intersects(circle));
}
/// <summary>
/// Checks whether the specified line intersects the passed circle.
/// </summary>
/// <param name="line">
/// Line to check.
/// </param>
/// <param name="circle">
/// Circle to check.
/// </param>
/// <returns>
/// <c>true</c>, if line and circle intersect each other, and <c>false</c> otherwise.
/// </returns>
public static bool Intersects(this LineSegment2F line, CircleF circle)
{
return(line.GetDistance(circle.Center) < circle.Radius);
}
/// <summary>
/// Checks whether the specified circle intersects the passed rectangle.
/// </summary>
/// <param name="circle">
/// Circle to check.
/// </param>
/// <param name="rectangle">
/// Rectangle to check.
/// </param>
/// <returns>
/// <c>true</c>, if circle and rectangle intersect each other, and <c>false</c> otherwise.
/// </returns>
public static bool Intersects(this CircleF circle, RectangleF rectangle)
{
return(rectangle.Intersects(circle));
}
/// <summary>
/// Checks whether the specified circle intersects the passed line.
/// </summary>
/// <param name="circle">
/// Circle to check.
/// </param>
/// <param name="line">
/// Line to check.
/// </param>
/// <returns>
/// <c>true</c>, if circle and line intersect each other, and <c>false</c> otherwise.
/// </returns>
public static bool Intersects(this CircleF circle, LineSegment2F line)
{
return(line.Intersects(circle));
}