/// <summary>
/// Determines whether a given point is inside and close to the edge of a given rectangle.
/// </summary>
/// <param name="rectangle">The rectangle within which the point should be located.</param>
/// <param name="test">The point to test for.</param>
/// <param name="tolerance">
/// The tolerance. This is subtracted from the bounds of the rectangle to create a border within which the
/// <paramref
/// name="test" />
/// point must be located.
/// </param>
/// <param name="toTest">The edges that should be tested.</param>
/// <returns>A combination of Edge flags depending on which edges the point is close to.</returns>
internal static Edge IsPointOnEdge( RectangleF rectangle, PointF test, float tolerance, EdgeTest toTest )
{
// If the point is not within the rectangle, then there is no need for further tests.
if( !rectangle.Contains( test ) ) {
return Edge.None;
}
Edge result = Edge.None;
// Test vertical edges.
if( ( toTest & EdgeTest.Vertical ) != 0 ) {
if( test.Y >= rectangle.Y && test.Y <= rectangle.Y + tolerance ) {
result |= Edge.Top;
}
if( test.Y <= rectangle.Y + rectangle.Height && test.Y >= rectangle.Y + rectangle.Height - tolerance ) {
result |= Edge.Bottom;
}
}
// Test horizontal edges.
if( ( toTest & EdgeTest.Horizontal ) != 0 ) {
if( test.X <= rectangle.X + rectangle.Width && test.X >= rectangle.X + rectangle.Width - tolerance ) {
result |= Edge.Right;
}
if( test.X >= rectangle.X && test.X <= rectangle.X + tolerance ) {
result |= Edge.Left;
}
}
return result;
}
/// <summary>
/// Determines whether a given point is inside and close to the edge of a given rectangle.
/// </summary>
/// <param name="rectangle">The rectangle within which the point should be located.</param>
/// <param name="test">The point to test for.</param>
/// <param name="tolerance">
/// The tolerance. This is subtracted from the bounds of the rectangle to create a border within which the
/// <paramref
/// name="test" />
/// point must be located.
/// </param>
/// <param name="toTest">The edges that should be tested.</param>
/// <returns>A combination of Edge flags depending on which edges the point is close to.</returns>
internal static Edge IsPointOnEdge(RectangleF rectangle, PointF test, float tolerance, EdgeTest toTest)
{
// If the point is not within the rectangle, then there is no need for further tests.
if (!rectangle.Contains(test))
{
return(Edge.None);
}
Edge result = Edge.None;
// Test vertical edges.
if ((toTest & EdgeTest.Vertical) != 0)
{
if (test.Y >= rectangle.Y && test.Y <= rectangle.Y + tolerance)
{
result |= Edge.Top;
}
if (test.Y <= rectangle.Y + rectangle.Height && test.Y >= rectangle.Y + rectangle.Height - tolerance)
{
result |= Edge.Bottom;
}
}
// Test horizontal edges.
if ((toTest & EdgeTest.Horizontal) != 0)
{
if (test.X <= rectangle.X + rectangle.Width && test.X >= rectangle.X + rectangle.Width - tolerance)
{
result |= Edge.Right;
}
if (test.X >= rectangle.X && test.X <= rectangle.X + tolerance)
{
result |= Edge.Left;
}
}
return(result);
}
