You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
87 lines
3.2 KiB
87 lines
3.2 KiB
/*************************************************************************************
|
|
|
|
Toolkit for WPF
|
|
|
|
Copyright (C) 2007-2020 Xceed Software Inc.
|
|
|
|
This program is provided to you under the terms of the XCEED SOFTWARE, INC.
|
|
COMMUNITY LICENSE AGREEMENT (for non-commercial use) as published at
|
|
https://github.com/xceedsoftware/wpftoolkit/blob/master/license.md
|
|
|
|
For more features, controls, and fast professional support,
|
|
pick up the Plus Edition at https://xceed.com/xceed-toolkit-plus-for-wpf/
|
|
|
|
Stay informed: follow @datagrid on Twitter or Like http://facebook.com/datagrids
|
|
|
|
***********************************************************************************/
|
|
|
|
using System;
|
|
using System.Windows;
|
|
|
|
namespace Xceed.Wpf.Toolkit.Core.Utilities
|
|
{
|
|
internal static class RectHelper
|
|
{
|
|
public static Point Center( Rect rect )
|
|
{
|
|
return new Point( rect.Left + rect.Width / 2, rect.Top + rect.Height / 2 );
|
|
}
|
|
|
|
public static Nullable<Point> GetNearestPointOfIntersectionBetweenRectAndSegment( Rect rect, Segment segment, Point point )
|
|
{
|
|
Nullable<Point> result = null;
|
|
double distance = double.PositiveInfinity;
|
|
|
|
Segment leftIntersection = segment.Intersection( new Segment( rect.BottomLeft, rect.TopLeft ) );
|
|
Segment topIntersection = segment.Intersection( new Segment( rect.TopLeft, rect.TopRight ) );
|
|
Segment rightIntersection = segment.Intersection( new Segment( rect.TopRight, rect.BottomRight ) );
|
|
Segment bottomIntersection = segment.Intersection( new Segment( rect.BottomRight, rect.BottomLeft ) );
|
|
|
|
RectHelper.AdjustResultForIntersectionWithSide( ref result, ref distance, leftIntersection, point );
|
|
RectHelper.AdjustResultForIntersectionWithSide( ref result, ref distance, topIntersection, point );
|
|
RectHelper.AdjustResultForIntersectionWithSide( ref result, ref distance, rightIntersection, point );
|
|
RectHelper.AdjustResultForIntersectionWithSide( ref result, ref distance, bottomIntersection, point );
|
|
|
|
return result;
|
|
}
|
|
|
|
public static Rect GetRectCenteredOnPoint( Point center, Size size )
|
|
{
|
|
return new Rect( new Point( center.X - size.Width / 2, center.Y - size.Height / 2 ), size );
|
|
}
|
|
|
|
private static void AdjustResultForIntersectionWithSide( ref Nullable<Point> result, ref double distance, Segment intersection, Point point )
|
|
{
|
|
if( !intersection.IsEmpty )
|
|
{
|
|
if( intersection.Contains( point ) )
|
|
{
|
|
distance = 0;
|
|
result = point;
|
|
return;
|
|
}
|
|
|
|
double p1Distance = PointHelper.DistanceBetween( point, intersection.P1 );
|
|
double p2Distance = double.PositiveInfinity;
|
|
if( !intersection.IsPoint )
|
|
{
|
|
p2Distance = PointHelper.DistanceBetween( point, intersection.P2 );
|
|
}
|
|
|
|
if( Math.Min( p1Distance, p2Distance ) < distance )
|
|
{
|
|
if( p1Distance < p2Distance )
|
|
{
|
|
distance = p1Distance;
|
|
result = intersection.P1;
|
|
}
|
|
else
|
|
{
|
|
distance = p2Distance;
|
|
result = intersection.P2;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|