public static Rectangle Union( params Rectangle[] rects )
{
Rectangle union = new Rectangle( 0, 0, 0, 0 );
foreach( Rectangle rect in rects )
{
if( union.Width == 0 || union.Height == 0 )
{
union = rect;
}
else if( rect.Width != 0 && rect.Height != 0 )
{
double x = Math.Min( union.X, rect.X);
double y = Math.Min( union.Y, rect.Y );
double right = Math.Max( union.Right, rect.Right );
double bottom = Math.Max( union.Bottom, rect.Bottom );
union = new Rectangle( x, y, right - x, bottom - y );
}
}
return union;
}
public static Rectangle Shrink( Rectangle rect, double by )
{
return new Rectangle( rect.X + by, rect.Y + by, rect.Width - by * 2, rect.Height - by * 2 );
}
public static Rectangle Offset( Rectangle rect, Point offset )
{
return new Rectangle( rect.X + offset.X, rect.Y + offset.Y, rect.Width, rect.Height );
}
public static bool Overlap( Rectangle r1, Rectangle r2 )
{
if( r1 == null )
{
throw new ArgumentNullException( "r1" );
}
if( r2 == null )
{
throw new ArgumentNullException( "r2" );
}
if( r1.Right < r2.Left || r2.Right < r1.Left )
{
return false;
}
if( r1.Bottom < r2.Top || r2.Bottom < r1.Top )
{
return false;
}
return true;
}
public static Rectangle Expand( Rectangle rect, double by )
{
return new Rectangle( rect.X - by, rect.Y - by, rect.Width + by * 2, rect.Height + by * 2 );
}