91 lines
3.1 KiB
VB.net
91 lines
3.1 KiB
VB.net
#Region "Microsoft.VisualBasic::52d1fd2850cb177372a640f45ef31dbe, Microsoft.VisualBasic.Core\Extensions\Image\GDI+\Layouts\ColaExtensions.vb"
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' Author:
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'
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' asuka (amethyst.asuka@gcmodeller.org)
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' xie (genetics@smrucc.org)
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' xieguigang (xie.guigang@live.com)
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'
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' Copyright (c) 2018 GPL3 Licensed
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'
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'
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' GNU GENERAL PUBLIC LICENSE (GPL3)
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'
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'
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' This program is free software: you can redistribute it and/or modify
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' it under the terms of the GNU General Public License as published by
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' the Free Software Foundation, either version 3 of the License, or
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' (at your option) any later version.
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'
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' This program is distributed in the hope that it will be useful,
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' but WITHOUT ANY WARRANTY; without even the implied warranty of
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' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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' GNU General Public License for more details.
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'
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' You should have received a copy of the GNU General Public License
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' along with this program. If not, see <http://www.gnu.org/licenses/>.
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' /********************************************************************************/
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' Summaries:
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' Module ColaExtensions
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'
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' Function: lineIntersections, rayIntersection
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'
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'
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' /********************************************************************************/
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#End Region
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Imports System.Runtime.CompilerServices
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Imports number = System.Double
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Namespace Imaging.LayoutModel
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Public Module ColaExtensions
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<Extension>
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Public Function lineIntersections(r As Rectangle2D, x1 As number, y1 As number, x2 As number, y2 As number) As List(Of Point2D)
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Dim sides = {
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New Double() {r.X, r.Y, r.Right, r.Y},
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New Double() {r.Right, r.Y, r.Right, r.Bottom},
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New Double() {r.Right, r.Bottom, r.X, r.Bottom},
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New Double() {r.X, r.Bottom, r.X, r.Y}
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}
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Dim intersections As New List(Of Point2D)
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For i As Integer = 0 To 3
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Dim p As Point2D = Rectangle2D.intersection(x1, y1, x2, y2, sides(i)(0), sides(i)(1), sides(i)(2), sides(i)(3))
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If Not p Is Nothing Then
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Call intersections.Add(p)
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End If
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Next
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Return intersections
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End Function
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''' <summary>
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''' return any intersection points between a line extending from the centre of this rectangle to the given point,
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''' And the sides of this rectangle
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''' </summary>
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''' <param name="x2">second x coord of line</param>
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''' <param name="y2">second y coord of line</param>
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''' <returns>any intersection points found</returns>
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'''
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<Extension>
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Public Function rayIntersection(this As Rectangle2D, x2 As number, y2 As number) As Point2D
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Dim ints = this.lineIntersections(this.CenterX, this.CenterY, x2, y2)
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If ints.Count > 0 Then
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Return ints(Scan0)
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Else
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Return Nothing
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End If
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End Function
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End Module
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End Namespace
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