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Algoritmo de dibujo lineal de Bresenham VB.NET

Algoritmo de dibujo lineal de Bresenham EN VISUAL BASIC.NET Public Sub DrawLine(ByRef btmp As Bitmap, ByVal x As Integer, ByVal y As Integer, _                     ByVal endX As Integer, ByVal endY As Integer, ByVal newColor As Color)     Dim dx As Integer = Math.Abs(endX - x) ' calculate the change in x     Dim dy As Integer = Math.Abs(endY - y) ' calculate the change in y     Dim sx As Integer = Math.Sign(endX - x) ' calculate the sign of the change in x (pos/neg)     Dim sy As Integer = Math.Sign(endY - y) ' calculate the sign of the change in y (pos/neg)     Dim err As Integer = dx - dy ' calculate error (change in x minus change in y)     Dim e2 As Integer = 0 ' initialize twice error to zero     ' while the (x,y) vertex is not equal     ' to any of the (endX,endY) coordinates     While Not (x = endX AndAlso y = endY)         ' if the x- and y-coordinates are within the bounds of the image         If x >= 0 AndAlso x < btmp.Width AndAlso y