Bilinear interpolation: Difference between revisions
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m (Fixed mistake in color blerp) |
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</lang>
=={{header|Visual Basic .NET}}==
{{trans|C#}}
<lang vbnet>Imports System.Drawing
Module Module1
Function Lerp(s As Single, e As Single, t As Single) As Single
Return s + (e - s) * t
End Function
Function Blerp(c00 As Single, c10 As Single, c01 As Single, c11 As Single, tx As Single, ty As Single) As Single
Return Lerp(Lerp(c00, c10, tx), Lerp(c01, c11, tx), ty)
End Function
Function Scale(self As Bitmap, scaleX As Single, scaleY As Single) As Image
Dim newWidth = CInt(Math.Floor(self.Width * scaleX))
Dim newHeight = CInt(Math.Floor(self.Height * scaleY))
Dim newImage As New Bitmap(newWidth, newHeight, self.PixelFormat)
For x = 0 To newWidth - 1
For y = 0 To newHeight - 1
Dim gx = CSng(x) / newWidth * (self.Width - 1)
Dim gy = CSng(y) / newHeight * (self.Height - 1)
Dim gxi = CInt(Math.Floor(gx))
Dim gyi = CInt(Math.Floor(gy))
Dim c00 = self.GetPixel(gxi, gyi)
Dim c10 = self.GetPixel(gxi + 1, gyi)
Dim c01 = self.GetPixel(gxi, gyi + 1)
Dim c11 = self.GetPixel(gxi + 1, gyi + 1)
Dim red = CInt(Blerp(c00.R, c10.R, c01.R, c11.R, gx - gxi, gy - gyi))
Dim green = CInt(Blerp(c00.G, c10.G, c01.G, c11.G, gx - gxi, gy - gyi))
Dim blue = CInt(Blerp(c00.B, c10.B, c01.B, c11.B, gx - gxi, gy - gyi))
Dim rgb = Color.FromArgb(red, green, blue)
newImage.SetPixel(x, y, rgb)
Next
Next
Return newImage
End Function
Sub Main()
Dim newImage = Image.FromFile("Lenna100.jpg")
If TypeOf newImage Is Bitmap Then
Dim oi As Bitmap = newImage
Dim result = Scale(oi, 1.6, 1.6)
result.Save("Lenna100_larger.jpg")
Else
Console.WriteLine("Could not open the source file.")
End If
End Sub
End Module</lang>
=={{header|zkl}}==
{{trans|C}}
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