Bilinear interpolation: Difference between revisions
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Line 159:
im.rescaleGray(1.3, 1.8).savePGM("lena_larger.pgm");
}</lang>
=={{header|F#|F sharp}}==
{{trans|C#}}
<lang fsharp>open System
open System.Drawing
let lerp (s:float) (e:float) (t:float) =
s + (e - s) * t
let blerp c00 c10 c01 c11 tx ty =
lerp (lerp c00 c10 tx) (lerp c01 c11 tx) ty
let scale (self:Bitmap) (scaleX:float) (scaleY:float) =
let newWidth = int ((float self.Width) * scaleX)
let newHeight = int ((float self.Height) * scaleY)
let newImage = new Bitmap(newWidth, newHeight, self.PixelFormat)
for x in 0..newWidth-1 do
for y in 0..newHeight-1 do
let gx = (float x) / (float newWidth) * (float (self.Width - 1))
let gy = (float y) / (float newHeight) * (float (self.Height - 1))
let gxi = int gx
let gyi = int gy
let c00 = self.GetPixel(gxi, gyi)
let c10 = self.GetPixel(gxi + 1, gyi)
let c01 = self.GetPixel(gxi, gyi + 1)
let c11 = self.GetPixel(gxi + 1, gyi + 1)
let red = int (blerp (float c00.R) (float c10.R) (float c01.R) (float c11.R) (gx - (float gxi)) (gy - (float gyi)))
let green = int (blerp (float c00.G) (float c10.G) (float c01.G) (float c11.G) (gx - (float gxi)) (gy - (float gyi)))
let blue = int (blerp (float c00.B) (float c10.B) (float c01.B) (float c11.B) (gx - (float gxi)) (gy - (float gyi)))
let rgb = Color.FromArgb(red, green, blue)
newImage.SetPixel(x, y, rgb)
newImage
// Taken from https://stackoverflow.com/a/2362114
let castAs<'T when 'T : null> (o:obj) =
match o with
| :? 'T as res -> res
| _ -> Unchecked.defaultof<'T>
[<EntryPoint>]
let main _ =
let newImage = Image.FromFile("Lenna100.jpg")
let oi = castAs<Bitmap>(newImage)
if oi = null then
Console.WriteLine("Could not open the source file.")
else
let result = scale oi 1.6 1.6
result.Save("Lenna100_larger.jpg")
0 // return an integer exit code</lang>
=={{header|Go}}==
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