Android Question Read x,y from getPixels

Discussion in 'Android Questions' started by Fusseldieb, Aug 17, 2015.

  1. Fusseldieb

    Fusseldieb Active Member Licensed User

    Hi,
    I use getPixels() to get pixels from the entire image and I realize that I can read one pixel at a time defining 0,0 or 0,1 and so on, but everytime I use that funcion, it slows the app down. Knowing that, I want to read the entire image at once, store it into an Integer and read later with x and y.

    Code:
    Dim p() As Int

    p=getPixels(Canvas1.Bitmap,
    0,X,Y,Canvas1.Bitmap.Width,Canvas1.Bitmap.Height)
    Here I read the entire image, but how can i later read an x and y coordinate? Like this:

    Code:
    p(12,49)
    Obviously that doesn't work, but I can't figure out how to make that work.
     
  2. stevel05

    stevel05 Expert Licensed User

    From a quick test it appears that the returned array holds rows of pixels in sequence. So if the bitmap is 10 x 10, the contents of the array indices 0-9 will be row 1, 10 - 19 will be row 2 etc.

    So you can access each pixel as
    Code:
    Pixels(X + Y * ImageWidth)
     
    Fusseldieb and DonManfred like this.
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