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javaandroidmotioneventandroid-bitmap

Convert RGB to X and Y in a bitmap


I have a code which takes a bitmap and converts the X and Y coordinate to RGB:

int pixel = bitmap.getPixel((int)x,(int) y);
inRed = Color.red(pixel);
inBlue = Color.blue(pixel);
inGreen = Color.green(pixel);

How do I convert a given RGB and get the X and Y coordinate within the bitmap?


Solution

  • To find the first pixel in a Bitmap with given Color:

    int color = // your color
    int x, y; // used for output
    boolean found = false;
    for (int ix = 0; ix < bitmap.getWidth(); ++ix) {
      for (int iy = 0; iy < bitmap.getHeight(); ++iy) {
        if (color == bitmap.getPixel(ix, iy) {
          found = true;
          x = ix;
          y = iy;
          break;
        }
      }
    }