Question

I am trying to get the current pixel in an image by a “OnMouseMove event” Using Scanline.

something equivalent to this:

Label1.Caption := IntToStr(Image1.Picture.Bitmap.Canvas.Pixels[X,Y]);

Any ideas ?

Answer 1

ScanLine returns a pointer to a packed array of pixels that constitutes one line of a bitmap. Using this pointer you can access these pixels fast.

ScanLine can’t help if you need only one pixel.

Still you can use ScanLine here; assuming bitmap pixel format pf32bit:

Label1.Caption:= IntToStr(PIntegerArray(Image1.Picture.Bitmap.ScanLine[Y])^[X]);