Hi.
--- In [email protected], "swzoh" <[EMAIL PROTECTED]> wrote:
> 1 pixel up and 2 pixel down is 2 pixel, not 3
> pixel?
Uhm, yes. Or not?
> Anyway, adding 1 pixel really improves the behavior. So, possibly
my
> conception of pixel is wrong, I tend to think pixel as a
mathematical
> point which I always felt may not be quite correct.
It might be close to a mathematical point because it is very small
but to me it is not a point, because it takes some physical space.
It has width of 1 pixel and a height of 1 pixel.
OK. I thought this over a bit and here is my approach:
I'd try to avoid any dividing to avoid rounding mistakes and to get
an exactly enlarged picture.
So starting from the smallest I define a radius of pixels
surrounding the pixel that the mouse is over:
local nRadius=10
Then I define a zoom factor, e.g.:
local nZoom=5
The width and height of the scanned square is then: nRadius*2+1 (+1
is the pixel that the mouse is over)
I get the width and height of the zoomed square as:
local nRect=(nRadius*2+1)*nZoom
where every original pixel is 5x5 pixel big.
Now the centered cursor is over the left top pixel of the enlarged
pixel. Why? I think the problem is that the reference point of the
scaling of the image is not its center but its left top. So I shift
the zoomed picture half the zoom-factor up and left (OK, in case of
a zoom factor of 5, I take 3), to get over the center of the zoomed
pixel. This is my offset:
local nOff=nZoom/2+1
which I also subtract from the width and height of the window to
avoid a margin. So basically I get:
hWnd.size(nRect-nOff,nRect-nOff)
for(!mouseleft)
hWnd.move(xmouse-nRadius*nZoom,ymouse-nRadius*nZoom)
dll.call("StretchBlt|ui i i i i ui i i i i ui",;;+
hDC_TT,nOff*-1,nOff*-1,nRect,nRect,;;+
hDC_SC,xmouse-nRadius,ymouse-nRadius,;;+
nRadius*2+1,nRadius*2+1,0xCC0020)
endfor
Maybe still not 100 percent, but looks pretty right to me.
Mockey
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