Getting Pixel Position in an image
Getting Pixel Position in an image
- Subject: Getting Pixel Position in an image
- From: "Anish Kumar" <email@hidden>
- Date: 21 Dec 2004 07:26:15 -0000
Hi All,
Can anyone please tell me how to get the "Pixel position" of a pixel that is currently under
the mouse for an image that is displayed in a sub-class of NSView. I know how to get the
current mouse location in the image views co-ordinates, but I can't use this value in my
application for the following reason.
Basically I am developing an annotation feature for my application (Similar to ACROBAT's
annotation feature) and the user can enter their comments/annotation for the image and a
icon will be placed on the location where the annotation was made to the image. Clicking
the icon will display the annotation that was made there.
The problem I face here is:- as long as the image is not zoomed, the annotation icons are in
their correct position. When I zoom the image, the icons are misplaced as I am using the
mouse locations for placing the icons to the image. Now if I use the PIXEL POSITION in the
image instead of the mouse location I can place the annotation icons at the correct pixel
position irrespective of the zoom-level of the image.
So can anyone please tell me how to get the pixel-positions in an image.( something similar
to Adobe photoshop's INFO window, where they display the X-Y coordinates of the cursor,
that doesn't change for a particular position in the image even if the image is zoomed
(zoom-in or zoom-out) to any level.
thanks in advance,
-Anish
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