Here's the deal. If your vertex is exactly on 30, 30 and the second is at 30, 100 and you stroke is 1 pixel wide and black then the stroke will be sub pixel interpreted and displayed as a gray line 2 pixels wide covering the area of 29 - 30, 29 - 30 and 29 - 30, 100 - 101. To get the vertex position and the generated stroke to exactly line up the coordinates of the vertex will need to be 30.5, 30.5 and 30.5, 99.5. You can do this by observing the info panel while dragging things around while the comp window is zoomed in to 800 or 1600%. If you are filling a rectangle then whole pixel values are going to work for the vertex placement. AE can snap to grid and snap to guides. You can set the grid up in the preferences. You could set grid spacing to 2 pixels with 3 sub devisions to give you the half pixel guide you need for stroked lines or 1 even 1 pixel and 2 sub divisions if you would like, then alt/option click and drag to your hearts content. I didn't mean to imply that there were not times when sub pixel accuracy was important. Quite the opposite. Rolling titles with thin fonts is entirely possible in video if you set things up correctly but your design must comply with rules of motion. Had you stated in the first question that you were trying to create a ui for a mobile device (sorry I don't keep track of all the threads and can't remember that you asked abut UI design in other threads) your question could have been better answered the first time by referring to the grid setup I just told you about. I've done at least a dozen UI designs in AE for mobile devices and have never had a problem using layout grids. Most of my work for UI's has started in Photoshop. You can, by the way, copy a path in Photoshop and paste it to a shape layer path in AE... Good luck with your design. A rectangle shape layer drawn using a grid of 1 pixels with 2 sub divisions in AE by holding down the alt/option key while draggingthen edited on the left side: A rectangle with a 1 pixel stroke drawn using the grid set to 1 pixel and 2 subdivisions by starting and ending in the sub division:
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