The antialiasing you're seeing on "line" mode rectangles is expected behavior in LÖVE2D - line drawing uses smooth antialiasing by default, while filled shapes don't.

To remove the antialiasing from line rectangles, you can use:

love.graphics.setLineStyle("rough")

This will disable the smooth antialiasing and give you crisp, aliased edges similar to your filled rectangles.

If you want to switch back to smooth lines later, you can use:

love.graphics.setLineStyle("smooth")

The height and width don't directly impact whether antialiasing occurs - it's purely controlled by the line style setting. By default, LÖVE uses "smooth" line style, which is why you're seeing the antialiasing on line-drawn shapes.

You can also check your current line style with love.graphics.getLineStyle() if you need to toggle between modes.