PDF dot rendering question

Hi, I am trying to render a grid made of dots in a JFreeChart inside of a JasperReport, which is exported to a PDF file. The PDF file prints just fine, but when I open it in the Acrobat Viewer, the following behavior occurs. At high zoom resolutions in the viewer (400% - 1600%), the dots that make up the grid look fine (i.e. they look like small squares), but at lower resolutions, 100% in particular, they become horizontally stretched, and look like very short horizontal lines, instead of dots. The only way I've been able to resolve that issue, is to give the dots (rendered by a BasicStroke awt object) very tiny dimensions, in which case, they look like dots at any resolution in the PDF Viewer, but because of the tiny size, are no longer picked up by the printer.
Has anyone come up against this issue? Is there a particular reason why dots (or little squares) would get stretched out in the Viewer at lower resolutions? Thanks in advance for any tips or suggestions.

This all goes to how the dot resolution is converted to the 96dpi characteristic of screens. It sounds like you are using a bitmap dot and not a vector character. If it was a vector character then it would more likely retain the shape. It may also depend on the display resolution you selected in the PDF creations.

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