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copied!<pre><code>g = Graphics[{Rectangle[{0, 0}, {19, 28}], Orange, Rectangle[{0, 0}, {1, 1}]}] </code></pre> <p>Okay, first thing you need to do is set the <code>x</code> and <code>y</code> directions to use the same units, which means</p> <pre><code>Show[g, AspectRatio -> Automatic] </code></pre> <p>But this is already the default.</p> <p>Second thing you need to do is choose a size and range for your plot area. Let's make it 21 by 30 with your rectangles centred:</p> <pre><code>plotArea = {{0, 21}, {0, 30}} - {1, 1} Show[g, AspectRatio -> Automatic, PlotRange -> plotArea] </code></pre> <p>Third thing you need to do is turning off adding any padding/margins that make the actual size of your figure larger than your plot range:</p> <pre><code>final = Show[g, AspectRatio -> Automatic, PlotRange -> plotArea, PlotRangePadding -> 0, ImagePadding -> 0] </code></pre> <p>I believe <code>ImageMargins</code> does not make a difference, but if it does, set that to 0 as well.</p> <p>The final thing you need to do is export this to a printable format that preserves the image dimensions, and set the size of the image so that 1 cm will be 1 unit on your plot. Mathematica accepts image sizes in printer's points, so let's define:</p> <pre><code>cm = 72/2.54 Export["final.pdf", Show[final, ImageSize -> 21 cm]] </code></pre> <p>We want the plot to be 21 cm wide because it's 21 units wide. Use PDF as export format, not TIFF. The <code>ImageSize</code> needs to be used inside <code>Show</code> to work around some problems with <code>Export</code> ...</p> <p>Now open your PDF in Adobe Reader, open the print dialogue, and make sure that Page Scaling is set to None! I don't know how to do this in other readers ... Also make sure your figure fits the paper (21 by 30 cm is too large for A4 ...)</p> <p>I'm not going to do a test print, so let me know if this works for you :-) The size of the PDF generated this way is exactly 21 by 30 cm, so if something goes wrong, it must happen at the printing stage.</p>

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