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| """Helper to get paper sizes.""" | |
| from collections import namedtuple | |
| Dimensions = namedtuple("Dimensions", ["width", "height"]) | |
| class PaperSize: | |
| """(width, height) of the paper in portrait mode in pixels at 72 ppi.""" | |
| # Notes how to calculate it: | |
| # 1. Get the size of the paper in mm | |
| # 2. Convert it to inches (25.4 millimeters are equal to 1 inches) | |
| # 3. Convert it to pixels ad 72dpi (1 inch is equal to 72 pixels) | |
| # All Din-A paper sizes follow this pattern: | |
| # 2xA(n-1) = A(n) | |
| # So the height of the next bigger one is the width of the smaller one | |
| # The ratio is always approximately the ratio 1:2**0.5 | |
| # Additionally, A0 is defined to have an area of 1 m**2 | |
| # Be aware of rounding issues! | |
| A0 = Dimensions(2384, 3370) # 841mm x 1189mm | |
| A1 = Dimensions(1684, 2384) | |
| A2 = Dimensions(1191, 1684) | |
| A3 = Dimensions(842, 1191) | |
| A4 = Dimensions( | |
| 595, 842 | |
| ) # Printer paper, documents - this is by far the most common | |
| A5 = Dimensions(420, 595) # Paperback books | |
| A6 = Dimensions(298, 420) # Post cards | |
| A7 = Dimensions(210, 298) | |
| A8 = Dimensions(147, 210) | |
| # Envelopes | |
| C4 = Dimensions(649, 918) | |
| _din_a = ( | |
| PaperSize.A0, | |
| PaperSize.A1, | |
| PaperSize.A2, | |
| PaperSize.A3, | |
| PaperSize.A4, | |
| PaperSize.A5, | |
| PaperSize.A6, | |
| PaperSize.A7, | |
| PaperSize.A8, | |
| ) | |