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annotate mupdf-source/docs/reference/common/coordinate-system.rst @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1 Coordinate Systems
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2 =================================
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4 In PDF, the origin (0, 0) of a page is located at its bottom-left corner. In
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5 MuPDF, the origin of a page is located at its top-left corner.
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7 .. image:: /images/img-coordinate-space.webp
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8 :width: 75%
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10 The exact coordinate of the page's corner may not always be (0, 0) but is
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11 defined by its CropBox in relation to the MediaBox.
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13 The rotation of the page also affects the PDF to MuPDF coordinate space
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14 relationship; the rotation automatically adjusted for and hidden in the MuPDF
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15 space.
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17 Coordinates are real numbers and measured in points (1/72 of an inch).
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19 The PDF page may override this convention by setting a UserUnit (must be larger than 1/72").
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21 Example
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22 -------
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24 In MuPDF interfaces we use the MuPDF coordinate space.
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26 .. code-block:: javascript
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28 var rectangle = [0,0,200,200]
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30 Results in:
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32 .. image:: /images/200x200-rect.webp
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33 :width: 200px
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35 Working at the PDF object level
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36 -------------------------------
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38 Sometimes you may want to work directly with the PDF objects without using the MuPDF high level functions.
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39 When doing this, you need to write the PDF coordinates as the PDF file expects them.
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41 .. code-block:: javascript
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43 var contents = document.addStream(`
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44 q % Save graphics state
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45 200 0 0 200 10 10 cm % Scale and translate to position image
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46 /Image1 Do % Fill image
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47 Q % Restore graphics state
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48 `)
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50 Then in this case we are working in the PDF coordinate space!
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52 Use the `PDFPage.prototype.getTransform` to get a matrix that can be used to transform between the coordinate spaces.