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# Copyright (c) 2010-2024 openpyxl
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import math
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#constants
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DEFAULT_ROW_HEIGHT = 15. # Default row height measured in point size.
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BASE_COL_WIDTH = 8 # in characters
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DEFAULT_COLUMN_WIDTH = BASE_COL_WIDTH + 5
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# = baseColumnWidth + {margin padding (2 pixels on each side, totalling 4 pixels)} + {gridline (1pixel)}
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DEFAULT_LEFT_MARGIN = 0.7 # in inches, = right margin
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DEFAULT_TOP_MARGIN = 0.7874 # in inches = bottom margin
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DEFAULT_HEADER = 0.3 # in inches
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# Conversion functions
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"""
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From the ECMA Spec (4th Edition part 1)
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Page setup: "Left Page Margin in inches" p. 1647
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Docs from
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http://startbigthinksmall.wordpress.com/2010/01/04/points-inches-and-emus-measuring-units-in-office-open-xml/
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See also http://msdn.microsoft.com/en-us/library/dd560821(v=office.12).aspx
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dxa: The main unit in OOXML is a twentieth of a point. Also called twips.
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pt: point. In Excel there are 72 points to an inch
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hp: half-points are used to specify font sizes. A font-size of 12pt equals 24 half points
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pct: Half-points are used to specify font sizes. A font-size of 12pt equals 24 half points
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EMU: English Metric Unit, EMUs are used for coordinates in vector-based
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drawings and embedded pictures. One inch equates to 914400 EMUs and a
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centimeter is 360000. For bitmaps the default resolution is 96 dpi (known as
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PixelsPerInch in Excel). Spec p. 1122
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For radial geometry Excel uses integer units of 1/60000th of a degree.
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"""
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def inch_to_dxa(value):
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"""1 inch = 72 * 20 dxa"""
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return int(value * 20 * 72)
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def dxa_to_inch(value):
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return value / 72 / 20
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def dxa_to_cm(value):
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return 2.54 * dxa_to_inch(value)
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def cm_to_dxa(value):
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emu = cm_to_EMU(value)
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inch = EMU_to_inch(emu)
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return inch_to_dxa(inch)
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def pixels_to_EMU(value):
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"""1 pixel = 9525 EMUs"""
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return int(value * 9525)
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def EMU_to_pixels(value):
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return round(value / 9525)
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def cm_to_EMU(value):
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"""1 cm = 360000 EMUs"""
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return int(value * 360000)
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def EMU_to_cm(value):
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return round(value / 360000, 4)
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def inch_to_EMU(value):
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"""1 inch = 914400 EMUs"""
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return int(value * 914400)
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def EMU_to_inch(value):
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return round(value / 914400, 4)
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def pixels_to_points(value, dpi=96):
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"""96 dpi, 72i"""
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return value * 72 / dpi
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def points_to_pixels(value, dpi=96):
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return int(math.ceil(value * dpi / 72))
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def degrees_to_angle(value):
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"""1 degree = 60000 angles"""
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return int(round(value * 60000))
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def angle_to_degrees(value):
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return round(value / 60000, 2)
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def short_color(color):
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""" format a color to its short size """
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if len(color) > 6:
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return color[2:]
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return color
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