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124 lines
3.1 KiB
CoffeeScript
124 lines
3.1 KiB
CoffeeScript
###
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PDFPage - represents a single page in the PDF document
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By Devon Govett
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###
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class PDFPage
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constructor: (@document, options = {}) ->
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@size = options.size or 'letter'
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@layout = options.layout or 'portrait'
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# process margins
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if typeof options.margin is 'number'
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@margins =
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top: options.margin
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left: options.margin
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bottom: options.margin
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right: options.margin
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# default to 1 inch margins
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else
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@margins = options.margins or DEFAULT_MARGINS
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# calculate page dimensions
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dimensions = if Array.isArray(@size) then @size else SIZES[@size.toUpperCase()]
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@width = dimensions[if @layout is 'portrait' then 0 else 1]
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@height = dimensions[if @layout is 'portrait' then 1 else 0]
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@content = @document.ref()
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# Initialize the Font, XObject, and ExtGState dictionaries
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@resources = @document.ref
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ProcSet: ['PDF', 'Text', 'ImageB', 'ImageC', 'ImageI']
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# Lazily create these dictionaries
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Object.defineProperties this,
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fonts:
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get: => @resources.data.Font ?= {}
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xobjects:
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get: => @resources.data.XObject ?= {}
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ext_gstates:
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get: => @resources.data.ExtGState ?= {}
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patterns:
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get: => @resources.data.Pattern ?= {}
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annotations:
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get: => @dictionary.data.Annots ?= []
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# The page dictionary
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@dictionary = @document.ref
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Type: 'Page'
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Parent: @document._root.data.Pages
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MediaBox: [0, 0, @width, @height]
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Contents: @content
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Resources: @resources
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maxY: ->
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@height - @margins.bottom
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write: (chunk) ->
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@content.write chunk
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end: ->
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@dictionary.end()
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@resources.end()
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@content.end()
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DEFAULT_MARGINS =
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top: 72
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left: 72
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bottom: 72
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right: 72
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SIZES =
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'4A0': [4767.87, 6740.79]
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'2A0': [3370.39, 4767.87]
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A0: [2383.94, 3370.39]
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A1: [1683.78, 2383.94]
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A2: [1190.55, 1683.78]
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A3: [841.89, 1190.55]
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A4: [595.28, 841.89]
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A5: [419.53, 595.28]
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A6: [297.64, 419.53]
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A7: [209.76, 297.64]
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A8: [147.40, 209.76]
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A9: [104.88, 147.40]
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A10: [73.70, 104.88]
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B0: [2834.65, 4008.19]
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B1: [2004.09, 2834.65]
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B2: [1417.32, 2004.09]
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B3: [1000.63, 1417.32]
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B4: [708.66, 1000.63]
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B5: [498.90, 708.66]
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B6: [354.33, 498.90]
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B7: [249.45, 354.33]
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B8: [175.75, 249.45]
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B9: [124.72, 175.75]
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B10: [87.87, 124.72]
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C0: [2599.37, 3676.54]
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C1: [1836.85, 2599.37]
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C2: [1298.27, 1836.85]
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C3: [918.43, 1298.27]
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C4: [649.13, 918.43]
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C5: [459.21, 649.13]
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C6: [323.15, 459.21]
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C7: [229.61, 323.15]
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C8: [161.57, 229.61]
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C9: [113.39, 161.57]
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C10: [79.37, 113.39]
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RA0: [2437.80, 3458.27]
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RA1: [1729.13, 2437.80]
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RA2: [1218.90, 1729.13]
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RA3: [864.57, 1218.90]
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RA4: [609.45, 864.57]
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SRA0: [2551.18, 3628.35]
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SRA1: [1814.17, 2551.18]
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SRA2: [1275.59, 1814.17]
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SRA3: [907.09, 1275.59]
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SRA4: [637.80, 907.09]
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EXECUTIVE: [521.86, 756.00]
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FOLIO: [612.00, 936.00]
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LEGAL: [612.00, 1008.00]
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LETTER: [612.00, 792.00]
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TABLOID: [792.00, 1224.00]
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module.exports = PDFPage |