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Rework the text module.
This commit is contained in:
Devon Govett
parent
fd1ebd1589
commit
6f62c5d3cf
@ -8,6 +8,16 @@ module.exports =
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@y = 0
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@_lineGap = 0
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# Keeps track of what has been set in the document
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@_textState =
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font: null
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fontSize: null
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mode: 0
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wordSpacing: 0
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# state of the wrapping algorithm
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@_wrapState = {}
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lineGap: (@_lineGap) ->
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return this
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@ -16,96 +26,45 @@ module.exports =
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options = x
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x = null
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# Update the current position
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@x = x or options.x or @x
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@y = y or options.y or @y
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{x, y} = this
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# More options: characterSpacing, wordSpacing, etc.
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lineGap = options.lineGap ? @_lineGap
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align = options.align or 'left'
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text = '' + text
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# add current font to page if necessary
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@page.fonts[@_font.id] ?= @_font.ref
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# word wrapping
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if options.width
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return @_wrap text, options
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@_wrap text, options
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# newlines
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else if (matches = text.split '\n').length > 1
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@_line match, options for match in matches
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# single line
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else
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@_line text, options
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# support newlines in text
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if (matches = text.split '\n').length > 1
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@text match, { align } for match in matches
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return this
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# text alignment support
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if options.lineWidth
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switch align
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when 'right'
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x += (options.lineWidth or 0) - @widthOfString text
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when 'center'
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x += options.lineWidth / 2 - @widthOfString(text) / 2
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when 'justify'
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break if options.lastLine
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words = text.match(WORD_RE)
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break unless words
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textWidth = @widthOfString text.replace(/\s+/g, '')
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lineWidth = options.lineWidth
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lineWidth -= options.indent or 0 if options.firstLine
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wordSpacing = (lineWidth - textWidth) / (words.length - 1)
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# configure options for fragments
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fragmentOptions = {}
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for key, val of options when key not in ['align', 'lineWidth', 'lastLine']
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fragmentOptions[key] = val
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# render each word individually for now; might want to set temporary word spacing...
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originalX = x
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for word in words
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word = word.trim()
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@text word, x, y, fragmentOptions
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x += @widthOfString(word) + wordSpacing
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@x = originalX
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return this
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# indentation support
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if options.firstLine
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x += options.indent if options.indent
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@y = y += options.paragraphGap if options.paragraphGap and not options.firstParagraph
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y = @page.height - y - (@_font.ascender / 1000 * @_fontSize)
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text = @_escape text
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# begin the text object
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@addContent "BT"
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# text position
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@addContent "#{x} #{y} Td"
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# font and font size
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@addContent "/#{@_font.id} #{@_fontSize} Tf"
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# rendering mode
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mode = if options.fill and options.stroke then 2 else if options.stroke then 1 else 0
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@addContent "#{mode} Tr" unless mode is 0
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# add the actual text
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@addContent "(#{text}) Tj"
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# reset rendering mode so that it doesn't affect the next text object
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@addContent '0 Tr' unless mode is 0
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# end the text object
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@addContent "ET"
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@y += @currentLineHeight(true) + lineGap
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return this
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moveDown: (lines = 1) ->
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@y += @currentLineHeight(true) * lines + @_lineGap
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return this
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moveUp: (lines = 1) ->
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@y -= @currentLineHeight(true) * lines + @_lineGap
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return this
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list: (array, @x, @y) ->
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gap = Math.round (@_font.ascender / 1000 * @_fontSize) / 2
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for item in array
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@circle x + 3, @y + gap + 3, 3
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@text item, x + 15
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@y += 3
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@fill()
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_escape: (text) ->
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('' + text)
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.replace(/\\/g, '\\\\\\\\')
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@ -114,69 +73,145 @@ module.exports =
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.replace(/</g, '<')
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.replace(/>/g, '>')
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.replace(/&/g, '&')
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_line: (text, options) ->
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wrap = @_wrapState
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paragraphGap = (wrap.firstLine and not wrap.firstParagraph and options.paragraphGap) or 0
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lineGap = options.lineGap or @_lineGap or 0
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@_fragment text, @x, @y + paragraphGap, options
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@y += @currentLineHeight(true) + lineGap + paragraphGap
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_fragment: (text, x, y, options = {}) ->
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state = @_textState
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wrap = @_wrapState
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align = options.align or 'left'
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text = '' + text
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indent = (wrap.firstLine and options.indent) or 0
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wordSpacing = 0
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# text alignments
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if options.width
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lineWidth = options.width - indent
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switch align
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when 'right'
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x += lineWidth - @widthOfString(text)
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when 'center'
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x += lineWidth / 2 - @widthOfString(text) / 2
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when 'justify'
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# don't justify the last line of paragraphs
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break if wrap.lastLine
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# split the line into words
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words = text.match(WORD_RE)
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break unless words
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# calculate the word spacing value
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textWidth = @widthOfString text.replace(/\s+/g, '')
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wordSpacing = (lineWidth - textWidth) / (words.length - 1) - @widthOfString(' ')
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# Remove double spaces
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text = text.replace(/\s+/g, ' ')
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# indentation support
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x += indent
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# flip coordinate system
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y = @page.height - y - (@_font.ascender / 1000 * @_fontSize)
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# escape the text for inclusion in PDF
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text = @_escape text
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# begin the text object
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@addContent "BT"
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# text position
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@addContent "#{x} #{y} Td"
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# font and font size
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@addContent "/#{@_font.id} #{@_fontSize} Tf"# unless @_font is state.font and @_fontSize is state.fontSize
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# rendering mode
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mode = if options.fill and options.stroke then 2 else if options.stroke then 1 else 0
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@addContent "#{mode} Tr" unless mode is state.mode
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# Word spacing
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@addContent wordSpacing + ' Tw' unless wordSpacing is state.wordSpacing
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# add the actual text
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@addContent "(#{text}) Tj"
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# end the text object
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@addContent "ET"
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# keep track of text states
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state.font = @_font
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state.fontSize = @_fontSize
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state.mode = mode
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state.wordSpacing = wordSpacing
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_wrap: (text, options) ->
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{_font: font, _fontSize: size} = this
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{width:lineWidth, height:maxHeight, align} = options
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wrap = @_wrapState
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lineWidth = options.width
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maxY = @y + options.height
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width = @widthOfString.bind this
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maxY = @y + maxHeight
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indent = options.indent or 0
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options.lineWidth = lineWidth
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options.firstLine = true
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options.firstParagraph = true
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delete options.width
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delete options.height
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# initial settings
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wrap.firstLine = true
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wrap.firstParagraph = true
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spaceLeft = lineWidth - (options.indent or 0)
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# split the line into words
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words = text.match(WORD_RE)
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lineHeight = @currentLineHeight(true)
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# space left on the line to fill with words
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spaceLeft = lineWidth - (options.indent or 0)
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# word width cache
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wordWidths = {}
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len = words.length
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buffer = ''
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for word, i in words
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w = wordWidths[word] ?= width(word)
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if w > spaceLeft or word is '\n'
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if options.lastLine
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options.firstParagraph = false
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options.firstLine = true
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options.lastLine = false
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# keep track of the wrapping state
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if wrap.lastLine
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wrap.firstParagraph = false
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wrap.firstLine = true
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wrap.lastLine = false
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# if we've got a newline, mark it
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if word is '\n'
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options.lastLine = true
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wrap.lastLine = true
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w += indent
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# render the line
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lastLine = buffer.trim()
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@text lastLine, options
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@_line lastLine, options
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options.firstLine = false
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# we're no longer on the first line...
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wrap.firstLine = false
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# if we've reached the maximum height provided, don't render any more
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return if @y > maxY
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# reset the space left and buffer
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spaceLeft = lineWidth - w
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buffer = if word is '\n' then '' else word
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else
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# add the word to the buffer
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spaceLeft -= w
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buffer += word
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# add the last line
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options.lastLine = true
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@text buffer.trim(), options
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wrap.lastLine = true
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@_line buffer.trim(), options
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moveDown: (lines = 1) ->
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@y += @currentLineHeight(true) * lines + @_lineGap
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return this
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moveUp: (lines = 1) ->
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@y -= @currentLineHeight(true) * lines + @_lineGap
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return this
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list: (array, @x, @y) ->
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gap = Math.round (@_font.ascender / 1000 * @_fontSize) / 2
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for item in array
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@circle x + 3, @y + gap + 3, 3
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@text item, x + 15
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@y += 3
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@fill()
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# reset wrap state
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@_wrapState = {}
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