class TaskJuggler::Painter::FontMetricsData
The FontMetricsData
objects generate and store the font metrics data for a particular font. The glyph set is currently restricted to US ASCII characters.
Constants
- MAX_GLYPH_INDEX
- MIN_GLYPH_INDEX
Attributes
charWidth[R]
height[R]
kerningDelta[R]
ptSize[R]
Public Class Methods
new(fontName, type = :normal, ptSize = 24, height = nil, wData = nil, kData = nil)
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The constructor can be used in two different modes. If all font data is supplied, the object just stores the supplied font data. If only the font name is given, the class uses the prawn library to generate the font metrics for the requested font.
# File lib/taskjuggler/Painter/FontMetricsData.rb, line 32 def initialize(fontName, type = :normal, ptSize = 24, height = nil, wData = nil, kData = nil) @fontName = fontName @type = type @height = height @ptSize = ptSize @averageWidth = 0.0 if wData && kData @charWidth = wData @kerningDelta = kData else generateMetrics end end
Public Instance Methods
averageWidth()
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The average with of all glyphs.
# File lib/taskjuggler/Painter/FontMetricsData.rb, line 55 def averageWidth return (@averageWidth * (3.0 / 4.0)).to_i end
glyphWidth(c)
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Return the width of the glyph c. This must be a single character String
. If the glyph is not known, nil is returned.
# File lib/taskjuggler/Painter/FontMetricsData.rb, line 50 def glyphWidth(c) return @charWidth[c] end
to_ruby()
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Generate the FontMetricsData
initialization code for the particular font. The output will be Ruby syntax.
# File lib/taskjuggler/Painter/FontMetricsData.rb, line 61 def to_ruby indent = ' ' * 6 s = "#{indent}Font_#{@fontName.gsub(/-/, '_')}_#{@type} = " + "Painter::FontMetricsData.new('#{@fontName}', :#{@type}, " + "#{@ptSize}, #{"%.3f" % @height},\n" s << "#{indent} @charWidth = {" i = 0 @charWidth.each do |c, w| s << (i % 4 == 0 ? "\n#{indent} " : ' ') i += 1 s << "'#{escapedChars(c)}' => #{"%0.3f" % w}," end s << "\n#{indent} },\n" s << "#{indent} @kerningDelta = {" i = 0 @kerningDelta.each do |cp, w| s << (i % 4 == 0 ? "\n#{indent} " : ' ') i += 1 s << "'#{cp}' => #{"%.3f" % w}," end s << "\n#{indent} }\n#{indent})\n" end