920dd0bef9
Summary: \nleq and \ngeq are AMS characters, so add support for parsing and showing those. Also, add font metrics from the ams_regular font. Test Plan: View `\ngeq \geq`, make sure that they look the same but with a slash through `\ngeq`. View `a \ngeq b`, make sure there's the right spacing for a rel. Reviewers: alpert Reviewed By: alpert Differential Revision: http://phabricator.khanacademy.org/D3547
47 lines
1009 B
Ruby
47 lines
1009 B
Ruby
require 'json'
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require 'rubygems'
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require 'ttfunk'
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def metrics_for_file(filename)
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file = TTFunk::File.open(filename)
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per_em = 1.0 * file.header.units_per_em
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chars = {}
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file.cmap.unicode[0].code_map.sort.each do |u, g|
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horiz = file.horizontal_metrics.for(g)
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# width = (horiz.advance_width / per_em).round(3)
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height = 0
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depth = 0
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italic = 0
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glyph = file.glyph_outlines.for(g)
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if glyph
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height = (glyph.y_max / per_em).round(3)
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depth = (-glyph.y_min / per_em).round(3)
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italic = [0, (glyph.x_max - horiz.advance_width) / per_em].max.round(3)
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end
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chars[u] = {
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# :width => width,
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:height => height,
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:depth => depth,
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:italic => italic,
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}
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end
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chars
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end
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font_dir = File.join(File.dirname(__FILE__), 'static/fonts/')
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metrics = {}
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%w[main-regular math-italic ams-regular].each do |face|
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metrics[face] = metrics_for_file(File.join(font_dir, 'katex_%s.ttf' % face))
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end
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puts "var metricMap = %s;" % metrics.to_json
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