HexaPDF is now able to use a TrueType font to generate content. There are still some limitations, like the missing support for subsets but most things work quite well already. Complete integration into the Canvas and font selection API is also not done yet.
The attached script generates a PDF showcasing all available glyphs defined in a font as well as a sample text containing characters from the Unicode BMP as well as from other Unicode planes.
| require 'hexapdf/document' | |
| require 'hexapdf/font/ttf_wrapper' | |
| doc = HexaPDF::Document.new | |
| doc.config['font.on_missing_glyph'] = ->(n,f) { f.missing_glyph_id } | |
| fontio = File.open('/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf', 'r') | |
| ttf_font = HexaPDF::Font::TTF::Font.new(io: fontio) | |
| wrapper = HexaPDF::Font::TTFWrapper.new(doc, ttf_font) | |
| max_gid = ttf_font[:maxp].num_glyphs | |
| canvas = doc.pages.add_page.canvas | |
| canvas.instance_eval { @font = wrapper } | |
| canvas.font_size = 12 | |
| canvas.text("qwertyuiop[]asdfghjkl;'\zxcvbnm,./1234567890-\n~!@# $%^&*()_+}{|\":?><|\n¶öóáßðfïghäåéëöóþü朩µbñ¹²³¤‘\n" \ | |
| "🐭 🐮 🐱 🐵 😀", at: [100, 100]) | |
| 255.times do |page| | |
| break unless page*256 < ttf_font[:maxp].num_glyphs | |
| canvas = doc.pages.add_page.canvas | |
| canvas.instance_eval { @font = wrapper } | |
| canvas.font_size = 15 | |
| 16.times do |y| | |
| canvas.move_text_cursor(offset: [10, 800 - y*50], absolute: true) | |
| canvas.show_glyphs((0..15).map do |i| | |
| gid = page*256 + y*16 + i | |
| glyph = wrapper.glyph(gid) || wrapper.glyph(0) | |
| gid > max_gid ? [] : [glyph, -(2000 - glyph.width)] | |
| end.flatten!) | |
| end | |
| end | |
| doc.write("ttf.pdf") |