furnace/papers/icons.md

To generate a new letter icon:

• Open res/icons.sfd in FontForge.
• Open "IBM Plex Sans Medium" to the side. Return to the icons font.
• Copy the (blank-looking) glyph at E0F0 to the new codepoint. It contains two baselines.
• Open the new codepoint.
• Select the upper baseline.
• Use Element | Insert Text Outlines... to place text:
  • Turn off "Scale so text width matches path length".
  • Align "centered".
  • Type first line of text into the box.
  • Click the "Insert" button (might need window resize to be visible).
• Delete the upper baseline.
• If there's a second line of letters, repeat for the lower baseline.
• Delete the lower baseline.
• Select all.
• Use Element | Transformations | Transform... to scale and place the text:
  • For "Origin", select "Glyph Origin".
  • In the drop-down beneath that, select "Scale Uniformly", and beneath that, "Move". Fill in values as below:
    • One letter: 12000%, X 896, Y 15.5.
    • Two letters: 10000%, X 896, Y 99.2.
    • Three letters: 8000%, X 896, Y 183.
    • Two lines: 8000%, X 896, Y 618.5.
  • If resulting glyph is too wide, repeat all steps starting with "IBM Plex Sans Condensed Medium" instead.
    • Remember to close the other IBM Plex font or select the proper one in the "Insert Text Outlines..." dialog.
  • Hit OK. The letter icon should be properly sized and centered.
• Save.
• Use File | Generate Fonts... to export res/icons.ttf.
  • "Validate before saving" should be turned off.
  • An error will pop up informing that the TrueType em-size isn't a power of two. Ignore this.
• Run res/make-iconfont.sh.

Notes:

• Codepoints E0F0 to E0F4 are for reference only.
• The back layer of each of E0F1 to E0F4 has lines that show the expected tops and bottoms of text. Round letters and numerals will reach slightly above or below.
• The WSG icon (E11F) has been slightly kerned to fit.