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readme - elaboration on font metrics

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minjaesong
2017-05-27 22:55:12 +09:00
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README.md
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@@ -60,11 +60,13 @@ On your code (Java):
## Font metrics
Although the font is basically a Spritesheet, some of the sheet expects variable widths to be supported. Any sheets with ```_variable``` means it expects variable widths. Anything else expects fixed width (regular Spritesheet behaviour). ```cjkpunct``` has width of 10, ```kana``` has width of 12, ```hangul_johab``` has width of 11, ```wenquanyi``` has width of 16.
Although the font is basically a Spritesheet, some of the sheet expects variable widths to be supported. Any sheets with ```_variable``` means it expects variable widths. Anything else expects fixed width (regular Spritesheet behaviour). ```cjkpunct``` has width of 10, ```kana``` and ```hangul_johab``` has width of 12, ```wenquanyi``` has width of 16.
### Parsing glyph widths for variable font sheets
Width is encoded in binary number, on pixels. On the font spritesheet, every glyph has vertical dots on their right side (to be exact, every (16k - 1)th pixel on x axis). From top to bottom, each dot represents 1, 2, 4 and 8. For example, ASCII glyph 'C' has width of 9, 'W' has width of 11, " (double quote) has width of 6.
![Sample of Font Spritesheet with annotation](https://github.com/minjaesong/Terrarum-sans-bitmap/blob/master/width_bit_encoding_annotated.png)
Width is encoded in binary bits, on pixels. On the font spritesheet, every glyph has vertical dots on their top-right side (to be exact, every (16k - 1)th pixel on x axis). Above image is a sample of the font, with width information coloured in magenta. From top to bottom, each dot represents 1, 2, 4 and 8. For example, in the above image, ! (exclamation mark) has width of 5, " (double quote) has width of 6, # (octothorp) has width of 8, $ (dollar sign) has width of 9.
### Implementing the Korean writing system