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100 lines
4.0 KiB
Markdown
100 lines
4.0 KiB
Markdown
# Terrarum Sans Bitmap
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<< insert sample image here, when it's done >>
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This font is a bitmap font used in my game project, Terrarum (hence the name). It Supports ExtA, Romanian (subset of ExtB), Cyrillic, Greek, Chinese, Japanese and Korean.
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The code for the fonts are meant to be used with Slick2d (extends ```Font``` class). If you are not using the framework, please refer to next section to implement the font metrics correctly on your system.
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The issue page is open. If you have some issues to submit, or have a question, please leave it on the page.
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## Font metrics
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The font expects both variable widths and fixed width to be supported. Any images with ```_variable``` means it expects variable widths. Anything else expects fixed width. ```romana_narrow``` has width of 6 (no, not 5), ```romana_wide``` has width of 9, ```cjkpunct``` has width of 10, ```kana``` has width of 12, ```hangul_johab``` has width of 11, ```wenquanyi``` has width of 16.
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### Parsing glyph widths for variable font sheets
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Width is encoded in binary number, on pixels. If you open the image, every glyph has vertical dots on their right side (to be exact, every (16k - 1)th pixel on x axis). Topmost dot represents 1. For example, ASCII glyph 'C' has width of 9, 'W' has width of 11, " (double quote) has width of 6.
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### Implementing Korean writing system
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There are 10 sets of Hangul glyph pieces. Top 6 concerns initials, middle 2 concerns medials, and bottom 2 concerns finals. On the rightmost side, there's eight assembled glyphs to help you with (assuming you have basic knowledge on the writing system). Top 6 tells you how to use 6 initials, and bottom 2 tells you how to use 2 finals.
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This is a Kotlin-like pseudocode for assembling the glyph:
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jungseongWide = arrayOf(8, 12, 13, 17, 18, 21)
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jungseongComplex = arrayOf(9, 10, 11, 14, 15, 16, 22)
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function getHanInitialRow(hanIndex: Int): Int {
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val ret: Int
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if (isJungseongWide(hanIndex))
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ret = 2
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else if (isJungseongComplex(hanIndex))
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ret = 4
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else
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ret = 0
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return if (getHanJongseong(hanIndex) == 0) ret else ret + 1
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}
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function isJungseongWide(hanIndex: Int) = jungseongWide.contains(getHanJungseong(hanIndex))
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function isJungseongComplex(hanIndex: Int) = jungseongComplex.contains(getHanJungseong(hanIndex))
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function getHanInitialRow(hanIndex: Int): Int {
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val ret: Int
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if (isJungseongWide(hanIndex))
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ret = 2
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else if (isJungseongComplex(hanIndex))
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ret = 4
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else
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ret = 0
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return if (getHanJongseong(hanIndex) == 0) ret else ret + 1
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}
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function getHanMedialRow(hanIndex: Int) = if (getHanJongseong(hanIndex) == 0) 6 else 7
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function getHanFinalRow(hanIndex: Int): Int {
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val jungseongIndex = getHanJungseong(hanIndex)
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return if (jungseongWide.contains(jungseongIndex))
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8
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else
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9
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}
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function isHangul(c: Char) = c.toInt() >= 0xAC00 && c.toInt() < 0xD7A4
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...
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for (each Char on the string) {
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if (isHangul(Char)) {
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val hIndex = Char.toInt() - 0xAC00
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val indexCho = getHanChosung(hIndex)
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val indexJung = getHanJungseong(hIndex)
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val indexJong = getHanJongseong(hIndex)
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val choRow = getHanInitialRow(hIndex)
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val jungRow = getHanMedialRow(hIndex)
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val jongRow = getHanFinalRow(hIndex)
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// get sub image from sprite sheet
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val choseongImage = hangulSheet.getSubImage(indexCho, choRow)
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val jungseongImage = hangulSheet.getSubImage(indexJung, jungRow)
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val jongseongImage = hangulSheet.getSubImage(indexJong, jongRow)
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// actual drawing part
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draw choseongImage to somewhere you want
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draw jungseongImage on top of choseongImage
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draw jongseongImage on top of choseongImage
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}
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...
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}
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## Acknowledgement
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Thanks to kind people of [/r/Typography](https://www.reddit.com/r/typography/) for amazing feedbacks.
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