Git Product home page Git Product logo

Comments (10)

olikraus avatar olikraus commented on June 26, 2024

We can discuss here, how the width gets calculated, but in general the value has been defined by the font author.
In fact there might be a bug in the BDF sources.
You might also consider to use monospaced option while creating the binary code to get a more predictable width.
For further discussion mit would be good to see the overview picture, which is generated by bdfconv including the "-a" option.

from u8g2.

xray-bit avatar xray-bit commented on June 26, 2024

I am using CJK characters, and if I use the monospaced option, the width of ASCII characters will become the same as CJK characters (twice the original width)

from u8g2.

olikraus avatar olikraus commented on June 26, 2024

Still it would be great to have an example of a wrong calculated width.

from u8g2.

xray-bit avatar xray-bit commented on June 26, 2024

Font source

https://www.unifoundry.com/pub/unifont/unifont-15.1.05/font-builds/unifont-15.1.05.bdf.gz

Font conversion

test.map:

32-126

cmd:

bdfconv.exe -v -b 0 -f 1 -M .\test.map -n u8g2_font_unifont_16_test -o u8g2_font_unifont_16_test.c -d .\unifont-15.1.05.bdf .\unifont-15.1.05.bdf

result of the font:

/*
  Fontname: -gnu-Unifont-Medium-R-Normal-Sans-16-160-75-75-c-80-iso10646-1
  Copyright: Copyright (C) 1998-2024 Roman Czyborra, Paul Hardy, Qianqian Fang, Andrew Miller, Johnnie Weaver, David Corbett, Nils Moskopp, Rebecca Bettencourt, Ho-Seok Ee, et al. License: SIL Open Font License version 1.1 and GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html> with the GNU Font Embedding Exception.
  Glyphs: 95/57084
  BBX Build Mode: 0
*/
const uint8_t u8g2_font_unifont_16_test[1191] U8G2_FONT_SECTION("u8g2_font_unifont_16_test") = 
  "_\0\3\2\3\4\4\5\5\10\20\0\376\12\376\13\377\1\212\3\24\4\212 \5\0\364\30!\7Q\206"
  "\30\207D\42\10%\305\30\231[\0#\17\326\204X=\15C\22\265\14C\324\23\0$\21\327\204x\341"
  "\240D\221\24\316c$U\6\61\3%\24\327\204\70\232\224\224\222HI\343\64\221\222()i\12\0&"
  "\21\327\204X[)\253\204b\22i\211\230d\322\24'\7!\306\30C\0(\14\343}XI\224D\275"
  "EY\0)\14c}\30Y\224E\275DI\4*\15\277\214x\245J\333\226\64\325\62\0+\13\277\214"
  "xqm\30\262\270\6,\10\242u\30J\242\0-\7\14\245\30C\0.\7\222\205\30C\0/\13\326"
  "\204\270\305j\230\206\325\24\60\21\326\204XZ\224\204\332\224(\321&&Q&\1\61\13U\205X\231\224"
  "\204}\32\4\62\16\326\204\70C\22\212i\246\205\325t\30\63\20\326\204\70C\22\212i\64\247\242\230\14"
  "\11\0\64\20\326\204\230\241\226D\225,\311\222aL+\0\65\16\326\204\30\207\264:\310i*&C\2"
  "\66\16\326\204XS\230\246\203\22:&C\2\67\13\326\204\30\327bZL\233\0\70\17\326\204\70C\22"
  "\32\223!\11\35\223!\1\71\16\326\204\70C\22\32\223Am\214&\0:\10\272\215\30C<\4;\12"
  "\312}\30C\254$\12\0<\10M\205\230Y\327\16=\10\256\224\30w\342\60>\11\315\204\30i\267\216"
  "\0\77\16\326\204\70C\22\212iX\315\301\64\2@\22\326\204XS&%J\262DJ\244D\322\22\17"
  "\1A\15\326\204XZ\324\22\212\303 :\6B\16\326\204\30\203\22\32\207%t\34\26\0C\15\326\204"
  "\70C\22Z;\212\311\220\0D\15\326\204\30C\224%\241\337\222!\2E\14\326\204\30\207\264:(i"
  "\353\60F\14\326\204\30\207\264:(iW\0G\16\326\204\70C\22ZKChS\226\0H\13\326\204"
  "\30\241\343\60\210\36\3I\12U\205\30\203\24\366\323 J\15\327\204X\203\30\367\224EY\266\1K\21"
  "\326\204\30\241\226D\225L\24\223,\252%a\0L\11\326\204\30i\177\35\6M\14\326\204\30\241\70\15"
  "\321\342\321\61N\20\326\204\30\341\266)\221\22I\211\224h\307\0O\14\326\204\70C\22\372c\62$\0"
  "P\14\326\204\30\203\22\32\207%\355\12Q\26\337|\70C\24&a\22&a\22&a\222(\211$\15"
  "\71 R\20\326\204\30\203\22\32\207%\252%Y\22\212\1S\15\326\204\70C\22\232\35\305dH\0T"
  "\12\327\204\30\207,\356o\0U\12\326\204\30\241\177L\206\4V\21\327\204\30\251\65\311\242,\312*a"
  "\222\306\31\0W\14\326\204\30\241\27\227i\210F\61X\17\326\204\30\241\230Dm\242\26\265\204b\0Y"
  "\16\327\204\30\251\232dQVI\343n\0Z\12\326\204\30\327b\257\351\60[\11c~\30C\324\77\15"
  "\134\13\326\204\30i\134\215\323\270\32]\11\343|\30S\377\64\4^\11\236\314XZ\224\204\1_\7\217"
  "|\30\207\0`\7\33\325\30Y\1a\15\306\204\70C\22\246\311\60\332\224%b\15\336\204\30i\313\242"
  "\211\216\233\262\0c\14\306\204\70C\22\252\35\223!\1d\14\336\204\270-\213\66zS\226\0e\16\306"
  "\204\70C\22\212\303\240\26\223!\1f\14\335\204xRX\32\244\260'\0g\23\336t\270\311\242%Y"
  "\222E[:$\241\230\14\11\0h\13\336\204\30i\313\242\211>\6i\13]\205Xa\216\210}\32\4"
  "j\14\355t\230uD\354\243\24I\0k\20\336\204\30i[\22U\62\61\311\242Z\22\6l\11]\205"
  "\70b\377\64\10m\21\307\204\30\213\22ER$ER$ER$\25n\12\306\204\30\311\242\211>\6"
  "o\14\306\204\70C\22\372\230\14\11\0p\16\326t\30\311\242\211\216\233\262\244)\0q\14\326t\70\213"
  "\66zS\226\264\0r\13\306\204\30\311\242\211jW\0s\14\306\204\70C\22\312\216\311\220\0t\13\325"
  "\204Xai\220\302\256\2u\11\306\204\30\241\337\224%v\14\306\204\30\241\61\211z\23%\0w\21\307"
  "\204\30\251\24I\221\24I\221\24I\25\13\0x\16\306\204\30\241\230D\231\250EI(\6y\15\326t"
  "\30\241\307$\262\244\225!\1z\11\306\204\30\327\260\327a{\16luXJ\26fQ\261\26e\241\0"
  "|\7qv\30\37\4}\16lu\30b\26ea\251\26f\211\4~\12\237\304\70\232\24i\12\0\0"
  "\0\0\4\377\377\0";

Reproduction code

int reproduct(u8g2_t *u8g2)
{
    u8g2_Setup_sh1107_seeed_128x128_f(u8g2, U8G2_R3, u8x8_msg_callback, u8x8_msg_callback);

    u8g2_InitDisplay(u8g2);
    u8g2_SetPowerSave(u8g2, 0);
    u8g2_ClearDisplay(u8g2);

    u8g2_SetContrast(u8g2, 128);

    u8g2_SetFont(u8g2, u8g2_font_unifont_16_test);
    u8g2_SetFontPosBaseline(u8g2);

    printf("width=%d of ' '\n", u8g2_GetStrWidth(u8g2, " "));
    printf("width=%d of '1'\n", u8g2_GetStrWidth(u8g2, "1"));
    printf("width=%d of '12'\n", u8g2_GetStrWidth(u8g2, "12"));
    printf("width=%d of '22'\n", u8g2_GetStrWidth(u8g2, "22"));
    printf("width=%d of ' 1'\n", u8g2_GetStrWidth(u8g2, " 1"));
    printf("width=%d of ' 12'\n", u8g2_GetStrWidth(u8g2, " 12"));
    printf("width=%d of ' 22'\n", u8g2_GetStrWidth(u8g2, " 22"));

    return 0;
}

output:

width=8 of ' '
width=9 of '1'
width=17 of '12'
width=16 of '22'
width=15 of ' 1'
width=23 of ' 12'
width=23 of ' 22'

from u8g2.

olikraus avatar olikraus commented on June 26, 2024

still the output looks ok to me. what exactly is your cooncern?

from u8g2.

xray-bit avatar xray-bit commented on June 26, 2024

I counted the pixels on the screen, and the actual width of each ASCII character is 8. However, after combining different characters into a string, the width obtained using u8g2_GetStrWidth may not be a multiple of 8.

In some scenarios, I need to calculate the length of the string to determine where to start drawing characters. I expect the width of each ASCII character to be 8, but based on the above results, the calculated length of the string "12" is 17. If drawn right aligned (screen width minus string width), it will devour the pixels of the previous column.

Where could the problem be? Is this an issue with the BDF file, 'bdfconv' tool, or u8g2_GetStrWidth?

from u8g2.

olikraus avatar olikraus commented on June 26, 2024

In such a case you need to use "-b 2" or "-b 3" with "bdfconv" to force a monospaced font.

from u8g2.

xray-bit avatar xray-bit commented on June 26, 2024

I am using CJK characters, and if I use the monospaced option, the width of ASCII characters will become the same as CJK characters (twice the original width)

Can I first convert ASCII characters using the monospace option with a width of 8, then convert CJK characters using the monospace option with a width of 16, and finally merge the two arrays?

If possible, how should I merge these two arrays?

I checked this document: https://github.com/olikraus/u8g2/wiki/u8g2fontformat and modified the Font Header offset 0 and offset 21+22, but it was not successful.

from u8g2.

Related Issues (20)

Recommend Projects

  • React photo React

    A declarative, efficient, and flexible JavaScript library for building user interfaces.

  • Vue.js photo Vue.js

    🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.

  • Typescript photo Typescript

    TypeScript is a superset of JavaScript that compiles to clean JavaScript output.

  • TensorFlow photo TensorFlow

    An Open Source Machine Learning Framework for Everyone

  • Django photo Django

    The Web framework for perfectionists with deadlines.

  • D3 photo D3

    Bring data to life with SVG, Canvas and HTML. 📊📈🎉

Recommend Topics

  • javascript

    JavaScript (JS) is a lightweight interpreted programming language with first-class functions.

  • web

    Some thing interesting about web. New door for the world.

  • server

    A server is a program made to process requests and deliver data to clients.

  • Machine learning

    Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.

  • Game

    Some thing interesting about game, make everyone happy.

Recommend Org

  • Facebook photo Facebook

    We are working to build community through open source technology. NB: members must have two-factor auth.

  • Microsoft photo Microsoft

    Open source projects and samples from Microsoft.

  • Google photo Google

    Google ❤️ Open Source for everyone.

  • D3 photo D3

    Data-Driven Documents codes.