端端舝

Pycairo 毛妏勻化心月(1)
(衄)扑件申奈 2022.3.1
https://github.com/Eridanus-Hawaii/Drawing-with-Python

乒民矛奈扑亦件ㄩ�賒卞Text 賒砉毛⻌木凶中
仇丹中丹及毛
釬曰凶中
? 郔場反 Fireworks
午中丹失皿伉匹
釬勻凶互﹜﹜﹜
? 恅晟毛螿楛卞劐
尹公丹分﹜﹜﹜
匹丐木壬
? 皿伕弘仿立件弘

Pycairo 午反卅氏冗支ˋ
? Pycairo is a Python module providing bindings for the cairo
graphics library. It depends on cairo >= 1.15.10 and works
with Python 3.7+. Pycairo, including this documentation, is
licensed under the LGPL-2.1-only OR MPL-1.1.
丐‵公丹井公丹井 Pycairo 及ゴ卞 Cario 互丐月及井﹜﹜﹜
https://pycairo.readthedocs.io/en/latest/

Cairo 午反卅氏冗支ˋ
? Cairo is a 2D graphics library with support for multiple output
devices. Currently supported output targets include the X
Window System (via both Xlib and XCB), Quartz, Win32,
image buffers, PostScript, PDF, and SVG file output.
Experimental backends include OpenGL, BeOS, OS/2, and
DirectFB.
? 引丑ⅸ凶仁晟丹午 2D 及弘仿白奴永弁?仿奶皮仿伉分﹝
云罷鏡五互堤懂月﹝
https://cairographics.org/

Pycairo 仇午反元戶
? install
? pip3 install pycairo
? C 及仿奶皮仿伉毛斛猁午允月井日 wheel 午井互公及ゴ卞斛猁井手﹝
? pip3 install wheel
? 妏丹媆
? import cairo

Pycairo 今勻公仁妏勻化心月
import cairo
#----------------------------------------------------------------
if __name__ == '__main__':
image_file = 't1.png'
width = 200
height = 200
line_width = 10
surface = cairo.ImageSurface(cairo.FORMAT_RGB24, width, height)
context = cairo.Context(surface)
context.set_line_width(line_width)
context.set_source_rgb(0xff, 0x99, 0)
context.rectangle(10, 10, 100, 100)
context.stroke()
surface.write_to_png(image_file)
1. Surface 毛釬月
2. Context 毛釬月
3. �及怮今毛偞隅
4. 伎毛偞隅
5. 侐褒及硌隅
6. 鏡賒
7. PNG 午仄化𤩸五堤仄

褣仄井勻凶仃升堤懂凶
? img2sixel 匹復庲
丐木ˋ佷勻化凶伎午綃丹
伎硌隅反苤杅分勻凶﹝
? context.set_source_rgb(0xff/0xff, 0x99/0xff, 0)

公木匹反午氾平旦玄毛袚樓
? 匹五凶!
context.set_font_size(font_size)
context.move_to(15, 35)
context.show_text("仇氏卞切反")
context.stroke()
1. 白巧件玄及湮五今毛偞隅
2. �垀毛硌隅
3. 恅趼蹈毛硌隅
4. 鏡賒

蜊謎萸毛𨈘�
? 淩侐褒分ㄐㄐ
? 午中丹仇午匹﹜引內反侳中澹毛鏡賒允月仇午毛醴硌允﹝

�午仿奶件毛瞎心磁歹六木壬堤懂公丹分
? 午中丹仇午匹𨈘坰

pycairo匹褒侳侐褒毛鏡賒允月
? 戊奈玉毛�質 x = 40
y = 50
w = 120
h = 100
r = 20
ctx.move_to(x+r, y)
ctx.line_to(x+w-r-1, y)
ctx.arc(x+w-r-1, y+r, r, -0.5*math.pi, 0)
ctx.line_to(x+w-1, y+h-r-1)
ctx.arc(x+w-r-1, y+h-r-1, r, 0, 0.5*math.pi)
ctx.line_to(x+r, y+h-1)
ctx.arc(x+r, y+h-r-1, r, 0.5*math.pi, math.pi)
ctx.line_to(x, y+r)
ctx.arc(x+r, y+r, r, math.pi, 1.5*math.pi)
ctx.close_path()
ctx.set_source_rgb(0xbb/float(0xff), 0xdd/float(0xff), 0xff/float(0xff))
ctx.fill_preserve()
ctx.set_source_rgb(0x11/float(0xff), 0x33/float(0xff), 0x77/float(0xff))
ctx.stroke()

巨仿奈
? math 互凶曰卅中
? import math 互斛猁
? 党淏仄化婬灍俴
? 匹五凶ㄐ
File "t3.py", line 22, in <module>
context.arc(x+w-r-1, y+r, r, -0.5*math.pi, 0)
NameError: name 'math' is not defined

伎毛赻煦及硌隅仄凶中伎卞允月
context.set_source_rgb(0xff/float(0xff), 0xff/float(0xff), 0xff/float(0xff))
context.fill_preserve()
context.set_source_rgb(0xff/float(0xff), 0x99/float(0xff), 0x00/float(0xff))
context.stroke()
�及笢及伎(#FFFFFF = WHITE)
�及伎(#FF9900 = ORANGE)

伎卞勾中化(Web 卅升匹方仁妏丹倛宒)
? #FF FF FF
喪 0‵255(16筳匹 0x00‵0xFF)
髮 0‵255(16筳匹 0x00‵0xFF)
ヤ 0‵255(16筳匹 0x00‵0xFF)
R G B

伎卞勾中化(踏隙及 cairo)
? 0~1.0 0~1.0 0~1.0
喪 0‵1.0
髮 0‵1.0
ヤ 0‵1.0
R G B
0xFF = 1.0
0x99 = 0.6
仇仇匹反晞皊奻 1.0 午中丹杅趼毛妏勻化中月互﹜衄�鳻反 32bit 腹�苤杅萸杅分井日 23bit

�及怮今毛劐尹月
line_width = 20

湮五今毛劐尹月
? surface 毛湮五仁允月
? w 毛 320 卞允月
width = 400
height = 200
surface = cairo.ImageSurface(cairo.FORMAT_RGB24, width, height)
x = 40
y = 50
w = 320
h = 100
r = 20

氾平旦玄手劐尹月
font_size = 30
context.set_source_rgb(0, 0, 0)
context.show_text("仇氏卞切反")
context.stroke()
伎毛𧃸卞
扔奶朮毛湮五仁
�垀毛羥絞卞

云引仃:白央奶伙靡及赻�汜傖
image_file = 'image_' + sys.argv[0].replace('.py',
'.png＊)
...
...
...
surface.write_to_png(image_file)
sys.argv[0] 卞反 t5.py 卅升及灍俴今木月 Python 及白央奶伙靡互⻌月
公仇匹﹜公及ゴ卞＆image_＊毛逋允
.py 毛 .png 尺 replace 允月﹝
允月午﹜ image_t5.png 午中丹恅趼蹈(string) 互堤懂月﹝
磐彆午仄化
$ python3 t5.py
午灍俴允月午
image_t5.png
互堤懂月

禾奶件玄
? 嬪勻凶ㄐㄐ
? 手勻午蜊囡匹五卅中井ˋ
𠸎葆中凶摽反
𨈘坰允月卅曰
�卞�仁卅曰允木壬中中

毛勾仁月
? �(arc) 毛鏡中化
? ※淩氏笢§卞 1 毛𤩸仁

毛勾仁月:楓俋�
? 統蕉引匹卞𤩸仁午 �卞1反虐噫甡湔恅趼匹允﹝
(勾引曰﹜丐引曰妏歹卅中源互方中ㄘ
? 賒砉卞允月煦卞反虐噫憝�S卅中ㄐ By 煢輿阨宴吽
�e卞煢輿阨宴吽互隅膽仄化中月晟䒑
匹反卅中互﹜卅兮井﹜𨈘坰匹甲永玄
仄凶及匹徭六化云仁

�毛鏡仁
r = 30
line_width = 3
context.arc(250, 88, r, 0, math.pi * 2)
context.stroke()
伎毛ヤ卞
圉噤互 30
�及怮今互3
�毛硌隅
鏡賒硌尨

arc 及玉平亙丟件玄(它尼皮扔奶玄)
https://pycairo.readthedocs.io 互掛模﹝公仇毛統桽允月
X 及弇离
Y 及弇离
圉噤
旦正奈玄及褒僅
巨件玉及褒僅

褒僅反 radians
1
2
羽
羽
3
2
羽
0 引凶反 2羽

掛絞反﹜﹜﹜剠癹卞由正奈件互丐月
＃ ?
3
2
羽 ,
1
2
羽,
5
2
羽,
9
2
羽＃
＃ ? 2羽 , 0,2 羽, 4 羽＃
＃ ?
1
2
羽 ,
3
2
羽,
7
2
羽,
11
2
羽＃
＃ ? 羽 , 羽, 3 羽, 5羽＃

皿伕弘仿丞匹反升丹卅勻化中凶井
context.arc(250, 88, r, 0, math.pi * 2)
旦正奈玄互ㄟ巨件玉互ㄡ羽
0 井日
2羽引匹
ㄟ井日 2羽引匹﹝允卅歹切360僅

毛勾仁月
? �(arc) 毛鏡中化 ↙ 絻傖
? ※淩氏笢§卞 1 毛𤩸仁
r = 30
line_width = 3
context.arc(250, 88, r, 0, math.pi *
2)
context.stroke()

釱㻢 x, y 毛肮元卞仄化1毛𤩸仁
font_size = 30
context.show_text('1')
context.stroke()
context.arc(250, 88, r, 0, math.pi *
2)
內木化引允ㄐㄐ

旦弗奈伙玉?白巧件玄午丟玄伉永弁
? 旦弗奈仿皮伙?白巧件玄(旦弗奈伙玉?白巧件玄)
? �湮?窺苤仄化手倛互推木卅中
? 白巧件玄?丟玄伉永弁
? 荂芃蚚惤
https://www.jfpi.or.jp/webyogo/index.php?term=3498

申永玄穴永皿白巧件玄VS旦弗奈仿皮伙白巧件玄
�湮允月午
卅戶日井匹卅仁卅月
�湮?窺苤仄化手
卅戶日井
睡嘟井﹜cairo 及 API 反 scaled_font 午中丹靡備
wikipedia 井日

白巧件玄?丟玄伉永弁
? 失伙白央矛永玄?白巧件玄恅趙及摩湮傖!!
https://docs.microsoft.com/ja-
jp/dotnet/desktop/winforms/advanced/how-to-obtain-
font-metrics?view=netframeworkdesktop-4.8

白巧件玄?丟玄伉永弁
? Arial
? Old English Text MT(掂戶氏!!)
? 脹盟白巧件玄(Courier New)
掂心支允中方丹卞 i 午井
反酘衵及諾啞互狫中
皿伕弘仿丞卞晞瞳卅方丹卞
盟互珨隅

脹盟vs皿伕禾奈扑亦瓜伙
脹盟分午恅趼及弇离互𠐓勻化中月
ˊ
�摩卞晞瞳
皿伕禾奈扑亦瓜伙分午恅趼及弇离反壬日壬日
ˊ
�摩卞祥晞(�凶醴反五木中)

cairo 及白巧件玄ロ�
extents = sf.text_extents('1＊)
print(extents)
python3 font-metric.py
cairo.TextExtents(
x_bearing=3.0,
y_bearing=-22.0,
width=9.0,
height=22.0,
x_advance=17.0,
y_advance=0.0)
API text_extents 毛妏丹
TextExtents 午中丹
左皮斥尼弁玄匹奪燴今木化中月

TextExtens 毛𤩸五煋氏分賒砉毛釬月

high 毛�湮
1) 旦正奈玄
釱㻢
2) 旦正奈玄釱㻢卞
x_bearing, y_bearing 毛
逋仄凶釱㻢
3) width
4) height
5) x_advance 6) y_advance 反未伕

1 毛�湮
笢陑毛А戶月
笢陑反仇仇

�及笢陑卞1毛⻌木月
x = 250
y = 88
str = '1'
font_size = 30
sf = scaled_font.get_scaled_font('Arial', font_size )
extents = sf.text_extents(str)
context.move_to(x, y)
context.rel_move_to(-extents.width/2, -extents.height/2)
context.rel_move_to(-extents.x_bearing, -extents.y_bearing)
context.show_text(str)
context.stroke()

丐午反巠絞卞弇离午伎毛覃淕

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