Awesome
opentype.clj
A simple API over opentype.js for Clojure. Runs on the JVM.
Installation
Add [opentype-clj "0.8.0.1"] to your dependency vector.
Usage
(use 'opentype-clj.core)
(text "Roboto Black" ; font name
"Hello, World!" ; the text
0 ; Horizontal position of the beginning of the text. Default: 0
150 ; Vertical position of the baseline of the text. Default: 0
72) ; Size of text in pixels. Default: 72
=> {:path-data "M46.65 98.81L46.65 150L34.38 150L34.38 128.63L16.21 128.63L16.21 150L3.87 150L3.87 98.81L16.21 98.81L16.21 119.13L34.38 119.13L34.38 98.81L46.65 98.81ZM72.32 150.70L72.32 150.70L72.32 150.70Q67.68 150.70 64.02 149.23L64.02 149.23L64.02 149.23Q60.36 147.75 57.87 145.22L57.87 145.22L57.87 145.22Q55.37 142.69 54.05 139.35L54.05 139.35L54.05 139.35Q52.73 136.01 52.73 132.25L52.73 132.25L52.73 130.91L52.73 130.91Q52.73 126.76 53.88 123.16L53.88 123.16L53.88 123.16Q55.02 119.55 57.32 116.92L57.32 116.92L57.32 116.92Q59.63 114.28 63.05 112.77L63.05 112.77L63.05 112.77Q66.48 111.26 71.05 111.26L71.05 111.26L71.05 111.26Q75.09 111.26 78.31 112.56L78.31 112.56L78.31 112.56Q81.53 113.86 83.76 116.29L83.76 116.29L83.76 116.29Q85.99 118.71 87.17 122.16L87.17 122.16L87.17 122.16Q88.35 125.60 88.35 129.89L88.35 129.89L88.35 134.71L64.79 134.71L64.79 134.71Q65.43 137.91 67.57 139.73L67.57 139.73L67.57 139.73Q69.71 141.56 73.13 141.56L73.13 141.56L73.13 141.56Q75.55 141.56 77.89 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:bounding-box {:x1 3.8671875, :y1 96.0, :x2 413.40234375, :y2 163.78125},
:advance-width 416.49609375}
(text->path-data "Roboto Black" "Hello, World!" 0 150 72)
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285.66 121.22L285.66 121.22L285.66 121.22Q284.41 122.05 283.68 123.44L283.68 123.44L283.68 123.44Q282.94 124.83 282.62 126.69L282.62 126.69L282.62 126.69Q282.30 128.55 282.30 130.63L282.30 130.63ZM335.60 111.68L335.39 122.68L335.39 122.68Q335.04 122.65 334.53 122.60L334.53 122.60L334.53 122.60Q334.02 122.54 333.47 122.51L333.47 122.51L333.47 122.51Q332.93 122.47 332.40 122.44L332.40 122.44L332.40 122.44Q331.88 122.40 331.49 122.40L331.49 122.40L331.49 122.40Q328.64 122.40 326.88 123.26L326.88 123.26L326.88 123.26Q325.13 124.13 324.32 125.92L324.32 125.92L324.32 150L312.47 150L312.47 111.96L323.58 111.96L323.96 116.85L323.96 116.85Q325.37 114.21 327.46 112.73L327.46 112.73L327.46 112.73Q329.55 111.26 332.30 111.26L332.30 111.26L332.30 111.26Q333.18 111.26 334.04 111.36L334.04 111.36L334.04 111.36Q334.90 111.47 335.60 111.68L335.60 111.68ZM352.16 96L352.16 150L340.28 150L340.28 96L352.16 96ZM357.96 131.44L357.96 130.70L357.96 130.70Q357.96 126.38 358.91 122.79L358.91 122.79L358.91 122.79Q359.86 119.20 361.72 116.64L361.72 116.64L361.72 116.64Q363.59 114.07 366.35 112.66L366.35 112.66L366.35 112.66Q369.11 111.26 372.76 111.26L372.76 111.26L372.76 111.26Q375.47 111.26 377.58 112.31L377.58 112.31L377.58 112.31Q379.69 113.37 381.34 115.27L381.34 115.27L381.34 96L393.22 96L393.22 150L382.57 150L381.97 145.92L381.97 145.92Q380.29 148.14 378 149.42L378 149.42L378 149.42Q375.71 150.70 372.69 150.70L372.69 150.70L372.69 150.70Q369.07 150.70 366.33 149.24L366.33 149.24L366.33 149.24Q363.59 147.79 361.72 145.22L361.72 145.22L361.72 145.22Q359.86 142.65 358.91 139.12L358.91 139.12L358.91 139.12Q357.96 135.59 357.96 131.44L357.96 131.44ZM369.81 130.70L369.81 131.44L369.81 131.44Q369.81 133.58 370.09 135.43L370.09 135.43L370.09 135.43Q370.37 137.27 371.06 138.64L371.06 138.64L371.06 138.64Q371.74 140.02 372.88 140.79L372.88 140.79L372.88 140.79Q374.03 141.56 375.71 141.56L375.71 141.56L375.71 141.56Q377.72 141.56 379.13 140.70L379.13 140.70L379.13 140.70Q380.53 139.84 381.34 138.26L381.34 138.26L381.34 123.77L381.34 123.77Q379.72 120.40 375.79 120.40L375.79 120.40L375.79 120.40Q374.13 120.40 372.99 121.17L372.99 121.17L372.99 121.17Q371.85 121.95 371.14 123.33L371.14 123.33L371.14 123.33Q370.44 124.72 370.13 126.60L370.13 126.60L370.13 126.60Q369.81 128.48 369.81 130.70L369.81 130.70ZM413.23 98.81L411.71 133.79L402.12 133.79L400.61 98.81L413.23 98.81ZM400.25 144.69L400.25 144.69L400.25 144.69Q400.25 143.43 400.73 142.34L400.73 142.34L400.73 142.34Q401.20 141.25 402.08 140.46L402.08 140.46L402.08 140.46Q402.96 139.66 404.16 139.21L404.16 139.21L404.16 139.21Q405.35 138.75 406.83 138.75L406.83 138.75L406.83 138.75Q408.30 138.75 409.50 139.21L409.50 139.21L409.50 139.21Q410.70 139.66 411.57 140.46L411.57 140.46L411.57 140.46Q412.45 141.25 412.93 142.34L412.93 142.34L412.93 142.34Q413.40 143.43 413.40 144.69L413.40 144.69L413.40 144.69Q413.40 145.96 412.93 147.05L412.93 147.05L412.93 147.05Q412.45 148.14 411.57 148.93L411.57 148.93L411.57 148.93Q410.70 149.72 409.50 150.18L409.50 150.18L409.50 150.18Q408.30 150.63 406.83 150.63L406.83 150.63L406.83 150.63Q405.35 150.63 404.16 150.18L404.16 150.18L404.16 150.18Q402.96 149.72 402.08 148.93L402.08 148.93L402.08 148.93Q401.20 148.14 400.73 147.05L400.73 147.05L400.73 147.05Q400.25 145.96 400.25 144.69Z"
(text->bounding-box "Roboto Black" "Hello, World!" 0 150 72)
=> {:x1 3.8671875, :y1 96.0, :x2 413.40234375, :y2 163.78125}
(font "Roboto Black")
=> #opentype_clj.wrapper.Font{:name "Roboto Black",
:resource "fonts/Roboto-Black.ttf", ; actual resource used to load this font
:units-per-em 2048,
:ascender 1900,
:descender -500,
:font-obj #object[opentype_clj.bootstrap$load_font_stream$fn__15394$fn__15395
0xe6f99a3
"opentype_clj.bootstrap$load_font_stream$fn__15394$fn__15395@e6f99a3"]}
; a slightly more complex example:
(let [txt (text "Roboto Black" "Hello, World!" 10 100 72)
svg (str "<svg width='450' height='150' xmlns='http://www.w3.org/2000/svg'>\n"
"<path fill='black' stroke='none' d='" (:path-data txt) "' />\n"
"<path fill='none' stroke='red' d='" (bounding-box->path-data (:bounding-box txt)) "' />\n"
"</svg>\n")]
(spit "bounding-box.svg" svg))
; will produce the image below:
Determining font resource from a string
Most functions in opentype-clj.core takes a string font name as an input parameter.
This string is matched to a file or classpath resource by trying font name.[|ttf|woff|otf]
as well as font-name.[|ttf|woff|otf]. So for example Roboto Black will have the following resource candidates:
(use 'opentype-clj.font-cache)
(font-name->resource-candidates "Roboto Black")
=> ["Roboto Black" "Roboto Black.ttf" "Roboto Black.woff" "Roboto Black.otf" "fonts/Roboto Black.ttf"
"fonts/Roboto Black.woff" "fonts/Roboto Black.otf" "Roboto-Black" "Roboto-Black.ttf" "Roboto-Black.woff"
"Roboto-Black.otf" "fonts/Roboto-Black.ttf" "fonts/Roboto-Black.woff" "fonts/Roboto-Black.otf"]
The first successful match will be used.
In the case of this project, Roboto Black will ultimately resolve to fonts/Roboto-Black.ttf.
Details
Uses opentype.js v0.8.0.
Loading a font is somewhat expensive (about 250 ms on my machine), so they are cached by the library.
License
Original license from opentype.js:
The MIT License (MIT)
Copyright (c) 2017 Frederik De Bleser
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Please also see AUTHORS of opentype.js.
Copyright © 2018 Ivar Refsdal
Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version.