But the availability of this advice depends on the assignment that has been put into authoritative the font. While some fonts accommodate a lot of information, this isn’t consistently the case, abnormally not for chargeless or accessible antecedent fonts such as the ones from Google Fonts. But alike if advice is provided, it’s not necessarily constant or complete abundant to accomplish comparisons based on it.
So in adjustment to allocate and analyze typefaces myself, I had to booty a abutting attending at chantry files and acquisition automated means to abstract information. Fonts are accessible in a array of book formats, but eventually they are about consistently accessible as TTF (TrueType Fonts).
Other formats are OTF (OpenType) that includes advice for added appearance such as ligatures or WOFF (Web Accessible Chantry Format) that can abbreviate the chantry and abundance added meta data.
In the afterward area I will call how I abstinent contrast, x-height, amplitude and weight of all fonts provided in the Google Fonts Library. The aforementioned methods could be activated to added chantry libraries such as Typekit or fonts from your computer.
The adverse describes the arrangement of attenuate to blubbery strokes. There are typefaces with little achievement contrast, e.g. slab serifs or abounding sans serif typefaces advised for user interfaces, e.g. Roboto or San Francisco. There are others with a lot of contrast, such as Bodoni or Didot. To admeasurement the contrast, we can trace the outlines of an “o” and attending for the aboriginal and bigger distances amid close and alien shape.
It’s a simple and commensurable letter appearance that about consistently consists of two paths. It’s a acceptable applicant for ciphering the adverse of a typeface. (Side note: While acutely simple, the appearance of an “o” is absolutely absolutely adamantine to draw well, because the achievement needs to calmly abound and compress amid attenuate and thick.)
opentype.js provides acceptable means to get aisle abstracts to draw characters to a SVG element. I absolutely draw close and alien paths separately. Again I acclimated an algorithm that campaign forth anniversary aisle and measures the ambit at anniversary point. We can again annual the arrangement amid the longest and beeline ambit and voila — we accept a commensurable adverse measurement.
The x-height is an important appropriate that can be an indicator for accurateness and perceived admeasurement of a font. It is usually abstinent at the top of a lowercase x.
opentype.js provides us with the bare measurements, namely yMax for any glyph.
In accession to the complete measurement, it ability be advantageous to additionally analyze the x-height to the acme of the ascenders. Thus, we can get allotment ethics such as “the x-height is 60% of the uppercase letters”.
To accomplish the ethics commensurable (some fonts use 1000 unitsPerEm, others 2048 unitsPerEm), it is all-important to adapt the ethics and map them to a ambit of 0–1.
With this amount I try to butt how attenuated or advanced a chantry is. Is it rather abridged or extended? One abstraction I had was to admeasurement the amplitude of an “M”. But to accomplish those comparable, one would charge to put those into ambience of the all-embracing admeasurement or the x-height. Some typefaces additionally ability accept absolute appropriate “M” glyphs that don’t represent the blow of the typeface.
Another abstraction is to annual the boilerplate glyph amplitude application a sample chat like “Hamburgefontsiv”. While this works absolutely well, it additionally would charge some normalization in annual to the all-embracing architecture and acme of the typeface.
Another access is to attending at the admeasurement of an “o”. This gives suprisingly acceptable ethics for comparing the widths of fonts.
To admeasurement the weight, I cede the lowercase „o“ appearance to a HTML canvas element, ample it atramentous and acrylic the accomplishments white. I again admeasurement the arrangement amid atramentous and white pixels. A calligraphy or aerial chantry will appearance absolute little values, while a absolute abundant blocky chantry will appearance aerial values. This gave me okayish results, but I appetite to advance this by barometer absolute stems of glyphs in the future.
When all glyphs of a book accept the aforementioned width, they are alleged monospaced. Important actuality is, that we can’t necessarily attending a the glyphs themselves to actuate the width. Alike in a monospaced font, a dot appearance takes beneath arresting amplitude than a “m”. Thus, we charge to booty into annual the advanceWidth acreage that describes the airy amplitude about a glyph. Actuality we can acquisition out that Google Fonts uses monospaced as a appearance classification, but not to announce the abstruse property. Fonts such as Lekton or Libre Barcode are not listed as monospaced, but technically they are.
Once we accept a table of values, we can adapt those and again compute distances to see how agnate fonts are. I implemented a absolute basal adaptation of it that isn’t terrible, but could be bigger with college accurateness of the data. Also, we ability apperceive affinity altered than an algorithm that treats every appropriate equally. In that case, we ability charge to counterbalance some backdrop added than others.
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