That leads to y=0 being a point somewhere above the bottom of the design space. Some letters, such as a lower case g or y, will have descenders that are still contained within the design space, but will have a negative value for their y-coordinate. The bottom of a roman capital letter is usually at the y=0 coordinate.
You can see an example of this in the image at the start of this post. The (0,0) point is typically located along the left edge of the box, though usually not at the bottom left corner. This number is a characteristic of the font and it’s included in the information in the font table. The space is given specific coordinates by dividing the EM box into a number of units per em. The box is called the design space and the coordinate system is called the design space coordinate system. The box around each glyph is 1em high and 1em wide. The geometric characteristics of different fonts are expressed within a coordinate system based on the EM box. There’s another coordinate system specific to fonts. The EM BoxĮarlier in the year I talked about the SVG coordinate system and I talked about there being different coordinate systems for the canvas on which your SVG is drawn and the viewport through which you see the canvas. Together the glyphs and font table are called font data. Font tables will also include information about things like the font weight. In addition to a collection of glyphs, a font includes a font table which contains information necessary to display the different glyphs in the collection such as the size to display a glyph and where the glyph should be positioned. For example there might be a single glyph for the ‘fi” pair. A font typically includes glyphs for the entire alphabet along with glyphs for numbers and it probably includes glyphs to represent ligatures. Glyphs drawn with a particular style will be collected together in a font, such as the Georgia or Helvetica. They would all be the same character, but each would be a different glyph.įonts are collections of glyphs. For example, the letter “f” can visually display with or without serifs or it can display in script. Glyphs are the visual representations of the characters. Each character is defined by specific unicode. SVG text is defined by a sequence of XML characters, which is why it can be searched for and selected. Characters, Glyphs, and Fontsīefore we get to the how let’s define a few things.Ĭharacters are the digital representation of the letters you want to display.
#Work font box series#
If you want to check out some of the other articles in the series to this point, you can find them all here.
#Work font box how to#
If you’re new to SVG, I recommend having a look at this article about how to work with SVG from the start of the year. For the next few weeks I’ll be talking again about scalable vector graphics and specifically how to work with SVG text. It’s been awhile since I last talked about SVG and I hope I haven’t kept you waiting too long for more. You can set it on a straight line, whether horizontal or vertical and you can even have the text follow a path of your own creation.
It can be read by screen readers and you can search for it in search engines. You can select it, copy it, and paste it elsewhere. It’s also packaged as XML character data, which means it’s real text. It’s rendered like other graphic elements so you can do things like add strokes and fills that you can add to shapes, lines, and arrowheads.
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