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Refine DPI docs

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Osspial 2020-01-05 16:34:37 -05:00
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src/dpi.rs
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@ -28,14 +28,10 @@
//! for example, a button that's normally 50 pixels across would be 100 pixels across on a device
//! with a scale factor of `2.0`, or 75 pixels across with a scale factor of `1.5`.
//!
//! The scale factor correlates with, but no has direct relationship to, the screen's actual DPI
//! (dots per inch). Operating systems used to define the scale factor in terms of the screen's
//! approximate DPI (at the time, 72 pixels per inch), but [Microsoft decided to report that the DPI
//! was roughly 1/3 bigger than the screen's actual DPI (so, 96 pixels per inch) in order to make
//! text more legible][microsoft_dpi]. As a result, the exact DPI as defined by the OS doesn't carry
//! a whole lot of weight when designing cross-platform UIs. Scaled pixels should generally be used
//! as the base unit for on-screen UI measurement, instead of DPI-dependent units such as
//! [points][points] or [picas][picas].
//! Many UI systems, such as CSS, expose DPI-dependent units like [points] or [picas]. That's
//! usually a mistake, since there's no consistent mapping between the scale factor and the screen's
//! actual DPI. Unless you're printing to a physical medium, you should work in scaled pixels rather
//! than any DPI-dependent units.
//!
//! ### Position and Size types
//!
@ -94,7 +90,6 @@
//! device, and range from `1.0` to `4.0`. See [this article][android_1] for more information.
//! - **Web:** The scale factor is the ratio between CSS pixels and the physical device pixels.
//!
//! [microsoft_dpi]: https://blogs.msdn.microsoft.com/fontblog/2005/11/08/where-does-96-dpi-come-from-in-windows/
//! [points]: https://en.wikipedia.org/wiki/Point_(typography)
//! [picas]: https://en.wikipedia.org/wiki/Pica_(typography)
//! [windows_1]: https://docs.microsoft.com/en-us/windows/win32/hidpi/high-dpi-desktop-application-development-on-windows