Twip
A twip (abbreviating "twentieth of a point", "twentieth of an inch point",[1] or "twentieth of an Imperial point"[citation needed]) is a typographical measurement, defined as 1⁄20 of a typographical point. One twip is 1⁄1440 inch, or 17.64 μm.[2]
In computing
Twips are screen-independent units to ensure that the proportion of screen elements are the same on all display systems. A twip is defined as being 1⁄1440 of an inch (approximately 17.64 μm).
A pixel is a screen-dependent unit, standing for 'picture element'. A pixel is a dot that represents the smallest graphical measurement on a screen. Twips are the default unit of measurement in Visual Basic (version 6 and earlier, prior to VB.NET). Converting between twips and screen pixels is achieved using the TwipsPerPixelX and TwipsPerPixelY properties[3] or the ScaleX and ScaleY methods.[4]
Twips can be used with Symbian OS bitmap images for automatic scaling from bitmap pixels to device pixels.[5] They are also used in Rich Text Format from Microsoft for platform-independent exchange and they are the base length unit in OpenOffice.org and its fork LibreOffice.
Flash internally specifies most sizes in units it calls twips, but which are really 1⁄20 of a logical pixel,[6] which is 3⁄4 of an actual twip.[7]
See also
References
- ↑ The Free On-line Dictionary of Computing: http://foldoc.org/twip
- ↑ "Word 2007: Rich Text Format (RTF) Specification, version 1.9.1". Microsoft Corporation.. 19 March 2008. p. 8. https://www.microsoft.com/en-us/download/details.aspx?id=10725.
- ↑ "TwipsPerPixelX, TwipsPerPixelY Properties". 23 August 2006. https://docs.microsoft.com/en-us/previous-versions/visualstudio/visual-basic-6/aa445741(v=vs.60).
- ↑ "ScaleX, ScaleY Methods". 23 August 2006. https://docs.microsoft.com/en-us/previous-versions/visualstudio/visual-basic-6/aa244168(v=vs.60).
- ↑ Dueder, Janelle (December 20, 2020). "Blitting and bitmaps - Symbian OS C++". https://www.25yearsofprogramming.com/c-2/blitting-and-bitmaps.html.
- ↑ https://web.archive.org/web/20161120220314/adobe.com/content/dam/Adobe/en/devnet/swf/pdf/swf-file-format-spec.pdf[bare URL PDF]
- ↑ Flash logical pixels are the same as HTML logical pixels, of which there are 96 to an inch, rather than 72: https://developer.mozilla.org/en-US/docs/Glossary/CSS_pixel
- Sparke, Gerard; Etherington, Stephen (2000). Visual Basic Programmers' Workbook. Pearson Education Australia. ISBN 978-1-74009-445-0.
- MSDN Library — com.ms.wfc.ui.CoordinateSystem.TWIP
- Free On-Line Dictionary of Computing — twip
- Foundation, ActionScript 3.0 Animation, Making Things Move! by Keith Peters ISBN:978-1-59059-791-0 (pbk)
- Converting between twips and pixels - Ruby code
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