File talk:2D affine transformation matrix.svg

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Currently I spent lots of time studying 2D transformations and programming some stuff connected to it. It seems like there is a little bit confusion connected to transformation called shearing in the world. Several sources use this term just to name a transformation that changes angles but keeps parallels [[1], [2], [3], [4]…]. Shearing is expressed there by some kind of distance between points, not using angle.

It seems like expressing the same thing using an angle is called skewing [[5], [6], [7], [8]…] and this term is mostly used in the area of web graphics (like SVG, CSS…). Yes, I know that the result of tangent function is a kind of “distance” computed from the angle. I did not want to point on some mistake on the image, no, according the facts there is no mistake on the image. But I would be happy if this small difference in terminology could be referred somehow here… (I would like to leave the decision about the best way of how to do it on the author of the image.)

Thank you… :-)

Roman Horváth (talk) 01:39, 23 July 2016 (UTC)[reply]

  1. ^ Weisstein, Eric W.: “Shear.” MathWorld – A Wolfram Web Resource, 1999–2016. http://mathworld.wolfram.com/Shear.html. Accessed 23 July 2016.
  2. ^ Weisstein, Eric W.: “Shear Matrix.” MathWorld – A Wolfram Web Resource, 1999–2016. http://mathworld.wolfram.com/ShearMatrix.html. Accessed 23 July 2016.
  3. ^ Bogomolny, Alexander: “What Is Shear Transform?” Interactive Mathematics Miscellany and Puzzles, 1996–2016. http://www.cut-the-knot.org/WhatIs/WhatIsShearTransform.shtml. Accessed 23 July 2016.
  4. ^ Foley – Van Dam: “Chapter 5 – 2D Geometrical Transformations.” http://www.cs.brandeis.edu/~cs155/Lecture_06.pdf. Accessed 23 July 2016.
  5. ^ Users of StackOwerflow: “Skew matrix algorithm.” StackOwerflow, 2011. http://stackoverflow.com/questions/673216/skew-matrix-algorithm. Accessed 23 July 2016.
  6. ^ Team of authors: “Coordinate Systems, Transformations and Units – SVG 1.1 (Second Edition).” W3C, 2011. https://www.w3.org/TR/SVG11/coords.html. Accessed 23 July 2016.
  7. ^ Vila, Joaquin – Beccue, Barbara: “Transformation – Scaling & Skew.” Illinois State University, 2002 or later. http://www.itk.ilstu.edu/faculty/javila/SVG/SVG_Drawing2/scale.htm. Accessed 23 July 2016.
  8. ^ GitHub User heygrady: “Calculating 2D Matrices.” GitHub, 2010. https://github.com/heygrady/transform/wiki/Calculating-2d-Matrices. Accessed 23 July 2016.
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