- From: Alan Gresley <alan@css-class.com>
- Date: Sun, 27 Nov 2011 22:18:24 +1100
- To: Daniel Glazman <daniel.glazman@disruptive-innovations.com>
- CC: www-style@w3.org
On 26/11/2011 8:11 PM, Daniel Glazman wrote: > Le 25/11/11 20:46, L. David Baron a écrit : > >> Does anything define what it means to be clockwise around an axis? >> Clockwise and counterclockwise make sense in terms of a plane and an >> observer on one side of that plane, but I don't know what they mean >> in terms of an axis. Can we use the right-hand rule instead? Or >> can we define that the relevant axis points from the plane to the >> observer or vice-versa? > > The latter. Defining ckw rotation around an axis is trivial: place an > observer on a plane orthogonal to that axis, looking towards positive > axis values; then rotate the plan clockwise for the observer around the > axis. > > </Daniel> Both rotate() and rotateZ() are synonyms. We have a box, ------------- | | | | | Z | | | | | ------------- which can be painted at any level in the z-index. Without any transforms (rotation) on the X and and Y axises or transform-origin, the box will turn clockwise on it axis (marked with the letter Z). This center axis point is on a plane (represented here as a box) which has it's central axis perpendicular to the plane of the observer. -- Alan Gresley http://css-3d.org/ http://css-class.com/
Received on Sunday, 27 November 2011 11:18:58 UTC