https://wiki.inkscape.org/wiki/api.php?action=feedcontributions&feedformat=atom&user=Od4Btx 2026-04-25T10:48:16Z User contributions MediaWiki 1.36.1 https://wiki.inkscape.org/wiki/index.php?title=PathEstimation&diff=14109 2007-04-11T11:28:50Z

<p>Od4Btx: </p> <hr /> <div>This feature discusses two utility functions that would be central to any Inkscape user's workflow.<br /> The ability to outline a selected path or shape, along with offsetting those same shapes provides a simple way for illustrators to edit and create new art very rapidly.<br /> <br /> * Outline Stroke<br /> <br /> We begin with a simple path containing a single corner, and a single curve.<br /> <br /> http://www.inkscape.org/magnethead/sample_path/01_basepath.jpg<br /> <br /> Then we select a stroke for this path: 32 pixels here.<br /> <br /> http://www.inkscape.org/magnethead/sample_path/02_strokedpath.jpg<br /> <br /> Choosing a menu item &quot;Outline Stroke&quot; results in a new filled shape ( filled with the previous stroke color ) representing the path visually using a bezier shape.<br /> <br /> http://www.inkscape.org/magnethead/sample_path/03_outlinedpath.jpg<br /> <br /> Here we can see the new path with a stroke of black and a fill of white.<br /> <br /> http://www.inkscape.org/magnethead/sample_path/04_outlinedpath_withstroke.jpg<br /> <br /> <br /> * Offset Path<br /> <br /> Offsetting a path works much like a centrally anchored scale operation, except it will scale away from the control nodes that the base shape is made of.<br /> Here we show an offset of -5, making a smaller path within the existing shape. ( Using a simple scale would have caused overlap )<br /> <br /> http://www.inkscape.org/magnethead/sample_path/05_offsetpath_minus5.jpg<br /> <br /> * Is there a well-known algorithm for offsetting arbitrary shapes? If not, I've played a bit with beziers in KSEG [http://www.mit.edu/~ibaran/kseg.html] and I think I found an algorithm that offsets an arbitrary convex bezier acceptably well. If anyone is interested I can post details. -- bb<br /> <br /> Here we show the result of attempting a simple scale to achieve this effect:<br /> <br /> http://www.inkscape.org/magnethead/sample_path/05.5_offsetpath_scalebotch.jpg<br /> <br /> And here we show an offset path of 5, making a larger shape.<br /> <br /> http://www.inkscape.org/magnethead/sample_path/06_offsetpath_plus5.jpg<br /> <br /> *I'd be interested in any code or algorithms that show how to create a bezier path that is offset from another bezier path by an arbitrary amount. TIA. -- gwk<br /> <br /> [[Category:Wiki Attic]]</div>

Od4Btx