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## Re: [Inkscape-devel] recognizing rectangles, lines, etc. in 2geom, like "isrect()"???

 Re: [Inkscape-devel] recognizing rectangles, lines, etc. in 2geom, like "isrect()"??? From: Nathan Hurst - 2013-12-21 00:30:14 Hi David, On Fri, Dec 20, 2013 at 02:55:00PM -0800, mathog wrote: > In the patch for bug 1263242 here > > https://bugs.launchpad.net/inkscape/+bug/1263242 I can't work out how to get to your patch from this link. > these 3 functions were added to emf-print.cpp. > > Geom::Path pathv_to_simple_polygon(Geom::PathVector const &pathv, > int *vertices); > Geom::Path pathv_to_rect(Geom::PathVector const &pathv, bool > *is_rect, double *angle); > Geom::Point get_pathrect_corner(Geom::Path pathRect, double angle, > int corner); > > The first function returns a path in which any points on a polygonal > path (stored in a PathVector) that are not at a vertex have been > eliminated. It also eliminates one point where two fall within epsilon > of each other. (Duplicate points, not sure what the technical > term for them is.) If the pathvector holds more than one path or has > any curves that are not linear then it returns an empty path. This name is not quite ideal, a simple polygon is one which also has no self intersections, something you don't guarantee. Perhaps describe what it does: remove_superfluous_vertices ? > The second analyzes a PathVector to see if it is a rectangle. It does > this by first calling > the preceding function, then checking that the path has 4 sides and that > each side is 90 degrees from its two neighbors. If that is the case > is_rect comes back true. The angle returned is that of the minimal > rotation that will align the sides of the rectangle with the X and Y > axes. Sounds good, definitely could go in 2geom. > The third returns the coordinates of the Upper Left, Upper Right, Lower > Right, and Lower Left corners of the rectangle, as determined by the > value of "corner", given the rotation angle and path returned by the > preceding function. You might construct this using the Rect::corner function combined with multiplication by a rotation. njh